Question about Makita 7" Electronic Sander - Polisher 9227CX3

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Speed varies on its own

No what speed it indicates on the rpm knob the speed varies from high to low on its own

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You must replace the speed control module. Any Makita service certer can supply you with the proper parts.

Posted on Apr 15, 2009

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Posted on Jan 02, 2017

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Unit just shuts down, wait a bit, then works again, repeat process.

These units come with a Thermal Overload Protection device. It is not a timer, but when the temp. gets higher than normal, it shuts down to prevent damage to the motor. If the brush is dragging (full force) on the floor it will slow down the operation and heat up the motor. If the shaft has collected twine, rope, string, etc. it can slow down also. Clean the underside after each use.

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I would start at the service outlet for its amp rating. This machine upon startup draws more. I can't see magnets getting weak, are they broken causing a drag on the rotor. I would suggest running this tool NO LOAD and see what the readings are. Also would check the bearings for resistance causing the high amp draw.

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Typical speed question

It spins typically from 600-3000 RPMs. This single motion allows a circular polisher to level the clear coat that surrounds a scratch so that the scratch’s “edges” disappear. Professionals who want to completely remove a deep scratch must use a circular polisher.

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1 Answer

Variable speed Control problem

When you are finishing the surface, it's vital to maintain control. Work too fast or too slow and you risk ruining your hard work with unsightly scratches

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