Hi all, newbie here, I own a S70E Boxcar special that I use for moving manufacturing machinery.

My monotrol pedal is giving fits, I have neither forward nor reverse. However this is intermittent, after several clicks back and forth then I usually get transmission engagement back. Today was different where I could not get any engagement and thus could not move.

Wondering if there is some interlock problem, i.e. foot or parking brake sticking that's inhibiting the monotrol action. I've checked and topped off the transmission fluid level.

Another curious symptom is that I have zero steering capability when this is occurring, so again wondering if something like the parking brake is interlocking the main hydraulics?

Another angle on this is that sometimes the lift sits for a month at a time and I do have some leaks....so wondering if I could possibly be air-locked?

Thanks for any suggestions...I guess I understand that something is wrong in the hydraulic control circuit but not sure how to proceed for repairs or testing...would rebuilding the "plate" on top of the transmission where all the monotrol lines plug in be a place to start?

TIA
-Matt