HINO DUTRO 300 TOYOTA DYNA WU300 WU342 WU410 XZU410 N04C N04CT 4.0L 23T RH 13.6ML 110BAR HEAVY DUTY HYDRAULIC POWER STEERING PUMP (OE: 44310-37230 / S44310-37230 / S4431-03723)

Overview

The Hino Dutro / Toyota Dyna WU300 N04C-T Hydraulic Power Steering Pump (P/STG Pump Assembly 44310-37230 / S44310-37230) is a commercial-grade hydraulic steering component engineered specifically for Hino Dutro, 300 Series, and Toyota Dyna light-to-medium commercial transport trucks powered by the Hino N04C and N04C-T 4.0L 4-cylinder common rail turbo diesel engine (WU300, WU342, WU410, XZU410 series cargo lorries, wooden body trucks, box vans, tippers, and light commercial haulers equipped with gear-driven hydraulic power steering systems). Built in the Right-Hand (RH) rotation, 23-Tooth (23T) helical drive gear, standard 2-bolt flange mounting configuration, this hydraulic vane pump delivers a steady, calibrated hydraulic flow rate of 9.0–10.0 L/min at up to 110 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 23-Tooth (23T) helical drive gear (Right-Hand / RH rotation)

• Rotation Direction: Right-Hand (RH) rotation

• Operating Specifications: Nominal displacement 13.6 ml/r, Maximum operating pressure 110 bar, Operating speed range 500–3600 r/min, Controlled flow rate 9.0–10.0 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, 23T drive gear outer diameter, tooth pitch, and hydraulic port dimensions are labeled directly in the product photos.

• Please verify your existing pump rotation (RH), 23-tooth count, and mounting flange profile against the measurements shown in our photos before ordering.

Compatible Truck Models & Engine Applications

• HINO TRUCKS: Dutro, 300 Series (WU300, WU342, WU410, XZU410 Commercial Light & Medium Lorries, Cargo Trucks, Wooden Body Trucks, Tippers & Box Vans)

• TOYOTA COMMERCIAL: Dyna Series (WU300, WU342, WU410, XZU Series Light Trucks)

• Engine Application:

  • Hino N04C / N04C-T / N04C-TB / N04C-TJ (4.0L 4-Cylinder Common Rail Turbo Diesel)

• OEM & Cross-Reference Part Numbers:

  • 44310-37230 (Toyota / Hino Genuine OEM)

  • S44310-37230 (Hino Official EPC Format)

  • S4431-03723

  • 44310-37231 / S44310-37231

• (Note: In the Malaysian commercial truck market, Hino 300 / Dutro WU series pumps feature different gear tooth counts depending on the engine generation, such as 23T on N04C-T [44310-37230] vs. 24T on J05C/W04D [44310-1720 / 44310-37150]. Please confirm your original gear tooth count [23T] and engine model prior to ordering.)

Why Choose Our Commercial Truck Parts?

• Calibrated High-Pressure Hydraulic Flow (13.6 ml/r, 110 bar): Precision-machined internal rotor and vanes provide continuous, smooth hydraulic assistance even at low engine idling speeds, minimizing driver fatigue during tight maneuvers.

• Induction-Hardened 23T Drive Gear: High-grade heat-treated 23-tooth gear profile resists gear tooth pitting, backlash, and premature wear against the engine timing gear train.

• 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 (23T) / sample photos to our team via WhatsApp for instant confirmation!