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MF 253 Power Steering Pump

W

Walter Buller

Member
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.
 
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.
 
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.
 
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.
 
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.
 
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).
 
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.
 
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.
 
(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.
Click to expand...


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).
 
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.
 
we have 2-253's and they have a relief valve some where in the system because you can here it open, I don't think you can use a gear driven pump without some type of relief without damaging the pump, go online to agco parts book, click on guest user and enter your tractor model,there you will be able to find the correct part numbers and view a parts diagram, the 253's if I remember correct had a couple of different style steering set-ups both of ours have the small cylinders mounted on each side of the front axle, with this style 1500# with sufficient flow would easily steer a 253.
 
Thanks gbs. I'll check them out. My 253 has the two small hydraulic cylinders up front just like yours. Like I said. The new pump worked perfectly for about an hour. So maybe it was just a defective pump.
 
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