HPD56

Komatsu HPD56 — axial piston hydraulic pump

The Komatsu HPD56 hydraulic pump is a variable displacement duplex axial piston pump developed in-house by Komatsu, belonging to the HPD series. It features a single shared cylinder block with one common inlet port and two independent outlet ports. During working operations both outlets are combined into a single circuit through a control valve, providing maximum flow; when the machine is travelling the outlets operate independently. It is the main hydraulic pump for Komatsu 12–14 tonne class excavators.

Full model range in the section Komatsu HPD series.

Technical specifications HPD56

• Type: axial piston, swash plate, duplex, variable displacement
• Displacement: 56 cm³ per section
• Cylinder block: 10 pistons

Installed in equipment

• Komatsu

  • PC120-8 — Crawler excavator
  • PC120-9 — Crawler excavator
  • PC128UU-6 — Crawler excavator
  • PC130-8 — Crawler excavator
  • PC130-9 — Crawler excavator
  • PC138-8 — Crawler excavator
  • PC138-9 — Crawler excavator
  • PC138US-8 — Crawler excavator
  • PC138USLC-8 — Crawler excavator

OEM numbers HPD56

• Komatsu

  • 708-3D-00020
  • 708-3D-01020
  • 708-3D-00030
  • 708-3D-01030
  • 708-3D-04320

Spare part numbers HPD56

• Komatsu

  • 708-2L-23351
  • 708-3D-04420
  • 708-3D-04320
  • 708-3D-12130
  • 708-3D-13340
  • 708-3D-13330
  • 708-2L-23360
  • 708-7L-13140
  • 708-2L-23131
  • 708-2L-33160
  • 708-2L-34120

Spare parts for Komatsu HPD56

• Cylinder block Rotor
• Drive Shaft
• Separation Bush
• Ball guide
• Disk Spring
• Snap Ring
• Slider
• Coupling of drive shaft
• Cylinder block press pin
• Charge Pump
• Roller Bearing
• Cradle Bearing Set
• Retainer Plate
• Swash plate (cam rocker)
• Piston shoe
• Rotor Spring
• Seal kit pump
• Shaft Seal
• Wire
• Valve plate
• Ball guide washer
• Pressure Override Valve
• Control Valve Regulator
• Regulator assembly
• Servo Piston

Repair and service HPD56

Diagnostics and repair of axial piston hydraulic pump Komatsu HPD56: monitoring operating pressure and leaks, inspection of the piston group and valve plate, and bench testing after repair.

Contact us — we will repair hydraulic pump HPD56 and select genuine spare parts.