Dewalt DCF887M2 Instruction Manual - Page 15

English mode will work as a screwdriver in light applications, before hesitating as the screw head reaches the work piece, and then (if required) start a slow controlled impact to ensure the head ends perfectly flush. NOTE: This mode is for light duty screwdriving applications. If the tool will not drive a fastener in Precision Mode, please select mode 2 which will give the additional power required. DCF887 Mode 1 Precision Drive rpm 0-1000 Mode 2 Normal Impacting rpm 0-2800 Mode 3 High Speed Impacting rpm 0-3250 FIG. 8 K Usage Your impact tool can generate the following maximum torque: Mode Ft.-Lbs. In.-Lbs. Nm 1 20 240 27 2 125 1500 170 3 152 1825 205 CAUTION: Ensure fastener and/or system will withstand the level of torque generated by the tool. Excessive torque may cause breakage and possible personal injury. 1. Place the accessory on the fastener head. Keep the tool pointed straight at the fastener. 2. Press switch to start operation. Release switch to stop operation. Always check torque with a torque wrench, as the fastening torque is affected by many factors including the following: • Voltage: Low voltage, due to a nearly discharged battery, will reduce fastening torque. • Accessory size: Failure to use the correct accessory size will cause a reduction in fastening torque. • Bolt size: Larger bolt diameters generally require higher fastening torque. Fastening torque will also vary according to length, grade, and torque coefficient. • Bolt: Ensure that all threads are free of rust and other debris to allow proper fastening torque. • Material: The type of material and surface finish of the material will affect fastening torque. • Fastening time: Longer fasten­ing time results in increased fastening torque. Using a longer fastening time than recommended could cause the fasteners to be overstressed, stripped or damaged. MAINTENANCE WARNING: To reduce the risk of serious personal injury, place the forward/reverse button in the lock-off position or turn tool off and disconnect battery pack before making any adjustments or removing/installing attachments or accessories. An accidental start-up can cause injury. 13