I own a 1998 773F with cab&heat hand control have had it for 5 years and only had this one problem and it is intermitten bucket tilt/dump starts moving on its own and can't counter this action puts the bucket fully in dump postion and does not allow lift arms to fully retract causing me to be trapped in machine door could not be opened even after using knob to release the hyd. presure. and I'am a big guy window exit was not in the cards a buddy came by to see me trapped not funny!!! but went and got his backhoe and lifted arm up so I could get out. this machine only has 450 hours on it didn't think I would be having problems like this that why I have a BOBCAT the tilt acturator#6672285 or #7104842 is $480.00 for a small elec. motor/sevo with a tiny timing belt. are there rebuilt ones or looking for a good place for good used parts price for the new one is crazy. I switch lift and tilt acturators and seems to move the problem, this causes hyd. lock-up and will not allways reset by turning off the machine and restarting it for lights showing the problem.