Excavator Main Hydraulic Pump

Komatsu D31 D37 D39 Dozer Hydraulic Main Pump 708-1T-00552

Hydraulic Main Pump Assembly 708-1T-00552 compatible with Komatsu D31 D37 D39PX-22 D31EX D37EX D39EX dozer.
Strict quality inspection before shipment. High strength material, excellent wear resistance, stable hydraulic output.
Ideal replacement part for repair & overhaul.
Fast delivery and competitive price.

✅ Part No: 708-1T-00552
✅ Fit for Komatsu D31, D37, D39 Crawler Dozer, D31PX-22, D37PX-22, D39PX-22, D31EX, D37EX, D39EX
✅Replacement, matches OEM specification
✅ Pre-tested hydraulic performance, low leakage & stable pressure
✅ Heavy-duty material for harsh construction site
✅ Direct installation, no modification needed
✅ Used for dozer repair, maintenance & fleet overhaul

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Product Details

708-1T-00552 Hydraulic Main Pump Komatsu D31 D37 D39 Dozer

Compatible Equipment

D37EX-22.

The same part number can be quoted for more than one arrangement within a model range, and the same description often covers different parts across a production run. Send your model and full serial number — or the parts-book page reference — and we will confirm the fitment before dispatch.

What This Part Does

A service kit bundles the seals, rings and one-time-use parts for one assembly into a single part number, so the job is done with everything on hand instead of part way. In this machine it sits in the hydraulic system, and it is the number the parts book calls out for that position. When it wears or fails, the symptom usually shows up in the function of the assembly rather than as damage you can see from outside — which is why fitment and serial number matter more than appearance.

When to Replace

  • The assembly is being overhauled or rebuilt.
  • A leak or pressure loss is traced to the assembly and it is being opened anyway.
  • The machine has high hours and the assembly has never been resealed.
  • Contamination or overheating has degraded the seals throughout the assembly.
  • Individual seals are being replaced one at a time and the job keeps coming back.

Installation Notes

  1. Identify the assembly and its serial range before ordering — kits differ between production runs.
  2. Strip and clean everything before starting; you cannot assess wear through a layer of dirt.
  3. Inspect the shaft, bore and mating faces — a kit will not fix a worn hard part.
  4. Replace every item in the kit, including the ones that look serviceable.
  5. Reassemble to the manual torque and clearance values, then test before returning to work.
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