Operating Instructions - Bosch 12524 Operating/Safety Instructions Manual

BM 2610914845 3/03 3/18/03
VARIABLE SPEED CONTROLLED
TRIGGER SWITCH
Your tool is equipped with a variable speed
trigger switch. The tool speed can be
controlled from the minimum to the
maximum nameplate RPM by the pressure
you apply to the trigger. Apply more
pressure to increase the speed and release
pressure to decrease speed. This accurate
speed control enables you to drill without
center punching. It also permits you to use
as a power screwdriver. Bits are available for
driving screws as well as running bolts and
nuts (Fig. 1).
FORWARD/REVERSING LEVER &
TRIGGER LOCK
Your tool is equipped with a
forward/reversing lever and
trigger lock located above the
trigger (Fig. 2). This lever was
designed for changing rotation
of the chuck, and for locking
the trigger in an "OFF" position
to help prevent accidental
starts and accidental battery
discharge. For forward rotation,
(with chuck pointed away from
you) move the lever to the far
right. For reverse rotation move
the lever to the far left. To activate trigger
lock move lever to the center off position.
Do not change direction of
CAUTION
!
rotation until the tool
comes to a complete stop. Shifting during
rotation of the chuck can cause damage to
the tool.
MODE SELECTOR SWITCH
The mode selector switch allows the tool to
be set for various drilling/hammer drilling
applications. Slide the switch right or left
depending on the below applications (Fig. 1).
Drill only action: For drilling in
woods, metals, plastics or other non
concrete materials.
Drill with hammer action: For drilling
in concrete, asphalt, tile or other
similar hard materials.
GEAR SHIFTING
Your tool is equipped with two separate gear
ranges, low gear and high gear.
Low gear provides high-torque and slower
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Operating Instructions

drilling speeds for heavy duty work or for
driving screws.
High gear provides faster speeds for drilling
lighter work.
Changing gears: Change gear position only
with the motor at a complete standstill. To
change gears rotate the gear selection lever.
If you have difficulties changing from one gear
to the other, turn the chuck by hand until the
gears engage (Fig. 1).
The tool must be supported with the
auxiliary handle, which can be swiveled 360˚.
To reposition and/or swivel the handle,
loosen the hand grip, move the handle to the
desired position along the barrel and
FIG. 2
securely retighten the hand grip (Fig. 1).
Your drilling depth can be pre-set and/or
repeated by using the depth gauge.
Setting depth: After the auxiliary handle is
installed, slide the depth gauge to desired
depth and securely tighten wing knob.
When the trigger switch is released it
activates the brake to stop the chuck quickly.
This is especially useful in the repetitive
driving and removal of screws.
For small bits, open
jaws enough to insert
the bit up to the
flutes. For large bits,
insert the bit as far as
it will go. Center the
bit as you close the
jaws by hand. This
positions the bit
properly,
maximum contact
between the chuck
jaws and the bit
shank.
To tighten chuck, rotate chuck sleeve
clockwise and securely tighten by hand (Fig. 3).
WARNING
!
chuck to loosen or tighten bit. Friction burn
or hand injury is possible if attempting to
grasp the spinning chuck.
-8-
AUXILIARY HANDLE
DEPTH GAUGE
BRAKE
INSERTING BIT
Counter
FIG. 3
Clockwise
giving
CHUCK
SLEEVE Clockwise
Do not use the power of
the drill while grasping