help with rigging a vehicle

Hi! I have a little problem with vehicle rig. I have set-up the bones as I saw on other vehicles, but when I move the suspension bone, the entire vehicle moves and I cant create suspension animation because of that.
Preview:

Bone hierarchy:
http://www.shrani.si/f/2k/58/2WMRVxRb/scheme.png

Master Chris says it might be some setting in 3ds max. Please, if anyone knows what the problem might be, help.

Thanks!

Just for the record if anyone has similar problem in the future and finds this thread: I unlinked the suspension and axle bones from frame bone and animated them this way. I dont know if there are any side effects of these bones not being linked to frame bone, but in-game I havent spotted any (yet). If anyone who rigs vehicles in 3ds max comes by please show the correct way of doing this. Thanks.