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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC 1/8th Scale Buggies >> CRUNCH?
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CRUNCH? - 1/25/2004 6:42:58 PM   
Model Mania


 

Posts: 420
Joined: 12/21/2003
From: Magheralin, UNITED KINGDOM
Status: offline 		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!
       Post #: 1

RE: CRUNCH? - 1/25/2004 6:56:20 PM   
lendaddy


 

Posts: 96
Joined: 12/29/2003
From: , MI, USA
Status: offline 		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?

(in reply to Model Mania)
       Post #: 2

RE: CRUNCH? - 1/25/2004 6:57:45 PM   
Model Mania


 

Posts: 420
Joined: 12/21/2003
From: Magheralin, UNITED KINGDOM
Status: offline 		No its a standard MP7.5 kit

(in reply to lendaddy)
       Post #: 3

RE: CRUNCH? - 1/25/2004 7:15:50 PM   
sh0wtime



Posts: 2316
Joined: 7/28/2003
From: London, UNITED KINGDOM
Status: offline 		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

(in reply to Model Mania)
       Post #: 4

RE: CRUNCH? - 1/25/2004 7:17:50 PM   
Model Mania


 

Posts: 420
Joined: 12/21/2003
From: Magheralin, UNITED KINGDOM
Status: offline 		Thanks showtime, will do

(in reply to sh0wtime)
       Post #: 5

RE: CRUNCH? - 1/25/2004 7:25:24 PM   
sh0wtime



Posts: 2316
Joined: 7/28/2003
From: London, UNITED KINGDOM
Status: offline 		get in contact with Russ at Top Options for decent prices on Kyosho parts etc in the UK
he does mail order too

(in reply to Model Mania)
       Post #: 6

RE: CRUNCH? - 1/25/2004 7:28:36 PM   
Model Mania


 

Posts: 420
Joined: 12/21/2003
From: Magheralin, UNITED KINGDOM
Status: offline 		I work in a my hobby shop no prob with cheap parts

(in reply to sh0wtime)
       Post #: 7

RE: CRUNCH? - 1/25/2004 8:52:26 PM   
k-carboy


 

Posts: 277
Joined: 7/31/2003
From: New Bloomfield, MO, USA
Status: offline 		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.

(in reply to Model Mania)
       Post #: 8

RE: CRUNCH? - 1/26/2004 4:39:23 PM   
Model Mania


 

Posts: 420
Joined: 12/21/2003
From: Magheralin, UNITED KINGDOM
Status: offline 		Which bearing was it?

(in reply to k-carboy)
       Post #: 9

RE: CRUNCH? - 1/27/2004 5:55:11 AM   
k-carboy


 

Posts: 277
Joined: 7/31/2003
From: New Bloomfield, MO, USA
Status: offline 		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.

(in reply to Model Mania)
       Post #: 10

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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC 1/8th Scale Buggies >> CRUNCH?
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