{"id":8631,"date":"2026-11-09T09:34:56","date_gmt":"2026-11-09T09:34:56","guid":{"rendered":"https:\/\/korea-transmission.com\/?post_type=product&p=8631"},"modified":"2026-11-10T03:40:54","modified_gmt":"2026-11-10T03:40:54","slug":"tl-311a-flail-mower-gearbox-ratio-13-replacement-for-comer-tl-311a-gearbox","status":"publish","type":"product","link":"https:\/\/korea-transmission.com\/id\/produk\/tl-311a-flail-mower-gearbox-ratio-13-replacement-for-comer-tl-311a-gearbox\/","title":{"rendered":"Gearbox TL-311A untuk Mesin Pemotong Rumput Tipe Flail dengan Rasio 1:3, Pengganti Gearbox Comer TL-311A"},"content":{"rendered":"

The TL-311A flail mower gearbox is a precision-engineered speed increasing unit built to serve as a direct bolt-on replacement for the original Comer TL-311A gearbox. Operating at a 1:3 ratio, this agricultural flail mower gearbox takes the tractor PTO input at 540 RPM and multiplies it to deliver the higher rotor speed that flail cutting heads demand. The housing is cast from GGG40 ductile iron, a grade chosen for its superior fatigue strength and shock resistance under repetitive impact loads. Internal gear teeth are hardened and ground to tight tolerances, keeping noise low while distributing load evenly across the tooth face. Both the input and output connections use the standard 1″3\/8 Z-6 splined profile, so the unit drops into existing drivelines without adapter sleeves or coupling modifications.<\/p>\n

Rated for 36.8 kW of continuous input power and 210 Nm of output torque, this heavy duty flail mower gearbox handles the full working range of mid-size tractor flail mower setups used in pasture reclamation, roadside verge maintenance, vineyard inter-row clearing, and general brush control. The sealed housing protects bearings and gears from dust, plant debris, and moisture ingress that would otherwise accelerate wear. Oil capacity sits at 1.2 litres of SAE 80W-90 gear lubricant (shipped dry), with the first drain recommended at 50 to 70 hours and subsequent changes every 500 operating hours. Whether you need a tractor flail mower gearbox for seasonal pasture work or a heavy duty unit running daily municipal contracts, the TL-311A provides proven reliability in a compact, field-serviceable package. If your current flail mower gear box is worn out or damaged, this unit delivers a fast, affordable path back to full productivity.<\/p>\n

\"Gearbox<\/p>\n

Parameter Teknis<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Model<\/strong><\/td>\nTL-311A \u00a0Flail Mower Gearbox 1:3<\/td>\n<\/tr>\n
Ganti Merek<\/strong><\/td>\nPendatang<\/td>\n<\/tr>\n
Detail Produk<\/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
Rentang Aplikasi<\/strong><\/td>\n\n
    \n
  • Various (agricultural) applications<\/li>\n
  • Flail Mowers<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
Perbandingan\u00a0<\/strong><\/td>\n1:3<\/td>\n<\/tr>\n
Connection 1 Outside Diameter inch and splines<\/strong><\/td>\n1\u20333\/8 Z-6<\/td>\n<\/tr>\n
Sambungan 2 Diameter Luar inci dan alur<\/strong><\/td>\n1\u20333\/8 Z-6<\/td>\n<\/tr>\n
Daya masukan maksimum<\/strong><\/td>\n36.8 kW<\/td>\n<\/tr>\n
Kecepatan Rotasi Input Maksimum<\/strong><\/td>\n540 r\/min<\/td>\n<\/tr>\n
Daya keluaran maksimum<\/strong><\/td>\n50 HP<\/td>\n<\/tr>\n
Torsi keluaran maksimum<\/strong><\/td>\n210 N\u00b7m<\/td>\n<\/tr>\n
Susunan Gigi Meningkat<\/strong><\/td>\n23-24<\/td>\n<\/tr>\n
Mengandung Minyak<\/strong><\/td>\nTIDAK<\/td>\n<\/tr>\n
Kapasitas oli maksimum<\/strong><\/td>\n1,2 L<\/td>\n<\/tr>\n
Interval Penggantian Oli Maksimum<\/strong><\/td>\n500 jam<\/td>\n<\/tr>\n
Minyak dengan Tingkat Viskositas SAE<\/strong><\/td>\n80W-90<\/td>\n<\/tr>\n
Bahan Perumahan<\/strong><\/td>\nCast iron GGG40<\/td>\n<\/tr>\n
Berat<\/strong><\/td>\n20.5 kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Kami telah menyelesaikan audit pemasok pihak ketiga dan verifikasi perusahaan yang didukung oleh SGS \/ T\u00dcV Rheinland. Verifikasi ini membantu pembeli meninjau identitas perusahaan, operasional bisnis, profil pemasok, dan kemampuan manufaktur secara umum. Laporan inspeksi khusus produk, dokumen material, atau catatan kepatuhan dapat diberikan sesuai dengan persyaratan pesanan.<\/p>\n

Jumlah Pesanan Minimum (MOQ):<\/strong>\u00a0Dapat diatur secara fleksibel berdasarkan jenis produk dan jumlah pesanan.<\/p>\n

Contoh:<\/strong>\u00a0Pelanggan baru dapat meminta 1\u20135 sampel dalam keadaan yang sesuai.<\/p>\n

Pesanan Campuran:<\/strong>\u00a0Penggabungan berbagai model didukung; jumlah total pesanan harus mencapai sekitar $1.500.<\/p>\n

Pesanan Kecil:<\/strong>\u00a0Pemesanan mulai dari 1-2 buah didukung, tetapi harga satuannya akan relatif lebih tinggi.<\/p>\n

Waktu Tunggu:<\/strong>\u00a010\u201325 hari kerja untuk suku cadang standar; 20\u201345 hari kerja untuk komponen yang disesuaikan; 45\u2013120 hari kerja untuk peralatan berbasis proyek.<\/p>\n

Syarat Perdagangan:<\/strong>\u00a0EXW, FOB, CIF, dan DAP umumnya didukung; ketentuan FCA, CFR, CPT, CIP, dan DDP dapat dinegosiasikan secara khusus.<\/p>\n

TL-311A Flail Mower Gearbox Dimensions<\/h2>\n

\"TL-311A \"TL-311A<\/p>\n

TL-311A Flail Mower Gearbox Advantages<\/h2>\n

1. Power Transmission and Speed Conversion
\nThis 540 RPM flail mower gearbox converts standard tractor PTO rotation into the higher drum speed and increased torque that flail rotors require for consistent chopping performance. The 1:3 increasing ratio delivers a stable output even when the cutting load fluctuates across uneven terrain, wet grass, or dense weed patches. By matching PTO input to rotor demand precisely, the gearbox prevents the speed drops that cause uneven cut quality and excessive fuel consumption in the field.<\/p>\n

2. Durability and Housing Protection
\nConstructed from cast iron GGG40, this heavy duty flail mower gearbox housing resists cracking under the repeated shock loads that flying stones and buried debris generate. The ductile iron construction absorbs vibration energy instead of transmitting it to the bearing seats, which extends the working life of every internal component. An anti-corrosion surface treatment on the exterior guards the housing against moisture and chemical exposure common in coastal or high-humidity agricultural regions.<\/p>\n

3. Ratio Options and Modular Output
\nThe 1:3 flail mower gearbox ratio provides the speed multiplication most mid-range flail drums require, while the standard 1″3\/8 Z-6 output spline adapts to a wide variety of drum shafts and knife carrier systems without custom machining. This modular approach means a single gearbox model covers multiple mower brands and rotor configurations, simplifying inventory for equipment dealers and reducing downtime for farmers who run several machines in their fleet.<\/p>\n

4. Sealing and Corrosion Resistance
\nReinforced lip seals on both input and output shafts keep lubricant inside the housing and block fine dust, chopped plant fibre, and water from reaching the bearings. The flail mower gearbox oil seal design uses double-lip construction with a grease-packed cavity between the lips, providing a secondary barrier when the primary seal face wears over time. This sealing system, combined with machined gasket surfaces on the housing split line, maintains protection across thousands of operating hours in abrasive conditions.<\/p>\n

5. Safety and Overload Protection
\nIn field conditions where flails strike solid objects such as rocks, fence posts, or buried metal, torque spikes can exceed normal operating loads by several times. This flail mower PTO gearbox is designed to work in conjunction with slip clutches and shear bolt mechanisms in the PTO driveline, which interrupt torque transmission before the gears or bearings sustain permanent damage. This layered protection approach preserves the gearbox investment and prevents costly driveline repairs that result from uncontrolled impact events.<\/p>\n

6. Direct Comer TL-311A Replacement
\nEngineered as a Comer flail mower gearbox replacement, the TL-311A shares identical mounting hole patterns, shaft dimensions, and gear specifications with the original Comer unit. No frame modifications, no adapter brackets, and no driveline changes are needed during installation. This drop-in compatibility reduces workshop time to under an hour in most cases and eliminates the engineering cost of retrofitting non-standard replacement parts onto existing equipment that was built around the Comer gearbox platform.<\/p>\n

\"Gearbox<\/p>\n

How Does a Flail Mower Gearbox Work?<\/h2>\n

Flail mower gearboxes are core transmission components in agricultural and municipal mowing machinery. Their primary job is to take rotational power from the tractor PTO, commonly running at 540 RPM, and transfer it to the flail rotor drum at the correct speed and torque to produce a clean, consistent cut across the full working width of the mower. The TL-311A accomplishes this through a precisely machined set of hardened steel gears housed inside a sealed cast iron enclosure, converting the input rotation into the output characteristics the cutting head needs.<\/p>\n

At the mechanical level, the flail mower gearbox functions as a speed increasing unit. The tractor PTO spins the input shaft, which carries a smaller driving gear. This driving gear meshes with a larger driven gear mounted on the output shaft. Because the gear pair follows a 1:3 ratio in the TL-311A, the output shaft rotates at three times the input speed, multiplying the 540 RPM PTO input to approximately 1,620 RPM at the rotor. At the same time, the torque relationship inverts: the output torque is roughly one-third of the input value, adjusted by the mechanical efficiency of the gear mesh. The 210 Nm maximum output torque specification accounts for real-world friction losses across the gear teeth, bearing surfaces, and oil seals.<\/p>\n

The flail rotor drum sits on the gearbox output shaft and carries dozens of individual flail blades or hammers attached on pivot pins along its length. As the drum spins, centrifugal force swings each blade outward to its fully extended position. When the blades contact vegetation, they shear through stems and leaves, then swing back on their pivots if they hit a solid object. This swinging action is what makes flail mowers safer and more forgiving than fixed-blade rotary cutters, and it is the flail mower gearbox assembly that supplies the sustained rotational energy to keep every blade moving at cutting speed even under heavy load.<\/p>\n

Inside the gearbox, lubricant plays a critical role. SAE 80W-90 gear oil fills the housing to a prescribed level, coating every gear tooth, bearing race, and seal lip during operation. The oil serves three purposes: it reduces metal-to-metal friction to prevent heat build-up, it carries away wear particles and micro-debris from the gear faces to the bottom of the sump, and it forms a protective film on polished surfaces that resists corrosion during storage periods when the mower sits idle between seasons. Maintaining the correct oil level and following the recommended flail mower gearbox oil change schedule is essential for achieving the designed service life of the unit.<\/p>\n

Flail mower gearboxes give operators precise control over mowing performance. By selecting the correct gearbox ratio, tractor operators can match rotor speed to the type of vegetation being cut. Light grass and pasture top-dressing work well at higher rotor speeds, while heavy brush and woody stems benefit from lower speeds with greater torque multiplication. The TL-311A’s 1:3 ratio sits in the most popular range for general-purpose flail mowing, covering everything from sports turf renovation to highway verge management and farm paddock maintenance.<\/p>\n

\"Flail<\/p>\n

Bidang Aplikasi<\/h2>\n
\n

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

The tractor flail mower gearbox powers the rotor drum to cut, shred, and mulch grass, weeds, and crop stubble across open pastures and hay fields. Shredded material is distributed evenly over the ground surface, accelerating decomposition and returning nutrients to the soil without the need for raking or baling. This application covers seasonal pasture top-dressing, post-harvest residue management, and paddock conditioning between grazing rotations.<\/p>\n<\/div>\n

\n

Brush and Bramble Control<\/h3>\n

High-torque flail mower gearbox assemblies handle the increased resistance of woody stems, blackberry canes, and dense scrub growth. The 210 Nm output torque of the TL-311A keeps the rotor at working speed even when the flails are processing material up to 40 mm in diameter. Land clearing contractors and forestry maintenance crews rely on this capability to reclaim overgrown paddocks, fire breaks, and fence lines without switching to dedicated mulcher equipment.<\/p>\n<\/div>\n

\n

Vineyard and Orchard Under-Row Work<\/h3>\n

Compact 3 point flail mower gearbox configurations fit the narrow-profile mowers used between vine rows and under tree canopies. The TL-311A’s moderate weight of 20.5 kg and standardised mounting pattern allow integration with offset mower frames that reach beneath the crop line without disturbing root zones. Vineyards, olive groves, and citrus orchards depend on this type of under-row management to control weed competition and reduce pest habitat.<\/p>\n<\/div>\n

\n

Roadside and Municipal Mowing<\/h3>\n

Municipal works departments and highway maintenance contractors put flail mower gearboxes through punishing duty cycles, running six to eight hours daily across gravel shoulders, drainage ditches, and median strips where hidden debris is unavoidable. The sealed GGG40 housing and reinforced seals of the TL-311A resist the constant bombardment of stones, broken glass, and road grit that would compromise lighter units within a single season of roadside operation.<\/p>\n<\/div>\n

\n

Sports Turf and Amenity Grounds<\/h3>\n

Golf courses, sports fields, and public parks use flail mowers to produce a fine, even cut finish that cylinder mowers struggle to maintain on rough ground. The agricultural flail mower gearbox<\/strong><\/a> supplies the consistent rotor speed needed for a uniform mulch without clumping. Because flail-cut debris is finely chopped, it settles into the turf canopy quickly, eliminating the need for collection and disposal that adds cost and labour to large-area amenity mowing contracts.<\/p>\n<\/div>\n

\n

Slope and Embankment Mowing<\/h3>\n

Hydraulic-arm flail mowers equipped with PTO-driven gearboxes work steep embankments, dam faces, and retention pond banks where conventional mowers cannot operate safely. The flail mower right angle gearbox configuration of the TL-311A transfers power through a 90-degree turn, which suits the articulated boom layouts used for reaching over guardrails and down slopes. Maintaining vegetation on these surfaces prevents erosion and satisfies regulatory requirements for waterway and infrastructure setbacks.<\/p>\n<\/div>\n

\n

Cover Crop and Green Manure Termination<\/h3>\n

Organic and regenerative farming systems use flail mowers to terminate cover crop stands before planting the cash crop. The flail mower gearbox drives the rotor at a speed that chops plant material into small pieces and lays it flat as a surface mulch, suppressing weed germination and conserving soil moisture. The TL-311A’s reliable torque output ensures even termination across heavy cover crop stands of rye, clover, or vetch without stalling the PTO driveline.<\/p>\n

\"Flail<\/p>\n

How to Install the TL-311A Flail Mower Gearbox<\/h2>\n

1. Prepare the Mower and Disconnect the PTO
\nPark the tractor on level ground, lower the flail mower to a stable resting position, and shut off the engine. Engage the parking brake and disconnect the PTO driveline shaft from the existing gearbox input. If the mower has a hydraulic offset arm, lock it in the centred position. Remove any debris buildup around the gearbox mounting area to expose the bolt heads clearly and prevent contamination from entering the new unit during the swap.<\/p>\n

2. Lepaskan Gearbox Lama
\nDrain the remaining oil from the old gearbox into a suitable container before unbolting. Remove the mounting fasteners that secure the gearbox to the mower frame and the output connection to the rotor drum. Support the old unit with a jack or block while removing the last bolts, as the 20+ kg weight can make handling awkward at an angle. Keep all original fasteners, spacers, and shims for reference during the new installation.<\/p>\n

3. Inspect the Mounting Surface and Driveline
\nBefore installing the replacement flail mower gearbox, examine the mower frame mounting pad for cracks, corrosion, or distortion. Clean the mating surface with a wire brush or scraper to remove old gasket material and paint flakes. Inspect the PTO driveline shaft splines and the rotor drum connection for wear or damage. Worn splines on the driveline or drum carrier will cause vibration and accelerated wear on the new gearbox shafts if not addressed at this stage.<\/p>\n

4. Position the New TL-311A Gearbox
\nLift the new TL-311A flail mower gearbox into position on the mower frame, aligning the mounting bolt holes with the frame pad. The Comer-compatible bolt pattern means holes should line up without reaming or drilling. Insert two guide bolts hand-tight first to hold the gearbox in alignment while you position the remaining fasteners. Confirm that the output shaft spline engages the rotor drum carrier fully before tightening any bolts to their final torque specification.<\/p>\n

5.Torque the Mounting Bolts
\nTighten all mounting bolts in a cross-pattern sequence to the torque value specified for the fastener grade and thread size. Even clamping force prevents the housing from distorting under load, which would misalign the gear mesh and void the designed bearing preload. Use a calibrated torque wrench rather than relying on feel, and apply thread-locking compound if specified. Re-check torque after the first five hours of operation, as initial settling of gasket surfaces can reduce bolt tension.<\/p>\n

6. Reconnect the PTO Driveline Shaft
\nSlide the PTO driveline shaft onto the gearbox input spline and secure it with the locking collar or snap ring. Check that the driveline shaft length and operating angles fall within the manufacturer’s recommended limits. Excessive angles cause universal joint binding and accelerate cross-bearing wear, while a shaft that is too short can separate under articulation. Grease all universal joints and sliding spline sections before first use to prevent dry-start damage to the driveline.<\/p>\n

7. Fill with Gear Oil and Run In
\nThe TL-311A ships without oil. Fill through the top plug port with 1.2 litres of SAE 80W-90 gear oil until the level reaches the lower edge of the fill hole. Replace the plug securely and wipe away any spilled oil. Start the tractor and engage the PTO at low RPM for two to three minutes, listening for unusual noise or vibration. Gradually bring the PTO up to 540 RPM and run the mower unloaded for ten minutes. Check for oil leaks at every seal and gasket joint before beginning field work.<\/p>\n

\"Gearbox<\/p>\n

How to Choose the Right Gearbox for Flail Mower<\/h2>\n

1. Start With Your Tractor and Mower Specifications<\/strong>
\nBefore selecting a flail mower gearbox replacement, collect the core operating data: tractor horsepower, PTO power and speed, mower working width, required rotor RPM, input and output shaft specifications, and existing gearbox model or part number. Two tractors with similar power ratings may still need different gearbox configurations because mower width, flail count, and rotor diameter affect the actual load on the gearbox. Provide as much detail as possible when requesting a recommendation.<\/p>\n

2. Sesuaikan Transmisi dengan Tenaga Traktor<\/strong>
\nTractor horsepower is a useful reference, but the gearbox must be matched to the actual power delivered through the PTO and the load generated by the mower under working conditions. An undersized gearbox will overheat, wear bearings prematurely, and fail early. An excessively large gearbox adds unnecessary weight and cost. When asking for a recommendation, provide tractor power, PTO information, mower width, and the type of vegetation you normally cut rather than horsepower alone.<\/p>\n

3. Konfirmasi Kecepatan PTO<\/strong>
\nPTO speed is one of the most important specifications for a flail mower PTO gearbox. Most agricultural flail mowers use a standard 540 RPM PTO input, but some larger models operate at 1000 RPM. Before selecting a gearbox, confirm the PTO input speed, the gearbox rated input speed, the required output speed, and the rotation direction. Two gearboxes with identical external dimensions may produce very different rotor speeds if their internal ratios differ, so always verify the speed specification.<\/p>\n

4. Pilih Rasio Gigi yang Tepat<\/strong>
\nThe flail mower gearbox ratio determines the relationship between input and output speed. Gear Ratio = Input Speed \/ Output Speed. The TL-311A’s 1:3 ratio is the most common choice for general-purpose flail mowing. However, the final ratio should also account for rotor diameter, flail configuration, and the type of material being cut. Higher rotor speed is not always better; heavy brush and dense vegetation may benefit from a lower ratio that delivers more torque to the cutting head.<\/p>\n

5. Consider Mower Working Width<\/strong>
\nWorking width directly affects gearbox load. A narrow flail mower on a compact tractor places less demand on the drivetrain than a wide implement running under the same PTO conditions. As working width increases, more flails engage vegetation simultaneously, raising the total resistance the gearbox must overcome. The gearbox, rotor, shafts, and PTO driveline should be evaluated as one transmission system rather than individually, and the actual mower width must be communicated when selecting a gearbox.<\/p>\n

6. Periksa Kompatibilitas Poros dan Spline<\/strong>
\nEven when power and ratio are correct, the gearbox cannot be installed if the shaft configuration does not match the machine. Confirm input shaft diameter, output shaft diameter, spline specification, keyway dimensions, shaft length, shaft orientation, and rotation direction. For OEM or replacement projects, sending technical drawings, photographs of the existing gearbox, or the original model number speeds up the matching process considerably and reduces the risk of ordering an incompatible unit.<\/p>\n

7. Verifikasi Dimensi Pemasangan<\/strong>
\nA gearbox with the correct ratio and power rating may still be unsuitable if the mounting footprint does not match the mower frame. Before ordering, confirm the mounting hole pattern, bolt circle diameter, housing dimensions, input and output shaft positions, installation direction, and available clearance around the gearbox location. The TL-311A uses the same bolt pattern as the original Comer TL-311A, which guarantees a direct fit on all mowers designed for that gearbox platform.<\/p>\n

\"Flail<\/p>\n

Flail Mower Gearbox vs. Rotary Tiller Gearbox<\/h2>\n

Apa Itu Gearbox Mesin Pemotong Rumput Flail?<\/h3>\n

A flail mower gearbox is a mechanical transmission unit that transfers power from the tractor PTO or engine to the flail rotor, maintaining consistent cutting performance across varying vegetation types and terrain conditions. The internal gear set regulates speed and torque to match the specific requirements of the cutting operation, while the heavy-duty construction of the housing, shafts, and bearings provides the reliability needed for thousands of hours of field service. Flail mower gearboxes typically operate as speed increasing units, multiplying PTO RPM to the higher rotor speeds that flail cutting heads need for clean, efficient mulching.<\/p>\n

Keunggulan Gearbox Mesin Pemotong Rumput Flail<\/h4>\n