Agricultural Gearbox
We supply precision-engineered agricultural gearboxes for OEM manufacturers, machinery distributors, and equipment integrators worldwide — covering PTO drives, right angle drives, rear axle gearboxes, and bevel gear systems designed to handle the real demands of farm machinery.
Products Categories
Agitators Gearbox for Sewage
Agricultural Sprayer Gearbox
Combine Harvester Gearbox
Corn Headers Gearbox
Cutter Bars Gearbox
Feed Mixer Gearbox
Fertilizer Mixer Gearbox
Fertilizer Seeder Gearbox
Fertilizer Spreader Gearbox
Flail Mower Gearbox
Gearbox for Agricultural Machinery
Gearbox for Hay Tedders
Gearbox for P.T.O. Generator & Circular Saws – Belt Saws
Gearbox for Rotary Rakes
Grader Driven Rake Gearbox
Grain Header & Sunflower Headers Gearbox
Grain Storage Gearbox
Grain Transportation Gearbox
Hydraulic Cutters Gearbox
Irrigation Gearbox
Lawn Mower Gearbox
Manure Spreader Gearbox
Micro Tiller Gearbox
Post Hole Digger Gearboxes
Potato Harvester Gearbox
Rotary Cutter Gearbox
Rotary Mower Gearbox
Rotary Tiller Gearbox
Round Baler Gearbox
Silage Machine Gearbox
Snowblower Gearbox
Square Baler Gearbox
What Is an Agricultural Gearbox?
An agricultural gearbox is a mechanical transmission unit that converts the rotational speed and torque delivered by a tractor’s power take-off (PTO) shaft or engine output into the drive conditions required by field implements, harvesting equipment and auxiliary machinery. Rather than a single design, the term covers a broad family of assemblies — bevel gear sets, planetary reducers, worm gear units and multi-speed combinations — each optimised for a specific load profile and mounting geometry.
Selecting the wrong gearbox for agricultural machinery is a common and costly mistake for procurement teams. A unit that is undersized for peak torque loads will fail prematurely in the field. One that is over-specified adds unnecessary weight, purchase cost and servicing complexity. Our engineering team works with OEM integrators and wholesale distributors to match every application to a verified unit with the correct gear ratio, shaft diameter, torque rating and flange interface.
We manufacture and supply the full range: straight bevel and spiral bevel configurations for directional changes, inline reduction units for speed step-downs, and right angle agricultural gearboxes for implement drives requiring 90-degree power redirection — all built to withstand the shock loads, vibration and contamination exposure typical of agricultural field conditions.
Input Speed
540 rpm and 1000 rpm PTO-standard configurations; custom ratios available on request.
Torque Range
Output torques from 195 Nm on compact units up to 50,000 Nm on heavy-duty assemblies.
Shaft Interfaces
1 3/8" and 1 3/4" spline inputs; keyed or splined output shafts from Ø20 to Ø60 mm.
Flange Mounting
Standard flanges from F07 through F60; ISO 5210 and JB/T 2920 electric drive flanges supported.
How an Agricultural Gearbox Transmits Power
Understanding the mechanical logic behind gearbox operation helps engineers select the right unit and anticipate long-term maintenance requirements.
Power Input via PTO Shaft
The tractor's power take-off shaft delivers mechanical energy at a standardized speed — typically 540 RPM or 1000 RPM as specified under ISO 500-3. This rotating input is connected to the gearbox input shaft via a splined coupling, transferring engine torque directly into the gearbox housing.
Torque Multiplication and Speed Reduction
Inside the housing, the input gear meshes with a larger output gear. The ratio between gear teeth counts determines the speed-to-torque relationship at the output shaft. A lower output speed yields proportionally higher available torque — critical for ground-engaging implements that demand pulling force over rotational speed.
Direction Change — Orthogonal or Parallel
If the input and output shafts are at 90 degrees, spiral bevel gears redirect the drive axis — this is the agricultural right angle gearbox configuration. If shafts are parallel, helical or spur gears maintain axis direction while altering speed and torque. The configuration is matched at the specification stage to the geometry of the driven implement.
Power Delivery to the Implement
The output shaft — sized and splined to match the driven implement — delivers conditioned torque directly to tiller blades, mower decks, augers, spreader discs, or rear axle shafts. Oil bath or grease packing lubricates gear surfaces continuously throughout the operating cycle, maintaining efficiency and extending component life.
Power Flow Diagram
Power Source
540 / 1000 RPM
Ratio Change / Direction Change / Torque Output
What is the difference between a right angle agricultural gearbox and a standard inline PTO reducer?
An inline reducer keeps input and output shafts on the same axis and reduces speed while multiplying torque. A right angle agricultural gearbox contains a bevel gear set that redirects the output shaft through 90 degrees relative to the input. Right angle units are used wherever the implement’s driven component — a pump, fan, or rotor — is mounted perpendicular to the tractor PTO shaft. The tradeoff is slightly lower mechanical efficiency (typically 88–93% versus 93–96% for an inline helical reducer at equivalent ratio) and higher sensitivity to correct bearing pre-load, since the bevel mesh creates thrust loads in both axial directions simultaneously.
GEARS QUALITY MATERIALS
16NiCr4, according to standard UNl 5331-AISI 3115 20MnCr5
CASTINGS QUALITY MATERIALS
Aluminium specifications GD-ALSi 12 cu according to standard UNl 5076
Black cast iron G25 according to standard UNl lSO 185
Ductile iron GS 400 according to standard UNl lS0 1083
SHAFTS QUALITY MATERIALS
C 45 according to standard UN EN 1083/1 AISI 1040 20MnCr5
LUBRICATION
The reducer is usually supplied without lubricant, The recommended quantity of
lubricantis indicated on our catalogue and the first replaced must be done after 50-60
hours of running, then replaced after 600-800 working hours
The emptying of the gearbox should be made immediately after the working, with still oil
hot, in order to avoid the deposition of sludge. Clean the oil plugs. Check frequently the oil
level and top up the oil whenever necessary.
Materials and Precautions
Features
Why Choose us?
OEM Supply
Direct supply to agricultural machinery manufacturers with controlled dimensions and consistent production quality across production batches.
Replacement Parts
Interchangeable aftermarket gearboxes for major OEM brands – identical mounting dimensions and performance specifications.
Custom Engineering
Develop improved gear ratios, shaft configurations, and housing variations based on customer drawings or reference samples, and conduct comprehensive Design-to-Manufacture (DFM) reviews.
Technical Support
Standard services include application engineering support such as gearbox selection, load analysis, and installation guidance.
About
About Us
We are a professional manufacturer of agricultural gearboxes with decades of experience in producing agricultural machinery gearboxes and related drive components. Our engineering team focuses on manufacturing products such as Post Hole Digger Gearbox, Lawn Mower Gearbox, Rotary Tiller Gearbox, Rotary Cutter Gearbox, Combine Harvester Gearbox, Potato Harvester Gearbox, Corn Headers Gearbox, Snowblower Gearbox, and Gearbox for Agricultural Machinery.
Our production facility operates fully automatic CNC gear cutting and grinding lines, with in-house gear metrology, heat treatment, and CMM inspection. Every agricultural gearbox leaves our facility after functional run-in testing and dimensional verification against a controlled drawing set.
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