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Howo Sinotruck Shacman Foton Faw Truck Parts New Condition Steel Synchronizer Assembly Heavy Duty Vehicle Accessories wg2203100005 Low gear cone hub assembly / Synchronizer low gear cone hub

The WG2203100005 Low-Grade Cone Hub Assembly is a critical component of the synchronizer system within the rear auxiliary gearbox (sub-transmission) of SINOTRUK (China National Heavy Duty Truck Group) HW-series manual transmissions. Officially known as the Sub-Box Synchronizer Low Gear Cone Hub, this precision-machined part enables smooth and shock-free gear engagement during high/low range shifting — particularly when switching between crawler gears and overdrive ranges.

As one of the core friction elements in the synchronization process, it works in conjunction with the synchronizer ring (blocking ring) and sliding sleeve to equalize rotational speeds between gears before meshing. Its advanced surface treatment and robust design ensure reliable performance under extreme torque loads and frequent gear changes common in mountainous terrain, construction transport, and long-haul logistics.
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  • wg2203100005

  • Shacman Sinotruk HOWO FAW Foton Auman

Attribute Description
Product Name Low-Grade Cone Hub Assembly / Sub-Box Synchronizer Low Gear Hub
Common Names Synchronizer Cone Hub, Low Range Cone, Sync Hub (Low Side)
Function Enables speed synchronization during low-range gear engagement
Position Installed inside the rear auxiliary box (sub-box) of multi-speed manual transmissions
Design Type Precision-forged cylindrical hub with external teeth and internal friction cone
Application Type Heavy-Duty Commercial Trucks, Tractors, Dumpers, Long-Haul Freighters
同步器总成-1


同步器总成-2


Parameter Specification
OEM Part Number WG2203100005
Alternative Numbers
• WG2203100006 (High-Grade Cone Hub – companion piece)
• WG2210100007 (Synchronizer Ring)
• WG2210100008 (Sliding Sleeve / Shift Collar)
Outer Diameter (OD) ~220–240 mm (designed for large-center-distance HW series gearboxes)
Height Approx. 35 mm
Tooth Count Typically 48 teeth (verify by batch/model)
Weight 1.85 kg – 2.1 kg
Material High-strength alloy steel (forged and heat-treated)
Surface Treatment
• Friction cone: Molybdenum spraying or carbonitriding for enhanced durability
• Hardness: HRC 58–62 (after treatment)
Operating Environment Immersed in transmission oil; operates under high torque and dynamic load
Design Life >500,000 km under normal driving conditions
Performance Features Fast synchronization, excellent anti-wear properties, stable dimensions under heat


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