Selector Lever - Bosch RH745 Operating/Safety Instructions Manual

BM 160992A0H1 01-14_RH745 RH850VC 1/22/14 10:22 AM Page 9
DUAL FUNCTION TRIGGER SWITCH
To turn the tool "ON" in the Drilling/
Hammering mode, squeeze and hold the
trigger switch. To turn the tool "OFF", release
the trigger switch, which is spring loaded and
will return to the "OFF" position automatically
(Fig. 1).
Your tool is also equipped with a "Lock-ON"
feature when the selector dial is in the
Hammering Only mode which allows
continuous operation without holding the
trigger (Fig. 1).
TO LOCK TOOL "ON": turn the selector dial
to the Hammering Only mode and squeeze
the trigger switch until it locks.
TO TURN TOOL: "OFF" press the trigger
release switch and the trigger will return to
the "OFF" position automatically.
To increase switch life, do not turn switch on
and off while tool is under load.
VARIAbLE SPEED DIAL
Your tool is equipped with a variable speed
dial (Fig. 1). The impact rate (BPM) and
rotating speed (RPM) can be varied
according to the type of work being
performed by setting the variable speed dial
to the selected setting. The chart below will
help you to determine which setting to use for
your application. However, a pre-test will
determine the best speed setting, as the
chart is intended only as a guide. Once the
proper setting is determined the impact rate
and rotating speed is kept constant by means
of the "Electronic Feedback Circuitry". The
variable speed dial can be adjusted while the
motor is running, allowing the operator to
adjust the impact rate and rotating speed
according to the actual application.

SELECTOR LEVER

The selector lever allows the tool to be set for
various applications as listed in the following
chart, (Fig. 4).
Do not operate the selection
C UTION
dial until the tool comes to a
complete stop. Shifting during rotation of the
chuck can cause damage to the tool.
When using demolition or chipping bits such
Operating Instructions
Area of application
Accurate starts
Minimize breakouts
when the bit exits
the material.
In the "Hammer Only" mode power is
automatically increased 10% when the tool is
turned on to provide maximum chiselling
performance.
The internal electronic feedback system
provides a "soft start", which will reduce the
stresses that occur from a high torque start.
The system also helps to keep the pre-
selected impact rate and rotating speed
virtually constant between no-load and load
conditions.
RH850VC ONLy: VIbRATION DAMPER
The integrated vibration damper in the main
handle and hammer mechanism reduces
vibrations (Fig. 1).
as bull points, chisels, spades, gouges, etc.
the "Hammer Only" mode must be selected.
SELECTOR LEVER - "VARIO-LOCK"
The vario-lock can be set in any one of twelve
positions (30˚ increments). Choose a position
which is best suited for your operation. The
Vario-Lock position is intended for use with
chipping bits such as bull points, spades,
gouges, etc.
-9-
Chipping (Demolition)
Plaster work
Removing tiles
Brick work
Concrete
Drilling Holes
Lower speeds
Faster penetration
"TURbO" FEATURE
RH850VC ONLy: ELECTRONIC
FEEDbACK CIRCUITRy (EFC)
HANDLE / HAMMER MECHANISM
Control setting
1 - 2
3
4
5 - 6
Higher speeds