Core Application
Direct replacement hydraulic pump for Komatsu backhoe loaders experiencing:
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Reduced bucket lifting capacity
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Slow boom extension/retraction
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Hydraulic system overheating
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Uncontrolled attachment drift
Compatibility Verification
| Equipment Model | Valid Serial Ranges |
|---|---|
| Komatsu WB93 | S/N 50001-59999 (WB93R-5E0) S/N 51001-51999 (WB93S-5E0) |
| Komatsu WB97 | S/N 70001-79999 (WB97R-5E0) S/N 71001-71999 (WB97S-5E0) |
Technical Specifications
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OEM Reference: 708-1U-01111 / 7081U01111
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Pump Type: Axial piston variable displacement
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Displacement: 45.6 cm³/rev (±0.8%)
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Operating Pressure: 28 MPa (4,060 PSI)
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Flow Rate: 82 L/min @ 2,200 rpm
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Temperature Tolerance: -25°C to 110°C continuous operation
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Fluid Requirements: ISO VG 46 hydraulic oil
Performance Restoration Features
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Pressure Stability
Maintains ±2% pressure deviation across operating range -
Cavitation Control
Helical inlet port design reduces vacuum formation -
Wear Resistance
Hardened steel swashplate (HRC 58-62) -
Sealing Integrity
Triple-lip shaft seal withstands 5,000+ PSI
Installation Parameters
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Mounting Torque: 98 Nm (72 ft-lb)
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Port Connections: SAE J518 Code 61 flange
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Alignment Tolerance: 0.08 mm maximum
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Priming Method: Self-bleeding circuit
Operational Verification Checklist
After installation confirm:
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Hydraulic oil temperature stabilizes below 82°C
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Bucket cycle time within 5% of factory specifications
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No audible pump whine at maximum pressure
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Zero external fluid leakage after 8-hour operation
Maintenance Indicators
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Daily: Check reservoir fluid level
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250 Hours: Inspect suction line integrity
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1,000 Hours: Fluid particulate count test
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2,000 Hours: Full pressure performance test
All products