Need Hyd help on my 863G

Have a 863-g. Had a bobcat tech rebuilt The control valve. Put it back on,90% sure I put the pipes and hoses back where they went. Started it up,bucket lifted and tilted like it should,but external hyd wouldn't work. Worked with it a while,external hyd started working. Quit again, and then all of a sudden, the external hyd locked in and no way to release. Without even putting down my safty bar,as soon as it cranks,pressures up. Need help.

Initially after you installed control valve loader functions worked as they should. This seems to tell me that all of your hoses/pipes are installed correctly except possibly one, if the control valve is pilot operated.

Amost sounds as if the control spool for aux is stuck. Is this control valve pilot oil operated or does it have a mechanical linkage to control the spools?

I would be fairly sure this unit has a fixed displacement hyd pump therefore the control valve would be open center. If the aux circuit is the first circuit that receives oil in the control valve it would make sense that the other circuits will not recieve oil and will not function if the aux is stuck in its function.

When you start it now does it sound like the engine is lugging down and the pump is producing full flow? If it is then I would be fairly sure aux spool is stuck. If the aux spool is operated/controlled by pilot pressure make sure all your pilot lines on control valve are in the correct location.

Hope this helps.

Aux are definately engaged. Could be sticking spool or sticking stem. Do you have any attachments- auger or broom would do. Hook attach to machine and note which direction it spins. Then remove and swap aux stems- front to back- and restart. If attachment rotates in opposite direction you have a sticking stem. If same direction problem is in valve. If you don't have an attachment hoses in a 5 gal bucket will do. This is assuming you don't have a short of some sort. To check wiring disconnect plugs on aux coils, when problem occurs, and see what happens.

At this point,every time I crank my machine up it sprays fliud from the lower aux hyd pipe. Need some way to relieve pressure. Don't have a book,so things are strange to me. Do have a book ordered.

Have a grapple hooked to it now. wasn't leaking until I removed the hoses. Cranked it up,think it blew a 0ring, Now it blows fluid even with the hoses hooked back up.

Aux should be either opening or closing the grapple when you start it with attachment on. Swap the stems/coils and see if grapple goes in opposite direction.

I unplugged the electric,tapped on the solinoids,and changed the ahc fuse. Everything works fine now. Thanks for the help. Must have been stuck.

Hi
I'm new here and most impressed with the knowledge of many participants... very interesting.
Quick question.
Why do some skid steer attachment motors have a third hydraulic line, reffered to as a bleeder line and why do only a few skid steers have a third port. I bought a broom and it has a third line but my Case XT90 doesn't... how should I handle this.
Thanks

Hello,

The 3rd line in a motor is used to send internal leakage back to tank. It is usually referred to as a "case drain" line. Typically piston type motors will have this 3rd line compared to a gear type motor.

If your broom has a piston type motor with a 3rd line then oil in this line must be returned to tank. Also, case drains lines will sometimes have a return filter that the oil goes through before it is allowwed to return to tank. If you do not have a 3rd line for case drain return, you will need to install one. Check with the broom manufacturer for reccommendations.

Hope this helps,

Z

Hi Z2898

Thanks for your explanation... mostly helpful.

MacGyver