Ford power steering

mikep · Oct 12, 2018

Hi
My old Sanderson has an annoying steering problem and I wonder if anyone can give me some advice
It generally steers fine but occasionally it just refuses to steer any more than a bit, getting any lock on is difficult to say the least. Hardly noticeable when traveling but when actually moving stuff can be a pain. It even proves difficult with a good load up front.
I've resealed the pump and changed the filter (what twit designed that set up?) Fluid stays put no froth so not cavitating.
Any suggestions welcome.
Thanks

Kevtherev · Oct 12, 2018

Steering orbital unit worth checking

essexpete · Oct 12, 2018

Which model? ACE might be able to help.

Mr Happy · Oct 12, 2018

mikep said:
Hi
My old Sanderson has an annoying steering problem and I wonder if anyone can give me some advice
It generally steers fine but occasionally it just refuses to steer any more than a bit, getting any lock on is difficult to say the least. Hardly noticeable when traveling but when actually moving stuff can be a pain. It even proves difficult with a good load up front.
I've resealed the pump and changed the filter (what twit designed that set up?) Fluid stays put no froth so not cavitating.
Any suggestions welcome.
Thanks

What type of had pump did you reveal @ mikep as I could have a priority valve fitted to it.

mikep · Oct 13, 2018

Mr Happy said:
What type of had pump did you reveal @ mikep as I could have a priority valve fitted to it.

It's the Ford tractor pump as in 5000 so dedicated steering. May be worth having a look at the orbitrol unit @Kevtherev but I thought they were either or?

Flat 10 · Oct 15, 2018

Find priority valve. Pull it it out and clean it, may be polish it with something suitably gentle. Likely a bit of fluff from ram seals blocking it. Our 725 used to do it all the time....

mikep · Oct 17, 2018

Flat 10 said:
Find priority valve. Pull it it out and clean it, may be polish it with something suitably gentle. Likely a bit of fluff from ram seals blocking it. Our 725 used to do it all the time....

No priority valve as it uses the tractor pump.

Mr Happy · Oct 17, 2018

mikep said:
No priority valve as it uses the tractor pump.

Are we sure as the info I have shows a steering pump for the Ford 5000 to have its own tank and priority valve in the front cover. If we can get some pictures we can hopefully confirm what pump is actually fitted.

mikep · Oct 17, 2018

It's the all in one pump/reservoir. Can't think it would have a PV as it only feeds one circuit.

Mursal · Oct 17, 2018

Stick an oil pressure gauge on a tee piece on the output from the pump and see what you have when good and when bad?
Also worth checking the kingpin bushes and bearings, one might be going to seize.

Edit:
The tight bush will just make the relief valve in the pump open .......

mikep · Oct 17, 2018

Mursal said:
Stick an oil pressure gauge on a tee piece on the output from the pump and see what you have when good and when bad?
Also worth checking the kingpin bushes and bearings, one might be going to seize.

Edit:
The tight bush will just make the relief valve in the pump open .......

A tight bush makes my 'relief valve' open and pump as well

Will try that but it could actually be the prv as when it is playing up you can only get a small turn either way then nothing no matter how hard you rev it's solid.

Mr Happy · Oct 18, 2018

Is this the pump on the Sanderson?

mikep · Oct 19, 2018

Mr Happy said:
Is this the pump on the Sanderson?

Looks the same. Does it have a prv built in?

Mr Happy · Oct 25, 2018

mikep said:
Looks the same. Does it have a prv built in?

Yes and a priority flow control valve.

mikep · Oct 25, 2018

Mr Happy said:
Yes and a priority flow control valve.

Why would it have a priority valve as it only serves one circuit seems very strange unless it's for another application.
Priority flows are for when two or more circuits are served by the same pump. They make sure that one circuit gets all the flow up to a set point so for example when it is a steering circuit it doesn't loose power on tick over. As everything on the Sanderson goes to the steering then there is no.point.

Mr Happy · Oct 25, 2018

mikep said:
Why would it have a priority valve as it only serves one circuit seems very strange unless it's for another application.
Priority flows are for when two or more circuits are served by the same pump. They make sure that one circuit gets all the flow up to a set point so for example when it is a steering circuit it doesn't loose power on tick over. As everything on the Sanderson goes to the steering then there is no.point.

The regulated port in a priority valve gives a fixed flow to a particular circuit. So the steering unit gets a fixed flow irrespective of engine rpm. In some instances the bypass flow can be used to supply flow to another component or dumped to tank. It just depends on the type of valve.

mikep · Oct 25, 2018

Mr Happy said:
The regulated port in a priority valve gives a fixed flow to a particular circuit. So the steering unit gets a fixed flow irrespective of engine rpm. In some instances the bypass flow can be used to supply flow to another component or dumped to tank. It just depends on the type of valve.

Whilst trying to find details on these it seems some don't have valves at all. The 6610 pump is offered with or without according to build date. Can you send me a high definition copy of that diagram to see where the valves should be.

Mr Happy · Oct 25, 2018

mikep said:
Whilst trying to find details on these it seems some don't have valves at all. The 6610 pump is offered with or without according to build date. Can you send me a high definition copy of that diagram to see where the valves should be.

Can't promise anything better than what I've already got but will see what extra I can find out.

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