773 hydraulic seems to bleed off

[bubba828]

Its a 1998 773. I only notice it when the brushcat attatchment is on. Probably because of its weight. When i tilt the brushcat back it will slowly tilt back forward. Within a minute or so it will have already hit the ground. The lift arms seem to do the same the but at a very slow rate and is hardly noticable. The main problem is the tilt. Not sure if its the cylinder or maybe something in the valve assembly. Any help would be appreciated. Recently just did a full fluids change along with filters. Problem existed before this was done.

 

[Tazza]

Does it do the same when you have the machine turned off and bobtach tilted back?
If its leaking down it could be bad internal ram seals or leaky load checks on the control block. Its normal for them to leak down a few inches per hour, but from what you describe, that is not normal.
Are the plates around your lift and tilt pedals clear? I know my S250 had rust near the pedals forcing a plate out that was binding the pedals making them not return fully to neutral.