HINO 500 RANGER MEGA FG1J FM1J GH1J J08C J08CT 20T LH 16.0ML 130BAR HEAVY DUTY HYDRAULIC POWER STEERING PUMP (OE: 44310-2790 / S44310-2790 / S4431-02790)

Overview

The Hino FG1J / FM1J / GH1J J08C Hydraulic Power Steering Pump (P/STG Pump Assembly 44310-2790 / S44310-2790) is a heavy-duty hydraulic steering component engineered specifically for Hino 500 Series, Ranger, and Mega heavy commercial transport trucks powered by the Hino J08C and J08C-T 8.0L 6-cylinder diesel engine (FG1J, FM1J, GH1J, and related heavy cargo lorries, wooden body trucks, tippers, dump trucks, concrete mixers, and prime movers equipped with gear-driven hydraulic power steering systems). Built in the Left-Hand (LH) rotation, 20-Tooth (20T) helical drive gear, standard 2-bolt flange mounting configuration, this high-output hydraulic vane pump delivers a steady, calibrated hydraulic flow rate of 16.0 L/min at up to 130 bar operating pressure directly to the power steering gearbox. Replacing a worn, whining, or leaking power steering pump eliminates heavy or stiff steering, cures steering wheel shuddering at low engine idling RPM, prevents hydraulic oil aeration/cavitation, and restores smooth, effortless steering control under heavy commercial payloads.

Engineered to heavy commercial fleet specifications for dependable workshop replacement, steering system overhaul, and preventive chassis maintenance.

Key Dimensions (As Labeled in Product Photos)

• Mounting Configuration: Standard heavy-duty 2-bolt flange mounting (direct engine timing gear casing mount)

• Drive Mechanism: Precision-machined 20-Tooth (20T) helical drive gear (Left-Hand / LH rotation)

• Rotation Direction: Left-Hand (LH) rotation

• Operating Specifications: Nominal displacement 16.0 ml/r, Maximum operating pressure 130 bar, Operating speed range 500–3600 r/min, Controlled flow rate 16.0 L/min

• Hydraulic Ports: Standard 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 2-bolt mounting flange center-to-center pitch, pilot spigot diameter, 20T drive gear outer diameter, tooth pitch, and hydraulic port dimensions are labeled directly in the product photos.

• Please verify your existing pump rotation (LH), 20-tooth count, and 2-bolt flange profile against the measurements shown in our photos before ordering.

Compatible Truck Models & Engine Applications

• HINO TRUCKS: 500 Series, Ranger, Mega (FG1J, FM1J, GH1J Heavy Commercial Cargo Lorries, Wooden Body Trucks, Tippers, Dump Trucks, Concrete Mixers & Prime Movers)

• Engine Application:

  • Hino J08C / J08C-TI / J08C-TT (8.0L 6-Cylinder Turbo Diesel)

  • Hino J08E (7.7L 6-Cylinder Common Rail Turbo Diesel)

• OEM & Cross-Reference Part Numbers:

  • 44310-2790 (Hino Genuine OEM)

  • S44310-2790 (Hino Official EPC Format)

  • S4431-02790

  • 44310-2362 / S44310-2362

• (Note: In the Malaysian commercial truck market, Hino FG1J, FM1J, and GH1J heavy chassis running J08C engines require Left-Hand [LH] rotation with a 20T gear. Do not confuse this with the Right-Hand [RH] rotation 20T pump used on lighter FD1J/FC4J models [44310-2232]. Please verify your pump rotation direction [LH] prior to ordering.)

Why Choose Our Commercial Truck Parts?

• Calibrated High-Pressure Hydraulic Flow (16.0 ml/r, 130 bar): Precision-machined internal rotor and vanes provide continuous, smooth 16.0 L/min hydraulic assistance even at low engine idling speeds, minimizing driver fatigue during tight maneuvers.

• Induction-Hardened 20T LH Drive Gear: High-grade heat-treated 20-tooth gear profile resists gear tooth pitting, backlash, and premature wear against the engine timing gear train.

• Integrated Flow Control & Relief Valve: Factory-calibrated 130-bar 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 (20T) / Rotation (LH) / sample photos to our team via WhatsApp for instant confirmation!