Sometimes the the control fork comes off of the control valve. Need to make sure the valve is moving when you move the quadrant.
If it did come off, they can be a bit tricky to get back on. Need to remove both side covers and using two hands, one from each side, spread the fork and reinstall onto the control valve tee.
Quoting Removed, click Modern View to see
Your control valve could have trash in it from running "filthy fluid". Trash inside the valve can make it stick so it does not move in and out to control the flow of hydraulic fluid to the ram cylinder.
If the valve is stuck, sometimes they will free up with the fluid change you did. Sometimes it can mean dropping the pump for disassembly and cleaning.
Need to determine why the lift isn't working first.
Is the pump turning?
Is the fork off of the valve?
Is the valve stuck / sticking?
Is there major leakage from the ram cylinder above?
If your fork is on and trying to move the control valve, you can try "helping" to free up the control valve by hand, through one of the inspection covers.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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