3M AT-DIS7_PROHD manual Changing Grips, Motor Disassembly, Shaft Balancer and Spindle Disassembly

12,000 RPM – 5 in. (127 mm) and 6 in. (150 mm)

RANDOM ORBITAL SANDERS SERVICE INSTRUCTIONS

NOTICE: To receive any expressed or implied warranty, the tool must be repaired by an authorized Service Center.

The 5 in (127 mm.) and 6 in. (150 mm) Random Orbital Sander Service Instructions section provided is for use after completion of the warranty period.

DISASSEMBLY INSTRUCTIONS

Changing Grips:

1.The Grip has two “tabs” that wrap around the body of the sander under the inlet and exhaust. Use a small screwdriver to pick out one of the “tabs” of the Grip, and then continue to go underneath the Grip with the screwdriver and pry the Grip off of sander. To install a new Grip, hold the Grip by the tabs making them face outward, align the Grip and slide it under the Throttle Lever then press the Grip down until it seats onto the top of the sander. Make sure the two “tabs” seat under the inlet and exhaust.

Motor Disassembly:

1.Lightly secure the tool in a vise using the T-7 Soft Collar or padded jaw vice and remove the pad with the 24 mm Pad Wrench then remove the Shroud or Skirt (which- ever applies).

2.Remove the Lock Ring with the T-6 Motor Lock Ring Wrench/Spindle Puller Tool. The motor assembly can now be lifted out of the Housing.

3.Secure the motor assembly by clamping the 5 in. or 6 in. (125 or 150 mm) Shaft Balancer in a padded jaw vise and remove the Retaining Ring and the O-Ring from the Cylinder.

4.Remove the Rear Endplate. This may require support- ing the Rear Endplate with a Bearing Separator and lightly pressing the shaft through the Bearing and Rear Endplate. Remove Cylinder and the Vanes and Rotor Set from the shaft of the Shaft Balancer. Remove the Key then press off the Front Endplate (with Bearing), O- Ring and the Lock Ring. It may be necessary to remove the Bearing with a Bearing Separator if it came out of the Front Endplate and stuck to the shaft of the Shaft Balancer.

5.Remove the Bearing(s) from the Endplates by using the T-8 Bearing Removal Tool to press out the Bearings.

Shaft Balancer and Spindle Disassembly:

1.Grip the shaft end of the Shaft Balancer in a padded vise. With a thin screwdriver pick out the slotted end of the Retaining Ring and peel out.

2.Screw the threaded end of the T-6 Motor Lock Ring Wrench/Spindle Puller Tool into the Spindle until hand tight. Apply a gentle heat from a propane torch or hot air gun to the large end of the Balancer Shaft until it is about 212° F (100° C) to soften the adhesive. Do not over heat. Remove the Spindle assembly by using the slider to give sharp outward blows to the Spindle. Allow the parts to cool so they are safe to handle. Follow one of the appropriate directions below:

•If the Bearing come out with the spindle, use a small Bearing Separator to remove it. Move onto step 3.

•If the Bearing stays in the Shaft Balancer. Follow steps A - D below.

Procedure for removal of the Bearings from the Shaft Balancer:

A.Position the Set Screw in the top of the T-9 12 mm ID Bearing Puller.

B.Make sure the Retaining Ring is removed, then press the Bearing Puller into the I.D. of Bearing until the Bear- ing Puller hits the bottom of the Shaft Balancer.

C.Thread the Set Screw down until it hits the bottom of the Shaft Balancer or becomes very tight. Grip the shaft end of the Shaft Balancer in a padded vise.

D.Screw the threaded end of the T-6 Motor Lock Ring Wrench/Spindle Puller Tool into the Bearing Puller until hand tight. Apply a gentle heat from a propane torch or hot air gun to the large end of the Shaft Balancer to re-heat it until it is about 212° F (100° C) to soften the adhesive. Do not over heat. Remove the Bearing by using the slider to give sharp outward blows to the Bear- ing Puller. Allow the Bearing Puller, Bearing and Shaft Balancer to cool. After cooling, unthread the T-6 Motor Lock Ring Wrench/Spindle Puller Tool from the Bearing Puller. Back off the set screw. Secure the Bearing Puller and Bearings in a Bearing Separator and press out the Bearing Puller.

3.The beraing shield components are held in place by the light press fit of the Retainer. These components can be damaged during removal and may need to be replaced if removed. To remove the Retainer, use an O-ring pick or a #8 sheet metal screw to grip and pull out the Retainer. Remove the Valve and Filter from the bore in the Shaft Balancer. If the Retainer and Valve were not damaged, they can be reused. However, the filter should be replaced on re-assembly.

Housing Disassembly:

1.For Non-Vacuum (NV) and Central Vacuum (CV) machines follow the steps outlined in Section I below. For Self Generated Vacuum (SGV) machines follow the steps outlined in Section III.

I.This section is for NV and CV machines.

A)Unscrew the Muffler Housing from the Housing.

B)Remove the Bronze Muffler from the Muffler Housing and remove the Muffler insert from the cavity of the Muf- fler Housing.

C)For NV machines move onto D. For CV machines move onto Section II.

D)Remove the NV Shroud. Move onto Step 2.

II.This section continued from Section I for CV Exhaust machines:

A)Remove the Screw, Washer and Nut.

B)Remove the Ø 1 in. (28 mm) CV Swivel Exhaust As- sembly or the Ø 3/4 in. (19 mm) CV Swivel Exhaust Assembly from the Shroud or Clean Sanding Shroud.

C)Remove the Shroud or Clean Sanding Shroud from the Housing. Move onto step 2.

III. This section is for SGV Exhaust machines:

A) Unscrew the SGV Retainer with an 8 mm hex wrench.

34-8700-5191-8 Revision 10/03/07