ISUZU ELF NPR NKR NPS NPR66 HICOM PERKASA MTB150 4HF1 4HG1 4HE1 4.3L 4.6L 4.8L 30T RH 100BAR HYDRAULIC POWER STEERING PUMP (OE: 8-97155-134-0 / 8-97115-134-0 / 8-97115-135-0 / 8971551340 / 8971151340)

Overview

The Isuzu Elf NPR66 / 4HF1 Hydraulic Power Steering Pump (P/STG Pump Assembly 8-97155-134-0 / 8-97115-134-0 / 8-97115-135-0) is a commercial-grade hydraulic steering component engineered specifically for Isuzu Elf, N-Series, and Hicom Perkasa commercial transport trucks powered by Isuzu 4HF1 (4.3L), 4HG1 (4.6L), and 4HE1 (4.8L) 4-cylinder diesel engines (Isuzu NPR66, NKR66, NPS66, NPR71, and Hicom Perkasa MTB150 series commercial cargo lorries, wooden body trucks, tippers, dump trucks, box vans, and tow trucks equipped with gear-driven hydraulic power steering systems). Built in the Right-Hand (RH) rotation, 30-Tooth (30T) helical drive gear, heavy-duty engine timing gear flange mounting configuration, this precision hydraulic vane pump delivers a steady, calibrated hydraulic flow rate of 7.5–9.0 L/min at up to 100–110 bar operating pressure directly to the power steering gearbox. Replacing a worn, whining, stiff, or leaking power steering pump eliminates heavy steering effort, cures steering wheel shuddering and judder at engine idle RPM, prevents hydraulic oil cavitation/aeration, and restores smooth, effortless steering control under heavy commercial payloads.

Engineered to commercial fleet specifications verified against Malaysian commercial light truck standards for dependable workshop replacement, steering system overhaul, and preventive chassis maintenance.

Key Dimensions (As Labeled in Product Photos)

• Mounting Configuration: Heavy-duty flange mounting (direct engine timing gear casing mount)

• Drive Mechanism: Precision-machined 30-Tooth (30T) helical drive gear (Right-Hand / RH rotation)

• Rotation Direction: Right-Hand (RH) rotation

• Drive Type: Direct engine timing gear driven

• Operating Specifications: Nominal displacement 9.6–11.0 ml/r, Maximum operating pressure 100–110 bar, Operating speed range 500–6000 r/min, Controlled flow rate 7.5–9.0 L/min

• Hydraulic Ports: Threaded high-pressure discharge port (for banjo bolt or flare fitting) & suction feed inlet tube connection with O-ring seal

• Measurement Notice: Key specifications including mounting flange bolt center-to-center pitch, pilot spigot diameter, 30T drive gear outer diameter, tooth pitch, and hydraulic port dimensions are labeled directly in the product photos.

• Please verify your existing pump rotation (RH), 30-tooth count, and mounting flange profile against the measurements shown in our photos before ordering.

Compatible Truck Models & Engine Applications

• ISUZU COMMERCIAL TRUCKS:

  • Elf / N-Series (NPR66, NKR66, NPS66, NPR70, NPR71 Commercial Cargo Trucks, Wooden Body Lorries, Tippers, Dump Trucks & Box Vans)

• HICOM COMMERCIAL TRUCKS:

  • Perkasa Series (MTB150 4.3L Commercial Light Lorries)

• Engine Application:

  • Isuzu 4HF1 / 4HF1-N (4.3L 4-Cylinder Naturally Aspirated Direct Injection Diesel)

  • Isuzu 4HG1 / 4HG1-T (4.6L 4-Cylinder Diesel / Turbo Diesel)

  • Isuzu 4HE1 / 4HE1-T (4.8L 4-Cylinder Turbo Diesel)

• OEM & Cross-Reference Part Numbers:

  • 8-97155-134-0 / 8-97155134-0 / 8971551340

  • 8-97115-134-0 / 8-97115134-0 / 8971151340

  • 8-97115-135-0 / 8-97115135-0 / 8971151350

  • 8-97155-135-0 / 8-97155135-0

• (Note: In the Malaysian commercial lorry market, Isuzu 4HF1/4HG1 models on NPR66 and Hicom MTB150 chassis run this 30T gear-driven pump. Please confirm your original pump rotation direction [RH vs LH], gear tooth count [30T], and flange profile prior to ordering.)

Why Choose Our Commercial Truck Parts?

• Calibrated High-Pressure Hydraulic Flow (100–110 bar): Precision-machined internal rotor and vanes provide continuous, smooth 7.5–9.0 L/min hydraulic assistance even at low engine idling speeds, minimizing driver steering effort.

• Induction-Hardened 30T RH Drive Gear: High-grade heat-treated 30-tooth gear profile resists gear tooth pitting, backlash, and premature wear against the engine timing gear train.

• Heavy-Duty Cast Housing: Rigid cast housing ensures structural alignment and eliminates leakage or casing warping under continuous hydraulic operating pressure.

• Integrated Flow Control & Relief Valve: Factory-calibrated internal pressure relief valve ensures stable line pressure while preventing high-pressure line bursts during full steering lock.

• High-Grade Oil Seals: Heat- and oil-resistant internal seals prevent hydraulic steering fluid from leaking into the engine oil crankcase.

• Ready Stock & Fast Shipping: Readily stocked for quick dispatch across Peninsular and East Malaysia.

Need Help Confirming Fitment?

Unsure whether this power steering pump matches your lorry's existing engine setup?

• Check your old pump against the measurements shown in our pictures.

• Or send your Chassis Number (VIN) / Engine Model / Gear Teeth Count (30T) / Rotation (RH) / sample photos to our team via WhatsApp for instant confirmation!