Auxiliary Main Shaft Reduction Gear

Product Overview

The auxiliary main shaft reduction gear is a critical gear component located within the auxiliary gearbox section of a heavy-duty truck’s transmission system. It provides an additional reduction stage, allowing for a wider range of gear ratios and optimized torque delivery, especially under heavy-load or off-road conditions.

This gear plays a vital role in low-speed torque multiplication, enhancing vehicle control and drivability in complex working environments such as construction sites, mining operations, and long-haul mountain roads.

Engineered for durability and precision, our auxiliary reduction gears are compatible with popular transmissions like FAST 12JSD, EATON, ZF, and OEM models from SINOTRUK, FAW, SHACMAN, and other Chinese commercial vehicles.

Key Features

• Manufactured from high-strength alloy steel, carburized and precision-ground

• Designed to mesh seamlessly with the auxiliary main shaft and reduction assembly

• Excellent heat resistance and fatigue strength under high-load operation

• Available in various tooth counts and module sizes to match OEM ratios

• Supports OEM part numbers and custom gear drawings for tailored fit

• Compatible with split-case and integrated gearbox types

Technical Specifications