S650 aux valve issues

[cheesecurd]

Gents, have a 2011 S650 std flow unit that has "slow" flow at aux circuit. also seems to not hold say when you squeeze grapple closed—it doesn't hold anything tightly. Any ideas?

 

[walio123]

If bucket and boom movements are fast and powerful, the problem may be in grapple itself. If you are sure the problem is low flow in aux hydraulics-There are several possibilities. Check for leakage in aux lines. The aux hydraulic valve is with pilot pressure, / check for leakage around the thin steel tubing of the valve body /. Alternatively, the solenoids of the hydraulics may release very little pilot pressure.But in this case aux will work slow but will hold pressure. There is also check valve that can stuck in near to close position. There are also some valves with port relief valve it is possible damage or stuck in open position.