Makita BHP452A Owners Manual - Page 8
Maintenance
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• A stuck bit can be removed simply by setting the reversing switch to reverse rotation in order to back out. However, the tool may back out abruptly if you do not hold it firmly. • Always secure small workpieces in a vise or similar hold-down device. • If the tool is operated continuously until the battery cartridge has discharged, allow the tool to rest for 15 minutes before proceeding with a fresh battery. Drilling in wood When drilling in wood, the best results are obtained with wood drills equipped with a guide screw. The guide screw makes drilling easier by pulling the bit into the workpiece. Drilling in metal To prevent the bit from slipping when starting a hole, make an indentation with a center-punch and hammer at the point to be drilled. Place the point of the bit in the indentation and start drilling. Use a cutting lubricant when drilling metals. The exceptions are iron and brass which should be drilled dry. MAINTENANCE CAUTION: • Always be sure that the tool is switched off and the battery cartridge is removed before attempting to perform inspection or maintenance. Replacing carbon brushes 1. Limit mark 1. Rear cover 1 2. Screws 2 008355 Raise the arm part of the spring and then place it in the recessed part of the housing with a slotted bit screwdriver of slender shaft or the like. 1 1. Recessed part 2. Spring 3. Arm 007428 2 3 Use pliers to remove the carbon brush caps of the carbon brushes. Take out the worn carbon brushes, insert the new ones and replace the carbon brush caps in reverse. 1. Carbon brush cap 1 1 006258 Replace when they wear down to the limit mark. Keep the carbon brushes clean and free to slip in the holders. Both carbon brushes should be replaced at the same time. Use only identical carbon brushes. Use a screwdriver to remove two screws then remove the rear cover. 007429 Make sure that the carbon brush caps have fit into the holes in brush holders securely. 1 1. Hole 2. Carbon brush cap 2 006304 8