Old Craftsman Ras
Picked up an old craftsman radial arm saw. Everything on it works except the crank to raise and lower the unit. It looks like it is just frozen by rust. I have sprayed penetrating oil all over the thing trying to free it up.
Any easy fix other than complete disassembly to free it up?
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A picture would hep.
I would try spraying about half a can of WD-40 every few days into the post around the column that raises the arm.
Also remove the Allen screw that keeps the arm perpendicular to the fence. You could try filling the screw hole with WD-40.
You don't say if the crank turns vs. the shaft being stuck. The Allen screw is usually tightened to where the shaft won't move up and down and then backed off to allow the shaft to move.
When you get it working, for goodness sake, be careful.
The crank drives a gear ....
The lifting gear is inside the column at the bottom. Sometimes the grease in the gear box gets dried up and prevent the gears from turning. You must disassemble it and clean it out or possibly flood it with enough oil to loosen it up. Additionally, at the top of the casting there's a wedge that locks the column at 90 degrees. Put some penetrating oil in at the top of the column as well and loosen the wedge with the set screw that holds it. It may be seized up.
There is a You Tube that shows how to disassemble this saw:
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