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High-Torque Hydraulic Main Pump for Komatsu D155A Bulldozers (Part # 708-1T-00472 / 7081T00472)

Restore factory-grade hydraulic performance to your Komatsu bulldozer with this precision-engineered Hydraulic Main Pump GP (708-1T-00472). Manufactured to original Komatsu specifications, this aftermarket solution delivers identical pressure curves and flow rates for demanding earthmoving operations.

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✅ Detailed Machine Compatibility

Fits Komatsu Models:

  • D155A-1 (S/N: 50001-59999)

  • D155A-2 (S/N: 60001-79999)

  • D155A-3 (S/N: 80001-A29999)

  • All blade configurations: U-blade, S-blade, PAT blade

  • Winch and ripper-equipped variants

  • Models with closed-center hydraulic systems

⚙️ Technical Specifications

  • Pump Type: Axial piston variable displacement

  • Flow Capacity: 185 L/min @ 2,000 RPM (48.9 GPM)

  • Operating Pressure: 3,335 PSI (230 bar)

  • Displacement: 100 cm³/rev

  • Fluid Compatibility: Komatsu HHF-1/2, ISO VG 46

  • Port Configuration: 1″ SAE J1926 ORFS fittings

  • Weight: 28.5 kg (62.8 lbs)

🔧 Performance Advantages

  • Precision-Matched Curves: ±3% deviation from OEM specs

  • Thermal Management: Operates -30°C to 120°C (-22°F to 248°F)

  • Anti-Wear Design: Hardened steel swashplate & valve plate

  • Zero-Leak Seals: Quad-lip shaft seal (FKM/Viton®)

  • Vibration Damping: Precision-balanced piston group

  • Plug-and-Play Installation: No hydraulic system flushing required

⚠️ Critical Failure Indicators

Immediate replacement recommended when observing:

  • Slow blade response (>4-second cycle time)

  • Hydraulic whining during ripping operations

  • Oil temperature exceeding 95°C (203°F)

  • Pressure drop >20% at standard RPM

  • Metal particles in hydraulic filter (ISO 18/15)

  • Error codes: KOMTRAX Alert 325-3

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