Well...I Broke My Arrma Mojave Grom...

[PewPewChris]

My guess is internal diff gears

I'm not mechanically inclined and learning...no idea where they would be housed in this front axle...they literally appeared (fell out) as I was working on the pinons on the front that were off.

 

[Lostinthewoods86]

I'm not mechanically inclined and learning...no idea where they would be housed in this front axle...they literally appeared (fell out) as I was working on the pinons on the front that were off.

 

[PewPewChris]

Yeah, I've seen that and it's also the front assembly. I still don't see on that schematic where those pinions are located

 

[WickedFog]

Yeah, I've seen that and it's also the front assembly. I still don't see on that schematic where those pinions are located

There will be 4 grooves in the back of that larger ring gear. The windows in that gear are clearance for those 4 bevel gears. I don't have one, so just guessing.

Place the 4 bevel gears in the ring gear, bevels facing inward. Slip the pin trough. Place the opposing drive cup/bevel gear on the shaft and hold it all together and place the assembly in the diff housing.

 

[PewPewChris]

I'll have to give it a whirl tomorrow at some point. Thanks for the input all!

 

[WickedFog]

I should have said that a bit differently after looking at it. Start with the parts from right to left in the exploded view above. You can stack it all together. Put a bearing down on your bench and place the drive cup face down into the bearing, with the bevel gear facing up. Put the pin in the center. Slide the spur on the pin, with the grooves for the small bevel gears facing up. Insert the 4 small bevel gears. Then place the last drive cup/bevel gear on the pin and slide the other bearing on.

 

[PewPewChris]

@WickedFog that is exactly what I needed to do. I got the Teton back together and ran it thru my track in the backyard and she's back to 100%!!

Thanks all for the input and guidance, much appreciated.

Now I've got to crack open my Mojave Grom and see why it won't work. Stay tuned, I know I'll need help lol

 

[WickedFog]

@WickedFog that is exactly what I needed to do. I got the Teton back together and ran it thru my track in the backyard and she's back to 100%!!

Thanks all for the input and guidance, much appreciated.

Now I've got to crack open my Mojave Grom and see why it won't work. Stay tuned, I know I'll need help lol

Almost all diffs in our RC stuff will be more or less the same, unless you get a ball diff. Then it gets interesting

 

[PewPewChris]

The more wrenches I turn on these little things I get a little more comfortable. Also, thank God for the internet

 

[PewPewChris]

Well, getting back to the initial reason I posted, the Mojave Grom. I got her cracked open, it's 100% the motor.

It wouldn't move...not a millimeter. I took the pinion off, the stem (I don't know the technical term) coming out of the motor is seized.

I assume I should just replace the motor as I see no way to "crack it open". Should I consider an upgrade since I have to replace it anyway?

 

[WickedFog]

Well, getting back to the initial reason I posted, the Mojave Grom. I got her cracked open, it's 100% the motor.

View attachment 202720
It wouldn't move...not a millimeter. I took the pinion off, the stem (I don't know the technical term) coming out of the motor is seized.

View attachment 202721
I assume I should just replace the motor as I see no way to "crack it open". Should I consider an upgrade since I have to replace it anyway?

Just for exploritory purposes, you should see some tabs on the can that lock the rear bell of the motor in. If you bend those out you can pull the motor apart and see what gave out in it.

If it got warm, the magnets inside the can could have come unglued. Or a bushing may have galled and seized.

 

[PewPewChris]

Just for exploritory purposes, you should see some tabs on the can that lock the rear bell of the motor in. If you bend those out you can pull the motor apart and see what gave out in it.

I'm going to try that in a bit, can't really make it any worse lol

 

[WickedFog]

I'm going to try that in a bit, can't really make it any worse lol

It's fun to find out what happened. Hell, you may be able to fix it.

 

[PewPewChris]

And just to confirm, that motor pinion should be able to move without being under power, correct?

 

[WickedFog]

And just to confirm, that motor pinion should be able to move without being under power, correct?

Yes. Something has it locked up.

 

[Hammer Down]

I bet it got really really HOT! These brushed groms are pushing the limit..
Arrma tried adding a fan to combat the excessive heat these little buggers put out, but beginners (no offense to the op) push them to the limit. I get it, I do the same..

I’d just toss a cheap brushless combo in there and wait for the diffs to POP…
Then once you sort that out, you’ll have a pretty tough little basher.

 

[PewPewChris]

I bet it got really really HOT! These brushed groms are pushing the limit..
Arrma tried adding a fan to combat the excessive heat these little buggers put out, but beginners (no offense to the op) push them to the limit. I get it, I do the same..

I’d just toss a cheap brushless combo in there and wait for the diffs to POP…
Then once you sort that out, you’ll have a pretty tough little basher.

I didn't run it too bad out of the gate, could have been operator error for sure but I don't think so. I got it replaced with a brushed for now, if it happens again I'll go brushless. It's back up and running and just did good out on my little track

 

[Lukedavis]

I can almost guarantee it's the built-in fan on the motor. the first day I had my Grom the built-in fan snapped off so now it just free floats in the motor around the rotor. Your's probably snapped off and got lodged in there. That is a weakness on those Mojave groms, minus the chitty diffs that strip just by looking at them.

 

[PewPewChris]

I can almost guarantee it's the built-in fan on the motor. the first day I had my Grom the built-in fan snapped off so now it just free floats in the motor around the rotor. Your's probably snapped off and got lodged in there. That is a weakness on those Mojave groms, minus the chitty diffs that strip just by looking at them.

TBD, the little I've run it, I really like it...and the body clips, etc...so easy to get running with it.