Bosch Power Tools RH745, RH850VC manual Operating Instructions, Dual Function Trigger Switch

BM 160992A0H1 01-14_RH745 RH850VC 1/22/14 10:22 AM Page 9

Operating Instructions

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.

Chipping (Demolition)

Area of application	Control setting
Plaster work	1 - 2
Removing tiles	3
Brick work	4
Concrete	5 - 6
Drilling Holes
Lower speeds	Higher speeds
Accurate starts	Faster penetration
Minimize breakouts
when the bit exits
the material.

"TURbO" FEATURE

In the "Hammer Only" mode power is automatically increased 10% when the tool is turned on to provide maximum chiselling performance.

RH850VC ONLy: ELECTRONIC

FEEDbACK CIRCUITRy (EFC)

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

HANDLE / HAMMER MECHANISM

The integrated vibration damper in the main handle and hammer mechanism reduces vibrations (Fig. 1).

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 ! CAUTION 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

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.

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