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FAW J5J6 Truck Eaton 12-speed Transmission Part 1702210B73B Top Cover Double H Assembly Top Cover Assembly / Transmission Cover Assembly / Double H Assembly

The 1702210B73B Top Cover Assembly, also known as the Transmission Top Cover, Shift Upper Housing, or Double H Control Assembly, is a core operational component of the manual transmission system in FAW Jiefang (First Automobile Works) heavy-duty commercial vehicles. This assembly serves as the mechanical and pneumatic interface between the driver’s gear shift lever and the internal gearbox components, enabling precise control over gear engagement—especially in high-torque, multi-speed configurations.

Engineered for use with FAW CA-series 12-speed manual transmissions, this top cover integrates a pneumatically assisted Double H shifting mechanism that allows drivers to smoothly switch between high and low ranges without requiring excessive physical effort. It plays a critical role in ensuring accurate gear selection, preventing mis-shifts, and enhancing overall driving comfort during long-haul operations.
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  • 1702210B73B

  • FAW

Attribute Description
Product Name Transmission Top Cover Assembly / Double H Shift Mechanism
Common Names Gearbox Top Cover, Shift Housing, Double H Assembly
Function Transmits driver input to internal gears; controls main box and sub-box range shifting
Position Mounted on top of the transmission housing
Design Type Integrated mechanical-pneumatic control unit with dual-range (High/Low) selection
Application Type Heavy-Duty Trucks, Tractors, Long-Haul Freighters, Construction Vehicles
顶盖双H总成-3


顶盖双H总成-2


Parameter Specification
OEM Part Number 1702210B73B
Alternative Formats
• 1702210-B73B (hyphenated variant)
• 1702210-A73B (earlier version; verify compatibility)
Material High-strength alloy cast steel or lightweight aluminum (depending on supplier/model)
Weight 18 kg – 22 kg
Structure Features
• Integrated shift forks and shafts
• Built-in self-lock and interlock mechanisms
• Pneumatic Double H valve for auxiliary box range switching
Shift Precision Positioning accuracy within ±0.5 mm to prevent missed shifts
Operating Principle Air-assisted mechanical actuation via compressed air from vehicle's brake system
Performance Standards Meets FAW Jiefang OEM specifications; designed for durability up to 1.2 million km
Key Technologies Double H pattern, pneumatic range selection, wear-resistant hardened fork tips


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