Why Choose Us?
Reliable Quality: Our products meet the highest industry standards.
Quick Delivery: Efficient shipping to ensure minimal downtime.
Expert Support: Professional assistance for installation and troubleshooting.
When your Sinotruk SITRAK C7H struggles to stay in first gear or pops out of reverse under load, don’t blame the driver — check the synchronizer sliding sleeve. The 1312302057 is a critical component in the ZF-sourced (often branded as ZF) 16-speed transmission, responsible for engaging low gears cleanly and holding them under heavy torque.
Standard: OE (Original Equipment) Quality, Compliant with Sinotruk Factory Specifications
Warranty: 12-Month Manufacturer Warranty
1. WE TREAT EVERY CUSTOMER AS OUR FRIEND, STICK TO THE PRINCIPLE: WIN-WIN AND MUTUAL BENEFIT ;
2. A VARIETY OF CHOICE FOR PRODUCTS: QUALITY, BRAND, PACKAGING;
3. WE WILL REPLY YOU FOR YOUR INQUIRY IN 24 HOURS.
4.Professional Perfomance SINOTRUCK parts supplier
5. WE WILL BE ON SERVICE 24/24 HOURS ON THE WORKING DAY.
6. ASS: WE WILL OFFER YOU THE BEST AFTER SALES SERVICE.
How to Install the 1312302057 Z&F Synchronizer Sliding Sleeve – Pro Tips
Before beginning, make sure the transmission is securely mounted on a stand and fully drained. This sleeve operates inside the main shaft assembly of the 16-speed manual/AMT gearbox found in Sinotruk SITRAK C7H trucks (2016–present), so full disassembly is required.
Start by removing the shift fork and inspecting its groove for wear. A worn fork will cause misalignment and uneven movement — one of the top reasons new sleeves fail early.
The 1312302057 sleeve fits gears 1–2 and reverse cluster, where impact loads are highest during起步 (start-up) and backing maneuvers. Align the internal splines carefully with the hub; forcing it can damage adjacent synchronizer rings.
Use a light coat of molybdenum-disulfide grease on the splines — never dry install. Check axial travel after mounting: it should slide smoothly without binding or lateral play. If resistance occurs, recheck alignment and clean any burrs from the shaft.
Reassemble using OEM torque specs (typically 90 Nm for retaining nuts), then refill with SAE 75W-90 GL-5 or synthetic equivalent. Perform a low-speed gear cycling test before road use.
