ISUZU NPR 4HF1 Power Steering Pump 8-97136574-1 OEM Fit
Key Attributes
Product Summary
Brand new vane-type hydraulic power steering pump for ISUZU NPR/NQR/NPS with 4HF1/4HE1/4HG1T engines. OEM 8-97136574-1 direct fit, 100% inspected, 3.5kg lightweight aluminum, integrated flow and safety valves. 3–12 month warranty, neutral or custom packaging, small MOQ accepted.
Product Details
ISUZU NPR 4HF1 power steering pump
,OEM 8-97136574-1 steering pump
,ISUZU NPR direct-fit steering pump
Power Steering Oil Pump Assembly 8-97136574-1 / 8971365741 for ISUZU NPR, NQR and NPS trucks equipped with 4HF1, 4HE1 and 4HG1T diesel engines. Verified OEM-fit hydraulic steering pump, Figure No. 436-001.
The Power Steering Oil Pump Assembly with OEM numbers 8-97136574-1 and 8971365741 is a verified direct-fit replacement for ISUZU NPR / NQR / NPS series trucks equipped with 4HF1 / 4HE1 / 4HG1T diesel engines. This steering pump is the core power source of the hydraulic power steering system, responsible for converting the engine's mechanical energy into hydraulic energy to provide stable, continuous hydraulic assistance to the steering gear, ensuring light and precise steering operation even at low speeds and under heavy loads.
The power steering pump is driven by the engine via a gear or belt, draws steering fluid from the reservoir, pressurizes it, and delivers it to the steering gear. When the driver turns the steering wheel, the steering gear uses the hydraulic pressure to push the steering arm (or rack), turning the wheels.
This assembly employs a vane-type hydraulic pump design: the rotor and cam ring are eccentrically arranged, and the vanes, under centrifugal force and hydraulic pressure, press against the cam ring inner surface, creating cyclic changes in sealed volume for oil suction and delivery. The pump incorporates an internal flow control valve and a safety valve (relief valve), ensuring a stable controlled flow across varying engine speeds and automatically relieving pressure when the system exceeds the preset limit, protecting the entire hydraulic assist system from overload damage.
The 4HF1 is a 4.3L inline-four diesel engine, the 4HE1 is a 4.8L variant, and the 4HG1T is a 4.6L turbocharged variant, all widely used in ISUZU NPR/NQR series trucks.
Replace the power steering pump when any of these symptoms appear:
- Heavy or stiff steering — internal pump wear causes insufficient output pressure and flow, most noticeable at low speeds or idle.
- Whining or hissing noise during steering — worn internal bearings, sticking vanes, or air ingress in the system increase operating noise.
- Steering fluid leakage — aged pump seals (oil seals, O-rings) allow fluid to seep from the pump shaft or housing joints.
- Steering wheel vibration or pulsation — a faulty flow control valve or internal pressure fluctuations cause uneven steering feel.
- Darkened steering fluid or metal debris — severe internal pump wear contaminates the hydraulic system with metal particles, potentially damaging the steering gear further.
- Complete loss of assist — a broken pump shaft or seized internal mechanism eliminates hydraulic assistance, making steering extremely heavy.
| Verification Item | Data / Standard | Source / Method |
|---|---|---|
| Primary OEM | 8-97136574-1 / 8971365741 | DEAUTO; Persian Autopart-Masters; Amazon |
| Official Part Name | PUMP ASM; OIL, P/S | Persian Autopart-Masters (Persian product page) |
| Vehicle Models | ISUZU NPR / NQR / NPS / NP / NQ | eBay (compatibility list); Amazon; Persian product page |
| Engine Compatibility | 4HF1 / 4HE1 / 4HG1T | eBay; Amazon; Persian product page |
| Net Weight | 3.5 kg | Persian Autopart-Masters |
| H/S Code | 841360100 | Persian Autopart-Masters |
| Figure Number | 436-001 | Persian Autopart-Masters |
| Pack Quantity | 1 PCS | Persian Autopart-Masters |
| Cross-Reference / Interchange | 8-97136574-0 / 8971365740 | eBay; FridayParts |
| Cross-Reference / Interchange | 8-97115135-0 / 8971151350 | Persian product page; Guneybaglilar |
| Cross-Reference / Interchange | 8970851282 / 8-97085128-2 | FridayParts; repareparts.ru |
| Cross-Reference / Interchange | 8973886510 / 8973572130 | eBay; Guneybaglilar |
| Brand | IZUMI / Loautong, etc. | Amazon; DEAUTO |
| Warranty | 3–12 Months (varies by supplier) | Persian product page (3 months); Manufacturer standard |
| Part Number | 8-97136574-1 | Product Name | Power Steering Pump |
|---|---|---|---|
| Car Model | NPR | Engine Model | 4HF1 |
| Condition | 100% Brand New | Size | Standard |
| Weight | Standard | Origin | China Mainland |
| Main Market | Middle East, Asia, Africa, South America, North America & Europe | Package | Neutral Packing Or Make It As Requested |
| Material | High-strength aluminum alloy & precision bearings | Cooling Type | Engine coolant circulation |
| Installation | Direct OEM replacement | Quality Standard | OEM equivalent / ISO quality control |
| Brand | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| ISUZU | NPR | NPR | 4HF1 / 4HE1 | 1990s–2000s |
| ISUZU | NQR | NQR70 / NQR75 | 4HF1 / 4HE1 / 4HG1T | 1996–2000s |
| ISUZU | NPS | NPS66 / NPS71 | 4HF1 | 1990s–2000s |
| ISUZU | NP / NQ | — | 4HF1 / 4HE1 | — |
| ISUZU | ELF | — | 4HF1 / 4HE1 / 4HG1T | 1990s–2000s |
| Engine Model | Displacement | Common Applications |
|---|---|---|
| 4HF1 | 4.3L Diesel | NPR, NQR70, NPS66, ELF |
| 4HE1 | 4.8L Diesel | NPR, NQR70, NQR75 |
| 4HG1T | 4.6L Turbo | NQR71, NPR71 |
- 8-97136574-1 is the current version; 8-97136574-0 is the earlier version — they are interchangeable. Verify against your original component.
- This product is the pump assembly and does not include the steering fluid reservoir, belt, or pulley (depending on configuration). Confirm the original pump's drive type (gear/belt) and port configuration before ordering.
- Before replacing the steering pump, the steering system must be thoroughly flushed and the fluid replaced. Never reuse old steering fluid.
- The system must be thoroughly bled after installation, and fluid level and leaks checked.
- For gear-driven pump assemblies, ensure correct gear mesh during installation — never hammer.
- For right-hand drive (RHD) vehicles, verify line routing. Refer to the ISUZU workshop manual.
| Feature | Benefit + Verification Signal |
|---|---|
| Vane-Type Hydraulic Pump Design | Compact, smooth-running design delivering stable hydraulic assistance across a wide speed range — verified by product working principle description. |
| Fits 4HF1 / 4HE1 / 4HG1T Main Engine Platforms | Covers the vast majority of ISUZU NPR/NQR diesel configurations for broad application coverage — verified by eBay compatibility list and Amazon application data. |
| Integrated Flow Control Valve & Safety Valve | Automatically regulates output flow and prevents system overpressure, protecting the steering gear, lines, and seals — verified by working principle description. |
| Lightweight (3.5 kg) | Lighter than comparable cast-iron pumps for easier installation and reduced front axle load — verified by Persian Autopart-Masters net weight data. |
| Broad Cross-Compatibility | Interchangeable with 8-97136574-0, 8-97115135-0, 8970851282 and other OEM numbers for easier procurement and inventory management — verified by eBay, FridayParts, and Persian product page cross-reference data. |
| Small MOQ Accepted | Accepts small trial orders and emergency repair quantities — verified by Persian product page MOQ policy. |
| QC Item | Verification Method / Standard |
|---|---|
| Pump Housing Mounting Holes | CMM, 100% inspection |
| Shaft Diameter & Spline/Gear | CMM, 100% inspection |
| Inlet / Outlet Port Dimensions | CMM / thread gauge, 100% inspection |
| Flow Characteristics | Flow test bench, 100% inspection |
| Pressure Characteristics | Pressure test bench, 100% inspection |
| Relief Valve Opening Pressure | Pressure test bench, 100% inspection |
| Internal Leakage | Leakage test, 100% inspection |
| Rotation Flexibility / Noise | Functional test, 100% inspection |
| Material Hardness | Rockwell hardness tester, batch sampling |
| Surface Finish | Visual inspection — no cracks, no porosity, no corrosion |
| Batch Traceability | Material lot number + production date |
| Packaging Protection | Anti-rust oil + VCI film + carton |
- Preparation: Disconnect the battery negative terminal. Place a drain pan under the steering pump. Remove the drive gear/belt.
- Removal: Disconnect the inlet and outlet lines from the steering pump. Remove the pump mounting bolts and withdraw the old pump.
- Inspection: Inspect the mounting bracket for cracks or deformation. Check the lines and fittings for damage or blockage. Inspect the drive gear/belt for wear.
- Installation: Install the new pump onto the bracket and torque the mounting bolts to specification. Ensure correct gear mesh — never hammer. Connect the inlet and outlet lines.
- Filling & Bleeding: Fill the reservoir with the specified new steering fluid. With the engine at idle, turn the steering wheel lock-to-lock several times to bleed air from the system. Check and top up the fluid level.
- Leak Check: Inspect all fittings, the pump body, and lines for leaks.
- Road Test: Perform a road test to verify proper steering assist, absence of abnormal noise, and no leaks.
| Fastener | Torque |
|---|---|
| Steering Pump Mounting Bolts | Per ISUZU workshop manual specification |
| Outlet Line Fitting | Per ISUZU workshop manual specification |
| Inlet Line Clamp | Per ISUZU workshop manual specification |
- Every 10,000 km: Check steering fluid level and condition. Inspect the pump and lines for leaks.
- Every 40,000–50,000 km: Inspect drive gear/belt wear. Check the pump for abnormal noise during operation.
- Every 2 years: Replace the steering fluid and thoroughly flush the system.
- When steering feels heavy or abnormal noise is detected: Inspect pump pressure, flow, and system sealing immediately.
- Standard Packaging: Anti-rust oil + VCI film + neutral carton.
- Custom Packaging: Neutral box, color box, or customer-branded packaging.
- Suitable For: Steering system repair shops, ISUZU parts distributors, fleet maintenance centers.
- Supply Capacity: Stable batch supply with batch-level quality reports available.
- MOQ: Small quantities accepted (quantity discounts available).
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