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Uneven wheel torque

Uneven wheel torque

Old 02-20-2012, 10:01 PM
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Default Uneven wheel torque

I just tore down the entire rear end on my E Rustler. I cleaned and regreased my planetary gears and changed the spur gear. When I apply throttle, both wheels spin, but the left wheel has almost no torque. I can hold the axle and it doesn't even attempt to turn, while the right one torques like it should.

Any suggestions as to where I should start my troubleshooting?
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Old 02-20-2012, 10:05 PM
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Is the left wheel free? Can you spin it freely by hand when the power is off?
Perhaps the left hub bearings have seized up? If those are free check your diff bearings. If thats still not the case, perhaps you have simply overtightened the left rear wheel nut and caused it to seize up that way. Kinda hard to diagnose over the net.
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Old 02-20-2012, 10:09 PM
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Nothing has seized. All bearings are spinning free and freshly cleaned and lubed.
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Old 02-20-2012, 11:11 PM
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Originally Posted by Countryhb View Post
Nothing has seized. All bearings are spinning free and freshly cleaned and lubed.
Hmmm... Is your diff loose cause that's the usual suspects with a problem like this.
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Old 02-20-2012, 11:42 PM
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Originally Posted by thecman26 View Post
Hmmm... Is your diff loose cause that's the usual suspects with a problem like this.
This seems the most likely culprit. If it is spinning under power with no load then there is some power getting to the wheel so that would indicate an issue with your diff.

Also check that your pin is in the drive yoke, it's silly, but sometimes the silly things are overlooked.
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Old 02-23-2012, 03:18 PM
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Thanks for the replies. It seems like it is definitely a diff issue. When I spin one wheel by hand, the other wheel turns in the same direction, and not with as much force as I applied. Will the diff not operate properly without enough grease? I think I may have not packed enough grease when I rebuilt it. And should I be using silicone grease or lithium grease? I used the white grease that originally came with the car, but there wasn't much left and I need more.
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Old 02-23-2012, 04:10 PM
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The grease just keeps the gears from wearing and doesn't have anything to do with the diff operating or not operating.
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Old 02-23-2012, 04:20 PM
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Have you tried to drive it? It sounds to me like everything is working how it is suppose to, and you just don't know it. Drive it and see.
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Old 02-23-2012, 06:02 PM
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Originally Posted by h8thatadmin View Post
It sounds to me like everything is working how it is suppose to...
+1; that's an open diff and the wheel with less traction will get all the power. If you don't like it (I didn't) search around for the 'washer mod' or seal it and use normal diff fluid (there's a good fresh thread on this at UltimateRC).

Last edited by porterdog; 02-23-2012 at 06:04 PM. Reason: detail, man, detail!
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