flipmoore82
Automotive
- Nov 16, 2024
- 2
hello, i am in need of assistance. my brother purchased a komatsu pc45r-8 with blown motor, that i have fixed, but hydraulics are weak. at idle no load and cold, ls pressure is 500psi and pump pressure is 1000, when warm ls pressure 1000psi and pump pressure is 1500. when controls are operated both increase, ls pressure little faster then pump pressure, up to ls pressure of 2200psi and pump pressure of 2500. manual states with all levers at hold should have 0 ls pressure and 500-700 psi pump pressure. max pump pressure at relief is supposed to be 3500 psi. if adjust ls pressure any higher then it goes into constant loading but does have more power. when operate two funstions at once it does gain psi. when operate all but swing levers ls and pump pressure drops for a split second before rising. the two travel levers when operated have the most significant drop. when barely move either one i can get the pump and ls pressure to drop about 3-500 psi, but its a very small movement window before presure risies and tracks start moving. i have been through the pump and valve block and have not found anything obvious. though some spools and pressure reducing valves have polished sealing surfaces showing slight wear, nothing that measures out of spec from rest of the body. any help is appreciated and if i am missing needed info please let me know and i will do my best, thank you
