Model Mania

Every time i pull the brakes on my MP7.5 thers a crunch sound from the gears. Its happened before and i ended up replacing the rear diff gears but the rear diff was also jammin but its not jammin now. I thought it was because a bit of grit got into the diff case or somethin but i never found the route of the problem. Anyway ive just replaced the gears and ran 3 tanks through the buggy and its crunchin again. Does anyone have any ideas?. Please help![]

lendaddy

could be any of the front/rear/or center spider gears or either the front or rear ring and or pinion gears. Is this an RTR Inferno?

Model Mania

No its a standard MP7.5 kit

sh0wtime

sounds like the ring gear on the outside of your diff slipping on the pinion!
you need to remove the diff then shim it over inside the casing so its pushed against the pinion
you should've got the shims/thin washers in your kit
check the gear & pinion for wear/ missing teeth while its out too

Model Mania

Thanks showtime, will do

sh0wtime

get in contact with Russ at [link=http://www.topoptions.com]Top Options[/link] for decent prices on Kyosho parts etc in the UK
he does mail order too

Model Mania

I work in a my hobby shop no prob with cheap parts

k-carboy

i had a bearing go out once and caused this very problem. trashed the ring and pinion gears. try aftermarket bearings- way better! this is my biggest complaint with k-cars.

Model Mania

Which bearing was it?

k-carboy

it was the left side rear diff bearing (the one that the diff rides on inside the gear case). evidently there is a problem with dirt getting in there and trashing the bearing. when it goes out the ring and pinion get too much play and start to slip. if you caught it soon enough your gears might be ok. obviously i didnt.