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Lock nut on Makita GA4030 is stuck.

Lock nut stuck

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  • Makita Master
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Because the locknut on grinders are threaded to be self tightening, they can get lodged on quite tight. If it's stuck that bad, put the body of the grinder snuggly in a vice but don't crack the casing. Make sure the arbor lock is seated well and put all the pressure you can on the locknut wrench you can muster. If it still won't come loose, squirt some liquid wrench on the arbor-locknut gap and let it soak in.

Posted on Mar 08, 2012

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At the top of the Makita grinder you will see a Black button. The button is pushed down to keep the grinding wheel from spinning. Holds the grinding wheel in place, as you turn the lock nut loose. When you release the button, a spring inside pushes the button back up out of the way.

As you view the Makita grinder, Release Button towards the Back, grinding wheel towards you, the nut is turned to the LEFT, to loosen. It is a Left threaded nut.

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