{"id":8637,"date":"2026-11-09T09:37:48","date_gmt":"2026-11-09T09:37:48","guid":{"rendered":"https:\/\/korea-transmission.com\/?post_type=product&p=8637"},"modified":"2026-11-10T05:26:52","modified_gmt":"2026-11-10T05:26:52","slug":"tl-312a-flail-mower-gearbox-ratio-11-6-replacement-for-comer-tl-312a-gearbox","status":"publish","type":"product","link":"https:\/\/korea-transmission.com\/ja\/product\/tl-312a-flail-mower-gearbox-ratio-11-6-replacement-for-comer-tl-312a-gearbox\/","title":{"rendered":"TL-312A\u30d5\u30ec\u30a4\u30eb\u30e2\u30a2\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9 \u30ae\u30a2\u6bd4 1:1.6 Comer TL-312A\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\u306e\u4ea4\u63db\u90e8\u54c1"},"content":{"rendered":"

The TL-312A Flail Mower Gearbox Ratio 1:1.6 serves as a direct Replacement for Comer TL-312A Gearbox, engineered to transfer up to 76.5 kW of tractor PTO power into 443 Nm of output torque for reliable vegetation cutting. This agricultural flail mower gearbox features a speed-increasing 21\/22-tooth gear set housed inside a GG25 cast iron shell, providing the structural stiffness needed to withstand continuous shock loads from flail impacts against rocks, stumps, and compacted soil. Both input and output connections use the standard 1″3\/8 Z-6 splined profile, allowing operators to bolt this unit onto most tractor flail mower frames without modifying the driveline or mounting brackets. At only 27 kg, the gearbox keeps overall machine weight manageable while still delivering heavy duty flail mower gearbox durability for season-after-season operation.<\/p>\n

Whether you manage large-scale pasture maintenance, roadside verge mowing, orchard floor clearing, or brush control on rough terrain, this flail mower PTO gearbox converts high-speed 1000 RPM rotation into the lower drum RPM and higher torque that flail rotors require. The 1.5-liter oil reservoir, filled with SAE 80W-90 gear lubricant, keeps internal components cool during extended work sessions. First oil service is recommended at 50 to 70 hours, then every 500 hours or annually, whichever comes first. Designed as a Comer flail mower gearbox replacement, this gearbox assembly delivers equivalent performance at a fraction of the OEM cost, backed by CMN Transmission’s global after-sales support network.<\/p>\n

\"TL-312A<\/p>\n

\u6280\u8853\u4ed5\u69d8<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u30e2\u30c7\u30eb<\/strong><\/td>\nTL-312A\u00a0 Flail Mower Gearbox 1:1.6<\/td>\n<\/tr>\n
\u4ea4\u63db\u30d6\u30e9\u30f3\u30c9<\/strong><\/td>\n\u30b3\u30de\u30fc<\/td>\n<\/tr>\n
\u5546\u54c1\u8a73\u7d30<\/strong><\/td>\n\n
    \n
  • All gearboxes are supplied without oil.<\/li>\n
  • First oil change after 50-70 operating hours, then after 500-700 operating hours or at least once a year.<\/li>\n
  • Contact us for power at a different RPM.<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
\u9069\u7528\u7bc4\u56f2<\/strong><\/td>\n\n
    \n
  • Various (agricultural) applications<\/li>\n
  • Flail Mowers<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
\u6bd4\u7387\u00a0<\/strong><\/td>\n1:1.6<\/td>\n<\/tr>\n
\u63a5\u7d9a1 \u5916\u5f84\u30a4\u30f3\u30c1\u3068\u30b9\u30d7\u30e9\u30a4\u30f3<\/strong><\/td>\n1″3\/8 Z-6<\/td>\n<\/tr>\n
\u63a5\u7d9a\u90e82 \u5916\u5f84\u30a4\u30f3\u30c1\u3068\u30b9\u30d7\u30e9\u30a4\u30f3<\/strong><\/td>\n1″3\/8 Z-6<\/td>\n<\/tr>\n
\u6700\u5927\u5165\u529b\u96fb\u529b<\/strong><\/td>\n76.5 kW<\/td>\n<\/tr>\n
\u6700\u5927\u5165\u529b\u56de\u8ee2\u901f\u5ea6<\/strong><\/td>\n1000\u56de\u8ee2\/\u5206<\/td>\n<\/tr>\n
\u6700\u5927\u51fa\u529b\u96fb\u529b<\/strong><\/td>\n76.5 kW<\/td>\n<\/tr>\n
\u6700\u5927\u51fa\u529b\u96fb\u529b<\/strong><\/td>\n104 HP<\/td>\n<\/tr>\n
\u6700\u5927\u51fa\u529b\u30c8\u30eb\u30af<\/strong><\/td>\n443 N\u00b7m<\/td>\n<\/tr>\n
\u30ae\u30a2\u914d\u7f6e\u5897\u52a0<\/strong><\/td>\n21-22<\/td>\n<\/tr>\n
\u30aa\u30a4\u30eb\u542b\u6709<\/strong><\/td>\n\u3044\u3044\u3048<\/td>\n<\/tr>\n
\u6700\u5927\u30aa\u30a4\u30eb\u5bb9\u91cf<\/strong><\/td>\n1.5 L<\/td>\n<\/tr>\n
\u6700\u5927\u30aa\u30a4\u30eb\u4ea4\u63db\u9593\u9694<\/strong><\/td>\n500\u6642\u9593<\/td>\n<\/tr>\n
\u30aa\u30a4\u30eb\u306eSAE\u7c98\u5ea6\u30b0\u30ec\u30fc\u30c9<\/strong><\/td>\n80W-90<\/td>\n<\/tr>\n
\u30cf\u30a6\u30b8\u30f3\u30b0\u6750<\/strong><\/td>\n\u92f3\u9244\u88fdGG25<\/td>\n<\/tr>\n
\u91cd\u3055<\/strong><\/td>\n27 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5f53\u793e\u306f\u3001SGS\/T\u00dcV\u30e9\u30a4\u30f3\u30e9\u30f3\u30c9\u306e\u652f\u63f4\u3092\u53d7\u3051\u305f\u7b2c\u4e09\u8005\u6a5f\u95a2\u306b\u3088\u308b\u30b5\u30d7\u30e9\u30a4\u30e4\u30fc\u76e3\u67fb\u304a\u3088\u3073\u4f01\u696d\u691c\u8a3c\u3092\u5b8c\u4e86\u3057\u307e\u3057\u305f\u3002\u3053\u306e\u691c\u8a3c\u306b\u3088\u308a\u3001\u8cfc\u5165\u8005\u306f\u4f01\u696d\u306e\u8eab\u5143\u3001\u4e8b\u696d\u904b\u55b6\u3001\u30b5\u30d7\u30e9\u30a4\u30e4\u30fc\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u3001\u304a\u3088\u3073\u4e00\u822c\u7684\u306a\u88fd\u9020\u80fd\u529b\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u88fd\u54c1\u56fa\u6709\u306e\u691c\u67fb\u5831\u544a\u66f8\u3001\u8cc7\u6750\u6587\u66f8\u3001\u307e\u305f\u306f\u30b3\u30f3\u30d7\u30e9\u30a4\u30a2\u30f3\u30b9\u8a18\u9332\u306f\u3001\u6ce8\u6587\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u63d0\u4f9b\u53ef\u80fd\u3067\u3059\u3002<\/p>\n

\u6700\u5c0f\u6ce8\u6587\u6570\u91cf\uff08MOQ\uff09\uff1a<\/strong>\u00a0\u88fd\u54c1\u306e\u7a2e\u985e\u3068\u6ce8\u6587\u6570\u91cf\u306b\u57fa\u3065\u3044\u3066\u67d4\u8edf\u306b\u8a2d\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u30b5\u30f3\u30d7\u30eb\uff1a<\/strong>\u00a0\u65b0\u898f\u306e\u304a\u5ba2\u69d8\u306f\u3001\u9069\u5207\u306a\u72b6\u6cc1\u4e0b\u3067\u3042\u308c\u3070\u30011\uff5e5\u500b\u306e\u30b5\u30f3\u30d7\u30eb\u3092\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u304d\u307e\u3059\u3002<\/p>\n

\u6df7\u5408\u6ce8\u6587\uff1a<\/strong>\u00a0\u7570\u306a\u308b\u30e2\u30c7\u30eb\u306e\u7d44\u307f\u5408\u308f\u305b\u3082\u53ef\u80fd\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u5408\u8a08\u6ce8\u6587\u91d1\u984d\u306f\u7d04$1,500\u306b\u9054\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n

\u5c0f\u53e3\u6ce8\u6587\uff1a<\/strong>\u00a01\uff5e2\u500b\u304b\u3089\u306e\u3054\u6ce8\u6587\u3082\u627f\u308a\u307e\u3059\u304c\u3001\u5358\u4fa1\u306f\u3084\u3084\u9ad8\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n

\u30ea\u30fc\u30c9\u30bf\u30a4\u30e0\uff1a<\/strong>\u00a0\u6a19\u6e96\u90e8\u54c1\u306e\u5834\u5408\u306f10\uff5e25\u55b6\u696d\u65e5\u3001\u7279\u6ce8\u90e8\u54c1\u306e\u5834\u5408\u306f20\uff5e45\u55b6\u696d\u65e5\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u30d9\u30fc\u30b9\u306e\u6a5f\u5668\u306e\u5834\u5408\u306f45\uff5e120\u55b6\u696d\u65e5\u3002<\/p>\n

\u53d6\u5f15\u6761\u4ef6\uff1a<\/strong>\u00a0EXW\u3001FOB\u3001CIF\u3001DAP\u306f\u4e00\u822c\u7684\u306b\u5bfe\u5fdc\u53ef\u80fd\u3067\u3059\u304c\u3001FCA\u3001CFR\u3001CPT\u3001CIP\u3001DDP\u306e\u6761\u4ef6\u306b\u3064\u3044\u3066\u306f\u500b\u5225\u306b\u4ea4\u6e09\u53ef\u80fd\u3067\u3059\u3002<\/p>\n

TL-312A Flail Mower Gearbox Dimensions<\/h2>\n

\"TL-312A \"TL-312A<\/p>\n

Key Features of the TL-312A Flail Mower Gearbox<\/h2>\n

1. Power Transmission and Speed Conversion
\nThis tractor flail mower gearbox converts high-speed 1000 RPM input from the PTO shaft into a proportionally adjusted 1600 RPM output at higher torque, delivering 443 Nm to the flail rotor drum. The 21\/22-tooth speed-increasing gear arrangement keeps rotor velocity consistent even under fluctuating field loads, whether chopping thick grass, dense weeds, or crop residues. This steady torque supply prevents flail stalling and maintains uniform cut quality across uneven terrain.<\/p>\n

2. Durability and Heavy-Duty Protection
\nConstructed with a GG25 cast iron housing, this heavy duty flail mower gearbox resists cracking and deformation from repeated impacts. The thick-walled casing shields internal gears, shafts, and bearings from dust ingress, plant fiber wrap, and stone strikes that are common during roadside or pasture mowing. A corrosion-resistant surface coating prolongs service life in humid, dew-heavy, or coastal working environments where steel housings would rust rapidly.<\/p>\n

3. Sealing and Corrosion Resistance
\nReinforced flail mower gearbox oil seals at both the input and output shaft interfaces block moisture, fine soil particles, and chopped vegetation from entering the oil cavity. These seals work alongside precision-machined gasket surfaces on the housing halves to retain the full 1.5 liters of SAE 80W-90 lubricant under operating temperatures and vibration. The result is extended bearing service intervals and consistent lubrication film thickness on every gear tooth surface throughout the working season.<\/p>\n

4. Flexible Ratio Options and Modular Output
\nThe TL-312A platform offers multiple flail mower gearbox<\/strong><\/a> ratio variants, including 1:1.6, 1:1.93, and 1:3, giving equipment builders the flexibility to match drum speed to specific knife configurations and cutting applications. The 1″3\/8 Z-6 splined output adapts to a wide range of flail drum hubs and coupling systems, so one gearbox family covers compact 3 point flail mower setups as well as full-width commercial units on offset mowing arms.<\/p>\n

5. Safety and Overload Protection
\nWhen flails jam on large obstacles or buried debris, excessive torque spikes can travel back through the driveline and crack gearbox housings or twist input shafts. The TL-312A platform is compatible with external slip clutches, shear bolts, and torque-limiting couplings that interrupt torque flow before the gearbox reaches its structural limit. This overload protection design safeguards internal components and prevents costly driveline damage that would leave operators idle during peak mowing season.<\/p>\n

6. Drop-In Comer Replacement Compatibility
\nManufactured to match the original Comer TL-312A mounting dimensions, bolt patterns, and shaft profiles, this flail mower gearbox replacement bolts directly onto existing frames without drilling new holes or fabricating adapter plates. Every spline count, flange diameter, and fastener position mirrors the OEM geometry, so technicians can complete the swap in a single service stop. This drop-in fit makes it equally suitable as a replacement for Comer T-310A flail mower gearbox setups with the appropriate extension shaft.<\/p>\n

\"\u30d5\u30ec\u30a4\u30eb\u30e2\u30a2\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\"<\/p>\n

\u52d5\u4f5c\u539f\u7406<\/h2>\n

Flail mower gearboxes are fundamental power transmission components in agricultural and municipal mowing equipment. They receive rotational energy from the tractor’s Power Take-Off (commonly rated at 540 RPM or 1000 RPM) and redirect it through a set of precisely machined gears to the flail rotor drum. In the TL-312A, the input shaft carries a 21-tooth pinion gear that meshes with a 22-tooth driven gear on the output shaft, creating a 1:1.6 speed-increasing ratio. This means the 1000 RPM input is multiplied to approximately 1600 RPM at the output, while torque is distributed proportionally to deliver 443 Nm to the cutting drum.<\/p>\n

Inside the gearbox housing, the flail mower right angle gearbox configuration changes the axis of rotation by 90 degrees, redirecting power from the horizontally oriented PTO driveline shaft downward (or laterally, depending on the mower design) to the flail drum shaft. The gears themselves are case-hardened steel components ground to tight tolerances, which keeps noise levels down while providing the tooth strength needed to absorb transient shock loads. Each gear tooth engages its counterpart along an involute profile, maintaining a constant velocity ratio and minimizing vibration at the bearings.<\/p>\n

The flail mower gearbox bearings support both the input and output shafts at their housing bore locations, carrying radial loads from gear tooth forces and axial thrust from helical or bevel gear contact angles. Tapered roller bearings or deep groove ball bearings are selected based on the load direction and magnitude at each position. These bearings operate within a bath of SAE 80W-90 gear oil that coats every contact surface through a combination of splash lubrication from the rotating gears and oil channeling features cast into the housing walls.<\/p>\n

When the tractor operator engages the PTO clutch, rotational power travels through the PTO driveline shaft, through the universal joints, and into the gearbox input shaft spline. The input pinion begins turning its mating gear, and within seconds the flail drum spins up to operating speed. The flails, which are individual hardened-steel blades attached to the drum by swing mounts, fan outward under centrifugal force and begin cutting vegetation on contact. Because each flail pivots independently, hitting a stone or stump causes that single flail to swing back rather than transferring the full impact force through the drum and into the gearbox.<\/p>\n

Under steady mowing conditions, the gearbox maintains a consistent flail mower gearbox ratio of 1:1.6, delivering uniform rotor speed regardless of whether the material being cut is soft grass, dense brush, or dry crop stubble. When the cutting load increases temporarily, the engine governor responds by feeding more fuel, and the gearbox transmits the additional torque to the drum without any belt slippage or chain stretch that can occur in other drive systems. This direct mechanical link provides the reliable power delivery that professional mowing operations depend on.<\/p>\n

\"Flail<\/p>\n

Applications of the TL-312A Flail Mower Gearbox<\/h2>\n
\n

1. Vegetation Shredding and Pasture Maintenance<\/h3>\n

Livestock farms depend on regular pasture mowing to promote new growth and control invasive weeds. This agricultural flail mower gearbox drives the flail drum at the correct speed to mulch grass, clover, and broadleaf weeds into fine particles that decompose quickly and return nutrients to the soil, eliminating the need for separate raking and collection passes.<\/p>\n<\/div>\n

\n

2. Brush and Bramble Control<\/h3>\n

Overgrown fence lines, drainage ditches, and field margins accumulate woody stems and bramble that rotary mowers cannot handle. The 443 Nm output torque of this heavy duty flail mower gearbox provides the sustained cutting force needed to shred saplings up to 50 mm in diameter and dense blackberry thickets without stalling the drum or overheating the gearbox internals.<\/p>\n<\/div>\n

\n

3. Vineyard and Orchard Under-Row Mowing<\/h3>\n

Compact gearbox configurations suit the narrow-row flail mowers used between vines, olive trees, and fruit tree rows. The TL-312A’s moderate 27 kg weight keeps the mower’s offset arm stress within limits, while its 76.5 kW capacity handles cover crop residues, dropped fruit, and undergrowth that compete with cash crops for water and soil nutrients.<\/p>\n<\/div>\n

\n

4. Roadside and Municipal Verge Mowing<\/h3>\n

Highway departments and municipal contractors require gearboxes that withstand frequent stone impacts, litter strikes, and continuous operation throughout the growing season. This flail mower gearbox parts assembly uses hardened gears and reinforced seals specifically rated for the debris-heavy conditions of verge maintenance, where hidden objects create sudden torque spikes every few minutes.<\/p>\n<\/div>\n

\n

5. Crop Residue Management and Stubble Mulching<\/h3>\n

After grain harvest, corn stalks, soybean stems, and cereal stubble must be chopped and incorporated into the soil to prepare for the next planting cycle. A tractor flail mower gearbox paired with a wide-cut drum processes residue rows at tractor speed, saving a separate tillage pass and accelerating organic matter decomposition. This reduces disease carryover between crop seasons.<\/p>\n<\/div>\n

\n

6. Solar Farm and Industrial Site Vegetation Control<\/h3>\n

Solar arrays, pipeline corridors, and industrial perimeters need regular mowing to comply with fire codes and prevent vegetation from shading equipment. The flail mower PTO gearbox provides the mechanical reliability needed for contractors working on remote sites where downtime means mobilizing service trucks across long distances, making gearbox durability a top operational priority.<\/p>\n<\/div>\n

\n

7. Sports Turf and Golf Course Rough Maintenance<\/h3>\n

Golf course roughs, cricket outfields, and sports field margins benefit from flail mowing because the fine mulch produced does not leave windrows. The precise speed control of this flail mower gearbox assembly ensures uniform cut heights across varying grass densities, helping turf managers maintain consistent playing surfaces while recycling clippings directly into the soil profile.<\/p>\n<\/div>\n

\n

8. Forestry and Land Clearing Preparation<\/h3>\n

Before reforestation or construction begins, undergrowth and small-diameter trees must be cleared to ground level. A 3 point flail mower gearbox driving a heavy-duty drum with hammer flails can process this material in a single pass, converting standing brush into a mulch layer that protects soil from erosion during the construction phase and decomposes naturally over the following months.<\/p>\n

\"Flail<\/p>\n

TL-312A Flail Mower Gearbox Manufacturing Process<\/h2>\n

Step 1: Pattern Making and Sand Casting
\nProduction begins with precision aluminum patterns that define the internal geometry of the GG25 cast iron housing. Sand molds are formed around these patterns, and molten iron is poured at controlled temperatures to fill every cavity, including bearing bore cores, oil channel features, and mounting boss shapes. After solidification, the raw castings are cleaned, shot-blasted, and inspected for porosity or shrinkage defects before moving to machining.<\/p>\n

Step 2: CNC Machining of Housing
\nMulti-axis CNC machining centers bore the bearing seats, face the gasket surfaces, drill and tap the bolt holes, and finish the mounting flanges to the exact dimensions required for drop-in Comer compatibility. Each housing half goes through dimensional verification using coordinate measuring machines (CMM), confirming that bore center distances, perpendicularity, and surface finishes meet the engineering drawings before the parts are approved for assembly.<\/p>\n

Step 3: Gear Forging and Heat Treatment
\nGear blanks are hot-forged from high-carbon alloy steel billets to align the metal’s grain structure along the tooth root, maximizing bending fatigue strength. After rough machining, the gears undergo carburizing heat treatment to produce a hard, wear-resistant surface layer (typically 58-62 HRC) while retaining a tough, ductile core that absorbs shock loads without cracking. Each gear batch is tested with hardness spot checks and metallographic sampling.<\/p>\n

Step 4: Gear Grinding and Profile Finishing
\nAfter heat treatment, the tooth flanks are precision-ground on CNC gear grinding machines to achieve the involute profile accuracy required for smooth, low-noise meshing. This grinding step removes any heat-treatment distortion from the tooth surfaces and produces the micro-finish that promotes full-film lubrication at operating speeds. Finished gears are checked on gear inspection machines that verify tooth profile, lead, pitch, and runout against established quality standards.<\/p>\n

Step 5: Shaft Machining and Spline Cutting
\nInput and output shafts are turned from alloy steel bar stock on CNC lathes, then the 1″3\/8 Z-6 spline profiles are cut using hobbing or broaching machines. After spline cutting, the shafts are heat-treated to the required surface hardness. Bearing journals are finish-ground to tight roundness and surface-finish tolerances, and every shaft is checked for straightness and concentricity to prevent vibration at operating speed.<\/p>\n

Step 6: Assembly and Shimming
\nTrained technicians install bearings onto the shafts, press the gears into position, and assemble the shaft assemblies into the machined housing. Shim packs are selected to set the correct bearing preload and gear backlash, which directly affect noise, efficiency, and component life. Each seal is carefully seated to confirm proper lip contact on the shaft journal. The housing halves are then bolted together with calibrated torque wrenches.<\/p>\n

Step 7: Run-In Testing and Quality Inspection
\nEvery assembled gearbox is filled with test oil and run on a powered test stand to verify smooth operation, correct rotation direction (CCW output), and absence of abnormal noise or vibration. Technicians check for oil leaks at every seal and gasket joint while the unit is running under load. Temperature readings confirm that the gearbox operates within thermal limits. Units that pass all quality gates receive identification markings and are drained of test oil before packaging.<\/p>\n

Step 8: Surface Treatment and Packaging
\nAfter passing final inspection, the exterior of each housing receives a corrosion-resistant coating (paint or powder coat) for protection during shipping and storage. Open shaft splines and flange surfaces are coated with a thin layer of rust-preventive oil. The finished gearbox is packed in a dedicated carton with foam supports, accompanied by a technical data sheet and maintenance instructions. Palletized shipments are stretch-wrapped for international ocean freight.<\/p>\n

\"\u30d5\u30ec\u30a4\u30eb\u30e2\u30a2\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\"<\/p>\n

\u3088\u304f\u3042\u308b\u6545\u969c\u3068\u305d\u306e\u89e3\u6c7a\u7b56<\/h2>\n
\n

Oil Leakage from Shaft Seals<\/h3>\n

\u75c7\u72b6\uff1a<\/strong> Oil drips or puddles under the gearbox, and the oil level drops between scheduled checks.
\n\u539f\u56e0\uff1a<\/strong> Worn or damaged shaft seals, typically caused by dirt buildup on the shaft journal or seal lip aging.
\n\u89e3\u6c7a\uff1a<\/strong> Replace the flail mower gearbox oil seal at the leaking shaft position. Clean the shaft surface thoroughly and inspect for scoring or grooves that could prevent a new seal from seating properly.<\/p>\n<\/div>\n

\n

Excessive Noise or Grinding During Operation<\/h3>\n

\u75c7\u72b6\uff1a<\/strong> Loud whining, clicking, or grinding sounds coming from the gearbox under load.
\n\u539f\u56e0\uff1a<\/strong> Worn or chipped gear teeth, insufficient lubricant level, or bearing failure.
\n\u89e3\u6c7a\uff1a<\/strong> Drain the oil and inspect for metal particles. Check the lubricant level and refill with SAE 80W-90 if low. If contamination or metal shavings are found, disassemble and replace worn gears or bearings during a full flail mower gearbox repair session.<\/p>\n<\/div>\n

\n

Overheating of the Gearbox Housing<\/h3>\n

\u75c7\u72b6\uff1a<\/strong> The housing is too hot to touch after normal mowing periods, and the paint may discolor.
\n\u539f\u56e0\uff1a<\/strong> Low oil level, wrong oil viscosity, overloaded operation, or blocked breather vent.
\n\u89e3\u6c7a\uff1a<\/strong> Verify the oil level is at the correct fill mark and the SAE 80W-90 specification is met. Clean or replace the breather valve. Reduce mowing speed or drum engagement when working through extremely dense vegetation.<\/p>\n<\/div>\n

\n

Vibration Transmitted to the Tractor Frame<\/h3>\n

\u75c7\u72b6\uff1a<\/strong> Strong vibration felt through the tractor seat and steering column when the PTO is engaged.
\n\u539f\u56e0\uff1a<\/strong> Worn U-joints on the PTO driveline, unbalanced flail drum, loose mounting bolts, or bearing play inside the gearbox.
\n\u89e3\u6c7a\uff1a<\/strong> Inspect and replace worn U-joints. Check the flail drum for missing or damaged flails. Verify all mounting bolts are torqued to specification and that the gearbox bearings have no excessive radial play.<\/p>\n<\/div>\n

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Gearbox Fails to Transmit Power<\/h3>\n

\u75c7\u72b6\uff1a<\/strong> The PTO shaft turns but the flail drum does not spin.
\n\u539f\u56e0\uff1a<\/strong> Stripped input spline, broken gear teeth, sheared keyway, or failed free wheel mechanism.
\n\u89e3\u6c7a\uff1a<\/strong> Disconnect the driveline and rotate the input shaft by hand to check for internal engagement. If no resistance is felt, the gears or free wheel may be damaged. Disassemble the gearbox, identify the failed part, and replace with matching flail mower gearbox parts.<\/p>\n<\/div>\n

\n

Water or Dirt Contamination in Oil<\/h3>\n

\u75c7\u72b6\uff1a<\/strong> Milky or gritty oil visible on the dipstick or during an oil change.
\n\u539f\u56e0\uff1a<\/strong> Failed shaft seals, cracked housing, damaged gasket, or storing the mower outdoors without a gearbox cover.
\n\u89e3\u6c7a\uff1a<\/strong> Drain contaminated oil immediately. Identify and repair the entry point (seal, gasket, or housing crack). Flush the interior with clean oil before refilling with fresh SAE 80W-90 flail mower gearbox oil.<\/p>\n<\/div>\n

\n

Cracked or Broken Housing<\/h3>\n

\u75c7\u72b6\uff1a<\/strong> Visible cracks on the gearbox housing, or a sudden loss of oil accompanied by a loud bang.
\n\u539f\u56e0\uff1a<\/strong> Severe impact from a large rock or stump striking the mower frame, or a torque overload event caused by a seized drum.
\n\u89e3\u6c7a\uff1a<\/strong> A cracked housing generally cannot be repaired reliably. Replace the entire gearbox assembly with a new TL-312A unit. Install or verify overload protection devices (slip clutch or shear bolt) to prevent recurrence.<\/p>\n<\/div>\n

\n

\u30d9\u30a2\u30ea\u30f3\u30b0\u306e\u65e9\u671f\u7834\u640d<\/h3>\n

\u75c7\u72b6\uff1a<\/strong> Rough, growling sound from the gearbox that increases with speed, or detectable shaft end play when rocked by hand. \u539f\u56e0\uff1a<\/strong> Insufficient lubrication, incorrect bearing preload from improper shimming, or contaminated oil allowing abrasive wear. \u89e3\u6c7a\uff1a<\/strong> Replace both the failed bearing and its seal. Verify shimming during reassembly and fill with clean SAE 80W-90 oil to the specified 1.5-liter capacity. Follow the recommended oil change schedule to prevent repeat failure of flail mower gearbox bearings.<\/p>\n

\"\u30d5\u30ec\u30a4\u30eb\u30e2\u30a2\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\"<\/p>\n

Flail Mower Gearbox and PTO Driveline Shaft<\/h2>\n

The flail mower gearbox and PTO\u99c6\u52d5\u8ef8<\/strong> <\/a>form a matched pair in every tractor-driven flail mowing system. Neither component can function without the other: the PTO driveline shaft carries rotational power from the tractor’s rear PTO stub to the gearbox input spline, while the gearbox converts that power into the correct speed and torque for the flail drum. Selecting the right shaft for a given gearbox involves matching spline sizes, torque ratings, operating angles, and PTO speed (540 RPM or 1000 RPM) to make sure power flows efficiently and safely from engine to cutting drum.<\/p>\n

A PTO driveline shaft for a flail mower is a telescopic mechanical connection that bridges the gap between the tractor’s Power Take-Off stub and the mower’s gearbox input shaft. It consists of two tubular halves that slide within each other to accommodate changes in distance as the mower follows terrain contours or the three-point hitch raises and lowers. At each end, a universal joint (U-joint) allows the shaft to operate at an angle relative to the tractor PTO and the gearbox input, compensating for vertical and lateral offsets between the two connection points.<\/p>\n

Standard safety features include a plastic or sheet-metal guard that covers the rotating shaft and U-joints to protect the operator from entanglement. The splined connections at each yoke must match the PTO stub on the tractor side (typically 1″3\/8 Z-6 for 540 RPM tractors or 1″3\/4 Z-20 for 1000 RPM) and the gearbox input spline on the mower side. For the TL-312A with its 1″3\/8 Z-6 input, a standard 1000 RPM driveline shaft with the matching spline profile is required.<\/p>\n

When the tractor operator engages the PTO clutch, the PTO stub begins rotating at the engine-governed speed (1000 RPM for the TL-312A configuration). This rotation transfers through the driveline shaft’s first U-joint, along the telescopic tubes, through the second U-joint, and into the gearbox input spline. The gearbox then converts the 1000 RPM input into 1600 RPM output at 443 Nm to the flail drum. Operating angles at the U-joints should be kept below 25 degrees and should be equal at both ends to minimize vibration and extend joint life.<\/p>\n

Proper shaft sizing is essential for safe power delivery. The driveline shaft must be rated for at least the 76.5 kW that the TL-312A can transmit, with a safety factor for the transient shock loads that occur when flails strike hard objects. Under-rated shafts can fail catastrophically under these conditions, posing a danger to the operator and anyone nearby. The telescopic overlap between the two tube halves must remain within the manufacturer’s specified range at all hitch positions to prevent the shaft from separating during operation.<\/p>\n

Regular greasing of U-joint cross bearings and telescopic tube splines is the most critical maintenance task for PTO driveline shafts. Dry joints wear rapidly and develop play that increases vibration and accelerates wear on the gearbox input bearing. Operators should inspect guards for damage before each use, check for excessive play in the U-joints by hand, and confirm that the shaft length is correct for the specific tractor-mower combination. Replacing worn U-joints and damaged guards promptly protects both the operator and the flail mower gearbox assembly from avoidable failure.<\/p>\n

\"PTO\u30b7\u30e3\u30d5\u30c8\"<\/p>\n

\u30d5\u30ec\u30a4\u30eb\u30e2\u30a2\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9 vs. \u80a5\u6599\u6563\u5e03\u6a5f\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/h2>\n

\u30d5\u30ec\u30a4\u30eb\u30e2\u30a2\u306e\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n

Flail mower gearboxes are mechanical power transmission units that connect the tractor’s PTO output to the mower’s rotating flail drum. They convert the PTO’s high rotational speed into the specific drum RPM and torque needed to drive hardened-steel flail blades through standing vegetation. Internal gear sets regulate the speed ratio (such as 1:1.6, 1:1.93, or 1:3), and the housing protects gears, shafts, and bearings from the abrasive and impact-heavy conditions of mowing. Built for sustained cutting loads and shock tolerance, these gearboxes use heavy-wall cast iron or alloy steel construction with reinforced seals to keep debris out and lubricant in.<\/p>\n

\u30d5\u30ec\u30a4\u30eb\u30e2\u30a2\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\u306e\u5229\u70b9<\/h4>\n
    \n
  • Shock Load Resilience:<\/strong> Designed to absorb sudden torque spikes from flails hitting rocks, stumps, and hidden debris without cracking the housing or stripping gear teeth, ensuring continuous operation even in rough terrain.<\/li>\n
  • \u4e00\u5b9a\u306e\u30ed\u30fc\u30bf\u30fc\u901f\u5ea6\uff1a<\/strong> The fixed mechanical gear ratio maintains drum RPM within a tight range regardless of cutting load variations, producing a uniform mulch finish without operator speed adjustments.<\/li>\n
  • Sealed Against Vegetation Debris:<\/strong> Multi-stage shaft seals and gasketed housing joints keep chopped plant fibers, dirt, and moisture out of the oil bath, which is critical in the dusty, debris-filled environment of mowing operations.<\/li>\n
  • \u9ad8\u30c8\u30eb\u30af\u51fa\u529b\uff1a<\/strong> Gear reduction or increase ratios deliver the specific torque to the drum that belt or chain drives cannot match, enabling the mower to process dense brush and woody material without stalling.<\/li>\n<\/ul>\n

    \u30d5\u30ec\u30a4\u30eb\u30e2\u30a2\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\u306e\u7528\u9014<\/h4>\n
      \n
    • \u7267\u8349\u5730\u7ba1\u7406\uff1a<\/strong> Regular mowing of grazing paddocks to control weeds, promote fresh grass growth, and maintain even sward heights for livestock feeding efficiency across dairy and beef operations.<\/li>\n
    • Roadside and Highway Maintenance:<\/strong> Municipal and government mowing crews use flail mowers along road shoulders and median strips to maintain sightlines, reduce fire risk, and comply with vegetation height regulations.<\/li>\n
    • Orchard and Vineyard Floor Care:<\/strong> Under-row flail mowers shred cover crops, dropped fruit, and weed growth between tree and vine rows without damaging trunks or support structures.<\/li>\n
    • Crop Residue Shredding:<\/strong> After grain and oilseed harvest, flail mowers chop remaining stalks and stubble to accelerate decomposition and prepare fields for the next planting cycle.<\/li>\n<\/ul>\n

      \u80a5\u6599\u6563\u5e03\u6a5f\u306e\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\u3068\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h3>\n

      A fertilizer spreader gearbox, also called a fertilizer distributor gearbox, sits at the center of broadcast spreading machinery and transmits power from the tractor’s PTO to the spinning discs or augers that distribute granular fertilizer, lime, or seed evenly across field surfaces. These gearboxes are engineered for consistent rotational speed output rather than high torque, because the load on spreading discs is relatively constant and predictable compared to the impact-driven load profile of a flail mower. The internal gear arrangement converts PTO speed to the disc RPM that produces the desired throw pattern and spread width. Built to operate reliably in corrosive environments where fertilizer dust and chemical residues attack metal surfaces, spreader gearboxes feature corrosion-resistant coatings and sealed shaft interfaces.<\/p>\n

      \u80a5\u6599\u6563\u5e03\u6a5f\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\u306e\u5229\u70b9<\/h4>\n
        \n
      • \u7cbe\u5bc6\u306a\u901f\u5ea6\u5236\u5fa1\uff1a<\/strong> Maintains disc RPM within tight tolerances to achieve uniform spread patterns, preventing under- or over-application of fertilizer that wastes product and damages crops.<\/li>\n
      • Chemical Corrosion Resistance:<\/strong> Housing surfaces and shaft seals are specifically treated to resist the acidic and hygroscopic nature of fertilizer chemicals, which would corrode untreated cast iron within a single season.<\/li>\n
      • Smooth, Low-Vibration Operation:<\/strong> Because spreading loads are steady and predictable, spreader gearboxes are optimized for quiet running and low vibration, which reduces operator fatigue during long field application sessions.<\/li>\n
      • Multi-Output Configurations:<\/strong> Many spreader gearboxes drive two or more spinning discs simultaneously through separate output shafts, allowing wide spreading patterns from a single gearbox unit.<\/li>\n<\/ul>\n

        \u80a5\u6599\u6563\u5e03\u6a5f\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\u306e\u7528\u9014<\/h4>\n
          \n
        • \u4f5c\u7269\u683d\u57f9\uff1a<\/strong> Uniform application of granular fertilizers across grains, vegetables, and fruit crops to promote optimal nutrient absorption and maximize yields during critical growth stages.<\/li>\n
        • Pasture Fertilization:<\/strong> In livestock operations, spreader gearboxes ensure even fertilizer distribution across pastures, improving forage quality and grazing capacity for dairy and beef herds.<\/li>\n
        • \u829d\u751f\u30fb\u7267\u8349\u5730\u7ba1\u7406\uff1a<\/strong> Sports fields, golf courses, and commercial landscapes rely on precision spreading for healthy, uniform turf growth without burning from excess application.<\/li>\n
        • \u5712\u82b8\u3068\u82d7\u6728\u683d\u57f9\uff1a<\/strong> Greenhouses and container nurseries use spreader-driven systems for accurate fertilizer dosing on potted plants and ornamental crop beds.<\/li>\n
        • \u9020\u5712\u3068\u30ac\u30fc\u30c7\u30cb\u30f3\u30b0\uff1a<\/strong> Small-acreage gardens and flower beds benefit from controlled fertilizer spreading that enhances plant vitality without waste or runoff.<\/li>\n
        • Soil Amendment Distribution:<\/strong> Spreader gearboxes effectively distribute lime, gypsum, comite, and organic composts to correct soil pH and improve long-term soil structure and fertility.<\/li>\n<\/ul>\n

          \u6bd4\u8f03\u8868<\/h3>\n
          \n\n\n\n\n\n\n\n\n\n\n\n\n
          \u7279\u5fb4<\/th>\n\u30d5\u30ec\u30a4\u30eb\u30e2\u30a2\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/th>\n\u80a5\u6599\u6563\u5e03\u6a5f\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9<\/th>\n<\/tr>\n<\/thead>\n
          \u4e3b\u8981\u6a5f\u80fd<\/td>\nDrive flail rotor drum for vegetation cutting<\/td>\n\u80a5\u6599\u6563\u5e03\u7528\u306e\u56de\u8ee2\u30c7\u30a3\u30b9\u30af\u3092\u99c6\u52d5\u3059\u308b<\/td>\n<\/tr>\n
          \u8ca0\u8377\u30bf\u30a4\u30d7<\/td>\nHigh-shock, variable impact loads<\/td>\nSteady, predictable constant loads<\/td>\n<\/tr>\n
          \u30c8\u30eb\u30af\u8981\u4ef6<\/td>\nHigh (e.g., 443 Nm for TL-312A)<\/td>\n\u4e2d\u7a0b\u5ea6\u304b\u3089\u4f4e<\/td>\n<\/tr>\n
          \u30b9\u30d4\u30fc\u30c9\u512a\u5148<\/td>\nTorque delivery with controlled rotor RPM<\/td>\nPrecise disc RPM for spread pattern accuracy<\/td>\n<\/tr>\n
          Housing Strength<\/td>\nHeavy-wall cast iron (GG25) for impact resistance<\/td>\nStandard cast iron or aluminum alloy<\/td>\n<\/tr>\n
          Corrosion Threat<\/td>\nMoisture, soil particles, plant debris<\/td>\nChemical fertilizer dust, acidic residues<\/td>\n<\/tr>\n
          Output Shafts<\/td>\nTypically single output to drum hub<\/td>\nOften dual output to two spinning discs<\/td>\n<\/tr>\n
          \u904e\u8ca0\u8377\u4fdd\u8b77<\/td>\nSlip clutch or shear bolt compatible<\/td>\n\u901a\u5e38\u306f\u4e0d\u8981<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n\n\n\n
          \"TL-312A<\/td>\n\"\u80a5\u6599\u6563\u5e03\u6a5f\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\"<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Why Choose CMN Transmission’s Flail Mower Gearboxes?<\/h2>\n

          Korea CMN Transmission Co., Ltd. was established in 2000 and operates from its manufacturing base in Sandan-o, Danwon-gu, Ansan-si, Gyeonggi-do, Korea. With over 100 factory employees dedicated to the research, development, manufacturing, sales, and service of agricultural gearboxes, CMN Transmission has grown over the past two decades into a trusted supplier for the global agricultural equipment industry, exporting to more than 60 countries and regions worldwide.<\/p>\n

          Our product catalog covers nearly one thousand gearbox specifications across a wide range of agricultural machinery applications: rotary cutter gearboxes, rotary tiller gearboxes, feed mixer gearboxes, rotary mower gearboxes, fertilizer spreader gearboxes, flail mower gearboxes, post hole digger gearboxes, round baler gearboxes, square baler gearboxes, disc mower gearboxes, center pivot irrigation gearboxes, hydraulic drive gearboxes, silage machine gearboxes, orchard sprayer gearboxes, rotary rake gearboxes, combine harvester gearboxes, grain storage gearboxes, grain transportation gearboxes, corn header gearboxes, cutting bar gearboxes, poultry feeding gearboxes, and custom agricultural gearboxes engineered to customer drawings and specifications. Beyond gearboxes, our product range includes PTO shafts, U-joints, yokes, tubes, torque limiters, covers, adapters, couplings, bearings, blades, chains, and sprockets.<\/p>\n

          With an annual production quantity exceeding 500,000 units, CMN Transmission delivers the manufacturing scale that keeps lead times short and pricing competitive without sacrificing quality. Every gearbox is produced under CE and ISO 9001 certified management systems, with incoming material inspection, in-process quality checks, and final assembly testing built into every production run.<\/p>\n

          What sets CMN apart for flail mower gearbox buyers specifically is our deep experience with European OEM replacement specifications. Our engineering team maintains detailed cross-reference databases for Comer, Omni Gear, and other major gearbox brands, ensuring that every replacement unit matches the original in bolt patterns, shaft dimensions, gear ratios, and torque ratings. When you order a TL-312A, you receive a gearbox that drops onto your mower frame without modification, backed by technical drawings and dimensional verification data.<\/p>\n

          Our products reach customers across the United States, Canada, Mexico, Brazil, Argentina, France, Germany, Italy, Spain, the United Kingdom, Russia, China, India, Thailand, Vietnam, Turkey, Australia, and New Zealand. Whether you are an OEM building new mowers, a distributor stocking replacement parts, or a farm operator needing a single gearbox, CMN Transmission has the capacity, expertise, and logistics network to deliver. We support custom production based on customer drawings and specifications for agricultural gearboxes, PTO shafts, and all related agricultural machinery components. Contact us today for pricing, technical consultation, or to request a sample.<\/p>\n

          \"\u30ed\u30fc\u30bf\u30ea\u30fc\u8015\u3046\u3093\u6a5f\u7528\u30ae\u30a2\u30dc\u30c3\u30af\u30b9\u30e1\u30fc\u30ab\u30fc\"<\/p>\n

          \u3088\u304f\u3042\u308b\u8cea\u554f<\/h2>\n

          Q: Will this TL-312A gearbox fit my existing flail mower that currently uses a Comer TL-312A?<\/strong>
          \nA: Yes. The TL-312A is manufactured as a direct replacement for the Comer TL-312A gearbox. All mounting bolt patterns, flange dimensions, input and output spline profiles (1″3\/8 Z-6), and housing geometry match the original Comer specifications. You can bolt this unit onto your existing mower frame without drilling new holes, fabricating adapter plates, or modifying the driveline shaft. The weight is identical at 27 kg.<\/p>\n

          Q: What type of oil should I use for this flail mower gearbox, and how much does it hold?<\/strong>
          \nA: Use SAE 80W-90 gear oil, which is a standard EP (extreme pressure) gear lubricant available from most automotive and agricultural supply stores. The maximum oil capacity is 1.5 liters. The gearbox ships without oil, so you must fill it before the first use. For the initial break-in period, change the flail mower gearbox oil at 50 to 70 operating hours, then follow a 500-hour or annual change interval thereafter.<\/p>\n

          Q: Can I use this gearbox with a 540 RPM PTO tractor instead of 1000 RPM?<\/strong>
          \nA: The TL-312A with a 1:1.6 ratio is rated for a maximum input speed of 1000 RPM. If your tractor has a 540 RPM PTO, the gearbox will function mechanically, but the output speed and torque will be lower, which may not provide enough drum RPM for effective cutting. CMN Transmission offers the TL-312A in a 1:3 ratio variant specifically designed for 540 RPM flail mower gearbox applications. Contact the sales team to confirm the correct ratio for your tractor.<\/p>\n

          Q: How do I know when the flail mower gearbox bearings need replacement?<\/strong>
          \nA: Common signs of bearing wear include a growling or rumbling noise from the gearbox that increases with speed, detectable shaft play when you rock the input or output shaft by hand, and elevated housing temperature compared to normal operation. If you notice metal particles in the oil during a drain, this is a strong indicator that bearing surfaces are deteriorating. Timely bearing replacement during scheduled flail mower gearbox repair prevents more expensive damage to the gears and housing.<\/p>\n

          Q: Does CMN Transmission supply individual flail mower gearbox parts for the TL-312A?<\/strong>
          \nA: Yes. In addition to complete gearbox assemblies, CMN Transmission stocks individual replacement components including gears, bearings, input shafts, output shafts, oil seals, gaskets, and free wheel mechanisms for the TL-312A. This allows workshops and fleet operators to rebuild existing units during off-season maintenance rather than replacing the entire gearbox. Contact the parts department with your gearbox serial number for accurate part identification.<\/p>\n

          Q: What is the difference between a 1:1.6 and 1:3 flail mower gearbox ratio?<\/strong>
          \nA: The ratio determines how the gearbox converts input speed to output speed. A 1:1.6 ratio is a speed-increasing configuration designed for 1000 RPM PTO inputs, producing higher drum RPM at moderate torque. A 1:3 ratio is a speed-reducing configuration for 540 RPM PTO inputs, producing lower RPM but higher torque at the output. The correct ratio depends on your tractor’s PTO speed and the cutting requirements of your mower. Both variants share the same housing, mounting dimensions, and shaft splines.<\/p>\n

          Q: Can this gearbox be used on a 3 point hitch flail mower?<\/strong>
          \nA: Yes. The TL-312A is compatible with both 3 point flail mower configurations and offset-arm designs. The standardized Comer-pattern mounting flange accommodates the gearbox brackets found on most European and North American flail mower frames. Whether your mower mounts directly behind the tractor on the three-point linkage or on a hydraulic side arm, the gearbox bolt pattern, shaft orientation, and overall dimensions will match as long as the original unit was a Comer 312 series.<\/p>\n

          Q: How long does shipping take and how is the gearbox packaged?<\/strong>
          \nA: Shipping times vary by destination. Most orders to Europe, North America, and Oceania arrive within 10 to 21 business days via ocean freight, with faster air freight options available on request. Each gearbox is individually packed in a reinforced carton with foam inserts to protect flanges, shafts, and splines during transit. The outer carton is labeled with the part number and handling instructions. Palletized orders are stretch-wrapped for additional protection during container loading.<\/p>\n

          Q: What maintenance schedule should I follow for maximum gearbox life?<\/strong>
          \nA: Fill the gearbox with 1.5 liters of SAE 80W-90 gear oil before first use. Change the oil at 50 to 70 hours (break-in period), then every 500 hours or at least once per year. Before each mowing session, check the oil level and inspect for leaks around seals and gaskets. Grease the PTO driveline shaft U-joints and splines at every use. Store the mower with the gearbox in a dry location during the off-season. Following this schedule typically yields 2,000 or more operating hours before internal components need attention.<\/p>\n

          Q: Do you offer technical support for gearbox installation and troubleshooting?<\/strong>
          \nA: Yes. CMN Transmission provides technical support for all gearbox products, including installation guidance, dimensional drawings, and troubleshooting assistance. Our engineering team can supply CAD drawings and cross-reference charts to confirm fitment before you order. If you encounter issues during installation or operation, contact us by email or phone and our technical staff will help resolve the problem. We also maintain a library of maintenance documentation for the full TL-312A flail mower gearbox assembly product line.<\/p>\n

          \"TL-312A<\/p>\n

          \u304a\u5ba2\u69d8\u306e\u58f0<\/h2>\n

          Robert Dawson, Cattle Ranching, United States<\/strong>
          \n“We run a 1,400-acre cattle operation in central Texas and needed to replace the original Comer gearbox on our 2.4-meter Berti flail mower. The TL-312A bolted right on, all eight mounting holes lined up perfectly, and the 1″3\/8 splines matched without any play. Put about 280 hours on it through two mowing seasons, changed the oil at 65 hours and again at 500 hours. The drained oil came out clean both times, no metal particles at all. Solid unit for the price, especially compared to what the dealer was asking for the OEM part.”<\/p>\n

          Jean-Marc Lefevre, Vineyard Management, France<\/strong>
          \n“I manage a vineyard maintenance crew in the Bordeaux region and we go through flail mower gearboxes every couple of years because of the rocky limestone soil. Ordered two TL-312A units in March for our under-row Nobili mowers. The 1:1.6 ratio gives us the drum speed we need for vine pruning residues. The customer service team responded within a few hours when I asked about the correct oil fill level. Delivery to France took twelve days, well packed in foam-lined cartons. Very satisfied with the build quality.”<\/p>\n

          Klaus Bergmann, Municipal Works, Germany<\/strong>
          \n“Our municipality mows about 120 km of road verges every season in Bavaria, and the Comer gearboxes on our Kuhn machines used to be the most frequent breakdown item. Switched to the TL-312A replacement this spring. The cast iron housing feels just as heavy and solid as the original. After 350 operating hours, no leaks, no noise issues, and no sign of wear on the output spline. The 27 kg weight is identical to the Comer unit so the mower arm balance did not change. Good value.”<\/p>\n

          Craig Henderson, Dairy Farm Mowing, Australia<\/strong>
          \n“We run a contract mowing business servicing dairy farms across Waikato, New Zealand. Bought three TL-312A gearboxes to keep as spares because a broken gearbox during peak season means lost contracts. The first unit went on our older Agrimaster mower and the spline fit was spot-on. The free wheel mechanism works smoothly when disengaging the PTO. Only suggestion would be including a small tube of thread-lock with the bolts. Otherwise, these are quality replacement parts at a fair price.”<\/p>\n

          Ricardo Almeida, Sugarcane Cooperative, Brazil<\/strong>
          \n“Our farm cooperative in Sao Paulo state operates twelve flail mowers for sugarcane field preparation and we replace gearboxes fairly regularly due to the harsh conditions. The TL-312A is the first aftermarket unit that has survived a full season without needing seal replacement. The oil capacity is adequate at 1.5 liters and the housing does not run as hot as our previous units. Shipping to Brazil was handled through their freight forwarder and arrived in about three weeks with all paperwork in order.”<\/p>\n

          Mark Thompson, Mixed Farming, Canada<\/strong>
          \n“I needed a gearbox replacement for my Maschio Barbi flail mower, which originally came with a Comer 312 series unit. The CMN TL-312A dropped straight in. The gear teeth are cleanly finished and the bearings spin freely without any roughness. I run it on a 95 HP tractor at 1000 RPM PTO speed and it handles dense blackberry scrub along our fence lines without any sign of strain. After 180 hours, the oil looked normal and the unit runs quietly. Would order again.”<\/p>\n

          Marco Rinaldi, Agricultural Equipment Dealer, Italy<\/strong>
          \n“We service agricultural equipment across the Lombardy region and stock TL-312A gearboxes for customers who own Berti, Maschio, and Nobili flail mowers. The quality is consistent across every unit we have installed. Bolt patterns match, splines are cut accurately, and the free wheel engages and disengages cleanly. Our customers appreciate the lower price point compared to going back to the Comer dealer. We have sold about fifteen units so far this year with zero warranty returns.”<\/p>\n

          Javier Moreno, Landscaping Services, Spain<\/strong>
          \n“Our landscaping company maintains commercial properties and highway corridors around Castilla y Leon. We replaced a failed Comer gearbox on our Serrat mower with the TL-312A and the installation took less than an hour. The 76.5 kW rating gives us plenty of headroom because our tractor only puts out about 60 kW at the PTO. After a full summer of roadside mowing, maybe 220 hours, everything is tight with no oil seepage. Packaging was good, product arrived without any shipping damage.”<\/p>\n

          Mehmet Yilmaz, Agricultural Workshop, Turkey<\/strong>
          \n“I operate a small agricultural equipment workshop in Antalya and my customers often need replacement gearboxes for their European-brand flail mowers. The TL-312A is the first aftermarket gearbox I have found that truly matches the Comer original in terms of dimensional accuracy. The cast iron housing thickness, bearing bore sizes, and shaft runout are all within acceptable tolerances. My customers report smooth operation and good oil retention. The CMN team was helpful with technical drawings when I needed to verify fitment before ordering a batch of six units.”<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

          The TL-312A Flail Mower Gearbox Ratio 1:1.6 serves as a direct Replacement for Comer TL-312A Gearbox, engineered to transfer up to 76.5 kW of tractor PTO power into 443 Nm of output torque for reliable vegetation cutting. This agricultural flail mower gearbox features a speed-increasing 21\/22-tooth gear set housed inside a GG25 cast iron shell, providing the structural stiffness needed to withstand continuous shock loads from flail impacts against rocks, stumps, and compacted soil.<\/p>","protected":false},"featured_media":8611,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"The TL-312A Flail Mower Gearbox Ratio 1:1.6 Replacement for Comer TL-312A Gearbox is an essential component in a flail mower, designed to efficiently convert the tractor\u2019s PTO power into the necessary torque for effective vegetation cutting. Constructed from high-quality materials such as cast iron or aluminum alloy, these gearboxes are built to withstand the demands of heavy-duty mowing operations. The gearbox houses a set of interlocking gears such as spur, worm, or bevel gears encased in a robust housing that protects internal components from dirt and debris. Regular lubrication ensures smooth operation and extends the gearbox\u2019s lifespan.\r\n\r\n\"TL-312A\r\n

          Technical Parameters<\/h2>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
          Model<\/strong><\/td>\r\nTL-312A\u00a0 Flail Mower Gearbox 1:1.6<\/td>\r\n<\/tr>\r\n
          Replace Brand<\/strong><\/td>\r\nComer<\/td>\r\n<\/tr>\r\n
          Product Details<\/strong><\/td>\r\n\r\n
            \r\n \t
          • All gearboxes are supplied without oil.<\/li>\r\n \t
          • First oil change after 50-70 operating hours, then after 500-700 operating hours or at least once a year.<\/li>\r\n \t
          • Contact us for power at a different RPM.<\/li>\r\n<\/ul>\r\n<\/td>\r\n<\/tr>\r\n
          Application Range<\/strong><\/td>\r\n\r\n
            \r\n \t
          • Various (agricultural) applications<\/li>\r\n \t
          • Flail Mowers<\/li>\r\n<\/ul>\r\n<\/td>\r\n<\/tr>\r\n
          Ratio\u00a0<\/strong><\/td>\r\n1:1.6<\/td>\r\n<\/tr>\r\n
          Connection 1 Outside Diameter inch and splines<\/strong><\/td>\r\n1\"3\/8 Z-6<\/td>\r\n<\/tr>\r\n
          Connection 2 Outside Diameter inch and splines<\/strong><\/td>\r\n1\"3\/8 Z-6<\/td>\r\n<\/tr>\r\n
          Max. input Power<\/strong><\/td>\r\n76.5 kW<\/td>\r\n<\/tr>\r\n
          Max. input Rotation Speed<\/strong><\/td>\r\n1000 r\/min<\/td>\r\n<\/tr>\r\n
          Max. output power<\/strong><\/td>\r\n76.5 kW<\/td>\r\n<\/tr>\r\n
          Max. output power<\/strong><\/td>\r\n104 HP<\/td>\r\n<\/tr>\r\n
          Max. output Torque<\/strong><\/td>\r\n443 N\u00b7m<\/td>\r\n<\/tr>\r\n
          Gear Arrangement Increasing<\/strong><\/td>\r\n21-22<\/td>\r\n<\/tr>\r\n
          Contains Oil<\/strong><\/td>\r\nNo<\/td>\r\n<\/tr>\r\n
          Max. oil Capacity<\/strong><\/td>\r\n1.5 L<\/td>\r\n<\/tr>\r\n
          Max. oil Change Interval<\/strong><\/td>\r\n500 h<\/td>\r\n<\/tr>\r\n
          Oil SAE Viscosity Grade<\/strong><\/td>\r\n80W-90<\/td>\r\n<\/tr>\r\n
          Housing Material<\/strong><\/td>\r\nCast iron GG25<\/td>\r\n<\/tr>\r\n
          Weight<\/strong><\/td>\r\n27 kg<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nWe have completed a third-party supplier audit and company verification supported by SGS \/ T\u00dcV Rheinland. This verification helps buyers review company identity, business operations, supplier profile and general manufacturing capability. Product-specific inspection reports, material documents or compliance records can be provided according to order requirements.\r\n\r\nMinimum Order Quantity (MOQ):<\/strong>\u00a0Flexibly set based on the product type and order amount.\r\n\r\nSamples:<\/strong>\u00a0New customers may request 1\u20135 samples under appropriate circumstances.\r\n\r\nMixed Orders:<\/strong>\u00a0Combining different models is supported; the total order amount must reach approximately $1,500.\r\n\r\nSmall Orders:<\/strong>\u00a0Orders starting from 1\u20132 pieces are supported, but the unit price will be relatively higher.\r\n\r\nLead Time:<\/strong>\u00a010\u201325 working days for standard parts; 20\u201345 working days for customized components; 45\u2013120 working days for project-based equipment.\r\n\r\nTrade Terms:<\/strong>\u00a0EXW, FOB, CIF, and DAP are generally supported; FCA, CFR, CPT, CIP, and DDP terms can be specifically negotiated.\r\n

          TL-312A Flail Mower Gearbox Dimensions<\/h2>\r\n\"TL-312A \"TL-312A","_et_gb_content_width":""},"product_brand":[],"product_cat":[334],"product_tag":[326,336,338,339,340,341,342,337],"class_list":{"0":"post-8637","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-flail-mower-gearbox","7":"product_tag-agricultural-gearbox","8":"product_tag-agricultural-gearbox-for-flail-mower","9":"product_tag-flail-mower-gearbox","10":"product_tag-flail-mower-gearbox-for-sale","11":"product_tag-flail-mower-gearbox-manufacturers","12":"product_tag-flail-mower-gearbox-price","13":"product_tag-flail-mower-gearbox-suppliers","14":"product_tag-gearbox-for-flail-mower","16":"first","17":"instock","18":"shipping-taxable","19":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/ja\/wp-json\/wp\/v2\/product\/8637","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/ja\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/korea-transmission.com\/ja\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/ja\/wp-json\/wp\/v2\/comments?post=8637"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/ja\/wp-json\/wp\/v2\/media\/8611"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/ja\/wp-json\/wp\/v2\/media?parent=8637"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/korea-transmission.com\/ja\/wp-json\/wp\/v2\/product_brand?post=8637"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/korea-transmission.com\/ja\/wp-json\/wp\/v2\/product_cat?post=8637"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/ja\/wp-json\/wp\/v2\/product_tag?post=8637"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}