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Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Specifications
Model Number :
PC75UU-2 PC75UD-2
Warranty :
6 Months
Price :
Negotiable
Packaging Details :
Wooden Case / Cartonwith Foam Protection, or as Required
Part No :
21W-60-22111
Supply Ability :
300pcs/day
Delivery Time :
3-8 days
Condition :
New / Rebuilt
Place of Origin :
China
Product Name :
Hydraulic Pump Assembly
Transportation Method :
DHL, UPS, FedEx, Sea Freight
Brand Name :
CAVOYD
Payment Terms :
T/T
MOQ :
1 set
MOQ :
1 Set
Applicable Model :
PC75UU-2 PC75UD-2
Description
Excavator Hydraulic Pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main Piston Pump
Komatsu PC75UU-2 Hydraulic Pump Common Faults

The main pump is an A10VD43 variable displacement piston pump fitted with a tandem gear pump. Primary failure causes for this legacy model include contaminated hydraulic fluid, suction-side air ingress, and seized regulator assemblies.

1. Sluggish Operation, Insufficient Output Pressure
Symptom: Normal no-load function; marked pressure degradation under load.
Cause: Internal leakage induced by worn valve plates / piston shoes; seized regulator spool or failed springs.

External factors: Blocked suction filter, suction line air leakage, metallic particulates in hydraulic fluid.

Diagnosis: Excessive case drain flow indicates internal pump wear.

2. Abnormal Pump Acoustics, High-Pitched Squealing and Excessive Vibration
  • High-pitched squeal (Cavitation): Inadequate suction or air entrainment; milky, foamy hydraulic fluid.
  • Metallic tapping: Failed bearing / ball joint assembly, misaligned coupling.
3. Engine Lugging, Speed Reduction or Stall Under Loaded Conditions
Cause: Seized power control spool. The pump remains at maximum displacement and consumes excess engine power.

Diagnostic: Isolate regulator control oil supply. If lugging ceases, the regulator is defective.

4. Elevated Hydraulic Fluid Temperature
Symptom: Rapid temperature rise during operation, accompanied by progressive reduction in operating speed.
Cause: Severe internal leakage; obstructed case drain circuit leading to elevated case pressure.
Note: Confirm radiator and return filter are free of blockage prior to pump assessment.
5. Main Shaft Oil Seal Leakage
Cause: Degraded seal; high case pressure; seal damage from coupling misalignment.

Risk: A compromised seal will draw in air, inducing cavitation and accelerating pump deterioration.

6. Jerky Actuation and Pressure Fluctuation
Cause: Air trapped within the hydraulic circuit; erratic regulator response; localized scoring on valve plate.
7. Tandem Pilot Gear Pump Malfunction
Symptom: Unstable pilot pressure and irregular main pump displacement modulation.
Cause: Gear tooth wear, seal leakage, internal fluid bypass.
On-site Troubleshooting Procedure
  1. Inspect hydraulic fluid condition, fluid level, suction filter and suction hose
  2. Measure maximum main pump pressure and pilot pressure; cross-reference with service manual specifications
  3. Take pump case drain flow readings
  4. Disassemble and clean regulator; inspect spring integrity
  5. Verify coupling concentricity
Repair Specifications
  • Minor wear: Lap valve plate, renew pistons, piston shoes, ball joint and seal kit; perform regulator cleaning.
  • Severe scoring: Fit new or remanufactured complete pump assembly.
  • Post-repair: Replace all hydraulic filters and thoroughly clean the hydraulic tank.
Product Images
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Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump

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Product Detail
Model Number :
PC75UU-2 PC75UD-2
Warranty :
6 Months
Price :
Negotiable
Packaging Details :
Wooden Case / Cartonwith Foam Protection, or as Required
Part No :
21W-60-22111
Supply Ability :
300pcs/day
Contact Supplier
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump
Excavator hydraulic pump 21W-60-22111 Komatsu PC75UU-2 PC75UD-2 Main piston pump

Guangzhou Kawo Construction Machinery Co.,Ltd.

Verified Supplier
1 Years
guangdong, guangzhou
Since 2017
Business Type :
Trading Company, Manufacturer
Main Products :
Construction Hydraulic Pump, Excavator Hydraulic Pump, Hydraulic Control Valve
Total Annual :
$1 Million -US$5 Million
Employee Number :
80~100
Certification Level :
Verified Supplier
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