FAST Gearbox Assy synchronizer 12JSDX240T-1701170-1 for sale

Adopting a multi-cone synchronization structure, this synchronizer features 3-4 conical friction surfaces (depending on the specific gear position) that significantly increase the friction area during gear shifting. Compared with traditional single-cone synchronizers, it shortens the synchronization time by approximately 20%-30%, effectively reducing gear shifting force and avoiding "gear grinding" phenomena. Additionally, the synchronizer hub and slider are designed with an optimized tooth profile and guide groove— the hub uses a spline connection with high fit precision (H7/g6 tolerance grade) to ensure stable power transmission, while the slider’s arc-shaped guide structure prevents jamming during rapid gear shifts

Targeting heavy-duty operating conditions, the synchronizer has a maximum torque-bearing capacity of 2400 N·m, which is fully compatible with the 12JSDX240T gearbox’s output torque range and meets the power demands of vehicles under high-load conditions (e.g., long-distance transportation of goods, uphill driving with heavy loads). Its operating temperature range is -40℃ to 150℃, ensuring stable performance in extreme cold or high-temperature environments. Moreover, the synchronization efficiency remains above 95% even after 100,000+ gear shifting cycles, reflecting excellent durability

Key components of the synchronizer are made of high-quality materials: the synchronizer ring uses alloy cast iron (HT300) with high wear resistance and heat dissipation, which can withstand high temperatures generated by friction during gear shifting; the synchronizer hub and slider are made of 40Cr alloy steel quenching and tempering treatment, with a hardness of HRC 28-32, ensuring sufficient strength and toughness. The manufacturing process adopts CNC precision machining, with dimensional accuracy controlled within ±0.02 mm, and the surface of friction components is treated with shot peening to improve surface roughness (Ra ≤ 1.6 μm) and reduce friction coefficient fluctuation

This synchronizer is mainly applied in heavy-duty commercial vehicles such as 10-25 ton trucks, tractor-trailers, and engineering vehicles (e.g., loaders, excavators) equipped with FAST 12JSDX240T gearboxes. In terms of installation, it adopts a modular design that is consistent with the original gearbox’s assembly interface—no modifications to the gearbox shell or other components are required, and the installation can be completed using standard tools, reducing maintenance time and labor costs. Additionally, it is equipped with a positioning pin and sealing ring to prevent oil leakage and ensure accurate positioning during assembly, further improving the reliability of the transmission system