5rotation before the tool stops may damage the tool.• If the switch trigger can not be depressed, check tosee that the reversing switch is fully set toposition (A side) or (B side).Selecting the action mode1008894This 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 thetool.Installing side grip (auxiliary handle)1008895Always use the side grip to ensure operating safety.Install the side grip on tool barrel.Then tighten the grip by turning clockwise securely atthe desired position. It may be swung 360° so as to besecured at any position.NOTE:• The side grip cannot swing 360° when the depthgauge is installed.Installing or removing drill bitFor Model HP16301008896To 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 counterclockwisein just one hole, then loosen the chuck by hand.For Model HP163112008900Hold the ring and turn the sleeve counterclockwise toopen the chuck jaws. Place the bit in the chuck as far asit will go. Hold the ring firmly and turn the sleeveclockwise to tighten the chuck.To remove the bit, hold the ring and turn the sleevecounterclockwise.Depth gauge123008897The depth gauge is convenient for drilling holes ofuniform depth. Loosen the side grip and insert the depthgauge into the hole in the side grip. Adjust the depthgauge to the desired depth and tighten the side grip.NOTE:• The depth gauge cannot be used at the positionwhere the depth gauge strikes against the tool body.1. Depth gauge2. Side grip3. Grip base1. Sleeve2. Ring1. Chuck key1. Side grip1. Action modechange lever