Hello I recently acquired a new to me ford 4500 TLB with a shuttle shift transmission and the gas engine. Appears to be in pretty decent shape and low hours on the engine. The biggest problem it has is one of the outriggers drifts down while it’s running. It drifts with pressure down I can raise and lower it and it lifts the machine just won’t hold it there. Is it possible that an o ring is bad in the valve body? This is my first machine with a backhoe and front loader.