I purchased all the gears for this Kitchenaid pro 600 mixer a week or so ago. The worm gear follower was stripped and the main gear was also. I changed them as well as the bevel gear and put new grease in. It's a pretty easy repair and everything fit together well. WHen I turned the mixer on again there was a farily loud knocking noise. took it apart again and was able to spin the motor by hand and everything turns smoothly. when I turn the power on to the motor I could see that the worm gear was jumping off the drive gear on the motor. There seems to be a lot of play that the whole worm gear can move in it's cradle. With the motor running (I was very careful) I could make the knocking stop by shifting the worm gear a little in its cradle by moving the front and rear bearings. I have ordered replacement front and rear bearings but the ones there look perfect with no signs of damage. Any ideas???
ANSWER Hello Don. Based on the information you provided, it sounds like the bearings are bad and will need to be replaced in the unit. If there is enough play to shift the bearings, they are bad.
Answered by AppliancePartsPros.com | Wednesday, December 12, 2012