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2). NOTE: You may notice some “wobble” or “run out” of the bit when run in a no load condition. This is due to the quick change SDS tool holder assembly. However, once the bit has a load placed upon it, the bit automatically centers itself to produce an accurate hole. 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 Area of application Control setting Plaster work 1 - 2 Removing tiles 3 Brick work 4 Concrete 5 - 6 Drilling Holes Lower speeds Higher speeds Larger holes Smaller holes Accurate starts Faster penetration Minimize breakouts when the bit exits the material. 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. -7 ! 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. FIG. 2 LOCKING SLEEVE BM 1619929320 2/03 2/12/03 9:42 AM 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. stops. When the locking sleeve stops, pull the whole SDS tool holder assembly outward until it pulls free from the tool’s spindle mount. To install an optional accessory tool holder or re-install the SDS tool holder, align the steel balls inside the accessory with the grooves in the front of the tool’s spindle mount. Next rotate the accessorie’s locking sleeve in the rotational direction of the bit (clockwise) until it stops. When the locking sleeve stops, release it and the accessory tool holder will automatically rotate back and lock itself into place. 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. DEPTH GAUGE Your drilling depth can be pre-set and/or repeated by using the depth gauge. Setting depth: After the auxiliary handle is installed, slide the depth gauge to desired depth and securely tighten wing knob. 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. = 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. QUICK CHANGE SDS TOOL-HOLDER This tool features a removable tool holder which allows a rapid change from the SDS tool holder, which is LOCKING SLEEVE standard equipment, to optional accessory tool holders. To remove the SDS tool holder assembly, rotate the locking sleeve in the rotational direction of the bit (clockwise) until it -8 BM 1619929320 2/03 2/12/03 9:42 AM Page 9 Maintenance Service Preventive maintenance performed by unauth ! WARNING orized personnel may result in misplacing of internal wires and components which could cause serious hazard. We recommend that all tool service be performed by a Bosch Factory Service Center or Authorized Bosch Service Station. SER...