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19 mm (3/4") MODEL HR1821
Variable Speed
INSTRUCTION MANUAL
Capacities
No load Blows Overall Net
speed per minute
length weight
Wood Steel Concrete
15" 10" 19"
321 mm 3.1 kg
0 - 3,500
0 ;/A,i:OO
(518") (3/8") (314"
(12-518") (6.8 Ibs)
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IMPORTANT SAFETY INSTRUCTIONS (For All Tools) WARNING: WHEN USING ELECTRIC TOOLS, BASIC SAFE- TY PRECAUTIONS SHOULD ALWAYS BE FOLLOWED TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, AND PER- SONAL INJURY, INCLUDING THE FOLLOWING: READ ALL INSTRUCTIONS. 1. KEEP WORK AREA CLEAN. Cluttered areas and benches invite injuries. 2. CONSIDER WORK AREA ENVIRONMENT. Don’t use power tools in damp lit. Don‘t expose power tools to rain. or wet locations. Keep work area well Don‘t use tool in presenc
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REMOVE ADJUSTING KEYS AND WRENCHES. Form habit of checking to 14. see that keys and adjusting wrenches are removed from tool before turn- ing it on. 15. AVOID UNINTENTIONAL STARTING. Don't carry plugged-in tool with finger on switch. Be sure switch is OFF when plugging in. 16. OUTDOOR USE EXTENSION CORDS. When tool is used outdoors, use only extension cords intended for use outdoors and so marked. 17. STAY ALERT. Watch what you are doing, use common sense. Don't oper- ate tool when you
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For all grounded tools with American type plug. GROUNDING INSTRUCTIONS: This tool should begrounded while in use to protect the operator from electric shock. The tool is equipped with a three-conductor cord and three-prong grounding- type plug to fit the proper grounding-type receptacle. The green (or green and yellow) conductor in the cord is the grounding wire. Never connect the green (or green and yellow) wire to a live terminal. Your unit is for use on 115 volts and has a plug that look
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ADDITIONAL SAFETY RULES 1. Wear a hard hat (safety helmet) and an ear protector if necessary. 2. Be sure the drill bit is secured in place before operation. 3. Under normal operation, the tool is designed to produce vibration. The screws can come loose easily, causing a breakdown or accident. Check tightness of screws carefully before operation. 4. In cold weather or when the tool has not been used for a long time, let the tool warm up for several minutes by operating it under no load.
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HOW TO USE Bit grease 0 Coat the drill bit shank head beforehand with a small amount (about 0.5 - 1 g; 0.02 - 0.04 02.) of bit grease. This chuck lubrication assures smooth action and longer service life. Installing and removing the drill bit To install the drill bit, align protrusion (A) with the red dot, then align the key groove on the drill bit shank with the red dot and insert the drill bit. Now turn the chuck cover 90 degrees. I I Fig. 1 *To remove the drill bit, turn the chuc
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Depth rod .The depth rod is used to drill holes of uniform depth. Loosen the thumb screw set the depth rod to desired position, then tighten the thumb screw. Fig. 4 Handling dust collector 0 Use the dust collector for safe, sanitary overhead operations. Install the drill bit, Dust collector then fix the dust collector on the end by turning and applying pressure. Then secure it by turning the metal retainer clockwise. CAUTION: Empty the dust collector of its contents after drilling
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Switch action Speed control screw Tool speed is increased by increasing pres- , sure on the trigger. To start the tool, simply pull the trigger. Release the trigger to stop. Fig. t .A speed control screw is provided so that tool speed (RPM) can be changed at the fully- pulled trigger position. Turn the speed control screw clockwise (+) for higher speed and counterclockwise (-) for lower speed. CAUTION: Before plugging in the tool, always check to see that the trigger switch actuates
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Blow-out bulb 0 Use the blow-out bulb to clean out the hole. Fig. 10 Anchor setting procedure 0 The drill bit has a red marking which can be used to indicate the anchor length. Use the depth rod when drilling for setting a number of anchors at the same depth. ed marking chor setting tool Put a plug in the tip of Screw in a bolt for an anchor and hammer fastening equipment. it into concrete. Fig. fi Drilling in wood or metal Set the push rod for “rotation only.” Then use the drill c
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MAINTENANCE CAUTION: Always be sure that the tool is switched off and unplugged before attempting to perform inspection and maintenance. Replacing carbon brushes 0 Both carbon brushes should be replaced Insulating tip after about 150 hours of use. When the 77 resin insulating tip inside the carbon brush is exposed to contact the com- mutator, it will automatically shut off the motor. If carbon brushes wear out too quickly, ask Makita Authorized or Factory Service Centers to determin
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Lubrication 0 Lubricate the tool every time after replacing carbon brushes. Run the tool for several minutes to warm it up, then rest the tool on the table with the chuck cover (bit) end pointing toward the ceiling. This will allow the old grease to collect inside the crank housing. After five minutes, take off the crank cap and remove the old grease. Wipe out all grease inside and replace with the fresh supply (30 9). Fig. 16 CAUTION: Filling with more than the specified amount of
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ACC ESSO R I ES CAUTION: These accessories or attachments are recommended for use with your Makita tool specified in this manual. The use of any other accessories or attachments might present a risk of injury to persons. The accessories or attachments should be used only in the proper and intended manner. 0 Taper shank adapter No. 1 0 Blowout bulb Part No. 798131-4 Part No. 7650096 Hex wrench 5 0 Taper shank adapter A Part No. 7832038 Part No. 798176-2 0 Lock nut wrench 28 0 Dust col
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0 Tungsten-carbide tip bits Anchor setting rod (Manual setting) 765014 3 No 25 765015 1 Blt Max drilling Overall Makita anchor only Part No diameter depth lenath Anchor settinq rod 1 0 Anchor setting rod for interior applications 0 Anchors (30 sets per pkg) by tool) (Set I Anchor setting rod Plug for interior applications Anchor outer Overall Thread N~ 1 dyzer I leegmf: 1 Thread 1 k3;g_f; I Part NO. No.2 11 17/16") 30 (1 3/16") W 114'' 10 1318") 798054-6 NO 2 5 12 Ill2") 35 11
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Seo.--19-'84 US 19 mm (3/4") @ma ROTARY HAMMER - Model HR1821 Note: The switch and other part configurations may differ from country to country. 14
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MODEL HR1821 Sep-19-'84 US 'ikM ,,!!D DESCRIPTION ,!:, DESCRIPTION MACHINE ~ 46 1 Seal Holder 1 3 Steel Ball 6 4 2 1 Key 4 47 3 Steel Ball 6 4 48 1 3 1 Cylinder Liner 20 Impact Bolt 4 1 Ball Bearing 3007 49 1 0 Ring 10 1 50 1 0 Ring 10 5 Nut M30 3-36 6 1 Barrel 51 1 Drill Holder 7 1 0 Ring 40 52 2 Key 4 53 1 0 Ring 10 8 1 Flat Washer 30 9 1 Spiral Bevel Gear 26 54 1 0 Ring 10 10 1 Striker 55 1 0 Ring 19 1 56 1 Change Ring 11 0 Ring 16 12 1 0 Ring 16 57 1 Steel Ball 4 fl 13 1
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MAKITA LIMITED ONE YEAR WARRANTY Warranty Policy Every Makita tool is thoroughly inspected and tested before leaving the factory. It is warranted to be free of defects from workmanship and materials for the period of ONE YEAR from the date of original purchase. Should any trouble develop during this one-year period, return the COMPLETE tool, freight prepaid, to one of Makita’s Factory or Authorized Service Centers. If inspection shows the trouble is caused by defective workmanship or mater
