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MF 135 ps overheated

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Dieselgg
Join Date: Aug 2012
Posts: 14 Cresson Texas
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2022-03-16          200905


I have a 135 that the pump gets so hot that you cannot touch it within 5 to 10 minutes. I have replaced the pump, hoses & ram with new components. I tried changing how the hoses connect on the ram with same results. Does anyone have any ideas??
Thanks

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MF 135 ps overheated

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greyhorse
Join Date: Jun 2013
Posts: 65
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2022-03-16          200906


Couple things that can cause high heat build are :
Is the fluid contaminated?
Is the fluid the correct type and viscosity?
How is the hydo fluid level, could any filter or screen be clogged?

....

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____________________________________________________________________________________
MF 135 ps overheated

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Dieselgg
Join Date: Aug 2012
Posts: 14 Cresson Texas
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2022-03-16          200910


Hi Grayhorse, thanks for answering. Everything is new, correct fluid and full. I have wrenched on Big Trucks & Cats for 50 yrs but this is really starting to get to me. The only thing else I could think of is when they made the two hydraulic hoses, the could have “pealed” a chunk of rubber in the hose. I will pull the hoses next time out to the farm.
....

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MF 135 ps overheated

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Imfedup
Join Date: Dec 2015
Posts: 52 Central Kentucky
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2022-03-18          200918


I think you're leaving a lot of information out.

ASSUMING you replaced the original pump because it was just old and tired. Except for that the steering was working without other problems? You replaced the pump first, and then the heating issue came up? Nothing else was changed or disturbed up to that point? The new hoses, cylinder, etc all came later (because of the heating problem)? It's just the pump that gets hot or most everything else as well, steel lines, control valve, etc? Does the steering seem to work well enough even though the heating issue is there?

A pump with a higher relief setting isn't going to cause a heating problem. The operating pressure shouldn't be any higher with this pump than with the old one until the steering bottoms out in full right or left turn. A restriction somewhere in the system might, yes. but it will usually be noticeable (temperature wise) in other places as well. If the heating is confined mainly to the pump itself, I'd be inclined to take it up with the supplier. Regardless of where the pump came from (or what it cost) defective parts are not unheard of.

If you suspect one of the new hoses, by all means check them out. If that doesn't show you anything, I'd be looking for a way to tee a pressure gauge in. That might take some engineering on your part. I'm not aware of any test ports on the 135. I don't think I've ever needed one.

I'm curious to see what you find. ....

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MF 135 ps overheated

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Murf
Join Date: Dec 1999
Posts: 7228 Toronto Area, Ontario, Canada
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2022-03-21          200925


When it comes to hydraulics the only real cause of heat is work, the more work, the more heat it creates.

If you have not already done so, I would suggest you take a careful look at the power steering box. It is the only other piece left in the circuit.

Thats a leaking internal seal will not be evident because the fluid is merely circulating back to the return line. However, the friction as it leaks past the seal will work very much like a partly open relief valve and cause excess work and therefore excess heat.

Its a simple easy thing to test.


Best of luck. ....

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MF 135 ps overheated

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Imfedup
Join Date: Dec 2015
Posts: 52 Central Kentucky
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2022-03-22          200929


Quote:
Originally Posted by Murf | view 200925
When it comes to hydraulics the only real cause of heat is work, the more work, the more heat it creates. If you have not already done so, I would suggest you take a careful look at the power steering box. It is the only other piece left in the circuit. Thats a leaking internal seal will not be evident because the fluid is merely circulating back to the return line. However, the friction as it leaks past the seal will work very much like a partly open relief valve and cause excess work and therefore excess heat.Its a simple easy thing to test. Best of luck.

What exactly are you suggesting he test? And just how would he perform this test? You have my curiosity up now. ....

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