1980 720 lift6 cylinder test

[waynemags]

my 720 was being used when i was away at work by my contractor. before i left i had no issues with the lift arms falling. now im home and i went to move some stuff around the yard. when the arms are lifted as soon as u let off the pedal, the arms start to drift down. i noticed that theres like a dead spot when u depress the peadal to lift it drops then once past that spot it lifts. but when its in the air and you take your foot off it starts dropping bslowly. if you then move the pedal u can stop the dropping. is this an adjustment issue in the pedals or something more. seals in the cylinders arent leaking at all on the outside. not sure where to start.

 

[OldMachinist]

Sounds like a centering spring in control valve is broken.

 

[biggie]

I would start with the lift cylinders.With the lift arms lowwered. Pick a side. Remove the bottom hose" base end" Start the machine and try to LOWWER the arms. If you get alot of flow out of the open port,the piston seals are most likely done. If this doesn't work, try the other side.

 

[waynemags]

I would start with the lift cylinders.With the lift arms lowwered. Pick a side. Remove the bottom hose" base end" Start the machine and try to LOWWER the arms. If you get alot of flow out of the open port,the piston seals are most likely done. If this doesn't work, try the other side.

ok. i took off tyhe hose closest to the engine and plugged the hose. fired it up and tilted the lift pedal forward to drop the arms. fluid came out of opening. the manual says to do this as well but to tilt the tilt pedal to check the lift cylinders. im confused now. oh ya there was oil coming out when i tilted the lift pedal by the wAY