Truck bed failing to raise? Hydraulic system losing pressure? Your Komatsu HM400 Articulated Dump Truck relies on the Hydraulic Main Pump GP (7081W00450) for core operations. Our precision-engineered replacement delivers uncompromised performance:
✅ Exact OEM specifications (708-1W-00450)
✅ 3,500+ PSI pressure capacity
✅ Mining-grade durability
Catastrophic Failure Symptoms:
• Delayed bed lifting/dumping cycle
• Hydraulic whining under load
• Unstable load retention
• Oil leaks at pump housing
• Engine stalling during PTO operation
Technical Specifications:
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Part Numbers: 7081W00450, 708-1W-00450, GP-7081W00450
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Type: Gear-driven main hydraulic pump
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Flow Rate: 110 L/min @ 2,200 rpm
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Operating Pressure: 245 bar (peak)
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Compatible Models:
› HM400-1 (SN: 5001-UP)
› HM400-2 (SN: A50001-A59999)
› HM400-3 (SN: B50001-B59999)
› HM400-5 (SN: D50001-D59999)
Engineering Advantages:
▶ Forged alloy housing – withstands mining vibration
▶ Hardened helical gears – 30% longer lifespan
▶ Triple-lip shaft seals – prevents contaminant ingress
▶ ISO 9001 & Komatsu TEC-certified
Proven Field Performance:
“After replacing with 7081W00450 pumps, our HM400-3 fleet reduced hydraulic failures by 78%” – Quarry Operations Report, 2024
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