Bobcat 763 Aux effects lift/tilt

[hemlcok]

I have a Bobcat 763 C series standard flow.

When I use the aux function while lifting the arms it cause the arms to raise quickly. If I use aux while putting the arms down, it stops the arms from going down. Similar experience with tilt but in reverse

When I let off the aux function then lift/tilt function as normal. This can't be normal is it?

I've tried it both with an attachment and without an attachment connected. I did notice when using aux with my tree grapple there is a notable hissing noise in 1 direction. But that hissing noise isn't there when I use the aux functions and nothing connected.

It seems as if the aux is backfeeding into the lift and tilt?

EDIT: I tried with just a loop of hose on the aux and everything works fine.

 

[Dave the Ozzie]

I have a Bobcat 763 C series standard flow.

When I use the aux function while lifting the arms it cause the arms to raise quickly. If I use aux while putting the arms down, it stops the arms from going down. Similar experience with tilt but in reverse

When I let off the aux function then lift/tilt function as normal. This can't be normal is it?

I've tried it both with an attachment and without an attachment connected. I did notice when using aux with my tree grapple there is a notable hissing noise in 1 direction. But that hissing noise isn't there when I use the aux functions and nothing connected.

It seems as if the aux is backfeeding into the lift and tilt?

EDIT: I tried with just a loop of hose on the aux and everything works fine.

Weird, sounds like something is plumbed incorrectly as the only place these 2 circuits come anywhere close to each other is at the spool valve as the lift/tilt functions are physically connected to the spool valve (assuming you have foot controls) and the auxiliary circuit is electrically operated through a solenoid on the spool valve. Could be a check valve on the spool valve as I think the auxiliary gets priority as it's the first spool to receive oil from the pump.