Bosch 11221DVS Operating Instructions - Page 8

BM 1619929265 2/03 2/11/03 4:09 PM Page 8 SELECTOR DIAL The selector dial allows the tool to be set for various applications as listed in the following chart, (Fig. 3). When using demolition or chipping bits such as bull points, chisels, spades, gouges, etc. the "Hammer Only" mode must be selected. = drilling only: used for... drilling wood, steel, etc. = drilling/hammering: used for... drilling concrete = hammering only: used for... light chipping work = vario-lock: allows for 36 desired positions of "hammer" accessories SELECTOR DIAL - "VARIO-LOCK" Adjusting the Vario-Lock: The vario-lock can be set in any one of thirty-six (10˚ increments) positions. Choose a position which is best suited for your operation. Depress release button and turn the selector dial, to the "vario-lock" setting. Next, rotate the locking sleeve, along with the accessory, to the desired position. Then turn the selector dial 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. 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 grease packed 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 rotary 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. -8-