Description
Agricultural Gearbox Series
EP-T310A Flail Mower Gearbox
Replacement of Comer Code T-310A | SKU: EP-T310A
Model: RT1000 | Gear Ratio 1:3 | Max. Input Power 22.1 kW
1. Technical Specifications — EP-T310A Flail Mower Gearbox
| Parameter | Value / Specification |
|---|---|
| Model | EP-T310A (Replacement of Comer T-310A) |
| Type | RT1000 |
| Max. Input Power | 22.1 kW (≈ 30 HP) |
| Max. Input Torque | 420 Nm |
| Max. Output Torque | 12.6 daNm |
| Gear Ratio (Increasing) | 1 : 3 |
| Gear Ratio (Reducing) | 3 : 1 |
| Input Shaft (X) Specification | 1 3/8″ (6-spline) Z6 |
| Output Shaft (Z) Specification | Ø 33 h7 |
| Housing Material | Cast Iron GGG40 (Spheroidal Graphite) |
| Gear Arrangement | Increasing: 21 – 22 teeth |
| Input Connection Type | Splined (ISO 500 compatible) |
| Bearing Type | Tapered Roller Bearings |
| Seal Type | Double-Lip Oil Seal (NBR material) |
| Max. Oil Capacity | 0.8 L |
| Recommended Oil Grade | SAE 80W-90 GL-4/GL-5 |
| First Oil Change Interval | 50 – 70 operating hours |
| Subsequent Oil Change Interval | 500 – 700 hours or once per year |
| Operating Temperature Range | -20°C to +80°C |
| Overall Dimensions (L × W × H) | 280 mm × 185 mm × 225 mm (approx.) |
| Net Weight | 18 kg |
Note: All units ship without oil. Consult a qualified technician for power ratings at non-standard RPM inputs.
| Type | Ratio | Input r.p.m. | Input Power [kW] | Output Torque [daNm] | Weight [kg] | Input shaft |
| R | 3,0:1 | 540 | 13,2 | 71,6 | 18 | Z |
| M | 1:3,0 | 540 | 22 | 12,6 | X |
2. What Is the EP-T310A Flail Mower Gearbox?
The EP-T310A is a high-performance flail mower gearbox engineered as a direct replacement for Comer Code T-310A units. Designed to bridge the power from a tractor’s PTO shaft to the high-speed rotating blades of a flail mower, it delivers consistent, heavy-duty torque even under the most demanding cutting conditions. Whether you are managing overgrown pastures in Rio Grande do Sul, clearing roadsides in São Paulo state, or maintaining sugarcane buffer zones across Brazil’s Cerrado, this gearbox keeps your machine running reliably season after season.
At its core, the EP-T310A operates as an increasing-ratio gearbox with a 1:3 gear arrangement, meaning it takes a standard 540 RPM PTO input and steps up the output shaft speed to deliver the blade velocity needed for effective shredding of thick vegetation, brush, and crop residue. The cast iron GGG40 housing withstands the constant vibration and shock loads inherent to flail mowing, while precision-ground gears minimize noise and heat buildup during extended work sessions. The splined input connection (1 3/8″ Z6) conforms to international ISO standards, ensuring seamless compatibility with agricultural tractors from 18 HP up through mid-range utility machines.
This replacement flail mower gearbox is not just a drop-in spare part — it is a fully engineered upgrade path for operators whose original Comer gearbox has reached end of service life. Every unit is assembled to meet strict dimensional and performance tolerances so that installation requires no modification to your existing mower frame or PTO driveline. The result is less downtime in the field, lower total cost of ownership, and the confidence of running with a component built to the same duty cycle as the OEM specification. For farms, municipal contractors, and landscaping companies throughout Brazil and South America who depend on a working flail mower gearbox every day, EP-T310A represents the reliable new flail mower gearbox solution they can trust.
3. Five Key Product Advantages of heavy duty flail mower gearbox for tractor
High Torque Transmission Capacity
With a maximum input torque rating of 420 Nm and an output torque of 12.6 daNm, the EP-T310A is built for heavy-duty vegetation management. Whether tackling dense sugarcane stubble, thick pasture grass, or woody brush along fence lines, the gear train delivers power without slippage or overheating. The robust torque capacity means less strain on the tractor PTO shaft and a smoother overall drivetrain experience, reducing wear on connected components.
Cast Iron GGG40 Housing Durability
The housing is manufactured from GGG40 spheroidal graphite cast iron — a material chosen specifically for its excellent combination of tensile strength, vibration damping, and machinability. Unlike lighter alloy housings, GGG40 resists cracking under the sudden impact loads that occur when flail blades strike rocks or buried debris. This construction choice significantly extends service intervals and reduces the frequency of flail mower gearbox replacement, lowering the total lifecycle cost for professional operators.
Direct OEM-Compatible Replacement
Engineered to the exact mounting dimensions and shaft specifications of the original Comer T-310A, the EP-T310A requires zero frame modifications at installation. The splined input shaft (1 3/8″ Z6) and the 33 h7 output shaft match industry-standard connection points. This makes the EP-T310A the preferred choice for workshops and dealers in Brazil that need a reliable parts flail mower gearbox solution that fits without custom machining or adapter kits.
Sealed Lubrication System
The gearbox ships sealed dry with a maximum oil capacity of 0.8 liters, using SAE 80W-90 gear oil. The first oil change is recommended after just 50–70 operating hours to flush any manufacturing residues, with subsequent intervals at 500–700 hours or annually — whichever comes first. Double-lip shaft seals prevent contamination ingress and oil leakage even in muddy or wet conditions, a crucial reliability factor during Brazil’s rainy season harvest and post-harvest operations.
Smooth, Low-Noise Operation
Precision-cut helical or spur gears — depending on gear arrangement — are lapped and matched during assembly to minimize tooth-contact noise and eliminate the vibration harmonics that fatigue mounting frames over time. This results in quieter field operation, which matters both for operator comfort and for compliance with municipal noise ordinances applicable in Brazilian urban-fringe landscaping and park maintenance contracts. Smooth operation also translates to longer blade bearing life on the mower rotor itself.
4. Working Principle of the Flail Mower Gearbox
Understanding how a flail mower gearbox works clarifies why the mechanical design choices in the EP-T310A matter to long-term reliability. Power enters the gearbox at the input shaft, which is connected to the tractor’s power take-off (PTO) via an agricultural PTO shaft with a 1 3/8″ six-spline yoke. The tractor PTO typically rotates at either 540 RPM (standard) or 1000 RPM (high-speed) depending on the tractor model. For the T-310A design, 540 RPM is the rated input speed at which the 22.1 kW (approximately 30 HP) power rating applies.
Inside the cast iron housing, the gear train steps up rotational speed at a ratio of 1:3 — for every single rotation of the input shaft, the output shaft completes three full rotations. This speed increase is paired with a proportional reduction in torque at the output, but the design target is blade-tip speed rather than raw torque at the rotor, since flail cutting effectiveness depends on the kinetic energy imparted by fast-moving steel flails. The output shaft (33 h7 diameter) drives the mower’s rotor drum, which carries multiple free-swinging Y-blades or hammer blades on pivot pins.
When blades strike an obstruction — a stone, a root, or a clump of dense material — the free-pivot design allows individual blades to fold back momentarily, absorbing the shock without transmitting it through the entire drivetrain. This mechanical relief mechanism, combined with the shock-damping capacity of the GGG40 housing, is why a well-maintained pto flail mower gearbox can operate for hundreds of hours in rocky or debris-strewn fields. Proper oil lubrication ensures that gear tooth surfaces and bearing races remain separated by a thin film, preventing metal-to-metal contact that would otherwise accelerate wear. As long as oil level and quality are maintained according to the recommended SAE 80W-90 specification, the internal components continue to function well within their design life parameters.
5. Material Composition and Construction Quality
The choice of materials in a flail mower gearbox is not incidental — it is the single greatest predictor of field longevity. Every component of the EP-T310A has been selected through engineering analysis of the real load cycles experienced by agricultural mowing equipment in harsh working environments across South America, Europe, and beyond.
The outer housing is cast from GGG40 nodular cast iron, also known as ductile iron or spheroidal graphite iron. This alloy has a minimum tensile strength of 400 MPa and, more importantly for a mower gearbox, a high elongation to fracture value that gives it genuine toughness rather than brittleness. When the mower strikes a concealed obstacle — a rock, a stump root, or an embedded metal object — the GGG40 housing flexes fractionally rather than fracturing catastrophically. Field experience across years of Brazilian sugarcane and pasture maintenance has confirmed that housings made from grey cast iron (GG25 or similar) are significantly more prone to sudden cracking under the same duty cycle.
Internal gear wheels and pinions are manufactured from case-hardened alloy steel. The tooth flanks undergo surface hardening via carburizing or induction processes to a typical surface hardness of 58–62 HRC, while the core remains relatively soft and ductile for impact resistance. This combination — hard surface, tough core — is exactly what gear tooth design requires for long wear life without brittle fracture. Input and output shafts are machined from medium-carbon alloy steel bar stock, with tight h7 tolerances on bearing and seal seating diameters to guarantee correct fit without the shaft-fretting that accompanies loose tolerances. Tapered roller bearings are specified for both shaft positions because they handle the combined radial and axial loads generated by helical gear geometry. Sealing is provided by double-lip NBR (nitrile rubber) oil seals that retain lubricant and exclude water, dirt, and crop debris. NBR performs reliably across the temperature extremes encountered in Brazilian field conditions, from cool southern-state mornings to the intense heat of midday in the Cerrado.
6. Application Scenarios
The EP-T310A flail mower gearbox supports a wide range of agricultural, municipal, and land management operations. Below are the most common use environments where this gearbox delivers measurable value.
Pasture and Grassland Maintenance
Across Brazil’s vast cattle-farming regions — from Mato Grosso to Rio Grande do Sul — flail mowers equipped with the EP-T310A gearbox are used to manage pasture regrowth after grazing cycles. The gearbox’s 1:3 speed increase ensures blade tip velocities sufficient to mulch coarse pasture grasses and distribute the clippings evenly, promoting faster nutrient recycling and reducing the need for herbicide applications.
Roadside Vegetation Control
State and municipal highway departments throughout Brazil (DNIT and DAER-managed networks) regularly tender contracts for roadside vegetation clearing. The EP-T310A’s robust torque handling allows flail mowers to cut through mixed vegetation including small shrubs and woody stems without stalling, making it the right choice for contractors operating on federal and state road maintenance programs where uptime and cost-per-hectare are tightly monitored.
Sugarcane Field Buffer Zone Clearing
In sugarcane producing states such as São Paulo and Minas Gerais, landowners must manage vegetation in buffer zones around irrigated fields and waterways as part of compliance with Brazil’s Forest Code (Lei 12.651/2012). The EP-T310A-powered flail mower provides an efficient mechanical alternative to herbicide treatment in these environmentally sensitive areas, aligning with MAPA guidelines for integrated vegetation management.
Orchard and Vineyard Under-Row Management
Fruit orchards and wine vineyards in the Serra Gaúcha region (Rio Grande do Sul) and São Francisco Valley (Bahia / Pernambuco) use compact tractor-mounted flail mowers to manage grass cover under vine canopies and between fruit tree rows. The tow-behind flail mower gearbox design in many of these machines uses the same EP-T310A specification, benefiting from its compact housing and reliable output shaft geometry.
Municipal Park and Sports Ground Maintenance
Landscape contractors responsible for public parks, sports grounds, and green spaces in Brazilian urban municipalities rely on professional-grade mowing equipment year-round. The EP-T310A allows mowers operating as 3 point flail mower gearbox-equipped units to handle mixed turf conditions that ordinary rotary decks cannot manage efficiently, including areas with stones, sand contamination, and varied terrain levels.
Conservation and Habitat Management
Environmental conservation areas, power-line rights-of-way, and reservoir banks managed by IBAMA-licensed entities or power companies such as Eletrobras often require vegetation management that minimizes soil disturbance. Flail mowers, powered through gearboxes like the EP-T310A, shred rather than uproot, significantly reducing soil erosion risk compared to disc mulchers or bulldozing approaches, making them the preferred choice for sensitive ecosystem management.
7. Gearbox Oil Lubrication: Best Practices
A common question among operators is: what kind of oil goes in a flail mower gearbox? For the EP-T310A, the specified lubricant is SAE 80W-90 gear oil meeting API GL-4 or GL-5 standards. This viscosity grade provides adequate film thickness at the gear mesh contact zones across the operating temperature range of -20°C to +80°C that the gearbox may encounter during year-round use in Brazil’s varied climate zones.
Practical lubrication management involves five key habits. First, check oil level before each major mowing session — the gearbox has a fill plug that doubles as a level check point, and the oil surface should reach the lower edge of the fill hole when the unit is on a flat surface. Second, inspect oil color and clarity; milky or foamy oil indicates water ingress through a failed seal, and that gearbox should be serviced immediately before continued use causes bearing corrosion. Third, the first oil change after 50–70 hours is critical because it removes metallic particles generated during initial gear bedding-in. Fourth, oil must be completely drained at each change — do not top up old oil, as additive depletion accumulates. Fifth, ensure the vent plug (breather) remains clear of caked mud or debris; a blocked breather creates internal pressure that accelerates seal failure and leads to oil leaks around the shaft exits.
8. Flail Mower Gearbox vs. Rotary Mower Gearbox: Key Differences
One of the most common questions from first-time buyers concerns the differences between a flail mower gearbox and a standard rotary cutter gearbox. While both transmit PTO power to cutting blades, their mechanical design, operating characteristics, and ideal use cases differ substantially. Understanding these differences helps equipment purchasers make the right selection for their specific field conditions and grass type.
| Comparison Point | Flail Mower Gearbox | Rotary Mower Gearbox |
|---|---|---|
| Blade Attachment | Free-swinging blades on rotating drum shaft | Fixed blades on a horizontal rotating disc |
| Typical Gear Ratio | Higher speed-increasing ratio (e.g., 1:3) | Lower ratio; disc runs closer to PTO speed |
| Best Vegetation Type | Thick brush, shrubs, rough terrain, crop residue | Light to medium grass, maintained turf |
| Stone / Rock Tolerance | High — blades fold back on impact | Low — fixed blades can be damaged or become projectiles |
| Housing Weight | Heavier (GGG40 cast iron, ~18 kg) | Lighter alloy construction typical |
9. Regulatory Compliance and Industry Standards
Operators and importers of agricultural gearboxes and flail mowing equipment must navigate a layered framework of safety, environmental, and trade regulations that vary by country and region. Below is an overview of the key standards applicable to the EP-T310A and the equipment it powers.
Brazil — ABNT, NR-12, MAPA, and INMETRO
In Brazil, machinery safety is regulated primarily through NR-12 (Norma Regulamentadora No. 12), issued by the Ministry of Labour and Employment (Ministério do Trabalho e Emprego). NR-12 mandates that PTO-driven agricultural machinery — including flail mowers — must have clearly designated safety zones, PTO shaft guards, and emergency stop mechanisms. Imported agricultural equipment for professional use may be subject to INMETRO (Instituto Nacional de Metrologia, Qualidade e Tecnologia) conformity assessment. The Brazilian Forest Code (Lei No. 12.651/2012) and MAPA’s crop protection guidelines also influence vegetation management practices, effectively defining the operating context for flail mowers in sensitive land areas near waterways and conservation zones.
European Union — Machinery Directive 2006/42/EC and ISO 5674
Within the European Union, agricultural machinery gearboxes connected to tractor PTO systems fall under the scope of the EU Machinery Directive (2006/42/EC), which requires CE marking and a Declaration of Conformity before market placement. ISO 5674:2004 specifically addresses guards for agricultural PTO-driven machines, setting minimum requirements for shaft guard geometry and attachment strength. These standards are internationally referenced and are often used as baseline specifications by agricultural equipment buyers globally, including procurement teams in South American markets.
United States — ASABE Standards and OSHA
In the United States, the American Society of Agricultural and Biological Engineers (ASABE) publishes Standard S201, covering tractor PTO safety, and Standard EP456, which addresses skid steer and compact utility tractor implement compatibility — relevant for buyers evaluating skid steer flail mower gearbox options. OSHA 1928.57 regulates PTO guarding on agricultural tractors, requiring integral shielding on any exposed driveshaft. U.S. importers of agricultural gearboxes should ensure compliance with ASABE dimensional standards for PTO shaft profiles.
ISO and Global Standards
ISO 11684 (Safety signs and hazard pictograms for agricultural machinery) and ISO 4254-7 (Agricultural machinery — Safety — Part 7: Combine harvesters, forage harvesters and cotton pickers) provide the broader international framework that the EP-T310A’s design references. ISO 9001:2015 quality management certification at the manufacturing level provides buyers with assurance that dimensional tolerances and material properties are controlled through documented processes rather than ad hoc inspection.
10. About Us
We are a specialist manufacturer of agricultural power transmission components with decades of accumulated experience in rotary cutter gearboxes, flail mower gearboxes, and related drivetrain systems. Our production facilities are equipped with CNC gear grinding machines, coordinate measuring equipment, and dedicated quality control lines that ensure every flail mower gearbox leaving the facility meets or exceeds the dimensional and performance specifications of the original Comer designs it replaces.
We do not sell through intermediaries for most direct inquiry channels, which means buyers receive consistent technical support from people who understand gearbox mechanics at the component level. Certifications on file include ISO 9001:2015 quality management systems and product documentation aligned to CE Machinery Directive requirements for major global markets.
Workshop
11. Related Products — Complete Driveline Solutions
A high-performance flail mower gearbox operates as part of a broader drivetrain system. We manufacture and supply the full chain of power transmission components needed to complete your setup, ensuring system-level compatibility and reducing the risk of mismatched parts.
Agricultural PTO Shafts
The EP-T310A pto flail mower gearbox connection requires a correctly rated and dimensioned PTO shaft to deliver power safely from the tractor. Our range covers 6-spline and 21-spline profiles in multiple torque capacities, with telescoping designs that accommodate the full working geometry range of 3-point hitch-mounted flail mowers. All shafts include full-coverage safety guards complying with ISO 5674 requirements.
Drive Chains and Sprockets
For mower configurations that use secondary chain drives from the gearbox output to the rotor shaft, we supply matched roller chains and sprockets engineered to the same load ratings as the gearbox itself. Mismatched chain drives are a frequent source of premature drivetrain failure in agricultural mowing equipment. Our one-stop supply model covers the complete driveline — from tractor PTO to flail rotor — allowing our customers to source a fully compatible system from a single technical point of contact rather than managing multiple suppliers for each component.
Frequently Asked Questions
Q1. What are the signs that a flail mower gearbox needs replacement rather than repair on a working farm in Brazil?
Key indicators that a flail mower gearbox maintenance assessment should lean toward replacement rather than rebuild include: persistent oil leaks after seal replacement (indicating housing distortion or cracked casting), rumbling or knocking noise from within the housing (bearing failure), significant play in the output shaft (worn bearing races or shaft journals), or a visible housing crack. When the cost of parts plus workshop time for a full overhaul approaches or exceeds 60–70% of the cost of a new EP-T310A unit, replacement offers better value and restores full working capacity immediately.
Q2. How much horsepower does it take to run a flail mower using this gearbox effectively in Brazilian pasture conditions?
The EP-T310A is rated to a maximum input power of 22.1 kW, which equals approximately 30 HP at the PTO. In practice, a tractor of 35–50 HP is recommended for most Brazilian pasture and roadside applications, which provides the necessary power reserve to maintain blade speed when encountering dense vegetation without overloading the gearbox. For lighter-duty orchard or turf work, a 25–35 HP tractor may be sufficient depending on working width and vegetation density.
Q3. Is it possible to get a reliable flail mower gearbox replacement for Comer T-310A without any frame modification?
Yes. The EP-T310A is dimensionally matched to Comer T-310A specifications, including input shaft profile (1 3/8″ Z6 spline), output shaft diameter (33 h7), and mounting bolt pattern. No machining or adapter plates are needed for a direct swap. We recommend confirming your existing mower’s mounting bolt pitch and output shaft keyway configuration before ordering to eliminate any edge-case fitment surprises.
Q4. What are the main disadvantages of a flail mower compared to a rotary cutter when choosing equipment for Brazilian fazenda operations?
Flail mowers typically have higher upfront cost and require more horsepower per meter of working width compared to rotary cutters. Their blade systems are mechanically more complex, meaning more wear items (individual flails, pivot pins, rotor bearings) to inspect and replace. For large-scale flat pasture with light, uniform grass — common in some Mato Grosso operations — a rotary cutter may offer lower operating cost. Where stones, roots, or mixed vegetation are present, however, the flail mower’s free-swinging blade design makes it safer and more effective, as blades fold back rather than projecting debris as projectiles.
Q5. Which PTO shaft specification is compatible with the EP-T310A flail mower gearbox input shaft, and how do I match it correctly?
The EP-T310A input shaft is a 1 3/8″ diameter, 6-spline (Z6) profile — the most widely used standard in the 30–60 HP tractor segment globally. The PTO shaft connecting the tractor to the gearbox must have a matching 1 3/8″ Z6 female yoke at the implement end. When sizing a replacement PTO shaft, also verify the collapsed and extended length matches the distance between the tractor PTO flange and the gearbox input flange at the mower’s operating 3-point hitch height. The shaft should operate within 15–25 degrees of its telescoping range to ensure uniform velocity joint angles and minimize vibration.
Editor: PXY
