How to Change the Brushes in a Hitachi Grinder G12SR3

Grinding and filing is a job that can be extremely difficult with a hand file. That's why electric grinders are an invaluable tool to have in the metal shop. Hitachi manufactures several styles of electric grinders, such as the G12SR. The G12SR is an older model but is comparable to the newer G18MR and G23MR models. Hitachi grinders use a rotary disc to grind down metal ends. The carbon brushes inside the Hitachi help to provide some friction of the grinder's motor. Worn brushes inside the grinder can cause damage to the motor.

Things You'll Need

• Screwdriver
• Replacement carbon brush

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Instructions

1. • 1

     Use a screwdriver to remove the self-tapping screw on the brush cover, and then pull off the brush cover.

   • 2

     Pull the edge of the spring holding the carbon brush in place with the screwdriver tip.

   • 3

     Grasp the end of the carbon brush and slide it out of the carbon brush holder. Slide the replacement carbon brush into place.

   • 4

     Insert the new brush into the carbon brush holder with the "pig tail" end facing the terminal section. Slip the edge of the spring back onto the carbon brush's head.

   • 5

     Close the brush cover, insert the retaining screw and tighten it with a screwdriver