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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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