763 Lift Arms wont raise

[drolds]

I dont know where to start. Machine moves fine, but arms wont move and bucket moves real slow. have code hp-1 Thanks for any help.

 

[OldMachinist]

The first thing I'd check is the pump drive belt tension.

 

[Fishfiles]

The first thing I'd check is the pump drive belt tension.

if it moves fine then it is not the belt , the belt drive the sunstrand which makes it travel and the gear pump which makes it lift , tilt and aux , though it could be possible be a relief valve stuck , that is pretty rare , blwon piston seals on three cylinders at the same time would be hard to believe , the pump being bad is very common ----------- if you were to put the bucket of the machine up against something like a pile of mud or a piece of equipment and push against it at full throttle you should be able to spin the tires without any belt squell or chatter and that would eliminate the belt , a pressure gauge and a quick couple will show you the pressure thru the aux quick coupler on front the machine ----- I think your gear pump is bad

 

[OldMachinist]

if it moves fine then it is not the belt , the belt drive the sunstrand which makes it travel and the gear pump which makes it lift , tilt and aux , though it could be possible be a relief valve stuck , that is pretty rare , blwon piston seals on three cylinders at the same time would be hard to believe , the pump being bad is very common ----------- if you were to put the bucket of the machine up against something like a pile of mud or a piece of equipment and push against it at full throttle you should be able to spin the tires without any belt squell or chatter and that would eliminate the belt , a pressure gauge and a quick couple will show you the pressure thru the aux quick coupler on front the machine ----- I think your gear pump is bad

It shouldn't drive very far the HP-1 code is a Hydrostatic low pressure shut down code.