back actor?

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

oil leaking past rod seals in ram
ARV leaing in excavator valve block (could have a bust o ring seal)

jamie
January 2009

hi sean ring digger doctor he will sort you out with the spares and imformation saved me 100s of pounds with my machine tel 01455612307
thanks

paul
January 2009

Worn ram seals or control valve seals.
Control valve seals are the easiest to replace.
I'd do this first, if the drop is excessive.
I'm assuming you have no fluid leaks!

Mr. Toad
January 2009