Kraton Stripping Pinion Gears

[RC-RAD]

Within the last 2 weeks I’ve managed to strip a 13t pinion gear on my O4S and a 15t pinion gear on my K4S.

What may cause this? Am I too aggressive on the throttle? Gear mesh too tight (I don’t think so because there’s definitely some play between the spur and pinion). Maybe a rock got into the power module and stripped my pinion? My diffs are fine and are not stripped in both rigs which is surprising to me.

Anyways, thanks in advance for the advise.

 

[SarsK9]

Gear mesh too loose maybe?

 

[Rcproponent]

Too loose or adjustment came loose while driving?

 

[Camaroboy383]

Kind of looks like a end can bearing failure...Check for shaft play side to side.. bearings in the motors are know for being bad.. if you have any side to side play it's a wrap for the gears..✌

 

[RC-RAD]

Kind of looks like a end can bearing failure...Check for shaft play side to side.. bearings in the motors are know for being bad.. if you have any side to side play it's a wrap for the gears..✌

Motor shaft is totally fine.

I wanna assume the gear mesh came loose. Seems like the accurate culprit.

 

[Camaroboy383]

Motor shaft is totally fine.

I wanna assume the gear mesh came loose. Seems like the accurate culprit.

What mount do you have in them? If it's fixed it can only be loose due to a bent motor mount, or bearing failure

 

[RC-RAD]

What mount do you have in them? If it's fixed it can only be loose due to a bent motor mount, or bearing failure

ARRMA adjustable motor mount.

 

[Camaroboy383]

ARRMA adjustable motor mount.

Well that will definitely do it.. so your only two options are, motor came loose, or the mesh was set incorrectly..

 

[Rcproponent]

Try some permatex orange

 

[Brushlesspower83]

pps adjustable motor mount is s grest upgrade. i beat the poo out of my cars and its never backed out. i run a 1650 max6 combo.

 

[JAM]

Am I crazy or is the gear on the shaft backwards?

 

[RC-RAD]

Am I crazy or is the gear on the shaft backwards?

I normally have it the other way. I removed it and put it back on the shaft to take the picture.

good eye

 

[Rcproponent]

Did you ever solve your problem? To me it looks like the motor mount screws may have wiggled loose while driving. Do you use loctite on them?

 

[RC-RAD]

Did you ever solve your problem? To me it looks like the motor mount screws may have wiggled loose while driving. Do you use loctite on them?

yeah the motor screws backed out. I try not to loctite those screws since I switch out pinion gears pretty often.

 

[jkflow]

Always use loctite (blue) and let it sit for 24h to cure.
Other use red or orange, I'm happy with blue. Just make sure the threads are clean.

 

[Rcproponent]

yeah the motor screws backed out. I try not to loctite those screws since I switch out pinion gears pretty often.

Yea I hear you, loctite is a pain, but it can help you from losing pinions... when things get warm down there... doesn’t matter how tight you make things, without loctite on the pinion it’s for sure going to come loose.