Posted by BobW on March 12, 2012 at 10:27:36 from (50.96.108.31):
In Reply to: Ford 600 hydraulics posted by BobW on February 29, 2012 at 10:32:52:
I put a kit in the pump since we had the parts on hand, blew out the pressure and return lines to make sure there were no obstructions, blew air through the cover to confirm the lift piston moved, put everything back together, confirmed pump operation and oil flow at the pump bleeder plug and prepared to celebrate. It was short lived as we still have zero movement of the lift arms.
The O ring I referred is between the lift cover and the chassis where the hydraulic oil enters and returns from the lift cover. I have rummaged through 2 lift cover gasket kits and neither has anything that appears to fit properly. I found the right OD, but too thin to extend above the recess and create a seal (which is why they used 2 on the last repair). There were a couple that are plenty thick, but the OD is larger than the recess so they distort. I found a detailed description at Alma Tractor & Equip and located some hydraulic suitable O rings this exact size. They appear to fit properly and we have oil flow at the accessory port on the lift cover when the accessory lever is "on". So I'm guessing we are sealed well enough that the lift should at least move with no implements attached. What do you think?
So if we have hydraulic pressure to the lift cover, where should I look next? I see we have a pressure relief valve in the cover and the piston/'valve assembly. Are there any other possibilities? Is it advisable to actually measure the pressure delivered to the lift cover? Where do I plumb the test gauge, into the accessory port?
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