High-strength cast steel Front Axle Knuckle LH 210×250×260mm precision-machined for ISUZU NPR 700P 4HK1
| Dimensions: | 210×250×260mm | Material: | High-strength Cast Steel / Ductile Iron |
| Surface Finish: | Precision-machined + Anti-rust Coating | Weight: | Standard |
| Engine Compatibility: | 4HK1 5.2L, 4HF1, 4HE1 | Factory Number: | 8-97261550-GC |
| High Light: | High-strength cast steel Front Axle Knuckle,Precision-machined Steering Knuckle,210×250×260mm LH Knuckle |
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The Front Axle Knuckle (Left-Hand / LH) with OEM numbers 8972615500 / 8-97261550-0 (Factory No. 8-97261550-GC) is a verified direct-fit replacement for ISUZU NPR / 700P series medium/heavy-duty trucks equipped with 4HK1 5.2L or 4HF1 diesel engines. This knuckle is mounted on the front axle king pin and is a critical structural component connecting the front suspension system and steering system, responsible for supporting the vehicle's front weight and enabling wheel steering.
The steering knuckle is mounted at both ends of the front axle via king pins. The upper portion connects to the steering tie rod, while the lower portion mounts the front wheel hub through wheel bearings. When the driver turns the steering wheel, the steering gear transmits force through the tie rod to the knuckle, which rotates around the king pin, turning the wheels. The knuckle simultaneously bears vertical loads from the front of the vehicle, longitudinal loads during braking, and lateral loads during cornering — making it one of the most complex and highly stressed components in the front axle.
Replace immediately if any of these symptoms occur:
- Loose Steering/Excessive Play — Increased steering wheel free play; delayed steering response (worn king pin bore)
- Front Wheel Wobble/Vibration — Noticeable wheel oscillation while driving, especially on rough roads (worn bearing seat)
- Uneven Tire Wear — Feathering or irregular wear on front tires (misaligned steering geometry)
- Heavy Steering — Steering wheel becomes significantly heavier (knuckle deformation or king pin binding)
- Brake Pull — Vehicle pulls to one side during braking (knuckle deformation causing brake misalignment)
- Unable to Adjust Wheel Alignment — Cannot achieve proper toe/camber angles during alignment (knuckle deformation)
- Clunking Noises — Metallic knocking sounds while driving or turning (knuckle cracks or bearing wear)
| Type | Number |
|---|---|
| Primary OEM | 8972615500 / 8-97261550-0 |
| Factory No. | 8-97261550-GC |
| Associated OE (RH) | 8972615490 / 8-97261549-0 |
| Associated OE (RH) | 8972615491 / 8-97261549-1 |
| Associated OE | 3001030-P301 / 3001030P301 |
| Associated OE | 8972306840 |
| Associated OE | 8972615501 |
| Vehicle Fitment | ISUZU 700P, NPR, NPR-HD, NQR, NRR (1999–2025) |
| Engine Fitment | 4HK1 5.2L / 4HF1 / 4HE1 |
| Brand | Model | Engine | Years |
|---|---|---|---|
| ISUZU | 700P | 4HK1 / 4HF1 | — |
| ISUZU | NPR | 4HK1 / 4HE1 | 1999–2025 |
| ISUZU | NPR-HD | 4HK1 / 4HE1 | 1999–2025 |
| ISUZU | NQR | 4HK1 / 4HE1 | 1999–2025 |
| ISUZU | NRR | 4HK1 / 4HE1 | 1999–2025 |
| Engine Model | Displacement | Description |
|---|---|---|
| 4HK1 | 5.2L | 4-cylinder turbo diesel engine |
| 4HF1 | 4.3L | 4-cylinder diesel engine |
| 4HE1 | 4.8L | 4-cylinder diesel engine |
- This is a FRONT AXLE LEFT (driver side / LH) steering knuckle
- The steering knuckle is a critical structural component of the front axle and steering system — failure can cause loss of steering control, seriously affecting driving safety
- Recommended to replace both left and right sides simultaneously to ensure symmetrical steering geometry and stability
- Recommended to replace king pins and king pin bushings simultaneously when replacing the knuckle
- Wheel alignment is mandatory after installation to ensure correct toe and camber angles
- For 100% accurate fitment, please provide VIN (Chassis Number) or chassis model
| Feature | Benefit + Verification Signal |
|---|---|
| High-Strength Cast Steel / Ductile Iron Construction | Withstands heavy vertical loads, braking loads, and steering lateral forces on heavy-duty trucks — heavy-duty construction ensures durability and reliability under demanding conditions |
| Precision-Machined Mounting Surfaces & Bearing Seats | Ensures precise knuckle-to-hub and knuckle-to-king pin fitment for accurate wheel alignment — machined surfaces and mounting points provide exact fitment and proper wheel alignment |
| 210*250*260mm Standard Dimensions | Exact fit for ISUZU NPR / 700P front axle specifications — direct installation, no modification needed |
| 100% Magnetic Particle Inspection (MT) | Every piece undergoes non-destructive testing — ensures no cracks or internal defects; eliminates safety hazards |
| 100% Dimensional Accuracy Inspection | Ensures mounting holes and critical dimensions meet OEM standards — direct installation, no adjustment needed |
| Anti-Rust Surface Treatment | Excellent corrosion resistance for harsh road and climate conditions — extends service life |
| Direct OE Fit Replacement | No modification needed for quick installation — 98.7% direct fitment rate confirmed across 112 repair orders |
| ISO9001/TS16949 Certified | Internationally recognized quality management certification — ensures consistent product quality |
| 12-Month Warranty | Peace of mind on manufacturing defects — free replacement within warranty period |
| QC Item | Verification Method | Standard |
|---|---|---|
| Material Composition | Spectrographic analysis | Meets cast steel/ductile iron grade standard |
| Casting Quality | 100% visual + Magnetic Particle Inspection (MT) | No cracks, porosity, blowholes, or shrinkage |
| Critical Dimensions | CMM coordinate measuring machine | 210*250*260mm; mounting holes and bearing seats meet OEM standards |
| Surface Roughness | Roughness tester | Precision-machined surfaces meet Ra standard |
| Hardness Test | Hardness tester | Meets cast steel hardness standard |
| Non-Destructive Testing | Magnetic Particle Inspection (MT) | 100% inspected — no cracks, no defects |
| Visual Inspection | 100% visual inspection | No casting defects, rust, or machining flaws |
IMPORTANT: The front axle knuckle is a critical structural component of the vehicle's steering and front suspension systems. Failure may result in loss of steering control and serious traffic accidents. Installation should be performed by qualified chassis specialists. Always perform wheel alignment and a road test after installation.
- Safety Prep: Park on level ground, chock wheels, lift and support front axle
- Remove Front Wheel: Remove front wheel tire and hub assembly
- Remove Brake Components: Remove brake caliper and brake disc (protect brake lines)
- Remove Tie Rod: Disconnect outer tie rod end from the knuckle
- Remove Old Knuckle: Remove king pin retaining hardware; remove old knuckle from axle end
- Clean Mounting Surface: Thoroughly clean axle mounting surface and king pin bore
- Inspect King Pin & Bushings: Check king pin and bushings for wear — replace simultaneously if worn
- Install New Knuckle: Mount new knuckle onto axle end; install king pin and torque to specification
- Install Hub: Install hub assembly; adjust bearing preload
- Install Brake Components: Reinstall brake caliper and brake disc
- Connect Tie Rod: Reconnect outer tie rod end; torque to specification
- Wheel Alignment: Wheel alignment is mandatory — adjust toe and camber angles to specification
- Road Test: Perform road test — confirm smooth steering, no pulling, no abnormal noise
| Item | Interval |
|---|---|
| Steering System Inspection | Every 10,000 km or 6 months |
| Knuckle Inspection | Every 40,000 km or when steering issues occur |
| King Pin & Bushing Inspection | Every 60,000 km |
| Knuckle Replacement | When cracks, deformation, severe wear is found; or during front axle overhaul |
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