Select your animated object, go to 'character' > 'create character set', name it what ever, then in the Trax editor, got to 'create' > 'animation clip', name it what ever, then it will show in your trax editor, u might have to go to 'list' > 'load character set', then you can select the animation, and go to 'edit' > 'duplicate' in the trax editor as many times as u need.

Another way could be to grab the keyframes and select them all inthegraph editor and go to 'post infinity' > 'cycle'.

Or third n finally, if your after just a rotating piece for a clock you can wirte an expression like this...

pCylinder1.rotateZ = frame;

as long as u change the pivot point to be at the bottom of the object (in this case a cylinder), and it will spin round, just add a mulitplier like...

frame * 4;

to the end to speed up/slow down.

Hope one of em helps
Chris