7710 II power steering problem

cjrpr · Apr 19, 2016

I don't work on fords too much. we have one here that is a 7710 II fwa. its steers hard both ways. I checked the steering pressure at both hoses one at a time at the steering cylinder with a gauge and got 1700 psi when turning the steering wheel. does not change much by increasing rpms. I don't have a shop book on this. can somebody tell me what it should have for pressure? if the pressure is ok what else could be going on? thanks for any help.

Sean in PA · Apr 19, 2016

I am not familiar with the steering setup on that model, but according to the parts site, the relief valve for that pump should be set to open at 1600 psi, so 1700 psi is a little high and I wouldn't suspect insufficient pressure as being the cause of the problem.

It looks like that model has fully hydraulic steering. Is it actually hard to turn the steering wheel or does it just take a lot of turning of the steering wheel to get the front wheels to turn? If it's hard to turn the steering wheel itself I would suspect that the steering motor at the base of the steering column needs to be rebuilt. If the steering wheel turns easily but it take a lot of turning to get the front wheels to turn then i would suspect the steering cylinder is leaking a little internally.

sunbeam · Apr 19, 2016

IT manual calls for 1550-1650 lbs and 3.6 gal per min. @ 1000 rpm. It might be flow have you checked the filter?

David G · Apr 19, 2016

My 6610 has loader and 11" wide tires on it, steers hard, but workable.

RodinNS · Apr 19, 2016

I thought the OEM book said it should have 2100 psi at 3.6 gpm but I don't have that in front of me.... I would not trust an I&T book to have the correct figure. There are so many different pressures on Ford steering systems it can get confusing.
That said... the 7710 was never exactly light to steer. If you're used to a Manheim Deere, the Ford will be noticeably heavier on the wheel. However, if it is very difficult to steer... kind of like manual steering... or it binds up, then you have a problem. If it has a ZF axle I'd jack it up and look at the king pin bearings. They do fail... and when they fail, they bind... and they bind a lot more under load than they do jacked in the air.
Unless the steering is wandering I would not go looking at the steering cylinder or the torque generator. In this case I'm a bit suspicious of the pump but probably more suspicious of the king pin bearings.

Rod

billyar · Apr 20, 2016

I bet Rod is right I'd ck king pins. A customer put new pump on 9000 it would not steer you could not turn the spindles with a 8ft pipe jacked up.

7710 II power steering problem

cjrpr

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Sean in PA

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sunbeam

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David G

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RodinNS

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billyar

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