Shandong Shengyue Technology Development Co.,Ltd is one of the most professional tri-ring · sitom heavy-duty truck chassis powertrain systems, front and rear axle housings, and powertrain components. manufacturers and suppliers in China. Please feel free to buy high quality genuine auto parts at competitive price from our factory.
34NC1C-02011-H: Rear Axle Shaft
Located inside the rear axle housing, it transmits the immense torque from the final drive/differential directly to the rear wheel hubs on both sides, driving the vehicle forward.
34T3-01120-340/79: Main Reducer & Differential Assembly
It redirects the longitudinal rotational power transmitted by the driveshaft by 90 degrees, converting it into transverse driving force, and utilizes an internal differential to allow the wheels on either side to rotate at different speeds during turns.
33NC1C-04012: Front Steering Knuckle Component / Front Axle Drivetrain Small Parts
Installed at the connection point between the front steering knuckle and the kingpin, this component supports the vertical load of the vehicle's front end and ensures that the steering knuckle rotates smoothly around the kingpin during steering maneuvers, thereby reducing mechanical wear.
34T36-01252: Axle Housing Sub-component / Bearing Spacer
This is a precision adjustment component located within the rear axle assembly. During the installation of the final drive bearings or the adjustment of the gear mesh clearance (backlash), the spacer ensures precise axial positioning and preload, preventing axial movement of the gears during high-speed operation and under heavy loads.
Maintenance Recommendations for Chassis and Rear Axle Components
1. Verify Rear Axle Gear Ratio: When replacing a reduction gear assembly (e.g., 34T3-01120-340/79), ensure the gear ratio (tooth count ratio) exactly matches that of the original unit. For dual-drive vehicles (tandem rear axles), the gear ratios of the intermediate and rear axles must be identical; otherwise, severe drivetrain binding will occur between the axles, rapidly destroying the inter-axle differential.
2. Verify Axle Shaft Splines: When replacing an axle shaft (e.g., 34NC1C-02011-H), in addition to checking the length, carefully count the number of splines at both ends.
3. Simultaneous Replacement of Heavy-Duty Oil Seals and Gaskets: When removing an axle shaft or main reduction gear for maintenance, the axle shaft oil seal (at the axle housing) and the main reduction gear gasket are highly susceptible to damage. These must be replaced during the procedure, and the system refilled with heavy-duty vehicle gear oil (85W-90 GL-5) meeting specifications to prevent premature gear wear and oil leakage.
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