ISUZU NJ131 Front Shock Absorber 0503010001 OEM Fit with Twin-Tube Hydraulic Design and Nitrile Rubber Bushings

Shock Absorber Assembly 0503010001 for ISUZU NJ131 CYZ CXZ EXZ — Verified OEM Fit Front Suspension Shock Absorber with Bushings

The Shock Absorber Assembly with OEM number 0503010001 is a verified direct-fit replacement for ISUZU NJ131 / CYZ / CXZ / EXZ medium and heavy-duty trucks. This shock absorber is a critical component of the front suspension system, responsible for controlling spring oscillation, dampening road-induced vibrations, and maintaining tire contact with the road surface for safe vehicle handling and braking.

The shock absorber is a hydraulic damping device that converts the kinetic energy of suspension movement into thermal energy, which is then dissipated into the surrounding air. It is mounted between the vehicle's chassis frame and the front axle, working in parallel with the leaf spring suspension.

The 0503010001 shock absorber features a twin-tube hydraulic design with a piston valve that controls oil flow between the inner and outer tubes during compression and rebound strokes. The chrome-plated piston rod ensures smooth operation and long seal life, while the nitrile rubber bushings at both mounting eyes isolate vibration and reduce noise transfer to the chassis.

This shock absorber is manufactured by YIMI (Guangzhou) Automotive Parts Co., Ltd, a leading Chinese supplier of ISUZU truck parts, and is branded under the Zhengzhong (正众) name.

Replace the shock absorber when any of these symptoms appear:

• Excessive bouncing or oscillation after hitting bumps — a worn shock absorber cannot control spring rebound, causing the vehicle to bounce excessively
• Nose dive during braking or body roll during cornering — weakened damping allows excessive weight transfer, reducing stability
• Uneven or accelerated tire wear — loss of tire contact with the road causes cupping or flat-spotting
• Visible oil leakage from the shock absorber body — a leaking seal allows hydraulic oil to escape, reducing damping effectiveness
• Knocking or clunking noise from the front suspension — worn bushings or a loose shock absorber mount produce noise over bumps
• Steering instability or vague steering feel — worn shock absorbers reduce tire contact pressure, affecting steering precision

1. Preparation: Raise the vehicle on a hoist. Support the front axle independently to relieve tension on the suspension
2. Removal: Remove the shock absorber mounting bolts at the upper and lower mounting points. Remove the old shock absorber. Inspect the mounting points for wear or damage
3. Inspection: Inspect the bushings for cracks or deterioration. Inspect the mounting bracket for corrosion or deformation. Clean all mating surfaces
4. Installation: Position the new shock absorber. Install the mounting bolts and hand-tighten. Torque to specification
5. Final Check: Verify the shock absorber is properly seated and the bushings are correctly positioned. Check for clearance between the shock absorber and surrounding components
6. Road Test: Lower the vehicle and perform a road test to verify proper damping performance and absence of noise

• Every 10,000 km: Inspect shock absorbers for oil leakage and bushing wear. Check mounting bolt torque
• Every 40,000–50,000 km: Inspect shock absorber damping performance. Replace if damping is weak or oil leakage is found
• When excessive bouncing is detected: Replace shock absorbers immediately
• Whenever the suspension is serviced: Inspect shock absorbers and replace if worn

• Standard Packaging: Anti-rust oil + VCI film + neutral carton
• Custom Packaging: Neutral box, color box, or customer-branded packaging
• Suitable For: Suspension repair shops, ISUZU parts distributors, fleet maintenance centers
• Supply Capacity: Stable batch supply with batch-level quality reports available
• MOQ: Unlimited (better price for more quantity)