how can you remove the idler wheel?
Well, there are two versions of the idler wheel.
1. Version: screwed wheel

2. Version: Plugged wheel (sometimes this version is screwed to, so follow the next steps anyway)

How to remove them?
1. Remove the Tiger tracks
http://www.rctankwarfare.co.uk/forums/v ... 18&t=11460
Lay the Tiger on its back.
The idler wheels consist of two halves glued together.

So first you need to separate the outer half from the inner one.
Use a small screwdriver to do so.

Now you can see if it is screwed or plugged.

This one just needs to be unscrewed.

If you have the plugged version, you see the axis.
How to remove this one? See following pictures.




Reassembling works the other way round.
Greetings
Birger
For a lot more help with your Heng Long Tiger I tank, follow the below link ...
http://www.rctankwarfare.co.uk/forums/v ... 18&t=11459