22. Have your tool repaired by an expert
This electric appliance is in accordance with the
relevant safety rules. Repairing of electric appli-
ances may be carried out only by experts other-
wise it may cause considerable danger for the
user.
ADDITIONAL SAFETY RULES
1. Wear a hard hat (safety helmet), safety glasses
and/or face shield. It is also highly recom-
mended that you wear a dust mask, ear pro-
tectors and thickly padded gloves.
2. Be sure the bit is secured in place before
operation.
3. Under normal operation, the tool is designed
to produce vibration. The screws can come
loose easily, causing a breakdown or accident.
Check tightness of screws carefully before
operation.
4. In cold weather or when the tool has not been
used for a long time, let the tool warm up for
several minutes by operating it under no load.
This will loosen up the lubrication. Without
proper warm-up, hammering operation is dif-
ficult.
5. Always be sure you have a firm footing.
Be sure no one is below when using the tool in
high locations.
6. Hold the tool firmly with both hands.
7. Keep hands away from moving parts.
8. Do not leave the tool running. Operate the tool
only when hand-held.
9. Do not point the tool at any one in the area
when operating. The bit could fly out and
injure someone seriously.
10. When drilling or chipping into walls, floors or
wherever “live” electrical wires may be
encountered, DO NOT TOUCH ANY METAL
PARTS OF THE TOOL!
Hold the tool by the insulated grasping sur-
faces to prevent electric shock if you drill or
chip into a “live” wire.
11. Do not touch the bit or parts close to the bit
immediately after operation; they may be
extremely hot and could burn your skin.
SAVE THESE INSTRUCTIONS.
OPERATING INSTRUCTIONS
Side grip (auxiliary handle) (Fig.1&2)
For maximum control and safer operation, always use
the side grip with this tool. The side grip swings
around to either side, allowing easy handling of the
tool in any position. Loosen the side grip by turning it
counterclockwise, swing it to the desired position and
then tighten it by turning clockwise. (Fig. 1)
The side grip can also be installed in the position
shown in Fig. 2. Remove the side grip from the grip
base by turning the side grip counterclockwise. Screw
the side grip on either side of the tool, whichever is
convenient.
Installing or removing drill bit or other bits
(bull point, etc.) (Fig.3&4)
Important:
Always be sure that the tool is switched off and
unplugged before installing or removing the bit.
Press in the tool retainer and turn it until the red dots
on the tool retainer and the tool holder are aligned.
Release the tool retainer. (Fig. 3)
Insert the bit into the tool holder as far as it will go.
Press in the tool retainer and turn it a full 180 degrees.
Then release it to secure the bit. (Fig. 4)
CAUTION:
Never useA-type shank bits. They can cause damage
to the tool.
To remove the bit, follow the installation procedure in
reverse.
Selecting action mode (Fig. 5)
(Not available for HR3520B)
Rotation with hammering:
For drilling in concrete, masonry, etc., rotate the
change lever to the position.
Hammering only:
For chipping, scaling or demolition operations, rotate
the change lever to the position.
CAUTION:
•Do not rotate the change lever when the tool is
running under load. The tool will be damaged.
•To avoid rapid wear on the mode change mecha-
nism, be sure that the change lever is always
positively located in one of the two action mode
positions.
Adjusting depth of drilling (Fig. 6)
Loosen the wing bolt and adjust the depth gauge to
the desired depth. After adjusting, tighten the wing
bolt.
Switch action (Fig. 7)
CAUTION:
•Before plugging in the tool, always check to see that
the switch trigger actuates properly and returns to
the “OFF” position when released.
•Do not tape, tie or otherwise secure the trigger in
the “ON” position.
To start the tool, simply pull the trigger. Release the
trigger to stop.
6