UNIMOG OWNERS !!!
A word of warning to anyone with a cascade gearbox be it in a 421 or 406 NEVER leave the cascade lever in neutral with the engine running, there is a grub screw that can work loose not a problem if it is in gear but when in the neutral position this screw can vibrate lose and jam the lever in the neutral position.
It's a engine out and gear box strip! Also never leave your main gearbox in gear you will weaken the synchromesh springs !! Fix your handbrake

Moose