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Repair Center  How to Replace the Spindle Gear 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: About 30 minutes Frequency: As necessary Tools Required: Phillip's screwdriver, pick, bearing separator, bench vise, hammer, punch, socket set, snap-ring pliers Part #: 227505-7

How to Replace the Spindle Gear on a Makita Grinder

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

Gears grinding on your nerves? 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 spindle gear attaches to the spindle on your grinder. It mates to the drive gear on the end of the armature. Its job is to transfer the direction of rotation from the armature to the spindle.

Like any gear, the spindle gear will eventually wear out. Symptoms of a worn-out spindle gear include lack of rotation at the spindle, loss of performance, or unusual "grinding" noises coming from the gear housing. With hard use of the grinder, the spindle gear will wear out much more quickly.

This article provides step-by-step instructions for removing and installing the spindle gear on a Makita grinder.

Let's get started. The Fix   REMOVING THE SPINDLE GEAR [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 bearing box from the gear housing.

Remove the (4) screws from the bearing box.

Remove the screws

 

 

Separate the bearing box from the gear housing.

Remove the bearing box

 

 

  5. Remove the upper spindle bearing.

Position the bearing separator around the rear bearing.

Position the Separator

 

 

Tighten the bearing separator bolts.

Tighten the bolts

 

 

Place the bearing separator (and spindle assembly) on the vise. The jaws of the vise should be opened wide enough to accommodate the spindle assembly (without touching it).

Place in vise

 

 

Use a punch and a hammer to tap the end of the spindle shaft until the bearing breaks free from the spindle.

Use a punch and hammer

 

 

Remove the upper spindle bearing from the assembly.

Remove the bearing

 

 

  6. Remove the spindle gear.

Use retaining-ring pliers to remove the retaining ring from the spindle shaft.

Remove the snap-ring

 

 

Remove the wave washer from the spindle shaft.

Remove the wave washer

 

 

Slide the spindle gear away from the spindle shaft.

Remove the gear

 

 

Remove the spindle “key” from the spindle shaft. (The key is very small, and may fall out of the spindle shaft on its own when the gear is removed.)

Remove the key

 

 

  INSTALLING THE NEW SPINDLE GEAR [top] 7. Install the spindle gear.

Install the spindle key into the spindle shaft. (The rounded portion should face the spindle).

Install the key

 

 

Partially install the new spindle gear onto the shaft.

Install the gear

 

 

Align the keyway (on the spindle gear) with the key (on the shaft) and slide the gear the rest of the way onto the shaft.

Align the key

 

 

Install the wave washer onto the spindle shaft.

Install the wave washer

 

 

Secure the spindle gear with the retaining-ring.

Install the snap ring

 

 

  REASSEMBLING THE UNIT [top] 8. Reinstall the upper spindle bearing.

Slide the upper spindle bearing onto the spindle shaft.

Install the bearing

 

 

Locate a socket that has the same diameter as the inner race of the bearing.

Locate a socket

 

 

Position the socket squarely against the bearing.

Position the socket

 

 

Tap the socket with a hammer to press the bearing on the spindle shaft.

Tap the socket

 

 

Continue tapping the socket until the bearing is fully seated on the spindle.

Tap until seated

 

 

  9. Reinstall the bearing box onto the gear housing.

Install the bearing box onto the new gear housing.

Install the bearing box

 

 

Secure the bearing box with the (4) screws.

Secure the bearing box

 

 

  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).

Install the gear housing

 

 

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

Secure the gear housing

 

    11. 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

 

 

  12. 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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