Bull Gear M

moonlite 37 · Aug 20, 2008

when changing grease, I found a bull gear tooth in transmission oil. I was doubting if I could get the bull gear out without pulling the axel. I doubt it but think there is a possibility of just sliding the axel out just a short ways. Manual says to remove wheel and remove axel. Just looking for an easier way. Would it be possible to slide axel housing out a ways? A neighbor (good mechanic) said he has seen some run a long time on light to moderate work with one tooth missing. Any experience in this repair?

Mike L · Aug 20, 2008

I did it that way on an H
Slid the axel out about 4 inches
and pulled the gears
H and M Farmalls are simular in design.

Janicholson · Aug 20, 2008

In the archives, there are many posts on changing the Pinion bearings in front of the bull gear. I would check those as they direct you to the steps needed to remove the bull gear WO removing the axle entirly. JimN

Wayne from MN · Aug 20, 2008

You need to remove the transmission cover to replace the bull gear. Be careful loosening the cover cap screws; blow all dirt away and carefully turn your socket handle both left & right until you are sure the cap screw is loosening easily. The belt pulley (if present) will need to be removed first. Shift the transmission to neutral.
Unless you have a shop crane or loader, get 3 strong friends to help lift the cover off.
Block carefully under the transmission housing and block the opposite rear tire so nothing is going to endanger you. Remove the tire-wheel assembly, loosen the axle housing cap screws, loosen the bull gear cap screw while placing a spacer between the 2 bull gear cap screws. This will force the axle out of the gear you are replacing.
Needless to say, this is a good time to replace all the lube in the rear end; turn the belt pulley over to drain about a pint or so of old oil out at the same time. There is a small drain plug on the belly of the tractor under the belt pulley area that will drain the front housing area as well.
Good luck.

Roger46 · Aug 21, 2008

If you have a tooth out on the bull gear you also may have damage on the pinion gear. Years ago my dad was driving the Super H plowing and all of a sudden the tractor stopped. For some reason he put the tractor in low gear and let out the clutch at which point he heard a crunch and then a clicking sound every time the wheel went around. He had knocked out a tooth in the bull gear and also severely damaged one of the teeth on the pinion gear. Turns out a bearing had gone out and one of the cracked balls got between the teeth. So it turned out to be an expensive repair. I think if you run it that way even under light load you are asking for trouble as it is likely that you may knock out more teeth. Also as a side note, the last time I tried to get an M axle housing gasket they weren't available and I had to make one (not an easy gasket to make). Roger

Bull Gear M

moonlite 37

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Mike L

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Janicholson

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Wayne from MN

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Roger46

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