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MF 253 Power Steering Pump

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Walter Buller
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PostPosted: Fri Dec 29, 2017 1:46 pm    Post subject: MF 253 Power Steering Pump Reply to specific post Reply with quote

When the PS pump stopped working on my 253, I replaced it with one that was supposed to be correct for the tractor. It replaces part # 773126M92. But
it only worked for about an hour. My mechanic compared it to the old one and said the old one had no pressure relief valve whereas the new one had one
that released at 1500 psi which wasn't enough to turn the tractor. I haven't yet found one like the old one. Any of you guys know anything about this?
I sure would appreciate some input.
 
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Dieseltech
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PostPosted: Fri Dec 29, 2017 1:58 pm    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

I'd check ALL the front end movable parts first, if the spindles turn hard that may be your trouble. Most MF tractors steer fine with less than 1500 PSI. Any chance the pump outlet pressure line has been brazed on to repair a leak? Had that happen on the neighbor's 175 that instead of replacing the line it was brazed. Burned up the power steering pump in short order as the relief valve was blowing all the time because the line was brazed shut. A new pump and pressure line was needed to repair it correctly.
 
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Walter Buller
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PostPosted: Fri Dec 29, 2017 2:22 pm    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

All the spindles are loose and freshly greased. No welding or brazing. It's not a matter of the tractor being difficult to steer. It's a matter of the tractor not steering at all. You can turn the steering wheel with your pinkie finger all day long but the front wheels won't move. We replaced the power steering motor and both hydraulic cylinders up front. No difference. The new pump actually worked for about an hour then once again we could not steer this tractor.
 
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Dieseltech
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PostPosted: Fri Dec 29, 2017 4:26 pm    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

Any chance it needs more oil? The parts list shows three pumps used, and an extra tank fitted to the top of the pump tank. Some power steering systems are tough to air bleed while filling the holding tank. Also noted the parts pumps shown none had a relief valve. I have a 135 that has a slow leak, when it gets low and picks up air it takes awhile after filling and re-filling to get all the air out.
 
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ptfarmer
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PostPosted: Fri Dec 29, 2017 7:37 pm    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

The 253 has hydrostatic steering, are you sure the problem is not in the steering cylinder for the front axle (could have blown a seal out of the piston) which I would look at first. The second thing it could be is the orbital valve (under the dash) has a problem. Your old pump maybe still good.
 
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ptfarmer
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PostPosted: Fri Dec 29, 2017 7:42 pm    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

Dang no edit. I see the new power steering pump worked for awhile. Could be the old pump possibly sent trash through the whole system (wore the seals out in the steering cylinder, or its blocking something in the orbital valve).
 
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Walter Buller
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PostPosted: Sat Dec 30, 2017 7:25 am    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

Actually, the specs on the pump call for the reservoir to be only a third to no more than half full, that any more than this could blow the seals. My mechanic bled all the air several times. There really wasn't any to speak of. The brand new pump had no leaks, and came with a 1500# relief valve. The old pump did not have a relief valve. My mechanic is the best there is around here with over 40 years experience. He agreed that 1500# should be more than adequate for most tractors, but that the 253 is in a class by itself. It needs more than that, which apparently is the reason the original pump had no relief valve. The new pumps part # replaces part # 7731HM92. A lady I spoke with yesterday at a parts company said that the correct part # for that tractor was either 3774614M91, or 773126M92. I would appreciate it if you would tell me the part #s of the three pumps that you found. None of this aggravation would be necessary if MF had left well enough alone and stuck with the original power assist steering that included a mechanical connection to the front axle. Thanks so much for your help.
 
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ptfarmer
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PostPosted: Sat Dec 30, 2017 9:32 am    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

Part numbers:
1695922M91 (Steering Pump SUNDSTRAND)
3774041M91 (Steering Pump SUNDSTRAND)
3774614M91 (Steering Pump ENERFLUX N0.5152)
 
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Walter Buller
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PostPosted: Sat Dec 30, 2017 10:59 am    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

3774041M91 Corresponds with the part # that the lady gave me. So We'll try that one next.Thanks
 
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Walter Buller
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PostPosted: Sat Dec 30, 2017 11:05 am    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

We replaced both steering cylinders. If by the "orbital valve" you mean the square steering motor with connections for 4 hydraulic lines in the
steering column, we replaced that too.
 
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ptfarmer
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PostPosted: Sat Dec 30, 2017 2:53 pm    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

CVPost-Walter Buller wrote:
(quoted from post at 12:05:40 12/30/17) If by the "orbital valve" you mean the square steering motor with connections for 4 hydraulic lines in the
steering column, we replaced that too.



That was what I was talking about, so everything is new (or rebuilt). It's possible for something new, or rebuilt to go bad pretty quick (I gotten some new parts on occasion that were bad right out of the box).
 
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Walter Buller
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PostPosted: Sat Dec 30, 2017 6:34 pm    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

If that is what happened, it would be the pump that was defective. It did work, but only for about an hour. However, my mechanic said he was surprised
it worked even that long because it was the wrong pump for this tractor. The correct pump, apparently being part # 3774614M91, has no internal
pressure relief valve. It takes more than 1500 psi to steer this tractor, according to him. I don't understand that. Seems to me that with the new
pump releasing pressure at 1500 psi, it would at least have tried to steer the tractor, albeit resulting in the steering wheel being kind of stiff or
at least not as easy to turn as it should be. But that's not what happened. The steering was pinkie-finger smooth for about an hour, then suddenly
even easier but with no affect. The front wheels wouldn't budge. Wish I could remember where I bought the new pump.
 
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ptfarmer
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PostPosted: Sat Dec 30, 2017 11:09 pm    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

If you could put a "T" in the pressure line out of the pump so you can put a pressure gauge to see what the pump pressure is.
 
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Walter Buller
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PostPosted: Sun Dec 31, 2017 5:35 am    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

My mechanic did that. Got a reading of between 1200-1500 #.
 
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ptfarmer
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PostPosted: Sun Dec 31, 2017 7:59 am    Post subject: Re: MF 253 Power Steering Pump Reply to specific post Reply with quote

Getting anything to the steering cylinder at all? Only things left are the steering cylinder, or the steering motor.
 
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