The ZF Main Shaft 2nd Gear (Part No. 1316 304 002) is a precision-engineered component designed specifically for the ZF TraXon 12TX2621TD automatic transmission system (AMT). As modern logistics demands higher efficiency, this transmission series is widely deployed in high-end Sinotruk Sitrak C7H

This gear is mounted on the main shaft and is critical for transferring torque effectively in the lower gear range. Unlike standard manual gearbox parts, components for the TraXon AMT system require tighter manufacturing tolerances to ensure seamless electronic synchronization and shifting. Our replacement gear meets these rigorous OEM standards, ensuring your fleet maintains optimal fuel efficiency and transmission durability.

Technical Specifications

Part Name: Main Shaft 2nd Gear
OEM Reference: 1316 304 002 (1316304002)
Product Category: Sinotruk Spare Parts / Transmission & Gearbox
Transmission Model: ZF 12TX2621TD (TraXon AMT Series)
Installation Position: Main Shaft Assembly
Material: High-grade Case-Hardened Alloy Steel (20CrMnTi equivalent)
Processing: Precision Hobbing and Grinding for noise reduction
Heat Treatment: Carburized for high surface hardness and core toughness
Application: Sinotruk Sitrak (Equipped with ZF AMT)

Why Choose Our Transmission Parts?
Replacements for AMT transmissions are sensitive. A slight deviation in gear tooth profile can cause sensor errors or transmission fault codes.

Precise Mesh: The helical gear teeth are ground to exact specifications to ensure quiet operation and perfect engagement with the countershaft.
Wear Resistance: Engineered to withstand the high torque loads of 540HP+ engines common in Sinotruk prime movers.
Direct Fit: No modification required; installs exactly as the factory original.