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MF 275 Axle Pivot Rod Failure

Big Trouble?

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Richard Young i

06-26-2003 20:04:07

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Tonight while box blading a mound of shell-rock into the driveway, just after backing up onto a pile, the front end let loose and the circa 1969 MF took a nose dive into the freshly loosened dirt. The wheels and their struts had spun 90 degrees on the axle and the steering tie rod ends had disengaged themselves from their normal ball and socket joint configuration.

The connecting rod through the front axle had sheared off at one end (not sure whether front or rear but suspect rear). I came away with a shaft of steel tubing (one smooth and one sheared end) found under the axle when hoisted that is 8" long by 1.833" in diameter having a 0.243" wall thickness. The smooth end looks to have been inserted 1.21" into a forward or rearward receiver and the rod ran through the axle forming a horizontal pivot line for the axle. I suspect there is another 1.21" piece still in the opposite receiver.

The first question is whether this is one Big or one reasonable fix? Assuming a reasonable fix, can be accomplished in the field? Do I have to "break the front end from the rear - implying shoring both? What is involved?

A picture is worth a thousand words and a page or two from a repair manual (if I had one) would be a good place to start. Tomorrow, the library, then Saturday the parts dealer.

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Tom

06-28-2003 21:02:39

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Re: MF 275 Axle Pivot Rod Failure - Big Trouble? in reply to Richard Young in FL, 06-26-2003 20:04:07

I have a MF-690, 1983 model. The MF-690 replaced the MF-275. My repair manual is in the barn, sorry. My advice is to go to the MF dealer, order a MF Repair Manual and Parts Manaul. When ordering the manuals explain that you need prints of the pages on the pivot pin, from BOTH the Repair Manual and the Parts Manual. They can print you just those pages, and will be happy to since you have just ordered the manuals. You should have already had all the manauls for your tractor.

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David

06-27-2003 09:17:00

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Re: MF 275 Axle Pivot Rod Failure - Big Trouble? in reply to Richard Young in FL, 06-26-2003 20:04:07

Doesn't sound too major to fix unless there is consequential damage to steering rods etc. You'd need to block up under tractor engine and extract the broken bit of the pivot pin. Then you need to get axle back into place and slide new pivot back in. If possible it may be easier to take axle apart so that you can put central piece in then add outer parts of axle. This is just to make it lighter to handle. Don't see any reason that tractor would need to be split if problem is at front unless I'm missing something.

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Richard Young in FL

06-27-2003 10:45:45

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Re: Re: MF 275 Axle Pivot Rod Failure - Big Troubl in reply to David, 06-27-2003 09:17:00

That sounds like good news. I have not removed the sheet metal - yet. I do not know whether the front receiver is open and available to slip in a new pin from there or not. Taking the wheels and support parts off is a good idea as I am not going to have any help. Can the radius arm ends (ball and socket joints) be reused if they have been "wrenched" apart? I didn't see any physical damage to the sockets. I suspect, like any metal part, once it is expanded, it is better to replace than reuse - though I bet more than one has been reused.

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David

06-27-2003 10:58:36

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Re: Re: Re: MF 275 Axle Pivot Rod Failure - Big Tr in reply to Richard Young in FL, 06-27-2003 10:45:45

I think it will be self evident when you try to fit them back together whether they can be reused. If they are pulling out on their own they may need replaced. If you do refit them I'd be careful that there is no risk of the steering lankage coming apart as that could be pretty hazardous. Biggest hassle is just the sheer awkwardness of trying to get everything apart, lined up and back together again. Hopefully there is no damage to radiator, or fan or anything else. It won't be a five minute job though.

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