Broken Motor Shaft

We appreciate that the idea that a defective motor shaft may seem like something that could be possible, of course we feel that to be unlikely. The service center here at HOBBYWING have seen broken motor shafts over the years, but in most of the cases we were able to confirm, we found simple gear mesh or driveline issues to be the actual cause.

Replacing the motors has resulted in mixed topics. Some that "have the problem again", but then find something in the gears that caused the snapped motor shaft. We bring this all up, only so that the build moves forward and more fun can be had with the vehicle.

The shafts of the motors are made in large batches, and quality tested throughout the process. Even our most cost-friendly systems go through the same quality checks, testing, and control checks to ensure "bad batch" or fluke failures are uncommon.

Please inspect the vehicle closely for any possible gear issues or driveline topics that could interfere with gearing fit.

Inspect the spur and pinion, and look for any irregular/uneven wear. It may also be worth spinning each gear as well to look for any lateral, or horizontal "wobble". 

If the gears do not show any uneven wear and spin "true" the next topic to check would be the gear mesh. There is a sweet spot with how the gears mesh. (interlock to transfer power) If you hold either the spur or pinion and lightly wiggle the other gear you should feel the slightest movement with out the other gear moving. Excessive movement is not good, and if there is no separation between the gears, that can be even worse. 

Once again, we are bringing this up only to ensure that the replacement does not suffer the same issue that may be present.