it could be one of two items.firstly the oil in the lift ram could be bypassing the seals allowing the ram to drop you can test this removing a hose and see if any oil starts coming out of the pipe on the ram you should see a little bit but not a lot , secondly you may have a problem with a arv(large round sort of shape items on top and bottom of the spool block) on the back valve chest move your levers forwards and backwards but not with the machine running and careful as the back actor will still drop when the lever is moved, see which valves match ,then swop over a valve which has the same psi /bar reading see if this transfers the fault to another service if it does than you know a arv is faulty
bally, February 2009
