NM190

A friend of mine just wrecked the gearboxes on my KV-1, which ones should i buy? And also: how the hell do i remove the sprocket wheels on said KV-1 without breaking the plastic part back there? Do they come apart?

FreakyDude

First off to get the wheels off, Use a flat screwdriver and gently pry the round cover off the rear drive wheels. Under the cover will be a 2.0 mm hex screw that you will need to remove. Just unscrew them then you should be able to slide the rear wheels off the drive shafts.

Point here Is you should remove the upper half of the tank from the lower and put the upper in a safe spot. Once you have the drive wheels off you will need to unplug the motors, then there are 3 screws holding the gearbox to the lower. Get a start screwdriver and remove those 3 screws and you can walk the gearbox out of the lower.
As for replacements I would suggest these http://shop.immortalhobbies.com/Gear...101210602A.htm
or a set of the Steel gears which will be loaded this evening, the steel gears are $69.00 a set and are a 3 to 1 ratio. For bigger tanks like the KV-1 you can't go wrong with the steel set up regardless of how you run.

NM190

Great advice! Thanks!
But there's a plastic profile in the way, that blocks the sprocket wheel from coming off. Looks kinda like the letter "L", it's function on the real ones probably were to stop snow and mud from building up between the two sprocket wheels on one side.
To me it looks as if i have to break it to get it off.

You can see it in this pic.

Airbrushler

yes those little scrapper parts should come off you can see one the inside where they clip on if you break them no big deal unless you really want to put them back on if you do i have a few here you can have let me know i never put mine back on

Strato50

You can often manage to wiggle the sprocket around the scraper without much difficulty, just be careful and patient.

It might even help to unscrew the gearbox from the tank floor BEFORE attempting to remove the drive sprocket. That way you can give it a little bit more room to wiggle around. It's tricky but do-able.

The metal wheels split in 2 halves and might be easier.

If you're running a STOCK plastic KV-1, remember you need LONG SHAFT gearboxes if you're going to use the same plastic drive sprockets.

NM190

Thanks for all the advice! Are there gearboxes made from stronger metal than brass on the market? The brass ones seem to wear out real fast when my retard friends try to neutral-turn in an incline...
And also, i'm running this tank together with my 4 year old son. And although he's brought up more or less the right way, his friends aren't, so theres always parts missing when we get back home. Where to buy spares? (Pref. metal parts.)