Well, I can only suggest that something didn't go back together correctly. Does it actually agitate and spin or is the motor just humming? Any time you remove the gearcase, before re-installing it, you must make sure the basket drive is fully seated because pulling the gearcase out can cause the basket drive to come out a little bit. You must grab the brake cam driver, turn it CCW while pushing the drive to make sure the drive and brakes are fully seated into the brake hub. Then when installing the gearcase, make sure the spring on the clutch band is exactly opposite the spring up in the brake hub. This ensures that the clutch spring doesn't get jammed up against the tab of the brake cam driver. Make sure the gearcase is fully up against the mounting tubes before replacing the bolts.

Eric