Maintenance - Makita HR2420 Betriebsanleitung

Drilling in wood or metal (Fig. 10)
Use the optional drill chuck assembly (consisting of
drill chuck and chuck adapter assembly). When
installing it, refer to ''Installing or removing drill bit''
described on the previous page. Set the action mode
changing knob to ''rotation only''. You can drill up to
13 mm diameter in metal and up to 32 mm diameter in
wood.
CAUTION:
Never use ''rotation with hammering'' when the drill
chuck assembly is installed on the machine. The drill
chuck assembly may be damaged. Also, the drill
chuck will come off when reversing the machine.
NOTE:
If you need to assemble the drill chuck and chuck
adapter assembly, proceed as follows.
Secure the drill chuck in a vise or similar securing
devise. Place the chuck key in one of the three holes
so that the chuck body will not turn. (Fig. 11)
Remove the screw from the chuck adapter assembly
and screw the chuck adapter into the drill chuck. Use
a wrench to tighten the chuck adapter securely,
applying about 300 – 400 kgf . cm torque. (Note: you
can obtain 300 – 400 kgf . cm torque by applying pres-
sure of 30 – 40 kg to the wrench while holding the
portion 10 cm from the wrench head.)
Open the chuck jaws fully and insert the screw
through the chuck opening. Tighten the screw coun-
terclockwise with a screwdriver. (Fig. 12)

MAINTENANCE

CAUTION:
Always be sure that the machine is switched off and
unplugged before carrying out any work on the
machine.
To maintain product safety and reliability, repairs,
maintenance or adjustment should be carried out by
Makita Authorized Service Center.
7