424. When servicing a tool, use only identicalreplacement parts. Follow instructions inthe Maintenance section of this manual.Use of unauthorized parts or failure to followMaintenance instructions may create a risk ofelectric shock or injury.USE PROPER EXTENSION CORD: Make sure your extension cord is in good condition.When using an extension cord, be sure to use one heavy enough to carry the current yourproduct will draw. An undersized cord will cause a drop in line voltage resulting in loss ofpower and overheating. Table 1 shows the correct size to use depending on cord length andnameplate ampere rating. If in doubt, use the next heavier gage. The smaller the gage num-ber, the heavier the cord.SPECIFIC SAFETY RULES USB009-2DO NOT let comfort or familiarity with product (gained fromrepeated use) replace strict adherence to hammer safety rules.If you use this tool unsafely or incorrectly, you can suffer seri-ous personal injury.1. Hold tools by insulated gripping surfaceswhen performing an operation where thecutting tool may contact hidden wiring orits own cord. Contact with a “live” wire willmake exposed metal parts of the tool “live”and shock the operator.2. Wear ear protectors when using the toolfor extended periods. Prolonged exposureto high intensity noise can cause hearingloss.3. Wear a hard hat (safety helmet), safetyglasses and/or face shield. Ordinary eyeor sun glasses are NOT safety glasses. Itis also highly recommended that you weara dust mask and thickly padded gloves.4. Be sure the bit is secured in place beforeoperation.5. Under normal operation, the tool isdesigned to produce vibration. Thescrews can come loose easily, causing abreakdown or accident. Check tightnessof screws carefully before operation.6. In cold weather or when the tool has notbeen used for a long time, let the toolwarm up for a while by operating it underno load. This will loosen up the lubrica-Table 1: Minimum gage for cordAmpere Rating Volts Total length of cord in feet120 V 25 ft. 50 ft. 100 ft. 150 ft.More Than Not More Than AWG0 6 18 16 16 146 10 18 16 14 1210 12 16 16 14 1212 16 14 12 Not Recommended