92U 3406
Senior Member
The thing with standard hydraulic cylinders is if the piston seals are gone, they will only drift out, not in.
Depends on the rest of the system and the load imposed. When they go into displacement mode, with only the area of the rod to hold the load, pressures can shoot up increasing the typically minor leakage in the valves, or in some cases opening the port reliefs.The thing with standard hydraulic cylinders is if the piston seals are gone, they will only drift out, not in.
Depends on the rest of the system and the load imposed. When they go into displacement mode, with only the area of the rod to hold the load, pressures can shoot up increasing the typically minor leakage in the valves, or in some cases opening the port reliefs.
This would work if the lift cylinders dropped without any weight on the bucket, and it seems its only dropping with a load. but yes it would work, I know cause I did this with a backhoe, but the lift cylinders where dropping without a load, turns out when capped the boom did not drop. spent more time troubleshooting and turns out the spool in the lift valve was damaged with a big deep scratch.If you still think its in the cylinders, (bypassing internally) raise your boom up safely hold the boom up in the air. Release your hydraulic pressure from the machine( key on no start...rotate and move joysticks) to release pressure. Remove your lift cylinders hyd hoses ( both) and cap both of them off with metal caps. Take a permanent marker and mark your rod. Then releases the boom from whatever you where holding it up with. Watch to see if the boom drops down. If it does its in your cylinders...if not you know its bypassing some where else. Possible control valve spool...etc. good luck... let us know what you find.