Cub differential

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Cub differential

Postby cuznguido » Tue Oct 02, 2018 6:32 pm

I have been inside many differentials, so I know how they work, however never been inside a cub. Is the diff on a cub locked, but this seems like a definite no to me because of the need for tight turning and individual brakes. So my question is, why will one wheel not turn on this cub when the other wheel is held. Normally I would just assume that it has a spider gear problem but I really do not want to tear into this thing just yet.

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Re: Cub differential

Postby Glen » Tue Oct 02, 2018 7:07 pm

The differential on a Cub is not locked.
Below is a page from the Cub parts manual showing the differential and gears in it. ... 007-06.jpg ... 007-07.jpg

The tractor should turn to the right or left when driving it, and one one rear wheel should turn faster than the other during the turn.
If something is binding, first check the brakes and see if they are releasing fully. They are in the final drives, where the brake rods go into the housings.

Below is a page showing the brakes. The area where the brakes are should be dry, no oil in the area.
They are areas between the transmission and the final drives.
You didn't say what year Cub you have. There were 2 styles of brakes used, it shows the serial numbers in the pic when the first style was used. :) ... 004-02.jpg

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Re: Cub differential

Postby John *.?-!.* cub owner » Thu Oct 04, 2018 2:55 pm

Assuming both wheels are off the ground, make sure the transmission is in neutral. Just because the shifter is in neutral does not mean the gears have disengaged, the knob of the shifter can break off, or wear and slip out of place, or the piece the knob fits into cub loose or break and it not move the rail to move the gear.
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