Fiat 750 hydraulic pump won't suck oil


New User
The hydraulics on my Fiat 750 Special won't lift properly.

If I fill the hydraulic unit and pump intake pipe (i.e. the pipe from the hydraulic unit sump to the pipe) with oil and start the tractor, the 3-pt hydraulics will lift about 3/4 of the way and then stop. When it stops, the intake pipe is empty. It seems the pump can't suck oil from the hydraulic unit sump - it can only use the oil already in the intake pipe.

I have replaced all seals, O-rings, gaskets and pressure release valves in both the hydraulic unit and the pump. However, this has not solved the problem.

Does anyone know what the problem could be?

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