Difficulty

Moderate

Steps

8

Time Required

                          30 - 40 minutes

Sections

2

  • Disk Cover
  • 4 steps
  • Grease
  • 4 steps

Flags

1

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Introduction

What you need

Step 1

              Disk Cover
  • Check for the provided lock nut wrench. This is used for loosening the piece that keeps the disk and cover attached.

Check for the provided lock nut wrench. This is used for loosening the piece that keeps the disk and cover attached.

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Step 2

  • Unscrew the handle unit until it is removed completely.

Unscrew the handle unit until it is removed completely.

Step 3

  • Hold the black switch located on the front casing.
  • Still holding the switch, use the lock nut wrench to loosen the silver disk holding everything in place.
  • Once loose, remove the silver disk and/or your grinding disk.

Hold the black switch located on the front casing.

Still holding the switch, use the lock nut wrench to loosen the silver disk holding everything in place.

Once loose, remove the silver disk and/or your grinding disk.

Step 4

  • Use a Phillips #02 screwdriver to remove the 15 mm pan head screw that holds the cover in place.
  • Remove the cover by lining up the knob on the cover with the notch in face plate.

Use a Phillips #02 screwdriver to remove the 15 mm pan head screw that holds the cover in place.

Remove the cover by lining up the knob on the cover with the notch in face plate.

Step 5

              Grease
  • Unscrew the four 15 mm pan head screws using a Phillips #02 screwdriver.

Unscrew the four 15 mm pan head screws using a Phillips #02 screwdriver.

Step 6

  • Remove the face of the device. You may need to jiggle it a little to get it off.
  • Once you see the grease, it should appear to be speckled with either dirt particles, fragments of metal, or look dark and lumpy. If you grease does not look like this, then you do not need to replace it.

Remove the face of the device. You may need to jiggle it a little to get it off.

Once you see the grease, it should appear to be speckled with either dirt particles, fragments of metal, or look dark and lumpy. If you grease does not look like this, then you do not need to replace it.

Step 7

  • Use a metal spudger to scrape the old grease from the cavity.

Use a metal spudger to scrape the old grease from the cavity.

Step 8

  • Blow compressed air into the device to make sure it is completely clean.
  • Squeeze in enough grease to fill the indents inside of the cavity.
  • Use a metal spudger to spread the grease evenly across the face of the device.

Blow compressed air into the device to make sure it is completely clean.

Squeeze in enough grease to fill the indents inside of the cavity.

Use a metal spudger to spread the grease evenly across the face of the device.

To reassemble your device, follow these instructions in reverse order.

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Author

                                      with 4 other contributors 


                    Laura Ann Jagels

Member since: 04/01/2015

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Team

                       Cal Poly, Team 12-5, Lancaster Spring 2015                        

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                                            13 Guides authored

Robert Chua - Oct 4, 2016

Reply

Hi, what is the recommended grease?

William Diffin - May 24, 2018

Reply

Hi. You’re great.

Dan Faerber - Dec 31, 2018

Reply

Can I use white lithium grease. Thanks my brushes appear to about half an inch long if the grease doesn’t work going to try them????

Emilio Gonzalez - Aug 22, 2019

Reply

Angle grinders use a PAO lithium soap grease. Most use Nye Lubricants RheoLube 380, which is hard to source or expensive to buy.

You may substitute with Dupont Molykote G4700 grease. ereplacementParts.com has the Nye grease.

Drew - Apr 6, 2021

Reply

Hi, I’m trying to replace the spindle of my ga4030 with the one from the ga4530, to effectively make it into a 4-1/2” model. Looking at the parts list for both of these grinders, it appears they are identical except for the spindle, disc retaining nuts, and wheel shroud/guard. Do you know if this mod is possible? It looks like I would just need to remove that small bearing that’s pressed on to the top of the spindle.