JCB 214, left outrigger cylinder will drift down when machine is stopped. New seals installed in cylinder, no obvious scarring of barrel or piston, and new hold valve. Drifts at a rate of 1 inch every 15-20 minutes and will be on the ground overnight. Noticed cylinder will also drift under a load holding the backhoe up at about the same rate. Removed hose connections at control valve side of hold valve while the outrigger was up in stowed position eliminating a control valve connection to the circuit, same drift at the same rate. Switched hold valves with the other side that works fine to eliminate the possibility of the new hold valve leaking internally, same drift at the same rate. Pretty much tells me there is still some type of leakage in the cylinder between the barrel and rod end of the piston.....somehow. What say you geniuses here? :Banghead