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  1. A

    PC55 unload pressure too high

    Looking for some help for my pc55. Just changed the pump and control valve due due to some issues. Things seemed to be fine until I put a pressure gauge on the P1 output and the unload pressure is reading around 900 psi which about 450 psi higher than it should be. What should I be looking at as...
  2. A

    Need Help with Komatsu PC55 **Possible Hydraulic Issue**

    I have a Komatsu PC55-MR3 that I purchased from China and got it shipped here in Calgary, Canada. The machine was dropped at a Komatsu dealership and they filled up the machine with fluids and diesel and performed the following work: Filled hydraulic fluid, engine oil & coolant Change the...
    • Amjad.kamal
    • Thread
    • hydraulic komatsu mini excavator pc55mr-3
    • Replies: 22
    • Forum: Excavators
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