We have a Komatsu 220 LC-8, with supposedly 3000 hours. The main hydraulic valve has developed a moderate to severe hyd fluid leak on the back part of the valve where the In and Out from the main pump oil comes into the circuit valve stack. Under hard steady digging it has built up to a 5 gal leak in 8 hours. Could the pump pressures or reliefs be off?
Komatsu 220 LC-8 excavator
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