Ford 9N Hydraulic Lift Problems. I did notice that the cup the lift arm fits in has a hole in the bottom. Most failures to lift on those hydraulic systems are due to a leaking lift cylinder, a leaking supply tube from the pump to the cylinder, stuck open relief valve, a leaking pump side plate, or possibly the control valve not moving forward completely due to sticking conditions.
Please use the navigational links on your left to explore our website. I recently rebuilt the entire hydraulic lift assembly on my 1941 9n tractor (including lift cover, pump, valves, piston, all seals, new fluid, the who. The unloading valve has an o ring that can become worn until it will not allow the valve to move.