PC400-7 PC450-7 708-2G-00020 708-2G-00022 HPV160 Hydraulic Main Pump Assembly Compatible with Komatsu

1. Product Overview & Wholesale Price Range

The Komatsu PC400-7 / PC450-7 HPV160 Hydraulic Main Pump Assembly (OEM Part # 708-2G-00020 / 708-2G-00022 / 708-2G-00024 / HPV160) is a high-pressure dual variable axial piston main pump engineered for 40-to-45-ton heavy mining excavators working under extreme quarrying, rock ripping, and mass excavation environments.

• Factory Wholesale Price: $6,500 – $11,800 USD (Direct manufacturer pricing — Save up to 50% vs regional dealer markups)
• MOQ & Bulk Discount: 1 Unit (Tiered wholesale discounts available for batch container orders)
• Lead Time: 1–3 business days (Large factory stock ready for immediate worldwide dispatch)
• Warranty: 12 Months full replacement warranty with 100% bench test video proof

2. Application Worksite Checklist (施工场景清单)

Engineered with high-strength alloy swashplates and heavy-duty roller bearings to handle continuous 380 Bar pressure peaks:

• Open-Pit Rock Mining & Quarrying: Massive continuous flow output under high working pressure for rapid heavy truck loading on Komatsu PC400-7 excavators.
• Deep Foundation & Bulk Rock Excavation: Dual-circuit hydraulic stability during simultaneous boom lifting, bucket curling, and swing cycles on Komatsu PC450-7 excavators.
• Highway Trenching & Infrastructure Projects: Precise electronically-controlled displacement for fuel-efficient long-hour earthmoving work.
• Demolition & Heavy Concrete Crushing: Reinforced cast iron pump housing built to absorb continuous high hydraulic pressure shocks from heavy shear and breaker attachments.

3. Hydraulic Main Pump Troubleshooting & Diagnostic Guide (液压泵常见故障排查)

If your 40–45 ton excavator is exhibiting hydraulic system failure, consult the diagnostic guide below:

• Fault 1: Cold Machine Operates Normally, But Machine Slows Down & Drops Pressure After 1 Hour (冷车正常,热车掉压发慢)
  Root Cause: Thermal expansion wear gap between the piston shoes, cylinder block, and distributor valve plate, causing internal high-pressure oil thermal bypass.
  Solution: Replace with a complete drop-in HPV160 main pump assembly (OEM 708-2G-00020) or perform a complete rotary group overhaul.
• Fault 2: Engine Stalls or Overloads When Actuating Hydraulic Boom/Arm (憋车/发动机过载熄火)
  Root Cause: HPV160 pump regulator power-control spool jammed or hydraulic TVC pilot regulator valve miscalibrated.
  Solution: Recalibrate HPV160 regulator pilot valve or replace the complete regulator assembly to restore engine power matching.
• Fault 3: Hydraulic Oil Leakage From Drive Shaft Seal Area (主驱动轴封高压串油漏油)
  Root Cause: Clogged casing drain circuit line causing excessive internal housing backpressure, blowing out the drive shaft skeleton seal.
  Solution: Flush housing drain lines, replace front drive shaft seal, and check gear pilot pump relief pressure.
• Fault 4: Abnormal Cavitation Noise or Severe Vibration From Main Pump (泵体异响抖动/气蚀)
  Root Cause: Air suction at hydraulic inlet lines, contaminated oil suction filter, or worn drive shaft support bearings.
  Solution: Replace suction line seals, flush hydraulic fluid tank, and replace drive shaft roller bearings.
• Fault 5: Black Metallic Filings Found Inside Hydraulic Tank Filter (油箱内有黑粉或金属屑)
  Root Cause: Severe friction galling on swashplate shoe bronze layer or cylinder block face failure.
  Solution: Flush entire hydraulic piping system, clean main control valve, and install a new HPV160 main pump assembly.

4. Hot Machinery Replacement Parts Recommendation (5大品类热门推荐表)

Explore our factory-direct replacement hydraulic components compatible with major global excavator brands:

5. Frequently Asked Questions & Technical Support (QA 问答专区)

Q1: How do I verify if this HPV160 main pump fits my Komatsu PC400-7 excavator?
A: Check your original pump nameplate for OEM numbers 708-2G-00020, 708-2G-00022, or HPV160 stamp. You can also send us your machine serial number for instant fitment verification.

Q2: My Komatsu PC450-7 excavator stalls the engine when digging heavy rock. Will replacing the HPV160 pump solve it?
A: Yes, engine stalling is usually caused by a faulty HPV160 pump TVC regulator valve failing to stroke down under load. Installing our pre-calibrated HPV160 pump assembly restores correct engine power matching.

Q3: Is this Komatsu HPV160 hydraulic main pump bench tested before shipment?
A: Yes, every single HPV160 pump undergoes a 5-step factory bench test, verifying pressure up to 380 Bar and volumetric efficiency above 95%. A live test video is provided before shipping.