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Mike,
I think you'll find all the bearings on the RA axis turn during tracking and two on the Dec axis are stationary when the dec clutch is locked.
The noise you are hearing is most likely coming from the transfer gear between the motor gear and the spur gear. You will probably find this is too loose and needs the retaining bolt tightened up a bit.
If you are intending to lubricate the main bearings you will probably need to remove them from the mount to clean them out and there is a good chance you will damage the bearing seals when you try to remove them.
You can use PERECORDER to measure the PE. Have a look on the EQMOD/EQ6 yahoo group.
Pete.
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