2018 bobcat t550 lift response issue

[Jeddy]

2018 bobcat t550 with foot controls(non joystick)
When I am running consistent flow on a bush hog or when holding the thumb on a grapple, the lift and tilt functions on the arms do not work.
Has anyone had issues like this

 

[brdgbldr]

2018 bobcat t550 with foot controls(non joystick)
When I am running consistent flow on a bush hog or when holding the thumb on a grapple, the lift and tilt functions on the arms do not work.
Has anyone had issues like this

Not sure of that specific machine but on older machines if the auxiliary was operating on constant flow the lift, tilt and even the drive would not work normally because all of the fluid was going to the auxiliary and no pressure left for other functions.

With a grapple, if you close the grapple on something and keep putting pressure on it the relief valve will open causing fluid to keep flowing the same as having the auxiliary on constant flow with the same results as above.
If the grapple cylinders are not leaking then you should be able to clamp down on something and then stop putting pressure on it a the grapple should not let go. Try this and see if you get a different result.