Well.... I found the banging noise and I need some advice...

56oliver · Apr 17, 2015

So I took the transmission cover off and it didn't take me long to find it... One of the bull gears has a tooth missing. Looks like it broke clean off. Other than that the other gears all look fine. So here's the question, what caused this? What is the best way to fix it... Can it be welded and ground down into a new tooth or should I just look for a new gear and replace it. How hard are they to replace? And also, when I replace it is there anything else I should check while I'm inside it?

Thanks.
Jake

Janicholson · Apr 17, 2015

Assuming it is the oliver, Replacing the gear with a used one is the option of choice. Repairing a gear is possible but only done when there are no replacement, or extreme prices are found, with a high value tractor. Jim

fixerupper · Apr 17, 2015

I'm sure there are plenty of them in salvage yards. Someone might have slammed on a brake too hard at a fast speed and that tooth happened to be the one that took the shock. It can happen to a two banger Deere. Ask me how I know.

John B. · Apr 17, 2015

Replace the gear. Make sure you count the number of teeth that are on it so the replacement gear is the exact same. There should be plenty of them out there some where in a salvage yard.

What caused it? I would have to say it was the weakest point.

Bad part about bull gears is there is only one tooth in contact at a time when meshing with the mating gear. Unlike bevel tooth gears where
you have 2-1/2 teeth meshing with the mating gear.

notjustair · Apr 17, 2015

And find that missing tooth.

chucksoliver77 · Apr 17, 2015

you will need one from a super 77 or 770. the rowcrops have smaller axles and different splines on the axle and in the bull gear. find the broken tooth and look for anything in there that may have caused the damage. Had a ball bearing come apart on the pto and did some damage in mine once. Chuck

J. Schwiebert · Apr 17, 2015

The gear must be from a super 77 or a 770. A 77 gear has the same number of teeth, BUT the splines for the axle are different. Questions?

jeffcat · Apr 17, 2015

Had it happen on a IH 450 many many years ago. Take the whoke side of the tranny apart and if you are lucky you can get all of the big bad bolts that hold the bull gear on the axel. Check the mate gears and like other posts look for bearings etc. Wait till you find the broken tooth. It should be pretty small. Case harden and all forget repairs unless you like taking tractors apart! Jeffcat

Cas · Apr 18, 2015

I vote for not repairing and do not worry about it not being and exact mate to the bull pinion gear.

gordey · Apr 18, 2015

It would be smart to replace the crown gear rivets with bolts while its apart,

LarryH · Apr 18, 2015

we are parting out a 770 call link_disallowed days asl for larry thanks

Frank 41 · Apr 19, 2015

Must have been related to the 1950 that I had once. Two bull gears and an axle in my time with it being in the hospital. That 4-53 was sure hard on the rear end or maybe it was the noise.

Well.... I found the banging noise and I need some advice...

56oliver

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Janicholson

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fixerupper

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John B.

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notjustair

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chucksoliver77

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J. Schwiebert

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jeffcat

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Cas

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gordey

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LarryH

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Frank 41

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