Farmall M / 300 rear tires

DaddiosGarage · Apr 29, 2012

Are the rear axles on an M and a 300 the same? I"m looking to pull rears off a 300 for an M. And, it looks like I will have to cut the bolt heads off to get the rims. Never had a rear tire off, if I cut the bolt heads will the rim actually come off? It looks like there is an inside and an outside block that locks the rim on to the axle? Appreciate your thoughts!

truckerlary · Apr 29, 2012

If I remember right the axles on the M are bigger than the 300's. The 300 will be the same as the H axles. As for cutting the heads off the bolts that would be my last resort. I'd put a cheater bar on the breaker bar. These bolts are expensive and the least you will do is break the bolt which will be the same as cutting the head off. You might actually save some. Put penetrating oil down on the threads and let it soak or heat the casting. Larry

Icuby · Apr 29, 2012

Why cut the heads off the bolts? Just take the nuts off the bolts and the clamp will come off,therefor the tire and rim assy. comes off.

wisbaker · Apr 30, 2012

The H tractor grew up to be 3xx's, The M's 4xx's at least until the 460/560 came out. If you see a Super HTA it's a 300 or 350 with H sheet metal on it.

D Slater · Apr 30, 2012

Most farmall 300 tractors have a 2-1/2 inch diameter rear axle. Small percent of 300 tractors have whats called a heavy axle or 2-3/4 inch diameter axle. Thats the same size as a M axle and the cast centers will work on both axles.
Depending on the type wheel installed if the bolt heads are cut on the axle clamp or clamps they will loosen on the axle but won't come out of the wheel. So then bolts have to be cut off agian after the wheel is removed from the axle to get the clamps out. Then there's the job of getting the cut bolts out of the clamps if reuseing. If the 300 has 8 spoke cast wheels the clamps will be different from a 6 spoke used on a M. Unless the 6 spoke wheel is a later replacement from IH then the 6 and 8 spoke wheels for a 2-3/4 inch axle use the same axle clamps. Thats not common though. You may already know the 6 and 8 spoke wheels use a different rim.
Also if you mean the rim clamps, if the 6 spoke wheel is turned right on the axle just the nuts and clamps on one side need removed. On the 8 spoke wheel one nut and bolt per clamp.

riverbend · Apr 30, 2012

I wouldn't cut the heads off the bolts that hold the wheel center to the axle clamp unless you have a plan for getting the clamps out of the hub.

For bolts that have been tightened by King Kong either I borrow my neighbor's 3/4" drive sockets or I use and old 1/2" ratchet that has had its head filled with braze. Add a 4' piece of 1 1/4 pipe usually persuades the stubbornest bolt to turn.

If you are not in a hurry, soaking the clamp bolts with your favorite flavor of pennetrating oil won't hurt anything. The clamps are open at the botton and will hold a fair amount of oil. A little vibration and heat will help too.

If I have mistaken what you are trying to do, usually the rim refers only to the every outside part of the wheel that the tire mounts on. In that case, cut away. Use grade 5 bolts as replacements.

Greg

mkirsch · Apr 30, 2012

Unless you have a VERY EARLY 300, even just the rims will NOT fit on an M.

Count the number of spokes in the wheel center. If 6 then you have drop-center rims. If 8 then you have double-bevel rims.

All M's came from the factory with drop-center wheels.
Most 300's came from the factory with double-bevel wheels.

You can NOT mount drop-center rims on a double-bevel wheel.

You can NOT mount double-bevel rims on a drop-center wheel.

The only way to transfer the tires is to dismount them from the rims and switch them over the hard way. Sorry for the bad news.

CNKS · Apr 30, 2012

Riverbend, you are correct about that. I broke two of those bolts off with about 3 feet of leverage. Had to melt the bolts with a torch to get them out. Luckily I avoided melting the clamps or enlarging the hole in the wheel. I use a torch for such things only as a last resort.

CNKS · Apr 30, 2012

Mine were rim clamps, I misread the post--not sure I could twist off an axle clamp bolt.

riverbend · Apr 30, 2012

I love my torch. It has saved my bacon many times. I reach for it when I don't want to break something. I do need to remember if there is a hole in my glove...

Greg

Farmall M / 300 rear tires

DaddiosGarage

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truckerlary

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Icuby

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wisbaker

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D Slater

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riverbend

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CNKS

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riverbend

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