9398 crawler please help

[Macmanu]

Hello everyone

I just finished to assembly the 9398 and have noticed that the left wheels (front and rear) barely spin.

When I grab one of the right side wheels then the left would start spinning

Is this normal?

Thanks

[JGW3000]

You may have some gears installed too tight, there should be a slight gap between gears and any adjacent beams or elements.

Is the issue when the motors are running or when they are off? Not sure if this is a reason, but did you remember to center the servo motor (first few steps in the instructions) before installing it?

[Coola1]

You shouldn't worry much, thats the differential working. It transfers all power to the wheel with less strain, I guess the wheels on the right are a little tighter than the left. But don't worry, because when all wheels are on the ground, both sides will be spinning.

[Macmanu]

Thanks!

[Rockbrick]

and the more you use it the tight side should loosen up after a few crawls gone wrong across the sofa!

[__________________________]

I recommend you use a differential lock like this: http://sariel.pl/2012/05/compact-axle-with-a-differential-lock/

Or abandon diff locks for knob wheels, like this:

And if you have Power Pulller wheels you should add them!