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Old 06-11-2007, 05:38 PM   #1
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Default Motor problem with B4

I have a FTB4, and recently, it has been going through motors faster than usual. I just installed a Trinity Monster, and was running it for about a minute or so brand new. It made a really loud sound even when I set the mesh with a piece of paper in between. The spur looked a little beat up. Is the problem in the spur?

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Old 06-11-2007, 07:22 PM   #2
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Hey there. I had a few problems with that too (when I was new). You may want to double-check to make sure that your pinion gear and motor screws are tight (use a box-end, not ball-end allen). If this does not work, check to ensure that your slipper and transmission are set up properly. (BTW, I'm new here, not new to R/C)
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Old 06-11-2007, 07:49 PM   #3
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check and make sure your spur gear rotates without any wobble. Could be you bent something.
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Old 06-11-2007, 07:59 PM   #4
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It could be the spur and it could be the pinion. If you look at your pinion and it looks more like a sharks tooth then the orifinal pinion then it is worn. You will need to replace the pinion and the spur.

This area is usually one of the noisy areas on many electric vehicles. You can also check the transmission without the motor in to make sure everything is free.
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Old 06-11-2007, 10:23 PM   #5
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Check to make surre that the screws going through the gearbox (to the motorplate) are snug. I had an instance where mine backed out, loosening the tranny from the motor plate. I hit a jump, and everything shifted, hosing my pinion and spur.
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Old 06-11-2007, 10:28 PM   #6
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The other most often overlooked part is a bent motor plate. This can often be the cause of gear whine that never quite goes away.

I don't see what the two problems have to do with each other though? Replacing the motor is a problem or the noise?
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Old 07-30-2007, 10:17 PM   #7
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I finally got around to looking at it. I loosed the screws holding the transmission together to the motor mount plate, and apparently you can torque them down too much so that it squeezes the transmission. Runs much better now.
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Old 07-30-2007, 11:49 PM   #8
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I was just about to suggest that! You must find the perfect balance between being not too tight and not too loose.
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Old 07-31-2007, 12:21 AM   #9
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Quote:
Originally Posted by StOnEfAn527 View Post
I finally got around to looking at it. I loosed the screws holding the transmission together to the motor mount plate, and apparently you can torque them down too much so that it squeezes the transmission. Runs much better now.
Wow, jeff took you a month to get around to fixing it
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Old 07-31-2007, 12:29 AM   #10
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If your motor shifts then it will damage the spur gear. Make sure the motor screws are tight. The teeth on the spur might have gotten stripped. Make sure also you mesh isn't to tight or loose either as to this will make it real loud as well.
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Old 07-31-2007, 12:35 AM   #11
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^That's happened to me before, ruined my spur gear.
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