XRAY - Model racing cars

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 Post subject: XB4 2018 Molding problem with differential crown gears?
PostPosted: Sun Nov 12, 2017 17:34:56 
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Joined: Sun Nov 12, 2017 16:56:07
Posts: 3
Location: France
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


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 Post subject: Re: XB4 2018 Molding problem with differential crown gears?
PostPosted: Tue Nov 21, 2017 09:24:14 
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team driver
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Joined: Tue Apr 25, 2006 16:50:44
Posts: 193
Location: Czech Republic
Hello

Very strange, i did on my 2018 kit gears about 100 batteries and when i check there was no problem.


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 Post subject: Re: XB4 2018 Molding problem with differential crown gears?
PostPosted: Fri Nov 24, 2017 05:28:25 
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Joined: Thu Feb 09, 2017 04:38:05
Posts: 2
Location: South Australia
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.


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 Post subject: Re: XB4 2018 Molding problem with differential crown gears?
PostPosted: Fri Nov 24, 2017 07:59:27 
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team driver
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Joined: Tue Apr 25, 2006 16:50:44
Posts: 193
Location: Czech Republic
They need to be break-in. After some runs it should be ok.


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 Post subject: Re: XB4 2018 Molding problem with differential crown gears?
PostPosted: Sat Nov 25, 2017 14:36:30 
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Joined: Sun Nov 12, 2017 16:56:07
Posts: 3
Location: France
Yes, probably, but with the previous XB4 it was perfect even before beak in, so I am surprised...
Thank you for your answer!


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 Post subject: Re: XB4 2018 Molding problem with differential crown gears?
PostPosted: Thu Jan 18, 2018 05:03:46 
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Joined: Thu Jan 04, 2018 06:11:23
Posts: 3
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.


royal1688


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