Operating Instructions

BM 1619929H13 9-04 9/22/04 2:19 PM Page 7

TRIGGER "ON-OFF" SWITCH

To turn the tool “ON” 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.

Your tool is also equipped with a "Lock-ON" feature which allows continuous operation without holding the trigger.

TO LOCK TOOL “ON”: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.

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.

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 chiseling in hard masonry material. Slower speeds work best for chiseling material such as plaster or tile.

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.

INSTALLING ACCESSORIES

Clean the insert shank end of the accessory to remove any debris, then lightly grease with a light oil or lubricant.

Insert accessory into the tool holder through the dust shield, while twisting and pushing inward until it locks automatically into place. Pull outward on the accessory to be certain it is locked into the tool holder.(fig. 2).

FIG. 2

LOCKING SLEEVE

NOTE: The high efficiency available from the rotary hammers can only be obtained if sharp and undamaged accessories are used. The "cost" to maintain sharp and undamaged accessories is more than offset by the "time saved" in operating the tool with sharp accessories.

REMOVING ACCESSORIES

! WARNING Accessories may be hot after use. Avoid contact with skin

and use proper protective gloves or cloth to remove.

To remove an accessory, pull and hold locking sleeve backward and pull bit forward. All accessories should be wiped clean after removing.

"VARIO-LOCK"- SELECTOR RING

The vario-lock selector ring can be set in any one of twelve (30˚ increments) positions. Choose a position which is best suited for your operation. To adjust, pull the selector ring forward and hold firmly, then turn both the accessory and the selector ring to the desired position. Release the selector ring and turn the accessory slightly until it locks in place.

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