Okey im not so good at repairing Rc Cars but irepaired it now nad now after two days i got this problem. If i throttle it just sounds but the car is not moving???
Ive looked on it and i screwed a thing up and looked on it and putted it back. If someone wants me to put a video up i could do it anytime Thanks!
Model: Hsp Monster 1:10 Nitro
Its about 2 years old and ive drived it 3-4 times i think and it was the first time i drove it ..
I had this problem before but my friends friend fixed it .

would love to help but we need way more info.

what model is it?

brand?

can you post pics?

Its an HSP Monster 1:10 Nitro.
If u want a movie or pics ill fix em tomorrow
I think its 2 years old but ive drived it about 3 times and ive had this problem before

i believe thats a simillar model to the redcat volcano.

when the motor spins, does the clutch bell(pinion gear) move?

next, does the spur gear move?

if those move, then the problem could be in the diffs.

or it could be that the center driveshafts cups are slipping. check the grub screws the the drive cups by the center diff and the front/rear diffs.

Your pinion gear is probably not in contact with the spur gear. Turn your car on and be looking at the pinion gear and just pull the trigger and if the pinion is moving but not the spur theres your problem, but if the pinion is not moving tighten the screw on the pinion.</p>