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Therefore, either the symbol “ ” or the words and “Double insulation” appear on the power tool or on the nameplate. Although this system has no external grounding, you must still follow the normal electrical safety precautions given in this Instruction Manual, including not using the power tool in wet environments. To keep the double insulation system effective, follow these precautions: a. Only JOHN DEERE AUTHORIZED DEALER should disassemble or assemble this power tool, and only genuine JOHN DEERE replacement parts should be installed. b. Clean the exterior of the power tool only with a soft cloth moistened with soapy water, and dry thoroughly. Never use solvents, gasoline or thinner on plastic components; otherwise the plastic may dissolve. 1/2-Inch Hammer Drill Operator's Manual Functional Description NOTE: The information contained in this Instruction Manual is designed to assist you in the safe operation and maintenance of the power tool. NEVER operate, or attempt any maintenance on the tool unless you have first read and understood all safety instructions contained in this manual. Some illustrations in this Instruction Manual may show details or attachments that differ from those on your own power tool. MODEL: ET-3507-J 1/2-INCH HAMMER DRILL NAME OF PARTS: (Fig. 1) SPECIFICATIONS: Motor Single Phase, Series Commutator Motor Power source Single Phase 115V AC 60 Hz Current 6.8 A Reversible Yes Speed change 1 2 No-load speed 0–1100/min 0–2600/min Drill chuck capacity: 1/2" (13mm) Capacity: Steel-1/2" (13mm) 5/16" (8mm) Concrete-3/4" (20mm) 1/2" (13mm) Wood-1-9/16" (40mm) 1" (25mm) No-load impact rate 14000/min 36000/min Weight (Without Cord) 4.6 lbs (2.1 kg) 1/2-Inch Hammer Drill Operator's Manual Operation APPLICATIONS: By combined actions of ROTATION and IMPACT: Boring holes in hard surfaces (concrete, marble, granite, tiles, etc.) By ROTATIONAL action: Boring holes in metal, wood and plastic. PRE-OPERATION: 1. Power source: Ensure that the power source to be utilized conforms to the power source require ments specified on the product nameplate. 2. Power switch: Ensure that the switch is in the OFF position. If the plug is connected to a receptacle while the switch is in the ON position, the power tool will start operating immediately and can cause serious injury. 3. Extension cord: When the work area is far away from the power source, use an extension cord of sufficient thickness and rated capacity. The extension cord should be kept as short as practicable. WARNING: DAMAGED CORD MUST BE REPLACED OR REPAIRED. 4. Check the receptacle If the receptacle only loosely accepts the plug, the receptacle must be repaired. Contact a licensed electrician to make appropriate repairs. If such a faulty receptacle is used, it may cause overheating, resulting in a serious hazard. 5. Confirming condition of the environment: Confirm that the work site is placed under appropriate conditions conforming to prescribed precautions. 6. Selecting the appropriate drill bit: a. When boring concrete or stone, use a masonry drill bit. b. When boring metal or plastic, use an ordinary metalworking drill bit. c. When boring wood, use an ordinary woodworking drill bit. However, when drilling 1/4" (6.5 mm) or smaller holes, use a metalworking drill bit. 7. Mounting and dismounting of the bit. (Fig. 2) Fit the drill bit into the chuck and use the chuck wrench to secure it, tightening the chuck by each of the three holes in turn. (Fig. 2) 1/2-Inch Hammer Drill Operator's Manual Operation PRE-OPERATION (CONTINUED): 8. Fixing the side handle (Fig. 3): Loosen the knob bolt on the side handle, and attach the side handle to the gear cover in a position convenient for drilling. Match the projecting part of the handle to the groove on the gear cover, and firmly tighten the knob bolt. To remove the side handle, loosen the knob bolt and rotate the handle. To attach a depth gauge on the side handle, insert the gauge into the U-shaped groove on the side handle, adjust the position of the depth gauge in accordance with the desired depth of the hole, and firmly tighten the wing bolt. 9. IMPACT to ROTATION change over (Fig. 4): The Hammer Drill can be switched from IMPACT (impact plus rotation) to ROTATION (rotation only) by rotating the change lever (Fig. 1). When boring concrete, stone, tile or similar hard materials, rotating the change lever to IMPACT side. The drill head impacts against the material while continuing to rotate. When boring metal, wood or plastic, rotating the change lever to ROTATION side. The drill rotates as an ordinary electric drill. CAUTION: DO NOT USE THE HAMMER DRILL IN THE IMPACT FUNCTION IF THE MATERIAL CAN BE BORED BY ROTATION ONLY. SUCH ACTION WILL NOT ONLY REDUCE DRILL EFFICIENCY, BUT MAY ALSO DAMAGE THE DRILL TIP. NOTE: The change lever may not rotate smoothly when changing from hammer drill mode to drill mode (Fig. 4). In this case, switch ON and operate the machine for few seconds. The spindle shaft will then be pus...