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Old 01-31-2006, 09:43 PM   #1
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Default rc12l4: diff is rough

has anyone experienced these problems, my kit is brand new, never used. everytime i spin it, it feels rough and i have a lot of grease in the balls.
i followed the instructions completely and it still feels shitty. hopefully someone else has ran into this b4
thanks, colin
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Old 01-31-2006, 10:44 PM   #2
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Collin,
Only a couple of things could cause that. Usually it's the 1/4x3/8" bearing in the hub that is shot. Second, the balls and/or plates could have been bad or slipped causing pitting. But since you said that it is new, there is a chance that you may have initially over-tightened the diff and then backed it off. But the damage can be easily done to that hub bearing. I do have the real cure if you email me.

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Old 02-01-2006, 01:59 AM   #3
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I found that the bearings that come with the L4 are not that smooth, also you don't want lots of grease, only a tiny amount on each ball, lots of grease means you need to have it tighter to stop it slipping. Have a look on the IRS website on how to build the perfect diff.
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Old 02-01-2006, 04:30 PM   #4
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well i dont think its a problem with the balls in the spur. its when i tighten the nylon nut up, then i spin each side of the wheels and its rough as hell

btw where can i find this irs website?? i couldnt find it on google
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Old 02-01-2006, 04:37 PM   #5
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Quote:
Originally Posted by Colin85
well i dont think its a problem with the balls in the spur. its when i tighten the nylon nut up, then i spin each side of the wheels and its rough as hell

btw where can i find this irs website?? i couldnt find it on google
i think you are over tightening the nut. loosen it until its smooth and not slipping. click here for more tips
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Old 02-01-2006, 04:57 PM   #6
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no, ive tried loose tight medium . it will only feel good when i take the nut off and push against the thrust cone and bell washer it will feel good. nice and smooth. something is wacked???
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Old 02-01-2006, 05:00 PM   #7
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Quote:
Originally Posted by Colin85
well i dont think its a problem with the balls in the spur. its when i tighten the nylon nut up, then i spin each side of the wheels and its rough as hell

btw where can i find this irs website?? i couldnt find it on google
www.teamirsrc.com
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Old 02-01-2006, 05:01 PM   #8
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is something is broke, then it would be the diff bearing. slapmaster makes great thrust bearing to replace that part
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Old 02-01-2006, 05:11 PM   #9
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You also need to break it in to seat everything. Turn the motor on while holding 1 wheel and let it spin for about 30 seconds. Then grab the other wheel and do the same. this will help a lot I think.
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Old 02-01-2006, 05:32 PM   #10
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Quote:
Originally Posted by dakrat
is something is broke, then it would be the diff bearing. slapmaster makes great thrust bearing to replace that part
the bearings are fine, their brand new!


ill try gixxer's idea
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Old 02-01-2006, 05:39 PM   #11
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Make sure there are no burs or dirt on the spur where the rings ride and diff balls are located. In the past I have had issues with spurs just not working correctly, and then put on a new one or another brand, which cured the problem. In addition, notice if rings are groove if not new.

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Old 02-01-2006, 05:52 PM   #12
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I had the same problem but then i did what gixxer said
and now its sweet as
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Old 02-01-2006, 06:05 PM   #13
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My diff always feels like crap for some reason when I put it back together but as soon as I break it in, it feels fine.
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Old 02-01-2006, 06:27 PM   #14
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Quote:
Originally Posted by GrandeGixxer
My diff always feels like crap for some reason when I put it back together but as soon as I break it in, it feels fine.
I will second that. I hold each tire for a minute(i thin per crc's web site) though.
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Old 02-01-2006, 10:21 PM   #15
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my brothers is much smoother, but ill try holding it while giving it gas
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