power steering pump - relief valve spring replace?

jfharper · May 9, 2012

got a mf 205 industrial and the relief valve in the power steering pump is fully adjusted down and I can't get the pressure i need...anyone know if the springs can be replaced without having to buy a whole new pump?

gbs · May 9, 2012

can you hear the relief valve squeal when steering is turned as far as it can go in either direction and holding it ,if not the pump is probably weak instead of the relief valve,one other thing if your tractor has the steering control valve mounted on the steering cylinder and operated by a control rod to steering shaft the pins and rod ends that operate the valve will wear to the point that the valve doesn't move enough to supply pressure to the cylinder, neither will the relief open if there worn bad enough,you will have armstrong steering only

jfharper · May 10, 2012

(quoted from post at 19:19:51 05/09/12) can you hear the relief valve squeal when steering is turned as far as it can go in either direction and holding it ,if not the pump is probably weak instead of the relief valve,one other thing if your tractor has the steering control valve mounted on the steering cylinder and operated by a control rod to steering shaft the pins and rod ends that operate the valve will wear to the point that the valve doesn't move enough to supply pressure to the cylinder, neither will the relief open if there worn bad enough,you will have armstrong steering only

Not a squeal, but more like slurping...like air and fluid are passing by a small opening.

While I was waiting for a reply to this post last night, I thought I would try a few things:
1. First, attached a gauge and got around 100 psi of the the pressure side and fluid would foam and move out the steering column seal below the steering wheel.
2. I removed the pump and stretched out both springs in the relief valve a bit, put back together and got pressure of 500 psi when turning left or right and holding and no fluid came out the steering column.
3. Took pump off again and noticed it was pretty warm to the touch from number 2 above, then tried to stretch springs more, put back and got 100 psi pressure and fluid out steering column.

When I stretched springs under number 3 above, the springs didn't stretch straight. I put it back together anyway, but I think the crooked springs may be inhibiting the relief valve from closing.

I'll look into your other suggestions...I need to read the manual to understand the stuff you said...I just thought I would post what I did in the meantime.

power steering pump - relief valve spring replace?

jfharper

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gbs

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jfharper

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