Power steering MF 50 farm tractor

tldnc · Sep 3, 2018

I have a MF 50 diesel farm tractor with power steering that works as it should when you first crank the tractor and the system is cold. When the tractor has been run long enough for everything to get hot the power steering does not work well. Using MF power steering fluid. What could cause this problem?

Thanks in advance for all your helpful advice.

Brendon Warren · Sep 3, 2018

Plugged filter?

Steve@Advance · Sep 3, 2018

You'll need to do some diagnostics to isolate the problem.

A shop manual will walk you through the process, you'll need a gauge and some miscellaneous fittings.

Likely it will be either the pump loosing pressure, or the internal seals bypassing in the cylinder.

A simple test, if you want to risk it, with the system up to temperature, turn the wheel and listen for the pump to load. It should slow the engine, make the hose jump when the steering is against the end of it's travel.

To test the pump, engine at idle, with a rag around the pressure hose, crimp the hose shut with Vice Grips. (I know, not good for the hose, so proceed with caution at your discretion). Be sure you are on the pressure hose! Listen for the pump to load. If it loads harder, may even near kill the engine, the pump is good and the cylinder seals are bypassing.

If it loads the same, makes little difference, the pump is not making pressure. Could be the relief valve or worn pump.

Still better to follow the proper procedure though. Kids don't try this at home!

marloweg · Sep 3, 2018

pump is getting wore and when p.s. fluid gets hot it thins out and bypass the gears in the pump end plates all get wore

Power steering MF 50 farm tractor

tldnc

Member

Brendon Warren

Well-known Member

Steve@Advance

Well-known Member

marloweg

Well-known Member

Similar threads