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560 wheel hub clamp bolt

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fredmich

09-19-2005 17:45:11

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recently noticed that I have a bolt broken off on the rear wheel hub clamp and my wheel has moved a little on the shaft. Bolt looks to be 7/8? Are these bolts supposed to be fine or coarse threads? Also are they a hardened bolt to take the 400 ft lbs torque? And last is it supposed to have a lock washer under the head? Thanks any help is appreciated.

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ed1

09-20-2005 09:57:53

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Re: 560 wheel hub clamp bolt in reply to fredmich, 09-19-2005 17:45:11

A 560 putts out a good bit of HP. The bolts your referring to are generally ordered by part number from IH or one of the aftermarket suppliers. Are they true speciality not sure but you need to get the correct ones for your tractor.

Yes they will take a lot of FT lbs. Remember all of the tractors HP is transmitted to the wheels through that hub that is held together with 4 bolts. I generally use a 10ft bar to tighten them. not sure of the ft lbs just go till I cant go any further. If they get easy then the clamps should have been replaced anyway.

Older M's used course thread bolts The last of the line the 686 used fine thread grade 8 bolts that got thicker on the ends.

If you don't replace the broken one your going to mess up your axle. I'd also guess that at least one of the other bolts is bent. Yep you can bend a grade 8 bolt.

Never had a 560 but lots of M's and a 686 that I reciently sold so I'm not sure exactly where the change occured but the 560 makes sense when they went to a 6cyl engine. I do have some of the fine thread ones that fit the 686 I'd be willing to part with. Include your e-mail in your next response if interested.

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fredmich

09-20-2005 19:25:52

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Re: 560 wheel hub clamp bolt in reply to ed1, 09-20-2005 09:57:53

Yes I,m interested. My tractor is 200 miles away but I will be working on it this weekend so I'll be able to remove the other 3 bolts so I can remove the broken part of the bolt in the wedge. My e.mail is www.millfami@aol.com...Thanks Fred

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DWV

09-19-2005 18:53:06

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Re: 560 wheel hub clamp bolt in reply to fredmich, 09-19-2005 17:45:11

Fine threads and later tractors used grade 8 with no washers. Some used a straight bolt and then they changed to a little longer bolt with a bigger diameter up near bolt head.If I remember right the wheel that uses the longer bolt has 6 digit # 0n wheel that ends in R5 instead of R4.Also think the long bolt is 7/8 X 4 3/4 inch long and other 4 inch long.

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fredmich

09-19-2005 20:01:52

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Re: 560 wheel hub clamp bolt in reply to DWV, 09-19-2005 18:53:06

Thanks for the reply! The tractor is a 1961 Farmall and the nearest I could tell is that it was approx. 5" long which sounds like the one you describe. Also sounds like a dealer item? Thanks again.

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