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XRAY - Model racing cars :: View topic - XB4 2018 Molding problem with differential crown gears?
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XB4 2018 Molding problem with differential crown gears?
https://setup.teamxray.com/xsetup/legacy/viewtopic.php?f=101&t=19632		 Page 1 of 1
Author:  Sébastien [ Sun Nov 12, 2017 17:34:56 ]
Post subject:  XB4 2018 Molding problem with differential crown gears?
Hi!

Is somebody noticed a molding problem with front & rear differential crown gears?
I have some metal protrusions, an excess of molded metal between differential bevel Gear's teeth and in the four holes :( I had to remove some metal to put the four screws.
I'm surprised because the 2018 features says : "Improved construction and production details on both front & rear differential crown gears results in quieter operation and increased reliability"
I've never seen this on my previous XB4.
After four five minutes run, I can see some damages on the drive gears. (I use graphite Hudy grase on it)

Any idea?

Thanks
Author:  Martin Bayer [ Tue Nov 21, 2017 09:24:14 ]
Post subject:  Re: XB4 2018 Molding problem with differential crown gears?
Hello

Very strange, i did on my 2018 kit gears about 100 batteries and when i check there was no problem.
Author:  TPR 1 [ Fri Nov 24, 2017 05:28:25 ]
Post subject:  Re: XB4 2018 Molding problem with differential crown gears?
I have a similar problem with my diff gears they are very notchy and are not smooth at all .
There is excess metal in between the teeth which is causing the mesh to bind .
I have never had this problem with my 15 ,16 ,17.
Author:  Martin Bayer [ Fri Nov 24, 2017 07:59:27 ]
Post subject:  Re: XB4 2018 Molding problem with differential crown gears?
They need to be break-in. After some runs it should be ok.
Author:  Sébastien [ Sat Nov 25, 2017 14:36:30 ]
Post subject:  Re: XB4 2018 Molding problem with differential crown gears?
Yes, probably, but with the previous XB4 it was perfect even before beak in, so I am surprised...
Thank you for your answer!
Author:  Cosmo88 [ Thu Jan 18, 2018 05:03:46 ]
Post subject:  Re: XB4 2018 Molding problem with differential crown gears?
1 - 5 Personally, I'd like to see a total re-design with center-line battery placement. This would solve a lot of the lipo, 5 cell, 6 cell, 4 cell, etc balance problems. If done correctly, this could allow for a lot of different battery options with the same chassis without a lot of special option parts.
Author:  Martin Bayer [ Mon Feb 05, 2018 09:14:08 ]
Post subject:  Re: XB4 2018 Molding problem with differential crown gears?
Hello, what kind of battery you like to use in XB4?
Author:  Hawkeye [ Sat Mar 31, 2018 23:38:43 ]
Post subject:  Re: XB4 2018 Molding problem with differential crown gears?
@Cosmo88 Not sure why you'd want to run other than LiPos in an XB4. It's an elite performance car. Why put the R/C equivalent of a 50cc two-stroke in a Formula 1 chassis? :?
Author:  Hawkeye [ Sat Mar 31, 2018 23:43:16 ]
Post subject:  Re: XB4 2018 Molding problem with differential crown gears?
Back on topic: I filed some of the casting flashing off the crown gear for the front and rear diff, which was a bit if a time-consuming job, but I don't think it needed it. Mine has had about 30 runs through it and the crown and pinion are both in great shape.

I'm running a spec motor class and have since replaced the metal parts with the composite options - much better acceleration.
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