Description
Agricultural Machinery Solutions
EP-TB-27C Rotary Tiller Gearbox
Replacement of Comer Code TB-27C | High-Performance PTO Tiller Gearbox
SKU: EPT-TB27C-2 | Category: Rotary Tiller Gearbox / Agricultural Gearbox
1. Technical Specifications
| Parameter | Value / Specification |
|---|---|
| Product Reference | EP-TB-27C (Replacement of Comer TB-27C) |
| SKU | EPT-TB27C-2 |
| Maximum Input Power | 40.5 kW |
| Maximum Output Torque | 693 Nm |
| Gear Ratio | 1:1 |
| Gear Arrangement Code | 26 |
| Input Shaft Type | Z-shaft, 1 3/8″ (6-spline) — Type C |
| Output Shaft Type | 1 3/8″ (6-spline) — Type A |
| Housing Material | Cast Iron GG25 |
| Gross Weight | 39.5 kg |
| Oil Type (SAE Viscosity Grade) | 80W-90 Gear Oil |
| Maximum Oil Capacity | 1.1 L |
| Oil Change Interval | 500 operating hours (first change at 50 h) |
| Ships With Oil | No (dry unit) |
| Recommended PTO Input Speed | 540 RPM (standard agricultural PTO) |
| Applicable Tractor Power Range | Up to ~55 HP (≈40.5 kW) |
| Mounting Compatibility | Standard rotary tiller flange mount (Comer TB-27C pattern) |
| Seal Type | Rubber/elastomer oil seals (all shaft exits) |
| Bearing Type | Deep groove ball bearings + tapered roller bearings |
| Surface Treatment | Electrophoretic primer coat + outdoor-grade topcoat |
2. Five Key Product Advantages
1. High Torque Capacity
With a maximum output torque of 693 Nm and power handling up to 40.5 kW, the EP-TB-27C Rotary Tiller Gearbox is engineered for heavy-duty rotary tillage. It maintains torque consistency even under fluctuating PTO shaft speeds — critical for tilling compacted or clay-rich soils common in tropical agricultural regions.
2. Cast Iron GG25 Durability
The housing is precision-cast from GG25 grey cast iron — a material chosen for its excellent vibration damping, dimensional stability, and resistance to wear under continuous mechanical stress. This ensures the gearbox shell maintains its structural integrity across thousands of operating hours in demanding outdoor environments.
3. Direct Comer Code Compatibility
This unit is designed as a drop-in replacement for Comer Code TB-27C gearboxes. The shaft dimensions, mounting flange geometry, and gear arrangement (configuration 26) match OEM specifications, so equipment already deployed in the field can be upgraded or restored without structural rework or custom fabrication.
4. Low-Noise Operation
Precision gear meshing, high-tolerance bearing selection, and optimized oil circulation combine to produce a rotary tiller top gearbox that operates at notably reduced noise levels. This matters not just for operator comfort over extended working shifts, but also for compliance with occupational noise exposure limits increasingly enforced in agricultural environments across South America and Europe.
5. Extended Maintenance Interval
With a maximum oil change interval of 500 hours and an oil capacity of just 1.1 liters of SAE 80W-90 gear oil, routine maintenance is straightforward and infrequent. The seal system is designed to prevent oil ingress of soil particles while retaining lubrication within the housing, even under lateral loading from uneven ground surfaces.
3. How the Rotary Tiller Gearbox Works
Understanding rotary tiller gearbox how does it work is essential for correct installation, troubleshooting, and maintenance planning. The operating principle is centered on power transfer through a structured gear train from the tractor’s power take-off (PTO) shaft to the rotary tiller’s working shaft.
When the tractor’s PTO engages, rotational energy is transmitted through the PTO shaft into the gearbox’s input shaft (Z-shaft, 1 3/8″ / 6-spline). Inside the cast iron housing, this rotation passes through a gear arrangement (code 26) configured at a 1:1 ratio — meaning the output shaft rotates at the same speed as the input but with the torque amplified and direction stabilized for consistent tiller operation. The gear teeth are ground to tight tolerances, ensuring minimal backlash and efficient power transmission across the full torque range up to 693 Nm.
Needle roller bearings and tapered roller bearings are positioned at each shaft exit point to absorb both radial and axial loads generated during tillage — particularly the lateral forces that result from tines striking stones or compacted soil layers. The rubber lip seals at all shaft exits prevent the ingress of soil and moisture into the oil-filled housing while retaining the SAE 80W-90 lubricant within the operating cavity.
The output shaft (X-shaft, 1 3/8″ / 6-spline) then delivers this power to the tiller’s rotor shaft, driving the tine blades through the soil. Because the gear ratio is 1:1, rotational speed at the output matches input speed — the gearbox functions primarily as a directional and load-distribution device rather than a speed multiplier, which contributes to its durability under continuous heavy-load operation.
4. Rotary Tiller Gearbox Parts & Materials
The EP-TB-27C Rotary Tiller Gearbox comprises several interrelated mechanical sub-assemblies. Each rotary tiller gearbox parts group is sourced and machined to specific tolerances to ensure consistent performance over extended service life.
5. Application Scenarios
The EP-TB-27C gearbox rotary cultivator is designed for a broad range of demanding agricultural and land-preparation applications. Below are the primary deployment scenarios where this unit delivers measurable value.
Rotary Tillage for Row Crops
Deployed on mid-sized tractors (30–55 HP) ahead of soybean, corn, and sugarcane planting seasons. The 1:1 gear ratio maintains consistent tine speed under variable soil resistance, producing uniform seedbed preparation — a critical factor for precision planting systems commonly used in large-scale farms across the Cerrado region of Brazil.
Manure Spreader Drive Systems
The same TB-27C gearbox architecture is compatible with manure spreader drive trains. The housing dimensions and shaft configuration allow it to serve as the primary power distribution point in high-torque spreading equipment, where continuous load cycling over extended periods tests gearbox durability rigorously.
Smallholder & Cooperative Farm Operations
At up to 40.5 kW input, this tiller gearbox suits the power range of compact utility tractors — the type most commonly found in smallholder and cooperative farming contexts in South America, Southeast Asia, and Sub-Saharan Africa. Its straightforward maintenance schedule makes it practical for operations where technical service capacity is limited.
Landscape & Turf Preparation
Beyond pure agricultural use, this rototiller gearbox handles landscaping and sports field preparation where controlled, shallow-pass tillage produces a consistent soil finish. Its low-noise characteristic is a practical benefit in peri-urban and residential landscaping projects where noise ordinances may be in effect.
Equipment Rebuilding & Fleet Standardization
Agricultural equipment managers maintaining diverse fleets of rotary tillers benefit from the TB-27C’s direct OEM compatibility. Using a standardized replacement gearbox across multiple machine brands reduces spare-parts inventory complexity and simplifies technician training — a tangible operational efficiency gain for large agribusinesses managing dozens of tillage units.
6. Installation Guide
Correct installation of the rotary tiller gearbox for tractor replacement is critical to achieving the unit’s rated service life and avoiding early failure from misalignment or improper lubrication. Follow this sequence:
- Prepare the rotary tiller. Confirm the tiller is properly assembled with tines in place and all structural fasteners torqued to specification. Disengage the PTO and shut off the tractor before beginning gearbox work.
- Position and align the gearbox. Set the EP-TB-27C on the tiller’s mounting point so that the input (Z) shaft axis aligns with the PTO shaft axis within ±0.5°. Angular misalignment above this threshold accelerates bearing wear and seal failure.
- Secure the mounting flange. Attach using Grade 8.8 (or higher) metric fasteners at the specified torque values for the flange bolt diameter. Use threadlock compound on all flange bolts to prevent loosening from vibration.
- Connect the PTO shaft. Slide the PTO shaft’s splined collar onto the gearbox input shaft (Z, 1 3/8″ / 6-spline) and engage the retaining locking collar. Verify shaft telescoping range is within limits at both minimum and maximum working lengths.
- Connect the output shaft. Attach the output (X) shaft to the tiller rotor drive — either via direct spline engagement or through a chain/belt coupling depending on the tiller design.
- Fill with oil. Fill the gearbox to the correct level with SAE 80W-90 gear oil (maximum 1.1 L). Do not overfill; excess oil causes seal stress and leakage.
- Conduct a test run. Engage PTO at low speed and observe the gearbox for leaks, unusual vibration, or noise. After the first 50 operating hours, perform an oil change to flush any metal particles from the break-in period.
7. Regulatory Compliance & Standards
Agricultural gearboxes and PTO-driven equipment are subject to safety and environmental regulations in multiple jurisdictions. Buyers in Brazil and internationally should be aware of the following relevant frameworks:
Brazil (ABNT NBR Standards & NR-31): In Brazil, agricultural machinery safety is governed in part by NR-31 (Norma Regulamentadora 31), which addresses worker health and safety in rural activities. PTO shafts and rotating implement connections must be guarded in accordance with ABNT NBR ISO 11684 (safety signs) and related implement safety standards. Operators are required to use approved PTO shaft guards at all times during operation.
European Union (Machinery Directive 2006/42/EC & EN ISO 11684): Equipment sold within the EU must comply with the Machinery Directive, which governs mechanical power transmission guarding, risk assessment documentation, and CE marking. Rotary tiller gearboxes used with EU-registered tractors are expected to meet EN 1553 (agricultural machinery — trailed, semi-mounted, and mounted implements) requirements for PTO-driven implement safety.
United States (ASABE Standards): The American Society of Agricultural and Biological Engineers (ASABE) publishes standards ASABE S318, S201, and S328, which govern PTO shaft dimensions, implement connection geometry, and rotary tillage equipment design. The 1 3/8″ / 6-spline shaft configuration used in the EP-TB-27C Rotary Tiller Gearbox conforms to ASABE S201 Series 1 specifications.
ISO 11684 (Global): This international standard applies globally and sets requirements for safety signs and pictograms on agricultural and forestry equipment. Equipment suppliers providing rotary tiller gearbox for tractor parts for export must ensure product labeling meets this standard’s visibility and durability requirements.
Environmental — Lubricant Disposal: Used gear oil from the TB-27C must be disposed of in accordance with local environmental regulations. In Brazil, CONAMA Resolution 362/2005 governs the collection and re-refining of used lubricating oil. In the EU, the Waste Framework Directive (2008/98/EC) requires proper hazardous waste handling. Operators should coordinate with licensed collectors for oil disposal compliance.
8. About Us
We are a dedicated manufacturer of high-performance agricultural gearboxes and power transmission components, supplying farms, equipment dealers, and agri-machinery rebuilders across more than 40 countries. Our engineering team specializes in rotary tiller gearbox manufacturers capabilities — from standard catalogue products to fully customized gear solutions configured for specific tractor PTO parameters and implement mounting requirements.
Our production facilities are equipped with CNC gear hobbing, precision grinding lines, and CMM quality inspection systems. Every gearbox leaving the factory is pressure-tested for oil-tightness, shaft-run-out checked on V-blocks, and function-tested under load before shipment. This in-house quality control process means buyers receive units that are verified, not simply assembled and shipped.
We hold ISO 9001:2015 quality management system certification and maintain CE-compliant product documentation for customers importing into European markets. Our product range covers rotary tiller gearboxes, flail mower gearboxes, manure spreader gearboxes, round baler gearboxes, post hole digger gearboxes, and the full range of PTO-driven implement transmissions — making us a genuine one-stop source for agricultural gearbox procurement.
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9. Related Products & System Compatibility
The EP-TB-27C is one component in a complete power transmission system. To ensure full system compatibility and simplify procurement, we also supply the complementary drive components listed below. All products are designed and tested for compatibility with our rotary tiller gearbox for tractor parts range — giving buyers a single-source solution rather than managing multiple suppliers for a connected drivetrain.
PTO Shafts for Rotary Tiller Gearboxes
A matched PTO shaft ensures the power connection between your tractor and the EP-TB-27C operates within correct telescoping ranges, spline engagement depths, and torque ratings. Mismatched PTO shaft length or spline count is one of the most common sources of early gearbox failure. Our PTO shaft range covers Series 1 through Series 8 configurations, with safety guard tubes and shear bolt or friction overload clutch options. Visit pto-shaft.xyz to explore compatible shaft models for this gearbox application.
Drive Chains & Sprockets
Where the output of the EP-TB-27C connects to a chain-driven rotor system, a properly rated drive chain and matched sprocket set is essential for maintaining the torque rating downstream of the gearbox. We supply agricultural roller chains in standard pitches and hardened sprockets profiled for direct fit with common tiller rotor shafts. Using an under-rated chain downstream of a high-torque gearbox is a common cause of drivetrain failure — pairing components from the same supplier eliminates this specification mismatch risk entirely.
Frequently Asked Questions
Editor: PXY
