743 lift arm drift

[Sparky87]

Hey all, question, I have a very slow drift down on my lift arms of my 743. I've replaced the lift cylinder seals and just today replaced the spool valve seals, only to be let down. It still drifts down. Am I looking next for a cracked hose?

 

[fortworth-cowboy]

Did you checked the piston seals and the nylon rings? If they spin they will bypass which results in a drift.

 

[Sparky87]

Did you checked the piston seals and the nylon rings? If they spin they will bypass which results in a drift.

I changed the seals in both lift cylinders previously, unless I messed up?

 

[fortworth-cowboy]

I changed the seals in both lift cylinders previously, unless I messed up?

Did the pistons had green nylon rings???

 

[Sparky87]

Did the pistons had green nylon rings???

I don't remember what color they were

 

[Markle]

Some drift down is acceptable, like an inch per hour.
Sticking load check valves or off center spool valve position could cause it too. Usually it’s the lift cylinder seals or in my case I had a cracked lift cylinder piston.