SINOTRUK HOWO Cast Lower Thrust Rod Assembly / Torque Rod AZ9725521174

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SINOTRUK HOWO Cast Lower Thrust Rod Assembly / Torque Rod AZ9725521174 

Key Functions
1. Preventing Axle Displacement: The lower thrust rod connects the truck frame to the drive axle housing. It primarily restricts the longitudinal (fore-aft) movement of the intermediate and rear axles during driving, acceleration, and braking.
2. Transmitting Propulsive and Braking Forces: It rigidly transfers driving forces from the wheels and braking forces to the vehicle body, ensuring the truck maintains a straight path without veering.
3. Cushioning Chassis Impacts: Heavy-duty rubber torsion bushings (suspension bushings) press-fitted at both ends effectively absorb and dampen bumps and torsional vibrations from rough road surfaces, ensuring driving stability under heavy-load conditions.

Installation Location
Each 6×4 or 8×4 heavy-duty truck with dual drive axles typically requires four lower torque rods.
These are installed parallel to one another beneath the vehicle's chassis frame, connecting the frame to the lower brackets on the intermediate and rear axle housings (with one rod each at the front-left, front-right, rear-left, and rear-right positions). Together with the V-shaped torque rods (upper torque rods) located above them, they form a stable "three-dimensional spatial positioning mechanism."

Failure Symptoms and Replacement Recommendations
1. Common Wear: While the thrust rod body itself rarely fails, the rubber bushings at both ends are high-wear components. Under prolonged heavy loads or harsh operating conditions, the rubber is prone to cracking, increased play, or debonding.
2. Symptoms of Failure: When this component fails, a distinct knocking sound may be heard from the rear chassis during acceleration, gear shifting, or braking; the rear of the vehicle may sway during high-speed driving, and uneven rear tire wear may occur.
3. Maintenance Recommendations: If inspection reveals only bushing damage without deformation of the rod body, the matching torque rod bushing (AZ9631521177) can be replaced individually using a press to save on maintenance costs; however, if the rod body shows cracks or bending, the entire rod must be replaced.

DETAILS

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