Taken from
http://www.bborgan.com/helpfultips/beforeyoumoveyourhammond.htmBefore you move your Hammond OrganAlways, always make sure the Tone Generator is locked down before you move a Hammond Organ. When unlocked, the tone generator is suspended on springs in order to reduce the amount of noise emitted by the generator. If you move the organ with the tone generator unlocked, it will bounce around, which can result in broken wires. Even worse, it could bang against other parts of the organ and the pickup rods can get bumped or bent. If a pickup bar gets pushed far enough into the tone generator, it could hit a tone wheel and keep that tone wheel assembly from spinning. It can also result in a permanently damaged tone wheel.
How to lock down the tone generator.
There are four bolts with T-shaped spacer and washer assemblies which bolt the tone generator to the shelf. Locking the generator is as easy as unscrewing the bolts, and flipping the spacer/washer assemblies over (see illustration below.)

Use a 5/16" nut-driver to tighten the bolts, as they have a tendency to work loose in transit.
Instead of the T-shaped spacer and washer assembly, some older organs have captive screws with large washers. Simply tighten the screws to lock-down the generator. To unlock the generator, simply unscrew them as far as they'll go.
Notes
Running your organ with the tone generator locked down won't damage anything, the organ will just be a little noisier. Many people never unlock their generators. Those people that move your organ on a regular basis should periodically check to make sure that the lockdown assemblies have not worked loose. If the organ is going to remain in one place, you'll probably want to unlock the generator.
If one or more tone generator lockdown spacer and washer assemblies are missing and you want to move the organ, they are available new.