What's up everyone? New to the RC world but just bought myself an X Maxx to sink my time and money into lol. So I'm experiencing my first issue. If this is the wrong place to post this my apologies. Anyways here's the issue I am having. When I hit the throttle the engine is spinning but the wheels are getting no power at all. The front wheels are responsive and turn just fine but no power to any wheels.
Thanks ahead of time!
Welcome to the forum! Ok, so from what you said, we can determine that the problem is not the radio, receiver, ESC, or motor (servo is fine too, but that's not relevant here). So the issue must lie in your drivetrain.
As fellow member above have suggested, check if your pinion (small gear attached to the motor shaft), see if it's come off the motor shaft. (seems you already checked that actually) Also, check if the pinion hole (and/or motor shaft) is rounded out. You'll see that in RC, motor shaft are shaped like a "D" when looking at it from the front, the shaft is round, except there will be one part that is not round, it'll have a flat edge. The pinion will have an appropriately sized "D" shaped hole too, to match the shaft. Make sure that the pinion is on the shaft correctly, with the flat edge of the shaft connected with the flat cutout on the pinion hole. Next, if the shaft and pinion are not rounded, and they are seated correctly as above, check that your gear mesh between the pinion and spur (big gear that the pinion drives) is set correctly, the motor mount screws or the motor mount holes may have loosened or widened (respectively), the pinion should be pushed up against the spur, tight enough that the pinion can never loose contact with the spur under drive. However, the mesh shouldn't be very tight, there should be a little amount of play/slop between the two gears.
If still nothing so far is the problem, check your diff pinion gears, and the diff crown gears, see if they're stripped or heavily worn. Another method is give the car throttle, and see if the center driveshaft spins or not. If it doesn't spin, it's the pinion, spur, or the gear mesh. If it spins, then it's your diffs and the gears there, or possibly you've rounded out all 4 wheel hexes and/or the wheels. The issue could also be the center diff.
