I have a kobelco SK 300 LC Mark 4 having a problem with the boom driftin the the drift lock seems to be working properly. The problem seems to be in the Boom conflux there's a pilot line that comes off the Boom conflux and hydraulic fluid is bypassing through that line took the spools apart and clean them even had a service tech from the local kobelco dealer and still didn't get anywhere with it it would be greatly appreciated if somebody can help me thanks Nick
Did the technician test the cylinders and what is the leakage rate?
I brought up the boom held it with a nothre mechine then lower the other mechine and blocked of the line and its not bypassing in the cylinders