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  How to Replace the Switch Button on a Makita Grinder

Why Read This Article?

Finish Nailer Repair - Replacing the Driver Guide (Ridgid Part # 79004001022)

Article Breakdown

Finish Nailer Repair - Replacing the Driver Guide (Ridgid Part # 79004001022)

Video

Tools & Materials

Fix Factor: Easy Duration: 20 minutes Frequency: As necessary Tools Required: Phillip's screwdriver, pick, long-nosed pliers Part #: 419566-3

How to Replace the Switch Button on a Makita Grinder

Finish Nailer Repair - Replacing the Driver Guide (Ridgid Part # 79004001022)
Replacing the switch button on a Makita grinder The Facts

Glitch in your grinder switch? It's time to face the fix. Whether you are a master mechanic or a garage-based grinder, eReplacementParts.com provides the parts, procedures and facts you need to fearlessly fix what fails you.

The switch button is the part you use to turn the grinder on and off. It attaches to an internal actuating lever that runs all the way to the back of the grinder to the (electrical) switch. With heavy use, it's not uncommon for the switch button to break off the grinder (especially the hooked portion on the bottom of the button).

Impacts (such as dropping the grinder) can also break the switch button. This article provides step-by-step instructions for removing and installing the switch button on a Makita grinder.

Let's get started. The Fix   REMOVING THE SWITCH BUTTON [top] 1. Remove the side handle.

Unscrew and remove the side handle from the grinder.

Remove the side handle

 

 

  2. Remove the guard.

Loosen the lock-screw on the guard assembly.

Loosen the screw

 

 

Rotate the guard assembly to disengage it from the housing.

Rotate the guard

 

 

Remove the guard from the grinder.

Remove the guard

 

 

  3. Remove the gear housing.

Remove the (4) screws from the gear housing.

Remove the screws

 

 

Separate the gear housing from the motor housing.

Separate the housing

 

 

  4. Remove the rear cover.

Remove the (1) screw from the rear cover.

Remove the screw

 

 

Slide the rear cover away from the motor housing.

Remove the cover

 

 

  5. Disengage the motor brushes.

Use a pick to (gently) lift the brush spring from the back of the carbon motor brush.

Lift the spring

 

 

Reposition the brush spring alongside the motor brush (against the brush holder).

Move the spring

 

 

Pull (gently) on the wire lead to disengage the motor brush from the armature.

Lift the brush gently

 

 

Repeat this step to disengage the second motor brush.

Repeat

 

 

  6. Remove the armature assembly.

Slide the armature assembly (which is attached to the gear housing cover) out of the motor housing.

Remove the armature

 

 

  7. Remove the baffle plate.

Remove the (2) screws from the baffle plate.

Remove the screws

 

 

Slide the baffle plate out of the motor housing.

Remove the baffle plate

 

 

  8. Remove the switch button.

Press and hold the switch button in the “off” position (toward the rear of the grinder).

Slide the button

 

 

Press the switch lever toward the front of the grinder (toward the switch button) until it "clicks" and disengages the switch button.

Press the lever

 

 

Remove the switch button from the grinder.

Remove the switch button

 

 

  INSTALLING THE NEW SWITCH BUTTON [top] 9. Install the switch button.

Press and hold the switch lever (from the rear of the grinder) all the way forward (toward the front of the grinder).

Press the lever

 

 

Pass the hook on the new switch button through the opening on the motor housing.

the hook

 

 

Press the switch lever onto the hook on the switch button (from inside the grinder).

Engage the hook

 

 

Release the switch lever (from the rear of the grinder) to engage the hook and secure the switch button.

Release the lever

 

 

  REASSEMBLING THE UNIT [top] 10. Reinstall the baffle plate.

Install the baffle plate into the motor housing and align the mounting holes.

Install the baffle plate

 

 

Secure the baffle plate with the (2) screws.

Secure the baffle plate

 

 

  11. Reinstall the armature assembly into the motor housing.

Slide the armature assembly into the motor housing.

Install the armature

 

 

Align the gear housing cover with the motor housing.

Align the housing

 

 

  12. Reinstall the gear housing.

Install the gear housing onto the grinder (aligning the mounting holes with the gear housing cover and the motor housing).

Install the gear housing

 

 

Secure the gear housing to the grinder with the (4) screws.

Secure the gear housing

 

 

  13. Re-engage the motor brushes.

Use a pick to (gently) lift the brush spring away from the brush holder.

Lift the spring

 

 

Position the brush spring against the motor brush.

Position the spring

 

 

Repeat this step to engage the second motor brush.

Repeat

 

 

  14. Reinstall the rear cover.

Visually inspect the wires for potential “pinch-points” and adjust/tuck the wires as necessary.

Inspect the wires

 

 

Slide the rear cover onto the motor housing.

Install the rear cover

 

 

Secure the rear cover with the screw.

Secure the rear cover

 

 

  15. Reinstall the guard.

Install the guard assembly onto the grinder.

Install the guard

 

 

Rotate the guard assembly to engage the mounting plate.

Rotate the guard

 

 

Secure the guard with the (1) screw.

Secure the guard

 

 

  16. Reinstall the side handle.

Install the side handle onto the grinder.

Install the side handle

 

 

Tighten the side handle until secure.

Secure the handle The Finish

You can't place a value on a job well done, unless you did it yourself. (Which you did.) Now you can place that value back into your own pocket. (Or into your business.) Not only did you refine your grinder at a fraction of the cost of replacement; you have expanded your skills far beyond the daily grind.

Find your next grind here.   [top]

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