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The Yaesu G600 / G600RC Aerial Rotators are Identical to the Kenpro KR600 Rotators
The Unit described below belongs to The Bristol Contest Group and was behaving very oddly
before its service. Our Rotator was found to have rusty ball bearings and a faulty positioning Pot. The ball bearings and their tracks were cleaned with white spirit and re-packed with Castrol LM grease. The grease will also hold all the balls in place during assembly so use loads of it ! The wirewound positioning pot should measure 500 Ohms. Set it to mid position with an ohmmeter for final assembly, then re-assemble the rotator with the bar that operates the limit switches at 180 degrees to the lug on the casing that it stops against. You can make any other adjustments by moving the pointer on the control box. With the pot set half way (250 Ohms) the pointer should be set to South. The pot on the rear of the control box is used to set the range of pointer to match the rotator and is not for making fine adjustments to the position.To calibrate - run the rotator fully counter clockwise until it stops (set the pointer to North if required) then turn it clockwise until stops it and adjust the pot at the rear to indicate North and it should be calibrated.

The pictures below show our rotator during its service

The information here are my own discoveries made from dismantling a G600-RC rotator and should be used with caution and may indeed be bad advice and incorrect. be warned.