PTO Gearbox

PTO Gearbox for Reliable Power Transmission

An PTO Gearbox is a key transmission component used to transfer power from a tractor’s PTO shaft to agricultural implements. These gearboxes convert rotational speed and torque to match the operating requirements of equipment such as rotary cutters, rotary tillers, grain augers, fertilizer spreaders, and irrigation pumps.

GTM manufactures PTO Gearboxes for a wide range of PTO-driven farm equipment. The gearboxes are designed for stable torque transmission, predictable gear ratios, and consistent operation under continuous field workloads.

Our product range includes:

These gearboxes are used in both OEM machinery production and replacement applications for existing farm equipment.

Product Overview

The GTM PTO Gearbox series is designed for tractors operating with 540 RPM or 1000 RPM PTO outputs. Gear ratios are configured to match different agricultural implements requiring either higher blade speed or higher torque.

Typical technical range:

Parameter	Specification
Power Range	15 HP – 120 HP
Input Speed	540 RPM / 1000 RPM PTO
Gear Ratio Options	1:1.46 / 1:1.93 / 1:2.92 / Custom
Maximum Output Torque	Up to 900 N·m
Mounting Types	Flange / Foot / Shaft Mounted
Output Shaft Diameter	25 mm – 45 mm
Housing Material	Cast Iron / Aluminum Alloy
Gear Material	Heat-treated 20CrMnTi Alloy Steel
Lubrication	Oil Bath Lubrication
Noise Level	≤ 80 dB

Each PTO Gearbox is built with precision-machined gears and heat-treated shafts to support stable transmission performance during long operating hours in the field.

Key Design Characteristics of PTO Gearboxes

Stable Torque Transmission

The PTO Gearbox uses hardened alloy steel gears that provide consistent torque output for PTO-driven farm implements operating under variable field loads.

Long Service Life

Heat-treated gear components and heavy-duty bearings help reduce gear wear during continuous operation in soil preparation, mowing, or grain transport applications.

Standard PTO Compatibility

Most models support standard tractor PTO shafts (1-3/8" Z6 or Z21 spline), allowing integration with commonly used agricultural machinery.

Simplified Maintenance

Oil bath lubrication and accessible inspection points allow routine maintenance such as oil replacement and condition inspection.

Adaptable Gear Ratio Options

Different PTO Gearbox gear ratios are available to match the torque and speed requirements of different farm equipment.

PTO Gearbox Types and Typical Applications

Different implements require specific gearbox structures and torque characteristics.

Gearbox Type	Typical Agricultural Equipment	Power Range	Output Shaft	Ratio Options
Rotary Cutter Gearbox	Rotary mower, bush hog, pasture slasher	30–100 HP	1-3/8"	1:1.47 / 1:1.93
Rotary Tiller Gearbox	Rotary cultivator, soil tiller	20–80 HP	1-3/8"	1:2.07 / 1:3.0
Grain Transportation Gearbox	Grain auger, grain conveyor	15–60 HP	35 mm	1:1 / 1:2
Custom PTO Gearbox	Fertilizer spreader, sprayer, feed mixer	15–120 HP	Custom	Custom

These PTO Gearboxes are commonly used in equipment such as:

PTO-driven rotary mowers for pasture maintenance
rotary tillers used in soil preparation and cultivation
grain augers and grain conveyors during harvest operations
fertilizer spreaders and seed distribution equipment
PTO irrigation pumps for water management

Materials and Manufacturing Features

The durability of an PTO Gearbox depends largely on its internal materials and machining accuracy.

Gear Materials

Gears are manufactured from 20CrMnTi alloy steel and undergo carburizing and heat treatment to improve load capacity and fatigue resistance.

Bearings

Heavy-duty tapered roller bearings support stable shaft rotation under continuous torque loads.

Sealing System

Double-lip oil seals reduce lubricant leakage and help prevent dust contamination in field environments.

Housing Structure

Cast iron housings provide rigidity and vibration resistance when operating PTO-driven agricultural machinery.

Surface Treatment

Protective coatings and powder paint improve corrosion resistance for equipment operating in outdoor agricultural conditions.

Typical Working Environments

PTO gearboxes are commonly installed in machinery operating in environments such as:

pasture mowing and vegetation control
soil cultivation and seedbed preparation
grain harvesting and crop transport systems
fertilizer and feed distribution equipment
irrigation and water pumping systems

These working environments often involve dust, soil particles, vibration, and long operating hours, making gearbox durability and sealing performance important factors.