Functional Description - Makita HR3520B Manual De Instrucciones

FUNCTIONAL DESCRIPTION

CAUTION:
• Always be sure that the tool is switched off and
unplugged before adjusting or checking function on the
tool.
Switch action (Fig. 1)
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 trig-
ger to stop.
Selecting the action mode (Fig. 2)
(Not available for HR3520B)
Rotation with hammering
For drilling in concrete, masonry, etc., rotate the change
lever to the H symbol.
Hammering only
For chipping, scaling or demolition operations, rotate the
change lever to the g symbol.
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 mechanism,
be sure that the change lever is always positively
located in one of the two action mode positions.
Adjusting depth of drilling (Fig. 3)
Loosen the wing bolt and adjust the depth gauge to the
desired depth. After adjusting, tighten the wing bolt.
ASSEMBLY
CAUTION:
• Always be sure that the tool is switched off and
unplugged before carrying out any work on the tool.
Side grip (auxiliary handle) (Fig. 4 & 5)
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 posi-
tion. Loosen the side grip by turning it counterclockwise,
swing it to the desired position and then tighten it by turn-
ing clockwise.
The side grip can also be installed in the position shown
in the figure. 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 the bit (Fig. 6)
Important:
Always be sure that the tool is switched off and
unplugged before installing or removing the bit.
Insert the bit into the tool holder as far as it will go. Pull
out and turn the tool retainer 180 degrees. Then release
it to secure the bit.
CAUTION:
• Never use A-type shank bits. They can cause damage
to the tool. (Fig. 7)
To remove the bit, follow the installation procedure in
reverse.
6
OPERATION
Hammer drilling operation (Fig. 8)
Set the change lever to the H symbol.
Position the bit at the desired location for the hole, then
pull the switch trigger. Do not force the tool. Light pres-
sure gives best results. Keep the tool in position and pre-
vent it from slipping away from the hole.
Do not apply more pressure when the hole becomes
clogged with chips or particles. Instead, run the tool at an
idle, then remove the bit partially from the hole. By
repeating this several times, the hole will be cleaned out
and normal drilling may be resumed.
CAUTION:
• There is a tremendous and sudden twisting force
exerted on the tool/bit at the time of hole break-
through, when the hole becomes clogged with chips
and particles, or when striking reinforcing rods embed-
ded in the concrete. Always use the side grip (auxiliary
handle) and firmly hold the tool by both side grip and
switch handle during operations. Failure to do so may
result in the loss of control of the tool and potentially
severe injury.
Blow-out bulb (optional accessory) (Fig. 9)
After drilling the hole, use the blow-out bulb to clean the
dust out of the hole.
Chipping/Scaling/Demolition (Fig. 10)
Set the change lever to the g symbol.
Hold the tool firmly with both hands. Turn the tool on and
apply slight pressure on the tool so that the tool will not
bounce around, uncontrolled. Pressing very hard on the
tool will not increase the efficiency.
Core bit (optional accessory)
When using the center bit
Screw the core bit on the adapter. Install the adapter with
the core bit in the tool in the same manner as a drill bit.
(Fig. 11)
Install the center bit. (Fig. 12)
Rest the core bit on the concrete and turn the tool on.
Once the core bit has cut a shallow groove into the con-
crete, remove the center bit. Then resume drilling.
(Fig. 13)
To remove the core bit, follow the procedures 1 or 2.
Rotate the change lever to the g position. Then rest
1.
the core bit on the concrete and turn the tool on. The
core bit will come loose from the hammering action.
(Fig. 14)
2. Hold the adapter with the wrench, insert the rod
(optional accessory) into the hole in the core bit and
tap with a hammer to unscrew. (Fig. 15)
When not using the center bit
Screw the core bit on the adapter. Install the adapter with
the core bit in the tool in the same manner as a drill bit.
(Fig. 16)
Rotate the change lever to the g position. Rest the core
bit on the concrete and turn the tool on. Once the core bit
has cut a shallow groove into the concrete, rotate the
change lever to the H position and resume drilling.
(Fig. 17)