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)
Tools & Materials
Rubber ring ruined? 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 rubber ring attaches to the rear bearing on the armature. Its purpose is to cushion and space the bearing within the motor housing. The most common problem encountered with the rubber ring is that the rear bearing seizes onto the armature and spins inside the ring, quickly melting and destroying the rubber component.
This article will show you how to remove and install the rubber ring on Makita grinder.
Let's get started. REMOVING THE RUBBER RING [top] 1. Remove the side handle.
Unscrew and remove the side handle from the grinder.
2. Remove the guard.
Loosen the lock-screw on the guard assembly.
Rotate the guard assembly to disengage it from the housing.
Remove the guard from the grinder.
3. Remove the gear housing.
Remove the (4) screws from the gear housing.
Separate the gear housing from the motor housing.
4. Remove the rear cover.
Remove the (1) screw from the rear cover.
Slide the rear cover away from the motor housing.
5. Disengage the motor brushes.
Use a pick to (gently) lift the brush spring from the back of the carbon motor brush.
Reposition the brush spring alongside the motor brush (against the brush holder).
Pull (gently) on the wire lead to disengage the motor brush from the armature.
Repeat this step to disengage the second motor brush.
6. Remove the armature assembly.
Slide the armature assembly (which is attached to the gear housing cover) out of the motor housing.
7. Remove the rubber ring.
Remove the rubber ring from the rear bearing.
INSTALLING THE NEW RUBBER RING [top] 8. Install the rubber ring.
Slide the new rubber ring onto the rear bearing.
REASSEMBLING THE UNIT [top] 9. Reinstall the armature assembly into the motor housing.
Slide the armature assembly into the motor housing.
Align the gear housing cover with the motor housing.
10. Reinstall the gear housing.
Install the gear housing onto the grinder (aligning the mounting holes with the gear housing cover and the motor housing).
Secure the gear housing to the grinder with the (4) screws.
11. Re-engage the motor brushes.
Use a pick to (gently) lift the brush spring away from the brush holder.
Position the brush spring against the motor brush.
Repeat this step to engage the second motor brush.
12. Reinstall the rear cover.
Visually inspect the wires for potential pinch-points and adjust/tuck the wires as necessary.
Slide the rear cover onto the motor housing.
Secure the rear cover with the screw.
13. Reinstall the guard.
Install the guard assembly onto the grinder.
Rotate the guard assembly to engage the mounting plate.
Secure the guard with the (1) screw.
14. Reinstall the side handle.
Install the side handle onto the grinder.
Tighten the side handle until secure.
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.