Trigger Controlled Variable Speed

BM 1619929843 05-08 5/21/08 3:39 PM Page 8

Your tool is equipped with a variable speed trigger switch. The tool speed can be controlled from minimum to maximum nameplate rated RPM by the pressure you apply to the trigger. Apply more pressure to increase the speed and release pressure to decrease speed (Fig. 1).

TRIGGER RELEASE SWITCH

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.

TO LOCK TOOL “ON”: turn the selector dial to the Hammering Only mode and squeeze the trigger switch until it locks (Fig. 1).

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. The speed and impact force can be adjusted by rotating the dial. Higher speeds and impact force work best for faster penetration when drilling or chiseling in hard masonry material. Slower speeds work best to reduce breakout when bits exit material being drilled or chiseling material such as plaster or tile (Fig. 1).

Regardless of the pressure applied on the trigger, the tool will not operate any faster than maximum speed setting selected.

AUTO-MAX ™

The patented Bosch Auto-Max system insures that each time your tool is plugged in and receiving power, it will operate at maximum speed and impact force.

!WARNING When the power cord is unplugged from the mains

outlet or when branch-circuit power is interrupted, the electronic controller will automatically reset the tool to maximum speed and impact force. Unexpected starting at maximum operating speed and impact force could startle the operator and lead to potential injury.

"TURBO" FEATURE

In the "Hammer Only" mode power is automatically increased 20% when the tool is turned on to provide maximum chiselling performance.

CONSTANT RESPONSE CIRCUITRY

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.

SELECTOR LEVER

The selector lever allows the tool to be set for various applications as listed in the following chart, (Fig. 4).

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.

Turn the selector lever, to the “vario-lock” setting. Next, rotate the locking sleeve, along with the accessory, to the desired position. Then turn the selector lever to the “hammer only” setting and slightly turn the locking sleeve to have it automatically lock into a definite position.

FIG. 4

Drilling/Hammering:

Vario-Lock:

Hammering Only:

used for drilling with solid carbide bits and core bits

allows chisel to be set in	used for chipping
one of 12 positions (right or	and demolition work
left “0” position)

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