3M™ ROS Overhaul Svc Kit Instruction 20346, 3" 77mm, 12000RPM
Contents
1. aS Press Tool Base oe CS Spindle ar T 5A Figure 1 Figure 2 Figure 3 seated in the bearing pocket of the Front Endplate CAU TION Only press just enough to seat the bearing into the pocket Over pressing can damage the bearing 3 Place the Key into the groove on the Shaft Balancer Place the Rotor onto the shaft of the Shaft Balancer making sure that it is a tight slip fit 4 Oil the five Vanes with a quality pneumatic tool oil and place in the slots in the Rotor Place the Cylinder As sembly over the Rotor with the shorter end of the Spring Pin engaging the blind hole in the Front Endplate NOTE The Spring Pin must project 060 in 1 5 mm above the flanged side of the Cylinder 5 Press fit the rear 2 Bearing 2 shields into the Rear Endplate with the T 1B Bearing Press Tool Make sure the T 1B Press Tool is centered on the O D of the outer race Lightly press fit the Rear Endplate and Bearing Assembly over the Shaft Balancer using the small end of the T 13 Bearing Press Sleeve The sleeve should press only the inner race of the bearing IMPORTANT The Rear Endplate and Bearing Assembly is pressed correctly when the Cylinder is squeezed just enough between the Endplates to stop it from moving freely un der its own weight when the shaft is held horizontal but be able to slide between the Endplates with a very light force If pressed t2. N w a Place the T 5A Spindle Bearing Pressing Tool Base onto a flat clean surface of a small hand press or equivalent with the spindle pocket facing upward Place the Spindle into the spindle pocket with the shaft facing upwards See Figures 1 and 2 Place theWasher on the Spindle shaft with the curve of the Washer facing out so that the outside diameter of the Washer will contact the outer diameter of the Bearing one seal Lay the Shim on the shoulder of the Spindle Place the Bearing one seal on the Spindle with the seal side toward the Washer NOTE Make sure that both the inner and outer races of the Bearings are supported by the Bearing Press Tool when pressing them into place Press the Bearing onto the shoulder of Spindle using the T 5B Spindle Bearing Pressing Tool Top as shown in Figure 2 Place the Shim over the Spindle shaft and onto the face of the Bearing making sure it is on center Press the no seals shields Bearing down using the T 5A Spindle Bearing Pressing Tool Top being careful to make sure the Shim is still centered on the vertical axis of the Spindle shaft and Bearing See Figure 3 NOTE When the Spindle Assembly is done correctly the Bearings will rotate freely but not loosely and the Shim can be moved but will not slide or move by gravity Secure the Retaining Ring onto the Spindle Assembly making sure it is completely snapped into the groove Set the Spindle Assembly aside Take t
3. 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 steps A B below unless otherwise noted For Self Generated Vacuum SGV machines disregard steps A E and move onto Step G below A Unscrew the Muffler Housing from the Housing Remove the Bronze Muffler from the Muffler Housing if ap plicable Remove the Muffler from the Muffler Housing For NV machines move onto B For CV machines move onto C B Remove the 3 in 77 mm Non Vacuum Shroud For NV machines move onto step 2 For Central Vacuum CV Exhaust machines C Remove the Screw Washer and Nut D Remove the in 19 mm CV Swivel Exhaust Assem bly Optional or the 1 in 28 mm CV Swivel Exhaust Assembly Standard from the 3 in 77 mm Shroud E Remove the 3 in 77 mm Shroud from the Housing Move onto step 2 For Self Generated Vacuum SGV Exhaust machines F Unscrew the SGV Retainer with an 8 mm hex key G Remove the 1 in 28 mm Hose SGV Swivel Exhaust Assembly Standard or in 19 mm Hose SGV Swivel Exhaust Assembly Optional from the Adapter H Pull the SGV Retainer out of the bore of the Swivel Exhaust Assembly and remove the two O Rings I Remove the 3 in 77 mm Shroud from the Ho
4. machines follow the steps A C For SGV machines follow the steps G J This section is for Central Vacuum CV and Non Vacu um NV machines A Place a clean Muffler all the way into the chamber of the Muffler Housing Press the Bronze Muffler into the bore of the Muffler Housing if applicable B Screw the Muffler Housing assembly into the Housing until hand tight Use a 21 mm socket torque wrench combination to torque the Muffler Housing Torque to 20 in lbs 2 25 Nm For NV machines move onto C For CV machines move onto step D C Install the 3 in 77 mm Non Vacuum Shroud onto the Housing by working the Shroud over and around the bot tom of the Housing flanges Make sure the line up slots on the Housing and tabs on the Shroud are engaged Move onto the Spindle Bearings bearing shield and Shaft Balancer Assembly Section This section continued from Section for Central Vacuum CV Exhaust machines D Install the 3 in 77 mm CV Shroud on to the Housing by working the shroud over and around the bottom of the Housing flanges Make sure the line up slots on the Housing and tabs on the Shroud are engaged E Slide the inlet end of the in 19 mm CV Swivel Exhaust Assembly Optional or the 1 in 28 mm CV Swivel Exhaust Assembly Standard into the exhaust port of the 3 in 77 mm CV Shroud until it hits the stop on the CV Swivel Exhaust Assembly Make sure the key on the CV Swivel Exhaust Assembly bracke
5. the pad 34 8700 5192 6 Revision 10 03 07
6. SERVICE INSTRUCTIONS FOR 3M 12 000 RPM 3 in 77 mm RANDOM ORBITAL SANDERS 3M Overhaul Service Kit The part number 20346 3M Overhaul Service Kit contains all the replacement parts that naturally wear over time and a straightforward manual to make servicing an 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 Qty 3MA0040 EXTERNAL RETAINING RING 1 3MA0021 BEARING 2 SHIELDS 1 3MB0005 ROTOR 1 3MA0010 VANE 5 3MA0041 WOODRUFF KEY 1 3MA0042 O RING 1 3MA0019 BEARING 2 SHIELDS 1 3MA0162 BEARING NO SEAL SHIELDS 1 3MA0196 SPACER 1 3MA0161 BEARING 1 SEAL 1 3MA0039 INTERNAL RETAINING RING 1 3MA0068 MUFFLER INSERT 1 3MA0062 INTERNAL MUFFLER 1 3MA0009 VALVE SEAT 1 3MA0007 VALVE 1 3MA0014 VALVE SPRING 1 3MA0043 O RING 1 3MA0008 VALVE STEM ASSEMBLY 1 3MA0166 MUFFLER HOUSING 1 3MA1416 INSTRUCTIONS FOR 3 in ROS OVERHAUL SERVICE KIT 1 34 8700 5192 6 Revision 10 03 07 12 000 RPM 3 in 77 mm ROS Service Instructions NOTICE To receive any expressed or implied warranty the tool must be repaired by an authorized Service Center The 3 in 77 mm Random Orbital Sander Service Instructions section provided is for use after completion of the warranty
7. ect performance when sanding Revision 10 03 07 Troubleshooting Guide Symptom Possible Cause Solution Low Power and or Low Free Speed Insufficient Air Pressure Check air line pressure at the Inlet of the Sander while the tool is running at free speed It must be 90 psig 6 2 Bar Clogged Muffler s See the Housing Disassembly section for Muffler removal The Muffler can be back flushed with a clean suitable cleaning solution until all contaminates and obstructions have been removed If the Muffler can not be properly cleaned then replace it Replace Muffler Insert See the Housing Assembly Section Plugged Inlet Screen Clean the Inlet Screen with a clean suit able cleaning solution If Screen does not come clean replace it One or more Worn or Broken Vanes Install a complete set of new Vanes all vanes must be replaced for proper operation Coat all vanes with quality pneumatic tool oil See Motor Disassembly and Motor Assembly Internal air leakage in the Motor Housing indicated by higher than normal air con sumption and lower than normal speed Check for proper Motor alignment and Lock Ring engagement Check for damaged O Ring in Lock Ring groove Remove Motor Assembly and Re Install the Motor Assembly See Motor Disas sembly and Motor Assembly Motor Parts Worn Overhaul Motor Contact authorized Service Center Worn or bro
8. he Filter and center it on the small bore that the original filter was in before removal With a small diam eter screwdriver or flat end rod press the Filter into the bore until it is flat in the bottom of the bore Place the Valve into the bore so it is oriented correctly then press the Retainer into the bore until it is flush with the bottom of the bearing bore Apply a pin head size drop of 3M Rite Loc TL71 or equiv alent to the outside diameter of each of the bearings on the Spindle Assembly Spread the drop of bearing locker around both bearings until distributed evenly CAUTION Only a very small amount of bearing locker is needed to prevent rotation of the bearing OD Any excess will make future removal difficult Place the Spindle Assembly into the bore of the Shaft Balancer and secure with the Retaining Ring CAUTION Make sure that the Retaining Ring is completely snapped into the groove in the Shaft Balancer Allow the adhesive to cure Motor Assembly 1 Use the larger end of the T 13 Bearing Press Sleeve to Press the front Bearing with 2 Shields onto the shaft of the Shaft Balancer 2 Slide the Front Endplate with the bearing pocket facing down onto the Motor Shaft Gently press the Front Endplate onto the front Bearing using the larger end of the T 13 Bearing Press Sleeve until the front Bearing is Revision 10 03 07 s T 5B Press Tool Top Shim Washe Bearing iL Te a 1e OO
9. ight press force to push the Shaft Balancer through the bearing 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 Endplate 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 female end of the T 11 5 16 24 to 1 4 20 Adapter into the male end of the Service Wrench Screw the Service Wrench assembly into the Spindle Assembly until hand tight Apply a gentle heat from a propane torch or hot air gun to the large end of the Shaft Balancer 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 3 Remove the Retaining Ring from the Spindle Assembly Use a small Bearing Separator to remove the Bearing Shim Bearing Shim and the Washer from the Spindle Assembly 4 The bearing shield components are held in place by the 34 8700 5192 6 2 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
10. ken Spindle Bearings Replace the worn or broken Bearings See Shaft Balancer and Spindle Disas sembly and Spindle Bearings Bearing Shield and Shaft Balancer Assembly Air leakage through the Speed Control and or Valve Stem Dirty broken or bent Valve Spring Valve or Valve Seat Disassemble inspect and replace worn or damaged parts See Steps 2 and 3 in Housing Disassembly and Steps 2 and 3 in Housing Assembly Vibration Rough Operation Incorrect Pad Only use Pad Sizes and Weights de signed for the machine Addition of interface pad or other material Only use abrasive and or interface designed for the machine Do not attach anything to the Sanders Pad face that was not specifically designed to be used with the Pad and Sander Improper lubrication or buildup of foreign debris Disassemble the Sander and clean in a suitable cleaning solution Assemble the Sander See Service Manual Worn or broken Rear or Front Motor Bearing s Replace the worn or broken Bearings See Motor Disassembly and Motor Assembly For vacuum machines it is possible to have too much vacuum while sanding on a flat surface causing the pad to stick to the sanding surface For SGV machines add extra washer s to the pad spindle to increase the gap between the pad and shroud For CV machines reduce vacuum through the vacuum system and or add extra washer s to
11. o tightly the motor will not run freely If the pressed assembly is to loose the motor will not turn freely after assembly in the Housing 6 Secure the assembly by placing the Retaining Ring in the groove of the Shaft Balancer CAUTION The Retaining Ring must be placed so that the middle and two ends of the hoop touch the Bearing first Both raised center por tions must be securely snapped into the groove in the Shaft Balancer by pushing on the curved portions with a small screwdriver 7 Carefully screw the Lock Ring into the Housing using the 34 8700 5192 6 4 T 6 Motor Lock Ring Wrench Torque to 60 in Ibs 6 77 Nm NOTE A simple technique to assure first thread engagement is to turn the lock ring counter clockwise with the service tool while applying light pressure You will hear and feel a click when the lead thread of the lock ring drops into the lead thread of the housing then turn clockwise to tighten 8 Spin on a new Pad and hand tighten it using a 17 mm Pad Wrench Testing Place 3 drops of quality pneumatic air tool oil directly into the motor inlet and connect to a 90 psig 6 2 bar air supply The tool should run between 11 500 and 12 000 RPM for 12 000 RPM machines when the air pressure is 90 psig 6 2 bar at the inlet of the tool while the tool is running at free speed This free speed will be about 500 RPM to 1 000 RPM less when a Vacuum or Hook Face Pad is used because of wind resistance This will not aff
12. 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 screw driver to pick out one of the tabs of the Grip then con tinue to go underneath the Grip with the screwdriver and pry the Grip off the 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 Service Col lar or padded jaws Use a 17 mm Pad Wrench to secure the Spindle and spin the Pad counter clock wise off the spindle 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 Remove the O Ring from the Lock Ring 3 Secure the motor assembly by clamping the Shaft Balancer in a padded jaw vise and remove the Retaining Ring from the end of the Shaft Balancer and the O ring from the Cylinder 4 Remove the Rear Endplate This may require support ing the Rear Endplate with a bearing separator Use a light press force to push the Shaft Balancer through the Bearing Then remove the Cylinder Vanes and the Rotor Remove the Key from the Shaft Balancer Support the Front Endplate with a bearing separator and use a l
13. t is aligned and engaged with the keyway on the Housing F Place the Washer over the Screw Thread the screw into the CV Swivel Exhaust Assembly or 1 in 28 mm CV Swivel Exhaust Assembly Optional and Housing until the end of the screw is flush with the inside surface of the Housing Place the Nut into the cavity of the Housing and thread the screw into the nut until tight Move onto the Spindle bearing shield and Shaft Balancer Assem bly Section For Self Generated Vacuum SGV Exhaust machines G Install the 3 in 77 mm Shroud onto the Housing by working the shroud over and around the bottom of the housing flanges Make sure the line up slots on the Housing and tabs on the Shroud are engaged Slide the SGV Exhaust Adapter Fitting into the exhaust of the 3 in 77 mm CV Shroud H Lightly grease two O Rings and place them into the two grooves in the SGV Retainer Put the SGV Retainer into the mounting hole of the 1 in 28 mm Hose SGV Swivel Exhaust Assembly Stan dard or the in 19 mm Hose SGV Swivel Exhaust 34 8700 5192 6 3 J Assembly Optional Slide the Swivel Exhaust Assembly into the SGV Exhaust Adapter Fitting while at the same time inserting the SGV Retainer into the sander Housing exhaust port Screw the SGV Retainer into the threaded exhaust port on the Housing with an 8 mm hex key Torque to 45 in Ibs 5 08 Nm Spindle Bearings Bearing Shield and Shaft Balancer Assembly mi
14. using 2 Place the Speed Control to the midway position and re move the Retaining Ring NOTE If the machine is one of the vacuum models the vacuum exhaust assembly must be removed See section 1 above for removal before the Retaining Ring can be removed with lock ring pliers The Speed Control will now pull straight out Remove the O ring 3 Unscrew the Inlet Bushing Assembly from the Housing Remove the Spring Valve Valve Seat Valve Stem and the O ring from the Valve Stem 4 Press out the Spring Pin from the Housing and remove the Lever ASSEMBLY INSTRUCTIONS NOTE All assembly must be done with clean dry parts and all bearings are to be pressed in place by the correct tools and procedures as outlined by the bearing manufacturers Housing Assembly 1 Install Throttle Lever into Housing with Spring Pin 2 Lightly grease the O Ring and place it on the Speed Revision 10 03 07 Control Install the Valve Stem and O ring cleaned and lightly greased and insert the Speed Control into Hous ing in the midway position Install Retaining Ring CAUTION Make sure the Retaining Ring is completely snapped into groove in the Housing 3 Install the Valve Seat Valve and the Spring Coat the threads of the Inlet Bushing Assembly with 1 or 2 drops of 3M Rite Loc TL22 or equivalent non permanent pipe thread sealant Screw the Inlet Bushing Assembly into the inlet port on the Housing Torque to 60 in Ibs 6 77 Nm 4 For NV and CV
Download Pdf Manuals
Related Search