SINOTRUK HOWO HW25712XSTL 12-Speed Manual Sync Gearbox Transmission Assembly Heavy Truck Parts

SINOTRUK HOWO Truck Transmission System Parts HW25712XSTL 12-Speed Manual Sync Gearbox Transmission Assembly

The SINOTRUK HOWO HW25712XSTL Manual Synchronizer Gearbox Assembly is a heavy-duty transmission component belonging to the truck drivetrain system. It is designed to transfer engine power and torque to the vehicle drive axle through multiple gear ratios, allowing the truck to achieve efficient operation under different load and road conditions. The HW25712XSTL features a 12-speed manual synchronized transmission structure, incorporating a twin counter shaft design and synchronizer mechanism to support high torque transmission requirements. Available technical references indicate that this gearbox has a maximum input torque of around 2500 N·m, a maximum input speed of approximately 2600 RPM, and a total length of about 993 mm. During heavy-duty vehicle operation, the gearbox continuously experiences torque changes, gear shifting cycles, vibration and temperature variation. Proper lubrication, correct clutch operation and regular inspection of internal gears, synchronizers, bearings and seals are important for maintaining transmission performance. If abnormal noise, difficult shifting, gear jumping or oil leakage occurs, inspection should include the complete transmission system, including clutch components, shift mechanism, oil condition and internal gearbox parts. Before purchasing HW25712XSTL, buyers should confirm the transmission model, truck configuration, engine torque range, PTO requirements, housing type and original gearbox identification information to ensure correct compatibility.