Bosch Power Tools Comprehensive Manual for High-Performance Drill Models 11241EVS and 11248EVS

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being drilled or chiseling material such as plaster or tile.

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

"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.

SLIP CLUTCH

The tool has a internal pre-set slip clutch. The output spindle will stop rotating if the accessory binds and overloads the tool.

AUXILIARY HANDLE

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 securely retighten the hand grip.

POWER INDICATOR LIGHT

When you plug your tool into the power source, the power indicator light will go “ON” indicating the tool is receiving power.

FIG. 4

Drilling/Hammering:	Vario-Lock:	Hammering Only:
used for drilling with solid	allows chisel to be set in	used for chipping
carbide bits and core bits	one of 12 positions	and demolition work
	(right or left “0” position)

"TOOL TIPS"

For the best penetration rates in concrete, run the tool with a steady pressure, but do not use excessive force as this will decrease the efficiency of the tool.

All hammers require a short period of time to warm up. Depending on the room temperature, this time may vary from approximately 15 seconds (90˚F) to 2 minutes (32˚F). A new hammer requires a break-in period before full performance is

realized. This period may require up to 5 hours of operation.

A combination hammer is likely to be the most expensive portable tool at the construction job. The long wear and efficient operation of the BOSCH hammers will more than justify the cost for tools of this type. As earlier pointed out, sharp accessories as well as clean air vents are necessary for efficient operation. Establish and follow a set maintenance program.

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