Massey 65 Power Steering Adjust

fixt · Aug 18, 2018

My Massey 65 Diesel with power steering assist turns harder to the left than to the right. It's not a lot but it is enough to be noticeable.

The service manual for power steering adjust does not not have any detail for the adjustment.
It just says: (p. 41)
7. Continue adjusting the control valve linkage (No. 2 Fig. 2) until the wheel can be turned with the same amount of effort, in both directions and the relief valve can be forced to operate at each extreme position. Tighten lock nut...

My questions:
Does turning the control valve linkage out (longer) affect the left hand turn making it easier?
OR does turning it in put more oil to the steering cylinder making it easier?
Maybe a couple turns and try it?
I ask this based on the oil flow diagram Fig. 1 on p. 32 of the Massey Ferguson Service Manual.

Thanks once again.

Dieseltech · Aug 18, 2018

First make sure the spool valve link ends and pins are tight, if not the power assist side will be hard to adjust. You have mechanical power assist steering, setting the spool center is very touchy to get the same steering help both directions. Just 1/6 of a turn on a good tight spool linkage may be all it takes.

fixt · Aug 18, 2018

Thanks again Dieseltech.
Looking more closely at the oil flow drawing, I think moving the valve center out, away from the valve body will affect the left turn.
This should open up the left turn port more.
My spool valve linkage is good and tight.
I had no idea it would so little adjustment to correct it.

hymie2lt · Aug 18, 2018

You may have tried this already....Grease the spindle excessively. I had a Massey 90 that the one spindle was locked up tight. The steering would turn it but hard and
only the one way. I actually had to remove the spindle and get the grease flowing up and down from the grease zerk. Fixed the trouble right up.
Wayne

DavidP, South Wales · Aug 19, 2018

Hi,
would add a little to Dieseltech's comments. You will probbly have a slightly different system to those fitted in the UK but as far as I know they both work in exactly the same way. They must have a controlled amount of play in order to activate the hydraulic power. A small amount of movement on the steering wheel should move the spool valve and give you power to turn. Have an assistant rock the steering wheel back and forth slowly. Check the amount of movement both ways on the spool valve. If you have better steering to one side then the spool movement will be greater one way. Check back along the system to see if you are losing movement by wear in a component. If you find wear this should be eliminated by replacement, machining or a bit of good 'ol fashioned ingenuity. The less wear in the whole system the better your steering will be.

DavidP, South Wales

fixt · Aug 22, 2018

I completed the steering adjustment today very satisfactorily.
I turned the control valve linkage adjustment out 1/4 turn which made the turning power required the same. It is in fact the "out" direction for the left turn.

I thought it should be easier to turn so I also turned the adjusting pin out 1/2 turn to admit more oil " pre turn", I guess you might call it. That would put the adjusting pin at about 7 1/2 to 8 turns out; the book calls for 7 which is what I set it at when I had the front pedestal apart previously.

It turns quite easily and requires the same amount of force to turn it both ways. I'm happy with the results. It turned out not a big deal at all.

Thanks to everyone once again.

Massey 65 Power Steering Adjust

fixt

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Dieseltech

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fixt

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hymie2lt

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DavidP, South Wales

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fixt

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