5This tool has a reversing switch to change the direction ofrotation. Move the reversing switch lever to the posi-tion (A side) for clockwise rotation or the position (Bside) for counterclockwise rotation.CAUTION:• Always check the direction of rotation before opera-tion.• Use the reversing switch only after the tool comesto a complete stop. Changing the direction of rota-tion before the tool stops may damage the tool.Speed changeTwo speed ranges can be preselected with the speedchange knob.To change the speed, turn the speed change knob sothat the arrow on the tool body points toward the “I” posi-tion on the knob for low speed or “II” position for highspeed.If it is hard to turn the knob, first turn the chuck slightly ineither direction and then turn the knob again.CAUTION:• Use the speed change knob only after the toolcomes to a complete stop. Changing the tool speedbefore the tool stops may damage the tool.• Always set the speed change knob to the correctposition. If you operate the tool with the speedchange knob positioned halfway between the “I”and “II” position, the tool may be damaged.Selecting the action modeThis tool has an action mode change lever. For rotationwith hammering, slide the action mode change lever tothe right ( symbol). For rotation only, slide the actionmode change lever to the left ( symbol).CAUTION:• Always slide the action mode change lever all theway to your desired mode position. If you operatethe tool with the lever positioned halfway betweenthe mode symbols, the tool may be damaged.ASSEMBLYCAUTION:• Always be sure that the tool is switched off andunplugged before carrying out any work on the tool.Installing side grip (auxiliary handle)Always use the side grip to ensure operating safety.Install the side grip so that the teeth on the grip fit inbetween the protrusions on the tool barrel.Then tighten the grip by turning clockwise at the desiredposition. It may be swung 360° so as to be secured atany position.Installing or removing drill bitFor Model HP2050, HP2050FTo install the bit, place it in the chuck as far as it will go.Tighten the chuck by hand. Place the chuck key in eachof the three holes and tighten clockwise. Be sure totighten all three chuck holes evenly.To remove the bit, turn the chuck key counterclockwise injust one hole, then loosen the chuck by hand.After using the chuck key, be sure to return to the originalposition.1. Arrow2. Speed changeknob1. Action modechanging lever1200269110026921. Grip base2. Side grip (auxil-iary handle)3. Teeth4. Protrusions1. Chuck key12340026931002694