SK120-6 SK140SR R140LC-7 YN10V00004F1 31Q4-10010 Kawasaki K3V63 Hydraulic Main Pump Assembly Compatible with Kobelco Hyundai

The Kawasaki K3V63 / K3V63DT Hydraulic Main Pump Assembly (OEM Part # YN10V00004F1 / 31Q4-10010 / 2401-9236) is an axial piston tandem dual pump engineered for 12-to-15-ton mid-size excavators operating under high-frequency digging, trenching, and utility works.

• Price Range: $4,500 – $7,800 USD (Complete Drop-In Pump Assembly vs Rotary Group Kit)
• Lead Time: 1–3 business days (Ready to ship in stock)
• Warranty: 12 Months factory warranty with 100% dynamic bench test video proof

Precision-matched flow displacement designed to excel in various demanding field environments:

• Urban Infrastructure & Utility Trenching: Precise hydraulic metering for pipe laying and narrow trench digging with Kobelco SK140SR short-radius machines.
• Road Repair & Earthmoving: Sustained hydraulic pressure for rapid bucket-and-arm loading cycles on Hyundai R140LC-7 excavators.
• Forestry & Land Clearing: High-pressure oil flow stability under thermal load during brush cutting and stump pulling.
• Demolition & Foundation Prep: Heavy-duty swashplate bearings built to absorb continuous pulsation and breaker tool feedback pressure.

If your 12–15 ton excavator is exhibiting hydraulic system anomalies, 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: Excessive thermal wear gap between the cylinder block, pistons, and valve plate, causing internal high-pressure oil thermal bypass.
  Solution: Replace with a complete drop-in K3V63 main pump assembly (OEM YN10V00004F1) or perform a complete rotary group overhaul.
• Fault 2: Engine Stalls or Overloads When Actuating Hydraulic Boom/Bucket (憋车/发动机过载熄火)
  Root Cause: K3V63 pump regulator power-control spring jammed or hydraulic regulator pilot valve miscalibrated.
  Solution: Recalibrate K3V63 regulator pilot valve or replace the regulator assembly to match engine horsepower curves.
• Fault 3: Hydraulic Oil Leakage From Drive Shaft Seal Area (主驱动轴封高压串油漏油)
  Root Cause: Clogged pump housing drain circuit line causing excessive internal casing pressure, blowing out the front skeleton shaft seal.
  Solution: Flush housing drain lines, replace the drive shaft seal, and check pilot gear 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 entering hydraulic suction inlet lines, contaminated oil filter, or worn swashplate drive shaft 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 K3V63 main pump assembly.

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

Q1: How do I verify if this K3V63 pump is compatible with my Kobelco SK120-6 excavator?
A: Check your original main pump nameplate for OEM numbers YN10V00004F1, YN10V00018F1, or K3V63DT stamp. You can also send us your machine serial number for immediate fitment verification.

Q2: My Hyundai R140LC-7 excavator stalls the engine when lifting the boom. Will replacing the K3V63 pump solve this?
A: Yes, engine stalling is usually caused by a faulty K3V63 pump regulator valve failing to stroke down when system pressure rises. Installing our pre-calibrated K3V63 pump assembly restores correct engine-pump power matching.

Q3: Is this Kawasaki K3V63 main pump tested before shipment?
A: Yes, every single K3V63 pump undergoes a 5-step factory bench test, verifying pressure up to 350 Bar and volumetric efficiency above 95%. A live test video is provided before shipping.