Do you have a question about the Makita 8420V and is the answer not in the manual?
Keep work area clean and well lit. Cluttered or dark areas invite accidents.
Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools.
Wear ear protectors when impact drilling. Use auxiliary handle(s), if supplied with the tool. Hold the tool firmly with both hands.
Keep hands away from rotating parts. Do not leave the tool running. Do not touch the bit or workpiece immediately after operation.
Check switch trigger for proper actuation and return. Speed is increased by pressure on the trigger. Tool can be locked in 'ON' position.
Change lever for rotation with hammering or rotation only. Move lever to appropriate position for drilling concrete or wood/metal.
Fit teeth on side grip into grooves on tool. Tighten wing nut securely. Position can be changed in 30° increments.
Place bit in chuck as far as it will go and tighten by hand. Use chuck key to tighten all chuck holes evenly.
Position bit at desired location, pull trigger. Do not force the tool. Light pressure gives best results. Keep tool in position.
Best results with wood drills equipped with a guide screw. Guide screw aids in pulling bit into workpiece for easier drilling.
Use center-punch for starting holes to prevent slipping. Use cutting lubricant for drilling metals, except iron and brass.
Always ensure tool is switched off and unplugged before inspection or maintenance. Never use gasoline or thinners.
Product safety and reliability maintained by qualified service centers using identical replacement parts.