Craftsman 4 Belt Owners Manual
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11 OPERATION Clamp or otherwise secure the work to prevent it from moving under your sander. WARNING: Unsecured work could be thrown back toward operator causing injury. Before placing sander on work surface, squeeze the switch trigger and let the motor reach its maximum speed, then lower your sander to the work surface with a slight forward motion. Using the rear handle to control your sander and the front handle only to guide it, move it slowly over the work. Allowing your sander to remain in one place will result in an uneven sur- face.Fig. 10 SANDING See Figure 10. WARNING: Keep a firm grip on sander with both hands at all times. Failure to do so could result in loss of control leading to possible serious injury. Your sander was designed to provide the proper weight on the sanding belt. Excessive pressure will result in the following: Uneven work. Clogged sanding belts. Premature sanding belt wear. Removal rate will not increase. Possible motor burnout. Irregular sanding belt tracking. Note: If the sanding belt moves while sanding, you may be applying too much pressure. When this occurs remove sander from workpiece. If belt tracking is properly adjusted, sanding belt will return to its normal and correct position on the drive roller and front roller. Use a coarser belt when heavy sanding is desired, not heavy pressure. The importance of this cannot be overemphasized. Weight has been built into the tool to give the most efficient pressure at the proper location. Note: The front roller of your sander was not de- signed for contour sanding. Sanding on the front roller could cause irregularity in sanding belt tracking. OPERATION OPERATION
12 MAINTENANCE WARNING: When servicing, use only identical Craftsman replacement parts. Use of any other part may create a hazard or cause product damage. TIMING BELT REPLACEMENT See Figures 11 and 12. Unplug your sander. WARNING: Failure to unplug your sander could result in accidental starting causing possible serious personal injury. When replacing timing belt, use replacement belt number 989368-000 only. See key number 5 on parts list, page 17. Remove sanding belt from sander. Follow instructions on page 8 to remove sanding belt. Note: Removing the sanding belt will simplify the process of installing a new timing belt. Remove the two belt cover screws and belt cover. See Figure 11. Fig. 11Fig. 12 SANDER SHOWN WITH SANDING BELT REMOVEDLARGE PULLEY SMALL PULLEY TIMING BELT BELT COVER SCREWS BELT COVER Force old timing belt from small pulley with a screwdriver and remove it from large pulley. If it is worn out, simply cut the old timing belt and remove. See Figure 11. Install new timing belt over small pulley first. Holding the timing belt as shown in Figure 12, press belt onto the large pulley turning it as you press the belt on. Reassemble belt cover and screws. Tighten screws securely. WARNING: Never attempt to operate your belt sander without belt cover in place. APPLY PRESSURE HERE AND TURN LARGE PULLEY
13 MAINTENANCE SWITCH REPLACEMENT See Figures 13 and 14. Unplug your sander. WARNING: Failure to unplug your sander could result in accidental starting causing possible serious personal injury. Remove the handle cover screws and handle cover. Note the locations of all wiring in the handle and how each connection is made to the switch. Connections and wiring position must be identical when installing new switch. See Figure 13. Fig. 14 Fig. 13 Lift the switch away from the handle. Release the leads from the switch by inserting a 1/32 in. diameter pin or nail into each switch lead receptacle. See Figure 14. Make lead connections to the new switch by pushing each lead as far as possible into the switch lead receptacles. Pull on leads to check lead connections with lead receptacles. Arrange the wiring in the handle so that it will not be pinched or contact screws when the handle cover and screws are replaced, then position the switch in place. See Figure 13. Replace handle cover and screws. Tighten handle cover screws securely.1/32 in. DIAMETER NAIL OR PINHANDLE COVER SCREW HANDLE SWITCH SCREW SCREWS MAINTENANCE
14 MAINTENANCE CORD REPLACEMENT See Figures 15 and 16. Unplug your sander. WARNING: Failure to unplug your sander could result in accidental starting causing possible serious personal injury. Remove the handle cover screws and handle cover. Note the locations of all wiring in the handle and how each connection is made to the switch. Connections and wiring position must be identical when installing new cord. See Figure 15.Fig. 16 Fig. 15 SWITCH HANDLE BEND RELIEF CORD Remove the switch from the handle. Release the cord leads from the switch by inserting a 1/32 in. diameter pin or nail into each cord lead receptacle. See Figure 16. Once loose, power cord leads can easily be removed from switch. Make lead connections to the new cord by pushing each lead of the new cord as far as possible into the proper switch lead receptacles. Pull on leads to check lead connections with lead receptacles. Arrange the wiring in the handle so that it will not be pinched or contact screws when the handle cover and screws are replaced. Position the switch in place. See Figure 15. Place the bend relief and cord in their correct locations. Replace handle cover and screws. Tighten handle cover screws securely.1/32 in. DIAMETER NAIL OR PINHANDLE COVER SCREW SCREW SCREWS
15 MAINTENANCE GENERAL Only the parts shown on parts list, page 17, are intended to be repaired or replaced by the customer. All other parts represent an important part of the double insulation system and should be serviced only by a qualified Sears service technician. Avoid using solvents when cleaning plastic parts. Most plastics are susceptible to damage from various types of commercial solvents and may be damaged by their use. Use clean cloths to remove dirt, carbon dust, etc. WARNING: Do not at any time let brake fluids, gasoline, petroleum-based products, penetrating oils, etc. come in contact with plastic parts. They contain chemicals that can damage, weaken or destroy plastic. It has been found that electric tools are subject to accelerated wear and possible premature failure when they are used on fiberglass boats, sports cars, wallboard, spackling compounds, or plaster. The chips and grindings from these materials are highly abrasive to electric tool parts such as bearings, brushes, commutators, etc. Consequently, it is not recommended that this tool be used for extended work on any fiberglass material, wallboard, spackling compounds, or plaster. During any use on these materials it is extremely important that the tool is cleaned frequently by blowing with an air jet. WARNING: Always wear safety goggles or safety glasses with side shields during power tool operation or when blowing dust. If operation is dusty, also wear a dust mask. LUBRICATION All of the bearings in this tool are lubricated with a sufficient amount of high grade lubricant for the life of the unit under normal operating conditions. Therefore, no further lubrication is required. EXTENSION CORDS The use of any extension cord will cause some loss of power. To keep the loss to a minimum and to prevent tool overheating, use an extension cord that is heavy enough to carry the current the tool will draw. A wire gage size (A.W.G.) of at least 14 is recommended for an extension cord 100 feet or less in length. When working outdoors, use an extension cord that is suitable for outdoor use. The cords jacket will be marked WA. CAUTION: Keep extension cords away from the sanding area and position the cord so that it will not get caught on lumber, tools, etc., during sanding operation. WARNING: Check extension cords before each use. If damaged replace immediately. Never use tool with a damaged cord since touching the damaged area could cause electrical shock resulting in serious injury.
16 CRAFTSMAN 4 in. BELT SANDER — MODEL NUMBER 315.117921 SEE NOTE A PAGE 17 12 3 5 610 7 89 71112 13 14 15 17 16181920 21 21 20 22 25 26 24 32 27 28 29 30 29 31 33 35 34 361 40 41 42 43 44 45 46 47 49 5048 5152 53 54 55 18 4 37 38 39 "S" HOOK BEFORE ASSEMBLYBEND "S" HOOK AS SHOWN AFTER ASSEMBLY 23
17 CRAFTSMAN 4 in. BELT SANDER — MODEL NUMBER 315.117921 Key Part No. Number Description Quan. PARTS LIST * Standard Hardware Item — May Be Purchased Locally *** Complete Assortment Available At Your Nearest Sears Catalog Order Or Retail Store NOTE: A - The assembly shown represents an important part of the Double Insulated System. To avoid the possibility of alteration or damage to the System, service should be performed by your nearest Sears Repair Center. Contact your nearest Sears Retail Store for Service Center information.29 998370-001 Bushing ......................................................... 2 30 967262-001 Torsion Spring .............................................. 1 31 998377-003 Platen ............................................................ 1 32 967878-003 Glamor Plate ................................................. 1 33 612665-006 * Screw (#10-32 x 7/8 in. Pan Hd. T.F.) .......... 2 34 *** Sanding Belt (4 in. x 21 in.) .......................... 1 35 998379-001 Backing Pad .................................................. 1 36 998381-001 Wear Plate .................................................... 1 37 998391-001 Drive Roller Assembly .................................. 1 38 703774-003 Steel Ball ....................................................... 1 39 998388-001 Spacer Cup ................................................... 1 40 976849-001 Logo Plate ..................................................... 1 41 989592-001 * Screw (#8-10 x 1-1/8 in. Fil. Hd.) .................. 3 42 999931-001 Blower Cover ................................................ 1 43 998393-001 Shroud .......................................................... 1 44 999347-001 Deflector ....................................................... 1 45 989592-007 * Screw (#8-10 x 2-1/4 in. Fil. Hd.) .................. 2 46 998398-001 Blower Housing ............................................. 1 47 998394-006 Dust Bag ....................................................... 1 48 617966-030 * Screw (#8-10 x 5/8 in. Pan Hd.) ................... 4 49 998399-001 Handle Cover ................................................ 1 50 999507-001 Cord .............................................................. 1 51 998895-001 Switch ........................................................... 1 52 706239-825 Washer ......................................................... 1 53 622347-003 Washer ......................................................... 1 54 998413-001 Gear .............................................................. 1 55 616103-301 Thrust Washer .............................................. 1 972000-492 Owners Manual Key Part No. Number Description Quan. 1 970201-001 * Screw (#8-32 x 3/8 in. Pan Hd. T.F.) ............ 4 2 998367-001 Belt Cover ..................................................... 1 3 607776-002 Driven Pulley ................................................. 1 4 614658-010 * Screw (#8-32 x 3/8 in. Pan. Hd.) .................. 3 5 989368-000 Timing Belt .................................................... 1 6 998366-203 Gear Housing Cover w/Bearing .................... 1 7 706382-812 Washer ......................................................... 2 8 998411-004 Pinion ............................................................ 1 9 726693-004 * Screw (#8-32 x 7/8 in. Fil. Hd.) ..................... 1 10 989366-000 Pulley ............................................................ 1 11 976851-001 Data Plate ..................................................... 1 12 998372-001 Tracking Screw ............................................. 1 13 616247-001 Spring ........................................................... 1 14 931744-059 Washer ......................................................... 1 15 999937-001 Blower ........................................................... 1 16 999448-003 Wear Strip ..................................................... 1 17 998401-001 * Screw (#10-32 x 3/8 in. Wafer Hd.) .............. 1 18 607461-001 Retaining Ring .............................................. 2 19 998067-001 S Hook ....................................................... 1 20 706239-820 Thrust Washer .............................................. 2 21 622199-003 O Ring ........................................................... 2 22 998374-004 Front Idler Roller w/Bearings ........................ 1 23 998410-004 Idler Roller Shaft ........................................... 1 24 998390-005 Yoke Assembly ............................................. 1 25 967265-002 Pivot Pin ........................................................ 1 26 999927-002 Release Lever Assembly .............................. 1 27 622347-001 Washer ......................................................... 1 28 999923-001 * Screw (#10-32 x 1/2 in. Pan Hd.) ................. 1 The model number will be found on a plate attached to the motor housing. Always mention the model number in all correspondence regarding your BELT SANDER or when ordering repair parts. PARTS LIST