TL-310J Flail Mower Gearbox Ratio 1:3 Replacement for Comer TL-310J Gearbox
The TL-310J flail mower gearbox with a 1:3 ratio is a purpose-built speed-increasing unit that serves as a direct replacement for the Comer TL-310J gearbox. Designed to transfer the tractor’s PTO power into the high-speed rotation needed by flail mower drums, this agricultural flail mower gearbox converts a 540 RPM input into a multiplied output through precision-matched spur gears in a 21-22 arrangement. This gearbox is well suited for a broad range of tasks: clearing overgrown pastures, mulching crop residues after harvest, maintaining roadside verges, and grooming under-row vegetation in vineyards and orchards.
The TL-310J flail mower gearbox with a 1:3 ratio is a purpose-built speed-increasing unit that serves as a direct replacement for the Comer TL-310J gearbox. Designed to transfer the tractor's PTO power into the high-speed rotation needed by flail mower drums, this agricultural flail mower gearbox converts a 540 RPM input into a multiplied output through precision-matched spur gears in a 21-22 arrangement. The housing is cast from GGG40 ductile iron, a material chosen for its superior impact resistance and vibration damping compared to standard gray iron or aluminum. Inside, the gear teeth are case-hardened and ground to tight tolerances, keeping noise low while handling input torques up to 420 N·m. Both the input and output shafts carry 1"3/8 Z-6 splined connections, matching the most common tractor PTO standard worldwide. At 18 kg, the unit is compact enough for mid-range flail mowers yet strong enough for sustained field operations.
This Comer flail mower gearbox replacement is well suited for a broad range of tasks: clearing overgrown pastures, mulching crop residues after harvest, maintaining roadside verges, and grooming under-row vegetation in vineyards and orchards. Because it shares the exact mounting pattern and shaft dimensions of the original Comer TL-310J, operators can swap it onto existing mower frames without machining new brackets or adapters. The gearbox ships without oil so users can fill it with the specified 80W-90 gear oil (0.8 L capacity) at startup, carry out the initial oil change between 50 and 70 operating hours, and then follow the 500-hour service interval. For farms and municipal fleets that depend on uninterrupted mowing, keeping a spare flail mower gearbox assembly on hand avoids costly downtime during peak seasons.
Tekniset parametrit
| Malli | TL-310J Flail Mower Gearbox 1:3 |
| Vaihda merkki | Tulija |
| Tuotetiedot |
|
| Käyttöalue |
|
| Suhde | 1:3 |
| Connection 1 Outside Diameter inch and splines | 1"3/8 Z-6 |
| Liitäntä 2 Ulkohalkaisija tuumaa ja urat | 1"3/8 Z-6 |
| Suurin tuloteho | 22,1 kW |
| Max. input torque | 420 N·m |
| Suurin tulon pyörimisnopeus | 540 rpm |
| Maks. lähtöteho | 30 hv |
| Suurin lähtömomentti | 126 N·m |
| Vaihteistojärjestelyn lisääminen | 21-22 |
| Sisältää öljyä | Ei |
| Suurin öljykapasiteetti | 0.8 L |
| Öljynvaihtoväli (maks.) | 500 tuntia |
| Öljyn SAE-viskositeettiluokka | 80W-90 |
| Kotelon materiaali | Cast iron GGG40 |
| Paino | 18 kg |
Olemme suorittaneet kolmannen osapuolen toimittaja-auditoinnin ja yrityksen varmennuksen SGS / TÜV Rheinlandin tukemana. Tämä varmennus auttaa ostajia tarkistamaan yrityksen identiteetin, liiketoiminnan, toimittajaprofiilin ja yleisen valmistuskyvyn. Tuotekohtaisia tarkastusraportteja, materiaaliasiakirjoja tai vaatimustenmukaisuustietoja voidaan toimittaa tilauksen vaatimusten mukaisesti.
Minimitilausmäärä (MOQ): Joustava määritys tuotetyypin ja tilausmäärän perusteella.
Näytteet: Uudet asiakkaat voivat pyytää 1–5 näytettä sopivissa olosuhteissa.
Sekalaiset tilaukset: Eri mallien yhdistämistä tuetaan; tilauksen kokonaissumman on oltava noin $1 500.
Pienet tilaukset: Tilauksia 1–2 kappaleesta alkaen tuetaan, mutta kappalehinta on suhteellisesti korkeampi.
Läpimenoaika: 10–25 arkipäivää standardiosille; 20–45 arkipäivää räätälöidyille komponenteille; 45–120 arkipäivää projektipohjaisille laitteille.
Kauppaehdot: EXW-, FOB-, CIF- ja DAP-toimitusehtoja tuetaan yleensä; FCA-, CFR-, CPT-, CIP- ja DDP-ehdoista voidaan neuvotella erikseen.
TL-310J Flail Mower Gearbox Dimensions
Key Features of the TL-310J Flail Mower Gearbox
1. Voimanottoakselin liitäntä ja ura-akselin standardit
Both the input and output shafts of this tractor flail mower gearbox feature the 1"3/8 Z-6 splined connection, which is the most widely adopted PTO standard across North America, Europe, and Australia. This matched spline profile ensures solid mechanical engagement between the tractor driveline and the mower drum shaft, reducing play and minimizing spline wear. Correct sizing at both ends keeps stress evenly distributed across all six spline teeth, which lowers the risk of premature fatigue cracking during heavy loads.
2. Optimized 1:3 Gear Ratio for Flail RPM
The 1:3 speed-increasing flail mower gearbox ratio triples the 540 RPM PTO input to approximately 1,620 RPM at the output shaft, putting the flail drum squarely in the ideal cutting range for grass, weeds, and light brush. The 21-22 gear arrangement delivers this multiplication through a single-stage helical pair, keeping mechanical losses low and output torque at a solid 126 N·m. This ratio matches the factory specification of the Comer TL-310J, so operators switching to this unit will see identical drum speed and cutting behaviour.
3. Sealing and Corrosion Resistance
Field conditions are hard on gearboxes. Dust, crop chaff, moisture, and occasional stone strikes are daily realities for any heavy duty flail mower gearbox. The TL-310J uses reinforced lip seals at each shaft exit and a breather valve on the housing to equalize internal pressure without admitting water or debris. The GGG40 ductile iron housing itself resists corrosion better than aluminum alternatives, and its surface finish can accept paint or powder coating for additional protection in coastal or high-humidity climates where salt air accelerates metal degradation.
4. Field Serviceability
Routine maintenance on the TL-310J requires nothing more than a socket set and a drain pan. Accessible oil-fill, oil-level, and oil-drain plugs are positioned where you can reach them without removing the gearbox from the mower frame. The oil capacity is just 0.8 L, and the recommended flail mower gearbox oil grade is a common SAE 80W-90 available at any farm supply store. A breather plug and inspection cover let you check for moisture contamination or metal particles without a full teardown, reducing your flail mower gearbox repair costs over the life of the unit.
5. GGG40 Ductile Iron Housing
Unlike standard gray cast iron, GGG40 ductile iron contains spheroidal graphite nodules that give the housing much greater tensile strength and elongation before failure. This matters on a flail mower because flying stones and debris constantly slam into the housing. GGG40 absorbs those impacts without cracking, which is a common failure point on lower-grade flail mower gearbox parts. The material also dampens gear-mesh vibration, making the unit quieter and reducing fatigue on mounting bolts and the surrounding mower frame over thousands of operating hours.
6. Built-in Free Wheel Mechanism
The TL-310J comes with a free wheel (overrunning clutch) feature that protects both the gearbox internals and the tractor driveline. When the operator disengages the PTO, the flail drum's rotational inertia can back-drive torque through the gear train. The free wheel decouples that reverse load, preventing shock damage to the gears, flail mower gearbox bearings, and the PTO shaft's universal joints. This feature is standard on the original Comer unit and is carried over identically in this flail mower gearbox replacement, so the swap introduces no change to driveline protection.
How Does the TL-310J Flail Mower Gearbox Work
A flail mower PTO gearbox is a mechanical speed multiplier that sits between the tractor's power take-off and the mower's cutting drum. In the TL-310J, rotational power enters through the input shaft at the tractor's standard 540 RPM. That shaft carries a smaller driving gear (pinion) with 21 teeth that meshes with a larger driven gear of 22 teeth. Because this is a speed-increasing (step-up) unit with a 1:3 overall ratio, the gear geometry multiplies the shaft speed by three, sending approximately 1,620 RPM to the output shaft. As the speed goes up, the available torque goes down proportionally: the 420 N·m input torque becomes roughly 126 N·m at the output, which is still more than enough to keep flail knives spinning through dense grass, weeds, and light woody stems.
The gear pair inside the TL-310J is precision-ground from alloy steel that has been case-hardened to increase surface hardness while keeping the core tough. This combination lets the teeth resist pitting and wear under repeated loading cycles, which is critical for a 540 RPM flail mower gearbox that may run eight or more hours a day during peak mowing season. The gears run in an oil bath of SAE 80W-90 gear lubricant, which forms a thin hydrodynamic film between the meshing tooth surfaces, removes heat from the contact zone, and flushes away any fine metal particles generated by normal wear. Oil level should be checked before each shift, and the recommended change interval is every 500 operating hours or once a year, whichever comes first.
Surrounding the gear train is the GGG40 ductile iron housing, which serves multiple roles: it holds the shafts in precise alignment through press-fit bearings, it contains the lubricant, and it shields internal components from the dust, mud, and debris thrown up during mowing. Shaft seals at each opening prevent oil from leaking out and contaminants from getting in. A breather valve near the top of the housing allows air pressure to equalize as the oil heats up during operation, preventing seal blowout. The free-wheel mechanism on the input side acts like a one-way clutch: it allows the tractor to drive the drum forward but lets the drum coast to a stop on its own when PTO power is cut, shielding the entire driveline from reverse torque spikes.
In practice, this means the operator engages the PTO, and within seconds the flail drum reaches full operating speed. The flail mower gear box maintains consistent output regardless of minor load fluctuations caused by uneven terrain or varying vegetation density. When the mower hits a thick patch of brush, the torque reserve at the input side absorbs the spike and the drum speed recovers quickly. This steady power delivery is what separates a properly matched gearbox from an undersized one: undersized units bog down under load, overheat, and wear out their gears prematurely. By matching the original Comer TL-310J specifications exactly, this replacement gearbox keeps the entire mower system running within its designed operating envelope, delivering clean, even cuts season after season.
Sovellusalueet
Vegetation Shredding and Pasture Maintenance
The primary job of any flail mower gearbox is powering the drum to cut and mulch standing grass, weeds, and crop residues. On livestock farms, regular pasture mowing controls thistle and dock, encourages fresh regrowth, and breaks down cattle dung pats so nutrients return to the soil faster. The TL-310J's 1:3 ratio delivers the drum speed needed for a fine, even mulch that decomposes quickly instead of forming windrows.
Brush and Bramble Control
When vegetation goes beyond soft grass into woody stems, blackberry canes, and dense bracken, the gearbox faces higher momentary torque loads. The TL-310J's 420 N·m input torque rating and hardened gear teeth handle those spikes without overloading. A heavy duty flail mower gearbox like this one keeps the drum turning through material that would stall lighter units, making it a strong choice for land reclamation and clearing neglected fence lines.
Vineyard and Orchard Under-Row Work
Compact flail mowers fitted to narrow tractors keep the ground beneath vines and fruit trees clean without herbicide. The TL-310J's 18 kg weight and standard mounting dimensions fit mid-sized flail heads used in row-crop settings. Because the gearbox bolt pattern matches the Comer original, it drops into vineyard mower frames from European manufacturers without modification, an important factor where downtime during the growing season costs money.
Roadside and Municipal Mowing
Council and highway maintenance crews mow verges, median strips, and drainage channels thousands of kilometres per season. Those mowers hit stones, bottles, metal scraps, and other debris that slam back into the gearbox housing. The TL-310J's GGG40 ductile iron casing absorbs those impacts without cracking, while the sealed bearings and reinforced flail mower gearbox oil seal arrangement keeps contaminants out even in wet, muddy roadside conditions.
Stubble Management After Harvest
After cereal or oilseed harvest, the remaining stubble needs to be chopped and spread before the next tillage pass. Flail mowers do this faster and more uniformly than disc mowers, and the mulched residue breaks down quicker in the soil. The TL-310J's consistent output speed ensures uniform chop length across the full width of the mower, which helps with even residue decomposition and reduces the risk of slugs and disease in the following crop.
Golf Course and Sports Turf Grooming
Professional turf managers use flail mowers for rough areas, out-of-play zones, and semi-rough strips where a clean, non-scalped finish is required. The controlled drum speed provided by a flail mower right angle gearbox in the 1:3 ratio range produces an even cut height with minimal leaf tearing, which promotes healthier turf recovery. The quiet operation of a well-maintained gearbox also matters on courses where noise regulations apply during early morning mowing schedules.
Biomass and Green Waste Processing
Operators collecting cut material for composting or biogas feedstock need a consistent particle size. The 3 point flail mower gearbox in the TL-310J specification drives the drum at a steady speed that gives a predictable chop, even as the mower transitions between light grass and heavier plant stems. Uniform feedstock size improves fermentation efficiency in biogas digesters and speeds up composting in windrow systems, adding economic value beyond simple mowing.
Solar Farm and Utility Site Vegetation Control
Solar arrays, substations, and pipeline corridors require regular vegetation management to prevent shading, fire risk, and access obstruction. Flail mowers are preferred over rotary cutters on these sites because they do not throw large debris into panels or equipment. The TL-310J gearbox supports this work with its reliable output speed and shock-resistant housing, allowing contractors to mow around high-value infrastructure with confidence that the cutting drum will perform predictably.
TL-310J Flail Mower Gearbox Parts
Asuminen
The housing is the structural backbone of the entire flail mower gearbox assembly. Cast from GGG40 ductile iron, it provides the rigid framework that holds every internal component in precise alignment. The housing also acts as the primary heat sink, dissipating thermal energy generated by gear mesh friction and bearing loads. Its walls are thick enough to resist impact from stones and debris flung by the flail knives, and machined surfaces on the mounting faces ensure a flat, vibration-free connection to the mower frame.
Tuloakseli
The input shaft transfers rotational energy from the tractor's PTO through the driveline and into the gearbox. On the TL-310J, this shaft carries a 1"3/8 Z-6 splined end that slides into the PTO coupling. The shaft is machined from medium-carbon alloy steel, heat treated for a hard surface and a tough core. It runs on two tapered roller bearings that handle both radial and axial loads generated by the gear mesh, keeping the shaft stable even under peak torque conditions of 420 N·m.
Vaihdesarja
The gear pair is the heart of any flail mower PTO gearbox. In the TL-310J, a 21-tooth pinion on the input shaft meshes with a 22-tooth wheel on the output shaft in a speed-increasing configuration that achieves the 1:3 overall ratio. Both gears are case-carburised alloy steel with ground tooth profiles to minimise backlash and noise. The tooth geometry is optimised for smooth power transfer and long service life, even when the mower repeatedly hits heavy loads.
Laakerit
High-quality flail mower gearbox bearings support both shafts and absorb the radial and thrust loads produced by gear engagement. The TL-310J uses tapered roller bearings at each shaft station, selected for their high load capacity and tolerance of slight misalignment. These bearings run in the same oil bath as the gears, receiving continuous lubrication. Proper oil maintenance keeps bearing temperatures low and prevents premature spalling of the rolling elements, which is one of the most common failure modes in poorly maintained agricultural gearboxes.
Lähtöakseli
The output shaft drives the flail mower's drum at the amplified speed and adjusted torque. On the TL-310J, the output carries a 1"3/8 Z-6 splined end that connects to the drum hub or a coupling flange. The shaft is heat-treated to the same specification as the input shaft and is supported by its own pair of tapered roller bearings. Because the output side runs at three times the input speed, the bearing preload and lubrication film are particularly important to control heat and wear at this station.
Tiivisteet ja tiivisteet
Every shaft exit point on the TL-310J is fitted with a double-lip flail mower gearbox oil seal that retains lubricant inside the housing and blocks external contaminants. The sealing lips are made from a high-temperature nitrile rubber compound that withstands the heat generated during long mowing shifts. A flat gasket between the housing halves creates a leak-proof joint, and thread sealant on the drain and fill plugs prevents weeping. Keeping these seals in good condition is one of the simplest ways to extend gearbox life.
Asennusvaiheet
1. Prepare the Mower and Disconnect Power
Park the tractor on level ground, engage the parking brake, and shut off the engine. Disengage the PTO and wait for the flail drum to stop completely before approaching the mower. Lower the mower deck to the ground so it is stable and will not roll or shift during work. Disconnect the PTO driveshaft from the gearbox input by releasing the locking collar and sliding the shaft back toward the tractor. Lay the driveshaft aside on a clean surface.
2. Tyhjennä vanha vaihteistoöljy
Place a drain pan under the old gearbox and remove the drain plug with a socket wrench. Allow all oil to drain fully; tilting the mower slightly can help empty the housing. Inspect the drained oil for metal shavings, milky discoloration (water contamination), or a burnt smell, which may point to additional damage in the mower's bearings or belts. Once the oil is out, replace the drain plug loosely to prevent dirt from entering the housing during removal.
3. Remove the Mounting Bolts and Old Gearbox
Identify all bolts securing the old gearbox to the mower frame. On most flail mower designs, the gearbox is held by four to eight mounting bolts arranged around the housing flange. Use a breaker bar for any corroded or overtightened fasteners. Support the gearbox weight with one hand or a floor jack as you remove the final bolts so it does not drop. Carefully separate the gearbox from the mower frame, noting the position of any shims, spacers, or alignment dowels between the housing and the frame.
4. Inspect the Mower Frame Mounting Surface
With the old gearbox removed, clean the mounting surface on the mower frame with a wire brush or scraper. Remove any old gasket material, rust, or debris. Check that the bolt holes are not elongated from vibration wear. If any holes show wear, repair them before fitting the new unit, either by welding and re-drilling or by using oversize bolts with backing plates. A flat, clean mounting surface is essential for proper alignment and vibration-free operation of the new TL-310J gearbox.
5. Position and Bolt the New TL-310J Gearbox
Lift the new TL-310J into position against the mower frame. Because this unit is a direct replacement for Comer T-310A flail mower gearbox and TL-310J series, the bolt pattern should align without modification. Insert the mounting bolts hand-tight first, making sure any original shims or spacers are reinstalled in the same locations. Once all bolts are started, tighten them in a cross pattern to the torque value specified in your mower's service manual, typically 45 to 60 N·m for M12 bolts on agricultural equipment.
6. Fill with Gear Oil and Check Level
The TL-310J ships without oil. Remove the fill plug on the side of the housing and pour in SAE 80W-90 gear oil until the level reaches the bottom of the fill hole. The total capacity is 0.8 litres. Use a quality GL-5 rated gear oil from a reputable brand. After filling, replace the fill plug securely and wipe any spilled oil from the housing. The flail mower gearbox oil will need its first change between 50 and 70 hours of operation, after which the interval extends to every 500 hours.
7. Reconnect the PTO Driveshaft
Slide the PTO driveshaft onto the gearbox input shaft splines. The 1"3/8 Z-6 splined connection should engage smoothly; if the shaft resists, check that the splines are clean and apply a light coat of moly grease. Lock the coupling collar into place and verify it is fully seated. Check the driveshaft guard for damage and replace it if cracked. An unguarded PTO shaft is an extreme safety hazard and should never be operated, even for a short test run.
8. Test Run and Final Checks
Start the tractor and engage the PTO at low idle, then gradually bring RPM up to the rated 540. Listen for unusual noise such as grinding, whining, or knocking, which would indicate a misalignment or contamination inside the gearbox. Let the unit run for five minutes, then shut down and check for oil leaks around the seals, drain plug, and fill plug. Verify the mounting bolts have not loosened. Once confirmed, the mower is ready to return to service. Re-check oil level after the first two hours of cutting.
Common Faults and Solutions
Oil Leaking from Shaft Seals
Oil weeping or dripping around the input or output shaft typically indicates worn or damaged lip seals. Over time, dust and chaff abrade the seal lip, and heat hardens the rubber until it no longer maintains contact with the shaft surface. Replace the flail mower gearbox oil seal with the correct specification for the TL-310J (match the shaft diameter, bore diameter, and lip material). Before fitting a new seal, inspect the shaft surface for scoring or grooves; a worn shaft will destroy a new seal within hours. Light scoring can be corrected with a shaft repair sleeve.
Liiallinen melu tai vinkuminen käytön aikana
A gearbox that becomes noticeably louder than normal is usually telling you that gear teeth are wearing unevenly, bearing preload has shifted, or the oil level is low. Start by checking and topping up the oil. If the noise persists, drain the oil and inspect it for metal flakes or a silver colour, which indicates gear or bearing wear. Bearing failure produces a rumbling or growling sound, while gear damage causes a high-pitched whine or clicking. If caught early, a bearing replacement can save the gears. If left too long, both gears and bearings will need replacement.
Vaihteiston ylikuumeneminen
If the gearbox housing becomes too hot to hold your hand on (above roughly 80 degrees C), the unit is overheating. Common causes include insufficient oil, wrong oil grade, a blocked breather valve, or running the mower continuously in material too heavy for the gearbox rating. Verify the oil level and grade (SAE 80W-90 GL-5), clean or replace the breather, and review whether the cutting load exceeds the 22.1 kW input limit. Running the mower at a slower ground speed through heavy material reduces the load on the gearbox and allows heat to dissipate.
Vibration in the Driveline
Vibration that was not present before installing a new gearbox often points to a misalignment between the PTO shaft and the gearbox input. Check that the mounting bolts are fully tightened and that any shims or spacers from the original installation are in place. Verify that the PTO shaft operating angle is below 15 degrees. Worn or dry U-joints in the PTO shaft will also cause vibration; grease them or replace if the needle bearings feel rough when rotated by hand. An unbalanced flail drum from missing or broken flail knives can transmit vibration back through the gearbox as well.
Water Contamination in the Oil
A milky or cloudy appearance in the gear oil is a sure sign of water entry. This commonly happens when a damaged seal or a clogged breather allows rain or wash water to penetrate the housing. Water mixed with gear oil drastically reduces the lubricant's film strength, accelerating bearing and gear wear. Drain the contaminated oil immediately, flush the housing with clean gear oil, and refill with fresh SAE 80W-90. Then find and fix the entry point, whether it is a worn seal, a loose plug, or a cracked breather valve, before returning the mower to service.
Spline Wear on Input or Output Shaft
Spline wear shows up as a clicking or clunking sound when the PTO engages or when the drum load changes direction. It happens when the PTO shaft coupling is not greased regularly, or when the shaft fit is too loose, allowing rocking motion that hammers the spline teeth. Inspect both the gearbox shaft splines and the mating coupling. A small amount of wear is normal, but if the backlash (free play) exceeds 2 to 3 degrees, the coupling should be replaced, and the gearbox shaft may need professional inspection.
Vaihteiston hampaan rikkoutuminen
Sudden, severe impact loads, such as hitting a large rock or stump at full speed, can break a gear tooth outright. The broken tooth circulates through the oil bath and damages other teeth, bearings, and seals. If you hear a sudden metallic grinding noise, stop the PTO immediately and inspect the gearbox. A broken tooth cannot be field-repaired; the gear pair must be replaced as a matched set to maintain proper mesh and backlash. In many cases, it is more cost-effective to replace the entire flail mower gearbox with a new unit rather than sourcing individual gears and rebuilding.
Flail Mower Gearbox and Agricultural PTO Shaft
The flail mower gearbox and the maatalouden nivelakseli form a single power transmission chain that connects the tractor engine to the mower cutting drum. Neither component works without the other. The PTO shaft physically carries rotational energy from the tractor's power take-off stub to the gearbox input, while the gearbox converts that energy from the tractor's 540 RPM output into the higher speed the flail drum requires.
An agricultural PTO shaft for a flail mower is a mechanical driveline that transfers rotational power from the tractor's Power Take-Off to the mower's gearbox. A typical PTO shaft assembly consists of several core elements: two universal joints (U-joints) at either end to allow angular misalignment between the tractor and the implement, a telescoping tubular section that accommodates changes in distance as the mower lifts and lowers, and protective guards that enclose the spinning shaft to prevent entanglement. The splined connections at each end must match: on the tractor side, the shaft mates with the PTO stub (commonly 1"3/8 Z-6 for 540 RPM tractors), and on the implement side, it connects to the gearbox input shaft, which on the TL-310J is also 1"3/8 Z-6.
Correct sizing of the PTO shaft is a critical safety and performance issue. The shaft must be rated to handle the torque the tractor delivers at the PTO, which in the case of the TL-310J gearbox is up to 420 N·m at the input. An undersized shaft will twist, wear out its U-joints prematurely, or break under load. The operating angle between the tractor PTO stub and the gearbox input shaft also matters: U-joints work most efficiently at angles below 15 degrees. Angles beyond that increase vibration, accelerate joint wear, and can cause damaging speed fluctuations in the driveline. When the mower is in its working position, the PTO shaft should run as close to straight as possible. When the mower is raised for transport, the increased angle should still remain within the U-joint's rated range.
The telescoping section of the PTO shaft has its own requirements. It must never be compressed to minimum length or extended to maximum length during operation, because either extreme puts the splines or the cross bearings in a position where they cannot function properly. A general rule is to maintain at least one-third spline overlap at all times. The shaft guards, though often damaged or removed by operators in a hurry, are required by safety regulations in most countries and should always be intact and able to rotate freely around the spinning shaft. A missing or jammed guard can catch loose clothing and cause severe injury.
For the TL-310J flail mower gearbox, selecting the right PTO shaft means matching the spline profile (1"3/8 Z-6 at both ends for most 540 RPM setups), choosing a torque rating that exceeds 420 N·m, confirming the telescoping range covers the distance between the tractor PTO and the gearbox input in both working and raised positions, and verifying that the operating angles stay within the U-joint's limits. CMN Transmission offers matched PTO shafts designed to pair with our flail mower gearbox range, so buyers can source both components from a single supplier with guaranteed compatibility.
Flail Mower Gearbox vs. Rotary Cutter Gearbox
Mikä on ruohonleikkurin vaihdelaatikko?
A flail mower gearbox transmits power from the tractor's PTO or engine to the flail rotor while maintaining consistent cutting performance. The internal gear systems regulate speed and torque to suit different crop residues and terrain, while heavy-duty construction ensures long-term reliability. These gearboxes are typically speed-increasing units with ratios between 1:2 and 1:4, bringing the drum speed up to the 1,200 to 2,400 RPM range needed for flail knives to produce a clean, mulched finish.
Flail-leikkurin vaihdelaatikon edut
- Fine Mulching Output: The higher drum speed created by the speed-increasing gearbox ratio chops vegetation into small pieces that decompose quickly, returning nutrients to the soil faster than rotary-cut material left in large clumps or windrows.
- Reduced Debris Throw: Flail mowers contain cut material within the deck far more effectively than open rotary cutters, so a properly geared flail unit is safer near roads, buildings, vehicles, and bystanders, making it the preferred choice for municipal mowing contracts.
- Even Cut Quality: The combination of high drum RPM and individually swinging flail knives produces a more level finish than a rotary blade, which tends to push grass over before cutting it, especially when dull.
- Forgiving on Uneven Ground: Flail mowers follow ground contours better than rigid rotary cutters because the individual flails can retract on contact with a rise, reducing scalping and making the gearbox less prone to sudden impact loads from hitting a ridge or mound.
Flail-leikkurin vaihdelaatikon sovellukset
- Pasture and Grassland Management: Regular mowing to control weed seed heads, distribute livestock dung, and encourage palatable regrowth across grazing paddocks of all sizes.
- Vineyard and Orchard Floor Care: Under-row flail mowing as a chemical-free alternative to herbicide strips, keeping root zones clear without damaging trunks or wires.
- Roadside and Verge Maintenance: Municipal crews use flail mowers for safety-critical vegetation management along highways, cycling paths, and drainage channels.
- Crop Residue Chopping: After cereal or oilseed harvest, flail mowing breaks up stubble for faster decomposition and easier incorporation during the next tillage pass.
Mikä on pyörivän leikkurin vaihdelaatikko?
A rotary cutter gearbox is an essential component in rotary cutters, commonly used for mowing or trimming tall grasses, weeds, and other vegetation. Built to withstand high torque and shock loads, it consists of precisely engineered gears arranged for smooth power transmission and effective speed reduction. The input shaft connects to the tractor's PTO, and rotational power transfers to the rotary cutter blades through the output shaft. Unlike flail mower gearboxes, rotary cutter units are usually speed-reducing, bringing tractor PTO speed down to a lower blade RPM suited for heavy cutting.
Pyörivän leikkurin vaihdelaatikon edut
- High Torque for Thick Material: The speed-reducing ratio of a rotary cutter gearbox delivers substantially more torque to the blades, which is what you need to slice through saplings, dense scrub, and heavy brush that would stall a flail unit.
- Simpler Blade System: Rotary cutters use one or two large blades that are easy to sharpen or replace, making field maintenance faster and requiring fewer spare parts than a drum with dozens of individual flail knives.
- Wide Cutting Swath: Rotary cutters are available in widths up to 4.5 metres and beyond, covering large areas quickly when finish quality is secondary to speed and clearing ability.
- Lower Initial Cost: The gearbox and cutter assembly for a rotary mower are generally less expensive to purchase and set up than a comparable-width flail mower, making them popular on operations where a fine finish is not the priority.
Pyörivän leikkurin vaihdelaatikon sovellukset
- Grass Cutting and Residue Shredding: Drive rotary blades for mowing or chopping crop residues; blade speed (via gearbox ratio) affects particle size for field return or livestock feed use.
- Brush and Woody-Stem Clearing: High-torque gearboxes handle heavier loads when cutting shrubs, brambles, or small saplings on neglected land or forestry edges.
- Stubble Management and Field Prep: Used with cutting attachments to clear standing stubble before tillage or planting, especially on large broadacre farms.
- Orchard and Vine Alley Work: Low-profile or compact rotary cutter designs enable cutting in narrow rows and constrained spaces between tree trunks and vine posts.
Vertailutaulukko:
| Ominaisuus | Leikkurin vaihdelaatikko | Pyörivän leikkurin vaihdelaatikko |
|---|---|---|
| Vaihteistotyyppi | Speed increasing (e.g., 1:3) | Speed reducing (e.g., 1:1.47) |
| Lähtönopeus | 1,200 - 2,400 RPM | 300 - 540 RPM |
| Lähtömomentti | Lower (speed traded for RPM) | Higher (speed traded for torque) |
| Cutting Method | Spinning drum with individual flail knives | Large single or dual blades |
| Leikkauslaatu | Fine, even mulch | Coarse chop |
| Debris Projection | Minimal (contained in deck) | Significant (open discharge) |
| Heavy Brush Capability | Moderate (light to medium brush) | High (thick brush and saplings) |
| Ground Following | Excellent (flails retract) | Limited (rigid blade) |
| Typical PTO Input | 540 kierrosta minuutissa | 540 kierrosta minuutissa |
| Best Suited For | Pasture, turf, roadside, residue mulching | Land clearing, heavy brush, large area rough mowing |
|  |
Why Choose CMN Transmission's Flail Mower Gearboxes?
Korea CMN Transmission Co., Ltd. perustettiin vuonna 2000, ja se sijaitsee Sandan-ossa, Danwon-gussa, Ansan-si'ssa, Gyeonggi-dossa, Koreassa. Yli 100 tehtaan työntekijän voimin CMN Transmission on omistautunut maatalousvaihteistojen tutkimukseen, kehitykseen, valmistukseen, myyntiin ja huoltoon. Viimeisten kahden vuosikymmenen aikana CMN Transmission on kasvanut luotettavaksi toimittajaksi maailmanlaajuisesti maatalousvaihteistoteollisuudessa, ja se vie tuotteitaan yli 60 kohteeseen maailmanlaajuisesti.
Our product range covers 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 covering nearly one thousand specifications. These products serve grain harvesting equipment, forage machinery, mowers, balers, rakes, rotary tillers, fertilizer spreaders, sprayers, feed mixers, silage machines, combine harvesters, and many other agricultural applications.
Beyond gearboxes, our product line includes PTO shafts, U-joints, yokes, tubes, torque limiters, covers, adapters, couplings, bearings, blades, chains, and sprockets. With annual production exceeding 500,000 units, CMN Transmission consistently delivers reliable performance and long-term durability for global OEMs and distributors. All of our products are manufactured under CE and ISO 9001 certified management systems, ensuring consistent quality and dependable performance across every unit that leaves our factory. Our products are exported to the United States, Canada, Mexico, Brazil, Argentina, France, Germany, Italy, Spain, the United Kingdom, Russia, China, India, Thailand, Vietnam, Turkey, Australia, and New Zealand, with extensive experience providing technical solutions for global agricultural machinery partners.
When you choose CMN Transmission for your flail mower gearbox replacement needs, you gain access to a manufacturer with genuine production capability, not just a trading company reselling someone else's product. Every gearbox we supply is produced in our own facility, tested against the original OEM specifications, and backed by our technical support team. We maintain inventory of fast-moving models like the TL-310J so that orders can ship promptly, and we support custom production based on your drawings and specifications for agricultural gearboxes, PTO shafts, and various agricultural machinery components.
Whether you are an OEM building flail mowers, a distributor stocking flail mower gearbox parts, or a farmer looking for a cost-effective flail mower gearbox for sale to get your mower back in the field, CMN Transmission has the product, the production capacity, and the technical knowledge to support your operation. Contact us today for pricing, lead times, and technical assistance on any gearbox in our range.
Usein kysytyt kysymykset
Q: Is the TL-310J a direct bolt-on replacement for the Comer TL-310J flail mower gearbox?
A: Yes. The TL-310J is engineered as a direct bolt-on Comer flail mower gearbox replacement. It shares the same housing dimensions, mounting bolt pattern, shaft spline profiles (1"3/8 Z-6 on both input and output), gear ratio (1:3), and free wheel specification as the original Comer unit. You should not need any adapter plates, custom brackets, or shaft modifications to install it on mowers that originally used the Comer TL-310J gearbox.
Q: What type and grade of oil does this flail mower gearbox need?
A: Fill the TL-310J with SAE 80W-90 gear oil meeting at least the GL-5 performance level. The total flail mower gearbox oil capacity is 0.8 litres. Use a quality mineral or synthetic gear oil from any reputable brand. Avoid mixing different oil types. For extremely cold operating environments (below minus 20 degrees C), a synthetic 75W-90 GL-5 oil may provide better cold-start lubrication, but 80W-90 is correct for the vast majority of working conditions.
Q: How often should I change the oil in my flail mower gearbox?
A: Perform the first oil change between 50 and 70 operating hours to flush out any manufacturing debris and initial wear particles. After that, change the oil every 500 operating hours or at least once per year, whichever comes first. If the mower operates in particularly dusty or wet conditions, or if you notice the oil looks dark or milky before the interval is up, change it sooner. Always check the oil level before each shift.
Q: Can I use this gearbox on a 3-point hitch flail mower?
A: Absolutely. The TL-310J is compatible with 3 point flail mower gearbox applications as long as the mower was originally equipped with a Comer TL-310J or a gearbox with the same mounting pattern and shaft specifications. Most European and North American manufactured 3-point hitch flail mowers in the 1.2 m to 2.0 m width range use gearboxes in this size class. Verify your mower's existing gearbox model and mounting dimensions against the TL-310J specification sheet before ordering.
Q: What is the maximum tractor HP this gearbox can handle?
A: The TL-310J is rated for a maximum input power of 22.1 kW, which equates to approximately 30 HP at the PTO. This means it is suited for tractors delivering up to 30 PTO horsepower to the implement. Running a gearbox on a tractor that exceeds its power rating will overload the gears and bearings, leading to premature failure. If your tractor produces significantly more than 30 PTO HP, consider a larger gearbox model from our flail mower gearbox range.
Q: Does the TL-310J gearbox come pre-filled with oil?
A: No. Like most agricultural gearboxes shipped internationally, the TL-310J is supplied dry. This is standard practice because shipping regulations in some countries restrict the transport of oil-filled equipment, and it allows the end user to fill with their preferred brand and grade of SAE 80W-90 GL-5 gear oil. Be sure to fill the gearbox to the correct level before the first operation, and never run the unit dry even for a few seconds.
Q: What does the 1:3 gear ratio mean for flail mower performance?
A: The 1:3 flail mower gearbox ratio means the output shaft turns three times for every one turn of the input shaft. With a 540 RPM PTO input, the output delivers approximately 1,620 RPM to the flail drum. This speed range is optimal for most flail mowing tasks: it provides enough tip speed for a clean cut and fine mulch without overstressing the flail knives or generating excessive noise. The trade-off is lower torque at the output (126 N·m versus 420 N·m input), which is by design since flail drums need speed more than raw twisting force.
Q: Where can I buy replacement seals and bearings for this gearbox?
A: CMN Transmission supplies individual flail mower gearbox parts including oil seals, bearings, gaskets, and breather valves for the TL-310J. Because the gearbox uses standard industrial bearing sizes and metric seal dimensions, you can also source these parts from local bearing distributors by matching the part numbers. Contact our technical support team with your gearbox serial number, and we can provide the exact bearing and seal cross-references for your unit.
Q: Can this gearbox work with a 1,000 RPM PTO?
A: The TL-310J is designed and rated for a 540 RPM PTO input. Running it at 1,000 RPM would triple the output to approximately 3,000 RPM and would exceed the gearbox's bearing speed rating and gear tooth loading, creating a serious risk of failure. If your tractor uses a 1,000 RPM PTO, you need a gearbox specifically rated for that input speed. Contact us for gearbox models compatible with 1,000 RPM PTO applications.
Q: How do I know when my flail mower gearbox needs to be replaced?
A: Common signs that your flail mower gearbox is nearing the end of its service life include persistent oil leaks that cannot be fixed by seal replacement alone, excessive gear noise that worsens over time, visible metal particles in the drained oil, play or roughness in the output shaft when turned by hand, and cracking or distortion of the housing. If the cost of flail mower gearbox repair (new gears, bearings, seals, and labor) approaches or exceeds 60 to 70 percent of the price of a new unit, replacing the entire gearbox is usually the better economic decision.
Asiakasarvostelut
Robert Dawson, Livestock Ranch, United States
"We maintain about 300 acres of mixed pasture and hay ground in central Texas, and our old Comer gearbox finally gave out after twelve years. Ordered the TL-310J as a replacement and it bolted right up to our Maschio flail mower with zero modifications. The splines lined up perfectly with our existing PTO shaft. We're about 180 hours into it now and the gearbox runs smooth, stays cool, and the oil came out clean at the 65-hour change. For the price difference compared to the OEM Comer part, this was a no-brainer."
Michel Tremblay, Roadside Maintenance, Canada
"I manage roadside mowing contracts for three municipalities in southern Ontario and we go through gearbox parts regularly because the mowers hit everything from beer cans to concrete chunks. Bought two TL-310J units last spring for our Berti flail mowers. The cast iron housings have taken a beating and show no cracks. Delivery to Canada was about 18 days door to door, well packed, and their sales team answered my spline questions the same day. Will order again when we rotate our next set of mowers."
Alain Dupont, Vineyard Maintenance, France
"We use this gearbox on a 1.8m flail mower behind a 75 hp New Holland for grass and light scrub on our vineyard margins near Bordeaux. The 1:3 ratio gives us the drum speed we need for a fine mulch, and the finish quality is identical to what we had with the original Comer. One small point: the gearbox arrived without any mounting hardware, so we reused our old bolts. It would be helpful if a bolt kit was included. The gearbox itself, however, is solid and well finished."
Klaus Hartmann, Arable Farmer, Germany
"We run TL-310J gearboxes on two flail mulchers on our 450-hectare operation in Lower Saxony. After 400 operating hours, both units are performing exactly as specified. Oil consumption is zero, no leaks, no unusual noise. The 80W-90 oil holds up well even during long summer days of continuous mowing. Compared to the original Comer pricing through our local dealer, we saved over 35% per gearbox, and the quality feels equivalent."
Carlos Mendes, Cattle Ranch, Brazil
"I bought two TL-310J gearboxes for our flail mowers on the farm in Mato Grosso do Sul. They handle the tall guinea grass and brachiaria without any drama. The free wheel feature works well and I can hear the drum coast down smoothly when I disengage the PTO. Shipping to Brazil took about four weeks, which was fine since I ordered ahead of the mowing season. Good product for the money."
James Whitfield, Grounds Maintenance, United Kingdom
"We run a grounds maintenance business in the Midlands and needed a quick turnaround on a gearbox swap for one of our Kuhn flail mowers that was down mid-contract. CMN Transmission got the TL-310J to us in about two weeks, which was faster than our UK Comer distributor could source the OEM part. Installation took less than an hour. The 18 kg weight was easy for one person to handle. Now at about 250 hours with no issues. The oil level has not dropped and the housing still looks clean. Great backup option for a flail mower gearbox for sale at a competitive price."
Marco Ferretti, Olive Grower, Italy
"I replaced the original Comer gearbox on my Berti flail mower with the TL-310J. The mounting holes matched exactly and the 1"3/8 Z-6 spline fit was tight with no slop. After a full season of mowing olive groves, roughly 350 hours, the gearbox is still quiet and oil-tight. I drain the oil every winter and it comes out looking normal. For anyone in Italy looking for a Comer TL-310J replacement that actually fits, this one does the job."
Ben Caldwell, Beef Cattle, Australia
"I run 600 acres of improved pasture in the Hunter Valley and needed a gearbox swap on my flail topper. The TL-310J arrived well packed in a timber crate and the casting quality looked good. The only reason I'm giving four stars instead of five is that the instruction sheet was very basic. I would have liked torque specs for the mounting bolts and a clearer oil fill procedure. That said, the gearbox itself works exactly as advertised. I'm about 200 hours in with no leaks and no noise. Definitely a solid alternative to the Comer original."
Javier Ruiz, Orchard Maintenance, Spain
"We purchased three TL-310J gearboxes for our fleet of flail mowers in Andalusia. We maintain olive and almond orchards and the mowers run almost year-round. After the first season, all three units are in perfect condition. The 0.8-litre oil capacity makes changes quick, and the SAE 80W-90 is easy to find locally. The customer service team was responsive and even helped us confirm the correct mounting configuration before we ordered. Very satisfied."
Lisätiedot
| Muokannut | Yjx |
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