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Tighten the chuck around the shorter end of a hex key (not supplied) of 5mm or greater size. Using a wooden mallet or similar object, strike the longer end in the clockwise direction. This will loosen the screw inside the chuck. 1. Open chuck jaws fully. 2. Insert a 5mm hex key into front of chuck between jaws to engage screw head. Remove screw by turning clockwise. 3. Place the hex key in chuck and tighten. Using a wooden mallet or similar object, strike key sharply in the anti-clockwise direction. This will loosen the chuck so that it can be unscrewed by hand. Chuck installation 1. Screw the chuck on by hand as far as it will go and insert screw (LH thread). 2. Tighten the chuck around the shorter end of hex key (not supplied) strike the longer end in the clockwise direction with a wooden mallet. 3. Remove the hex key and open the jaws fully. Tighten the screw in the centre of the chuck firmly, with the hex key in an anti-clockwise direction. 13 Drilling metals • For maximum performance, use high speed steel bits for metal or steel drilling. • Ensure that the torque adjustment / hammer selection collar (2) is in normal drilling mode. • Begin drilling at a very low speed to prevent the bit from slipping off the starting point. • Always clamp sheet metal. • Support thin metal with a block of wood to avoid distorting it. • Use a punch to mark the centre of the hole. • Use a suitable lubricant for the material you are working on. Use: for: Oil Steel Turpentine or paraffin Aluminium Do not lubricate Brass, copper or cast iron Drilling plastics and plastic coated chipboard • Use high speed drill bits • See drilling wood below Drilling masonry • For maximum performance use carbide-tipped masonry impact bits when drilling holes in brick, tile, concrete etc. • Turn the mode selector to hammer mode, then rotate the torque collar to the drill position. • Apply light pressure and medium speed for best results in brick. • Apply additional pressure and high speed for hard materials such as concrete. • When drilling holes in tile, practice on a scrap piece to determine the best speed and pressure. Drilling wood • For maximum performance, use high speed steel bits for wood drilling. • Ensure that the mode selector is in normal drilling mode. • Begin drilling at a very low speed to prevent the bit from slipping off the starting point. Increase the speed as the drill bites into the material. • When drilling through holes, place a block of wood behind the work piece to prevent ragged or splintered edges on the back side of the hole. • WARNING. Never attempt to lock the trigger switch in the on position, do not lock the trigger on jobs where your hammer drill may need to be stopped suddenly. All drilling operations • Mark off the centre of the hole using a centre punch or nail. 14 Care • Don’t force the drill, let it work at its own pace • Keep the drill bit sharp. • Reduce pressure, as the drill is about to break through the item being drilled. Maintenance • Store the tools, instruction manual and where necessary the accessories in the original packaging. In this way you will always have all the information and parts ready to hand. • Do not throw used batteries into fire or water. There is a danger of explosion! Please hand in non-working or used batteries, or tools with built-in batteries, to the environmentally-safe disposal unit at a municipal waste- disposal centre, or to your dealer. Power cord maintenance If the supply cord needs replacing, the task must be carried out by the manufacturer, the manufacturer’s agent, or an authorised service centre in order to avoid a safety hazard. GMC customer assist If your product needs repairing, replacing, technical service or you simply need help or advice, please contact us on our Customer Assist Line 1300 880 001 (Australia) or 0800 445 721 (New Zealand). For prompt service we suggest you log your service request online at Should you not have access to the Internet, please contact our service department on 1300 880 001 (Australia) or 0800 445 721 (New Zealand). 7am – 7pm, 7days a week (AEST). Please note that if repair or replacement is required, you must provide a valid original purchase receipt. You will need the following details at hand to log your service request; Personal details: First & Last name, address, pick up address, contact phone numbers, email address Product details: Product number, date of purchase, retailer bought from, State & postcode, receipt number, reason for the request, copy of official purchase receipt Attach your purchase receipt and save with this Manual for future reference. Please refer to our website for full GMC warranty Terms and Conditions. GMC customer assist If your product needs repairing, replacing, technical service or you simply need help or advice, please contact us on our Customer Assist Line 1300 880 001 (Australia) or 0800 445 721 (New Zealand). For prompt service we suggest you log your servi...

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