Komatsu WA400 Pumps Guide

Komatsu WA400 pumps can vary by pump type, machine configuration, and serial number. This guide is designed to help customers researching pump applications for the Komatsu WA400 family move from general machine intent toward the correct part number.

Use this page to review example pump references by type, then continue through the pump hub system or use the site search once you have a likely part number. The Komatsu parts book for the exact machine serial number remains the final authority for fitment.

Common Model References in This Family

WA400-1, WA400-3-H, WA400-3-X, WA400-3A, WA400-3A-, WA400-3A-S, WA400-3A-ST, WA400-3A-SW, and more

Hydraulic Pumps

Below are example hydraulic pumps references associated with the Komatsu WA400 family. Some may be stocked products and others may be quote-based references depending on current catalog coverage.

  • 07952-70002 — Grease Pump Ass'Y
  • 423-947-1110 — Pump Ass'Y
  • 704-30-32110 — Pump Ass'Y,(See Fig.4801)
  • 704-30-34110 — Pump Ass'Y,(See Fig.4801)
  • 705-11-35010 — Pump Ass'Y,(See Fig.2601)

Water Pumps

Below are example water pumps references associated with the Komatsu WA400 family. Some may be stocked products and others may be quote-based references depending on current catalog coverage.

  • 6138-61-1560 — Water Pump Ass'Y,(With Non Hardening Pulley)
  • 6138-61-1570 — Water Pump Ass'Y,(With Hardening Pulley)
  • 6138-61-1660 — Water Pump Ass'Y,(Noise Suppression Spec.)
  • 6138-61-1850 — Water Pump Ass'Y,(For Large Fan)
  • 6138-61-1860 — Water Pump Ass'Y,(For Large And Reversible Fan)

Oil Pumps

Below are example oil pumps references associated with the Komatsu WA400 family. Some may be stocked products and others may be quote-based references depending on current catalog coverage.

  • 6136-52-1100 — Oil Pump Ass'Y
  • 6222-55-1100 — Oil Pump Ass'Y
  • 6221-51-1100 — Oil Pump Ass'Y
  • 6741-51-1110 — Oil Pump Ass'Y

Fuel & Injection Pumps

Below are example fuel & injection pumps references associated with the Komatsu WA400 family. Some may be stocked products and others may be quote-based references depending on current catalog coverage.

  • 6138-72-1110 — Injection Pump Ass'Y
  • 6138-72-1111 — Injection Pump Ass'Y
  • 6138-72-1130 — Injection Pump Ass'Y,(Tunnel Spec.)
  • 6138-72-1131 — Injection Pump Ass'Y,(Tunnel Spec.)
  • DK101060-2700 — Pump Ass'Y

Additional Pump References

These additional pump references can help narrow the search for Komatsu WA400 pump applications.

  • 07950-10450 — Pump
  • 6136-31-1130 — Gear,Pump Drive
  • 711-49-11120 — Pump
  • 711-49-41120 — Pump
  • 421-06-32570 — Switch,Switch Pump, Cut-Off

Identification Notes

For Komatsu WA400 machines, pump selection should be confirmed using the machine model, serial number, and the parts-book diagram for the specific system application. Do not rely on model alone where serial-range changes or alternate pump arrangements may apply.

Where to Go Next

Need Help Confirming a Pump?

If you are researching a Komatsu WA400 pump and are not fully sure which part applies, gather the machine model, serial number, and any visible pump number before reaching out. That information can be used to guide you toward the correct pump and quote options.

For final confirmation, always verify against your Komatsu parts book for the exact machine serial number.