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Omitting the discs can put uneven stress on the wheel causing it to crack and possibly fly apart. ALWAYS “ring test” a wheel before assembly to make certain it has no cracks or flaws. OPERATIONS -13 M1104, M1105, M1106 Heavy-Duty Bench Grinder MAINTENANCE General MAINTENANCE Check for the following conditions and repair or replace when necessary: • Cracked or loose grinding wheel. • Loose mounting bolts. • Worn switch. • Worn or damaged cords and plugs. • Any other condition that could hamper the safe operation of this machine. Lubrication & Cleaning This grinder has sealed bearings that require no user lubrication. The grinding wheel should be inspected before every use. Use the ring test method noted in Changing Grinding Wheels on Page 13 to verify the structural integrity. Take care in storing grinding wheels to keep them free from potential damage by being dropped, or having other items drop on them. Replace the wheel when the wheel diameter is reduced to 4" for the M1104, 5" for the M1105, or 6 1.2" for the M1106. Operating at anything less than this diameter does not allow the proper surface speed for grinding or spacing of the tool rest and the eye shield, and the grinding wheel may fly apart. Depending on the type of grinding you do, the grinding wheel may require periodic dressing. There are several different types of wheel dressing devices available on the market. Use a suitable diamond or silicon carbide stick type dresser. Sweep it smoothly and evenly several times across the face of the wheel. Dressing restores the abrasive quality of the wheel surface, plus it will bring the wheel edge back to a square form. Refer to the instructions that accompany your dressing accessory for complete detail on wheel dressing. MAKE SURE that your machine is unplugged during all maintenance pro- cedures! If this warning is ignored, seri- ous personal injury may occur. -14 M1104, M1105, M1106 Heavy-Duty Bench Grinder Troubleshooting This section covers the most common problems and corrections with this type of machine. WARNING! DO NOT make any adjustments until power is disconnected and moving parts have come to a complete stop! PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION Motor will not start; fuses 1. Open circuit in motor or loose 1. Inspect/repair all lead connections on motor for loose or open or circuit breakers blow. connections. 2. Start capacitor is at fault. 3. Short circuit in motor or loose connections. 4. Incorrect fuses or circuit breakers in power supply. connections. 2. Replace start capacitor. 3. Inspect all connections on motor for loose or shorted terminals or worn insulation. 4. Install correct fuses or circuit breakers. Motor overheats, stalls 1. Motor overloaded. 1. Reduce load on motor. (resulting in blown fuses or tripped circuit). 2. Short circuit in motor or loose connections. 3. Depth of cut too great. 2. Inspect connections on motor for loose or shorted terminals or worn insulation. 3. Slow down the rate of movement of the workpiece into wheel. Wavy condition on surface of workpiece. 1. Machine vibrating. 2. Workpiece is not held in place firmly. 3. Wheel face uneven. 4. Wheel is too hard. 1. Make sure machine is securely mounted on a solid surface. 2. Use a holding device to firmly retain the workpiece. 3. Dress the grinding wheel. 4. Use softer wheel, or reduce the feed rate. Lines on surface of workpiece. 1. Impurity on wheel surface. 2. Workpiece not being held tightly. 1. Dress the grinding wheel. 2. Use a holding device to firmly retain the workpiece. Burning spots or cracks in the workpiece. 1. Improper type of grinding wheel. 2. Improper feed rate. 1. Try a wheel that is softer style or a coarser grit. 2. Slow down the rate of movement of the workpiece into wheel. Wheel dulls quickly, grit falls off. 1. Depth of cut too great. 2. Wheel is too soft. 3. Wheel diameter too small. 4. Bad wheel dress. 5. Defective wheel bonding. 1. Slow down the rate of movement of the workpiece into wheel. 2. Wheel too soft for the material being ground, select harder bond. 3. Replace the wheel. 4. Dress the wheel. 5. Consult manufacturer of grinding wheel. Wheel clogs and workpiece shows burn marks. 1. Wheel is too hard. 2. Feed rate too slow. 3. Bad wheel dress. 4. Wrong material is being ground. 1. Wheel too hard for the material being ground, select softer bond. 2. Increase the rate of movement of the workpiece into wheel. 3. Dress the wheel. 4. Grind ferrious metals only. -15 MAINTENANCE M1104, M1105, M1106 Heavy-Duty Bench Grinder M1104 Electrical System MAINTENANCE -16- Figure 9. M1104 Wiring. ............................................................................................................................................................................................................................................................ ..............................................................................................................................................................

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