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SERVICE INSTRUCTIONS FOR
3M™ 12,000 RPM 5 in. (127 mm)
RANDOM ORBITAL SANDERS
The part number 20347, 3M™ Overhaul Service Kit, contains all the replacement parts that naturally
wear over time and a straightforward manual to make servicing a 3M™ sander simple. Overhauling the
Random Orbital Sander can be made even easier with the use of the above Service Tools. The Service
Tools also reduce the chance of improper assembly.
Part Number
3MA0040
3MA0021
3MB0005
3MA0010
3MA0041
3MA0042
3MA0019
3MA0938
3MA0039
3MA0062
3MA0068
3MA0007
3MA0009
3MA0014
3MA0043
3MA0008
3MA0166
3MA0016
3MA1417
34-8700-5191-8
and 6 in. (150 mm)
3M™ Overhaul Service Kit
EXTERNAL RETAINING RING
BEARING - 2 SHIELDS
ROTOR
VANE
WOODRUFF KEY
O-RING
BEARING - 2 SHIELDS
DOUBLE ROW ANGULAR CONTACT BEARING - 1 SEAL
INTERNAL RETAINING RING
INTERNAL MUFFLER
MUFFLER INSERT
VALVE
VALVE SEAT
VALVE SPRING
O-RING
VALVE STEM ASSEMBLY
MUFFLER HOUSING
SPACER
INSTRUCTIONS FOR 5 in. AND 6 in. ROS OVERHAUL SERVICE KIT
Description
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Revision 10/03/07
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Summary of Contents for 3M RANDOM ORBITAL SANDERS
- Page 1 SERVICE INSTRUCTIONS FOR 3M™ 12,000 RPM 5 in. (127 mm) and 6 in. (150 mm) RANDOM ORBITAL SANDERS 3M™ Overhaul Service Kit The part number 20347, 3M™ Overhaul Service Kit, contains all the replacement parts that naturally wear over time and a straightforward manual to make servicing a 3M™ sander simple. Overhauling the Random Orbital Sander can be made even easier with the use of the above Service Tools. The Service Tools also reduce the chance of improper assembly. Part Number Description 3MA0040 EXTERNAL RETAINING RING 3MA0021 BEARING - 2 SHIELDS 3MB0005 ROTOR 3MA0010 VANE 3MA0041 WOODRUFF KEY 3MA0042 O-RING 3MA0019 BEARING - 2 SHIELDS 3MA0938...
- Page 2 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 Procedure for removal of the Bearings from the Shaft Changing Grips: Balancer: 1. The Grip has two “tabs” that wrap around the body of A. Position the Set Screw in the top of the T-9 12 mm ID the sander under the inlet and exhaust. Use a small Bearing Puller. screwdriver to pick out one of the “tabs” of the Grip, B. Make sure the Retaining Ring is removed, then press and then continue to go underneath the Grip with the the Bearing Puller into the I.D. of Bearing until the Bear- screwdriver and pry the Grip off of sander. To install a ing Puller hits the bottom of the Shaft Balancer. new Grip, hold the Grip by the tabs making them face C. Thread the Set Screw down until it hits the bottom of the outward, align the Grip and slide it under the Throttle Shaft Balancer or becomes very tight. Grip the shaft end Lever then press the Grip down until it seats onto the of the Shaft Balancer in a padded vise. top of the sander. Make sure the two “tabs” seat under D. Screw the threaded end of the T-6 Motor Lock Ring the inlet and exhaust.
- Page 3 Slide the inlet end of the Ø 1 in. (28 Control. Install Valve Stem, O-ring (cleaned and lightly mm) CV Swivel Exhaust Assembly or the Ø 3/4 in. (19 greased) and insert the Speed control into the Hous- mm) CV Swivel Exhaust Assembly into the exhaust port ing in the midway position. Install the Retaining Ring. of the Shroud or Clean Sanding Shroud until it hits the CAUTION: Make sure the Retaining Ring is completely stop on the Swivel Exhaust Assembly. snapped into groove in the Housing. NOTE: For installation of Shrouds and Skirts make sure the 3. Install the Valve Seat, the Valve and the Valve Spring. line up slots (on the Housing) and tabs (on the Shroud or Coat the threads of the Bushing Assembly with 1 or 2 Skirt) are engaged. Make sure that the key on the Swivel drops of 3M Rite-Loc TL22 or equivalent non-permanent Exhaust Assembly bracket is aligned and engaged with the pipe thread sealant. Screw the assembly into the Hous- keyway on the Housing. ing. Torque to 60 in/lbs (6.77 Nm.) B) Place the Washer over the Screw. Thread the screw T-1B Bearing Press Tool Top Shim Washer Press Tool Base T-1A 34-8700-5191-8 Revision 10/03/07...
- Page 4 Place the Valve into the bore so it is oriented correctly, sure the Spring Pin engages the pocket in Housing. then press the Retainer into the bore until it is flush with 8. Carefully screw the Lock Ring into the Housing with the the bottom of the Bearing bore. T-6 Motor Lock Ring Wrench/Spindle Puller Tool. Torque 5. Apply a pin head size drop of 3M Rite-Loc TL71 or to 60 in/lbs (6.77 Nm.) NOTE: A simple technique equivalent to the outside diameter of each of the bear- to assure first thread engagement is to turn the lock ings on the spindle assembly. Spread the drop of bear- ring counter clockwise with the T-6 Motor Lock Ring ing locker around the bearing until distributed evenly. Wrench/Spindle Puller while applying light pressure. You...
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Page 5: Troubleshooting Guide
Troubleshooting Guide Symptom Possible Cause Solution Check air line pressure at the Inlet of Insufficient Air Pressure the Sander while the tool is running at free speed. It must be 90 psig (6.2 Bar). See the “Housing Disassembly” section for Muffler removal. The Muffler can be back flushed with a clean, suitable cleaning solution until all contaminates Clogged Muffler(s) and obstructions have been removed. If the Muffler can not be properly cleaned then replace it. Replace Muffler Insert (See the “Housing Assembly” Section).
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