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What I did. With the cab stuck in the up position. Using the manual pump. Switch in up mode, pump until pressure built up. No movement in the cab position. Switch to down mode, pump until pressure built up. No movement in the cab position. Repeat and repeat and repeat until I was red face with...

I have a 1078A1 that the cab got stuck in the up position as well and tried similar things as you have Note: this happened after I rebuilt the pump. If I recall I read somewhere that the cylinder has a lock valve that comes into play when the cylinder is extended or retracted in a quick manner...