I am trying to resolve the pressure issue.

I have replace the 12 vanes in the Vickers Vane Pump.
Replace hydraulic oil, remove and clean the suction and pressure tube.
Start the engine and look at the movement in the hydraulic reservoir, lots of Bulbe but no oil coming out of the pressure tube that feeds the lift cover, normally oil should come out a few inches high.

Any idea of what is the problem.

Thank you for your help.

Normand

The pump is 70 years old and worn in multiple areas. Time to consider a new pump.

TOH

If your pump was bad replacing just the vanes won't help. The outer housing that the vanes run on will wear faster than the vanes so it is best to replace the center section of the pump as a unit. Even a good vane pump will not self bleed. You can put air pressure in the hydraulic dipstick tube with the pressure line loose and the tractor running at low speed. When you get oil flow shut the tractor of and tighten the pressure line.

Mark