Sinotruk 10-Speed Transmission Small Cover Assembly

1. Basic Part Information

• Part Name: 10-Speed Small Cover Assembly (Double Rod)

• Part Number: AZ2203210040

• Appearance Features:

  • Main Body: Black cast iron or cast aluminum housing, irregularly shaped, with an extended control mechanism connecting arm on one side.

  • Internal Structure: The image shows a cross-section or disassembled state, revealing the internal shift fork shaft and fork structure — the core mechanical components enabling gear shifting.

  • Accessory Included: A small brass-colored air fitting or locating pin is included below, typically used for pneumatic shift systems or fixed installation.

2. Applicable Models & Installation Position

• Applicable Models: Mainly suitable for Sinotruk HOWO series heavy-duty trucks, such as T7H, A7, SITRAK, and other models.

• Compatible Transmissions: Specifically designed for Sinotruk 10-speed transmissions, including models such as HW15710, HW19710, HW19710C, etc.

• Installation Position: Located on top or on the upper side of the transmission housing. It is an important component of the transmission assembly, connected to the shift lever mechanism.

3. Main Functions & Role

• Sealing & Protection: As the "small cover" of the transmission, its primary function is to seal the transmission, preventing gear oil leakage and keeping out dust and moisture.

• Shift Operation: It integrates the shift fork shaft and shift fork internally. The driver operates the shift lever in the cab, which moves the linkage or cable to actuate this mechanism, achieving engagement and disengagement of transmission gears — thereby completing gear shifts.

• Pneumatic Integration (Optional): Some versions (e.g., those with a "+001" suffix) may integrate a pneumatic lock valve or double H valve for pneumatic-assisted shifting or neutral coasting control.