Re-release Brat Gear Box Slipping

[WEE DAVIE]

Got lots of cracking noises coming from my brat gear box, ive replaced the spur gear and the plastic diff gear, but still makes the same noise, ive checked all the teeth on the other gears and they all seem fine please could someone tell me what the problem is. Im running it with a timiya lightly tuned moter and using the high speed gearing.

Cheers

[bside]

Got lots of cracking noises coming from my brat gear box, ive replaced the spur gear and the plastic diff gear, but still makes the same noise, ive checked all the teeth on the other gears and they all seem fine please could someone tell me what the problem is. Im running it with a timiya lightly tuned moter and using the high speed gearing.

Cheers

Having the same problem...Just rebuilt my vintage MubBlaster (same chassis/gearbox) and I'm getting a cracking noise under hard acceleration while cornering or on bumpy terrain...

Starting taking the gearbox apart last night and it looks like the spur gear is maybe a little damaged so I thought maybe the mesh was off.

Did you manage to solve the problem you were having?

[NJhopper]

I run ORV's like you guys and stuff like this happens ALOT. If you run anything more than the stock motor eventually something is going to go wrong.

Wheather its the gears, the side plates flexing out or the dogbones and joints something is going to go belly up. Now since you checked out the gears and its still goes clackity clack clack check out the dog bones they might be giving up or you can check your pinion. The pinion that come with it is alloy, it will wear out. Check the teeth if they look like **** get a steel one or another alloy if you want.

[bside]

I run ORV's like you guys and stuff like this happens ALOT. If you run anything more than the stock motor eventually something is going to go wrong.

Wheather its the gears, the side plates flexing out or the dogbones and joints something is going to go belly up. Now since you checked out the gears and its still goes clackity clack clack check out the dog bones they might be giving up or you can check your pinion. The pinion that come with it is alloy, it will wear out. Check the teeth if they look like **** get a steel one or another alloy if you want.

Thanks NJhopper. I'm using the original pinion and bevel gears so I think I'm going to replace and rebuild and do something like the frogshot mod to prevent the diff from seperating. Hopefully will work.

Cheers!

[NJhopper]

Thanks NJhopper. I'm using the original pinion and bevel gears so I think I'm going to replace and rebuild and do something like the frogshot mod to prevent the diff from seperating. Hopefully will work.

Cheers!

Just go through each part that has anything to deal with the tranny and you will find the problem, its just a process of elimination.

[TamiyaDan]

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[HunterZero]

You can try shimming the diff with Tamiya 5mm shims. Worked for my Frog.

- James

[pastimesteve]

You can try shimming the diff with Tamiya 5mm shims. Worked for my Frog.

- James

Hi James. Do you have a picture of where you put the shims? I realize it sounds like a dumb question (I'm good at those), but I'm having a hard time picturing this.

Thanks!

Steve

[HunterZero]

Hi James. Do you have a picture of where you put the shims? I realize it sounds like a dumb question (I'm good at those), but I'm having a hard time picturing this.

Thanks!

Steve

Don't have a pic, unfortunately. They go between the large bevel gears and the bearings. You need to put the gearbox joint shafts through the bearing as you put the shims in, and hold them in place on the bearing with a dot of grease to make it easier to put together. Try to avoid greasing the bevel gear side if you can, just use a tiny bit of grease the bearing side.

Start with the thinnest shims, and change to thicker ones if there's still a problem.

A small amount of wear on the diff bevel gears is usually enough for them to slip, combined with the gearbox side plates flexing outwards. You can use some AW grease or molybdenum grease in the diff gears to make them a bit more sticky and last a bit longer.

- James

[pastimesteve]

Ahh...thanks James! Much appreciated! I've used the AW grease already on the gears, and the diff seems to be happy. I like the shim idea though; I'm just not sure if I have any of those around...

Steve

Don't have a pic, unfortunately. They go between the large bevel gears and the bearings. You need to put the gearbox joint shafts through the bearing as you put the shims in, and hold them in place on the bearing with a dot of grease to make it easier to put together. Try to avoid greasing the bevel gear side if you can, just use a tiny bit of grease the bearing side.

Start with the thinnest shims, and change to thicker ones if there's still a problem.

A small amount of wear on the diff bevel gears is usually enough for them to slip, combined with the gearbox side plates flexing outwards. You can use some AW grease or molybdenum grease in the diff gears to make them a bit more sticky and last a bit longer.

- James

[bside]

Great advice! Thanks everyone!