I have a 2006 Komatsu pc120-6 that is having issues with hydraulic pressure after about an hour of running once the fluid gets to temperature it slows all functions down. I’ve redone both main lift cylinders and just had pump redone filters changed with no changes still the same issue, I’ve had 3 mechanics/parts changers waste my time and money I’ve been reading other post like mine but they have different machine same problem saying it was main pressure relief valve . I’m trying to find the correct parts book for my machine. 2006 pc120-6 serial number 65309 any help would be very appreciated
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