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Minneapolis Moline Tractors Discussion Forum
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4 star power steering pump

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d masters

02-21-2006 10:28:45




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anybody out there rebuild power steering pumps for a 4 star MM?




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JRMoline

02-26-2006 16:36:04




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 Re: 4 star power steering pump in reply to d masters, 02-21-2006 10:28:45  
I've read with interest your discussion on the 4 Star steering problems. Is the 4 Star system similar to the 445? It sounds like it. I'm looking for advice on my 445. It stopped powering the steering yesterday when I was plowing snow. It was cold (maybe 10F) but not that cold. It has always worked in conditions much worse.

I turned hard right into unplowed and when I backed up, no power to the steering. I finished up but it was a job.

I topped off the hydraulic fluid (didn't really need it) but no change. Both the bucket and backblade seem to be lifting normally. Warmed it up and tried it again today to see if there might be a change due to temp (ie. air or ice in a line). It was in the 20's but no change.

No leakage is showing around the steering shaft or lines leading into the valve body (or whatevery you call the unit that powers the steering shaft up by the radiator).

Any advice would be appreciated.

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ROWDY33

02-22-2006 18:41:07




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 Re: 4 star power steering pump in reply to d masters, 02-21-2006 10:28:45  
SWMolines?

You state;
"The pressure regulator adustment screw is a set-screw with a locking nut on it. Turning it inward increase the system pressure."

Is that screw and lock nut verticle or horontzal with the tractor? I'm looking for it in a repair catalog.

Also look for damaged hydraulic lines or tubes.

The repair catalog states that the system is called a "valve control".

You might get luckey and simply take apart the control valve, clean it up with parts cleaner and replace with new seals.

In my case I need the whole complete valve control because I bought the tractor without one that came with.

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SWMolines

02-23-2006 06:19:02




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 Re: 4 star power steering pump in reply to ROWDY33, 02-22-2006 18:41:07  
It is a horizontal set-screw. I believe on the left-hand side of the openning about 1" to 1-1/2" below the top surface and it threads in towards the front of the tractor. Keep in mind the beginning of the last sentence began with, "I believe.....". I am pretty certain about the the location and it is definitly horizontal.


Good Luck!



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d masters

02-22-2006 03:54:54




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 Re: 4 star power steering pump in reply to d masters, 02-21-2006 10:28:45  
rowdy33 you are right on the part i need,lower lf front of motor,by radiator



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SWMolines

02-22-2006 09:18:07




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 Re: 4 star power steering pump in reply to d masters, 02-22-2006 03:54:54  
That valve body is a fairly easy item to rebuild. The only thing that you should need to replace is o-rings. Hoever, you have not posted the details of what problem you are having. If this unit is not leaking and the power steering is not functioning, you could have a faulty hydralic pump (located above the PTO) or the activator lever in the valve assembly could be worn. If you have fluid leaking out around the steering shaft, that is a sign that the piston seals on the power steering rack need to be replaced.

Post more details on that the tractor is or is not doing and I certain people who visit this site can give a more detailed advice on that to do to repair it. If you do not have a parts manual, call Jansales at 800-443-0625 or go to www.janesales.com, they can get you one.


Good Luck!

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d masters

02-22-2006 10:09:42




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 Re: 4 star power steering pump in reply to SWMolines, 02-22-2006 09:18:07  
the shaft going into the sector is loose,do not notice any leaks,three point lifts fine,auxillary hoses work fine but is darn hard steering,am i any closer to explianing this?i am puzzelled.



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SWMolines

02-22-2006 14:06:46




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 Re: 4 star power steering pump in reply to d masters, 02-22-2006 10:09:42  
That does narrow it down some. It seems to indicate that the system is most likely not getting the pressurized oil to make the power steering work. Meaning, the activation lever I mentioned earlier may be worn, the priority valve on the hydrualic pump is not allowing oil to the power steering or (here is where I do not have any knowledge) the pressure regualtor for the power steering system is not maintaning high enough oil pressure.

Try this little experiment:

Assuming the system has proper fluid level put a load on the 3 pt arms, start lifting the load. As the arms are coming up, turn the steering wheel and see if the 3 pt arms slow down or possibly stop. If they do, then the activation lever is doing its job. Try turning the wheel in both directions. It should give the same result. If the system suggles to lift the load when you are not moving the steering wheel, the hydrualic system pressure might need to be adjusted. That can be done by removing the small cover under the seat with the 2 levers mounted on it. The pressure regulator adustment screw is a set-screw with a locking nut on it. Turning it inward increase the system pressure.


Good Luck! Post back if you have more questions and we'll try to help you.

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Kevin Moschenrose

02-22-2006 22:30:15




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 Re: 4 star power steering pump in reply to SWMolines, 02-22-2006 14:06:46  
Hey SWmolines that is what I was getting at when I made the other post when I mentioned the control valve. I ran into the same problem with my jetstar and it turned out not only was the pressure regulator out of adjustment but had two bad o-rings in it as well.



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d masters

02-22-2006 15:45:22




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 Re: 4 star power steering pump in reply to SWMolines, 02-22-2006 14:06:46  
thank you,it makes sense,will give it a try,but still may have to pick your brain,i am a little slow on these things



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Kevin Moschenrose

02-22-2006 06:56:19




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 Re: 4 star power steering pump in reply to d masters, 02-22-2006 03:54:54  
That is NOT a power steering pump. The housing contains a steering sector piston and sleeves along with o rings. There is no pump there.



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ILL John

02-21-2006 17:44:39




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 Re: 4 star power steering pump in reply to d masters, 02-21-2006 10:28:45  
Just to clarify, wouldn't that be the main hydraulic pump on the rear of the tractor?



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Kevin Moschenrose

02-21-2006 22:27:58




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 Re: 4 star power steering pump in reply to ILL John, 02-21-2006 17:44:39  
John, You are right! Maybe they mean the control valve or the damper valve but I am a little lost on what they mean as well?



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ROWDY33

02-21-2006 18:08:20




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 Re: 4 star power steering pump in reply to ILL John, 02-21-2006 17:44:39  
I believe he's refering to the system on the sterring shaft twards the front of the tractor that an oil line feed fron the gearbox. I need one myself.



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ROWDY33

02-23-2006 18:45:00




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 Re: 4 star power steering pump in reply to ROWDY33, 02-21-2006 18:08:20  
Thanx. I gotta get the cover off this early spring and was taking notes of things to do and look for while I'm at it.

Something is slipping for the PTO. I hoipe I can fix it by tighting the locking nut.



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