Makita HR3851 User's Manual
Contents
1. 8 Tn kita Rotary Hammer 38 mm 1 1 2 MODEL HR3851 IN IJ 003098 INSTRUCTION MANUAL A WARNING For your personal safety READ and UNDERS TAND before using SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE www makitatools com SPECIFICATIONS e Specifications may differ from country to country GENERAL SAFETY RULES Model Capacities No load speed RPM Blows per minute Overall length Net weight For All Tools A WARNING Read and understand all Carbide tipped bit HR3851 38 mm 1 1 2 118 mm 4 5 8 240 min 2 900 445 mm 17 1 2 7 5 kg 16 5 Ibs Manufacturer reserves the right to change specifications without notice USA001 2 instructions Failure to follow all instructions listed below may result in electric shock fire and or serious personal injury SAVE THESE INSTRUCTIONS Work Area 1 Keep your work area clean and well lit Cluttered benches and dark areas invite acci dents Do not operate power tools in explosive atmospheres such as in the presence of flammable liquids gases or dust Power tools create sparks which may ignite the dust or fumes 3 Keep bystanders children and visitors away while operating a power tool Distrac tions can cause you to lose control Electrical Safety 4 Grounded tools must be plugged into an outlet properly installed and grounded in accordance with all codes and ordi nances Never remove the gro2. Clamp screw 2 Depth gauge 3 Grip base OPERATION 003199 002449 1 Blow out bulb Depth gauge The depth gauge is convenient for drilling holes of uniform depth Insert the depth gauge into the hole in the grip base Adjust the depth gauge to the desired depth and then tighten the clamp screw to secure the depth gauge NOTE e The depth gauge cannot be used at the position where the depth gauge strikes against the tool body Hammer drilling operation Set the change lever to the 81 symbol Position the bit at the desired location for the hole then pull the switch trigger Do not force the tool Light pressure gives best results Keep the tool in position and prevent it from slip ping away from the hole Do not apply more pressure when the hole becomes clogged with chips or particles Instead run the tool at an idle then remove the bit partially from the hole By repeating this sev eral times the hole will be cleaned out and normal drilling may be resumed A CAUTION e There is a tremendous and sudden twisting force exerted on the tool bit at the time of hole break through when the hole becomes clogged with chips and particles or when striking reinforcing rods embedded in the concrete Always use the side grip auxiliary handle and firmly hold the tool by both side grip and switch handle during operations Failure to do so may result in the loss of control of the tool and potentially severe injury Blo
3. The tool will be damaged e To avoid rapid wear on the mode change mechanism be sure that the change lever is always positively located in one of the two action mode positions ASSEMBLY 003146 1 Side grip 2 Grip base 003149 1 Red dot Tool holder 2 Rde dot Tool retainer 003154 1 Tool retainer 2 Turn 180 3 Press in 8 A CAUTION e Always be sure that the tool is switched off and unplugged before carrying out any work on the tool Side grip auxiliary handle For maximum control and safer operation always use the side grip with this tool The side grip swings around to either side allowing easy handling of the tool in any position Loosen the side grip by turning it counterclockwise swing it to the desired position and then tighten it by turning clock wise The side grip can also be installed in the position shown in the figure Remove the side grip from the grip base by turn ing the side grip counterclockwise Screw the side grip on either side of the tool whichever is convenient Installing or removing the bit Press in the tool retainer and turn it until the red dots on the tool retainer and the tool holder are aligned Release the tool retainer Insert the bit into the tool holder as far as it will go Press in the tool retainer and turn it a full 180 degrees Then release it to secure the bit To remove the bit follow the installation procedure in reverse 003183 1
4. 704 527 0611 OHIO 6253 E Main St Columbus OH 43213 614 860 0222 6379 Pearl Road Parma Heights OH 44130 440 843 7555 1617 E Kemper Rd Sharonville OH 45246 513 771 0788 OKLAHOMA 552 E Memorial Road Oklahoma City OK 73114 405 752 2655 OREGON 828 19th Avenue N W Portland OR 97209 503 222 1823 PENNSYLVANIA Springwater Plaza 364 Wilmington W Chester Pike Glen Mills PA 19342 610 459 4122 6200 Babcock Blvd Pittsburgh PA 15237 412 366 6363 PUERTO RICO 200 Guayama St Hato Rey PR 00917 787 250 8776 TENNESSEE 4655 Nolensville Rd Nashville TN 37211 615 331 9922 TEXAS 12801 Stemmons Fwy Ste 809 Farmers Branch TX 75234 972 243 1150 12701 Directors Dr Stafford TX 77477 3701 281 565 8665 3453 IH 35 North Ste 101 San Antonio TX 78219 210 228 0676 UTAH 145 E 1300 S Ste 101 Salt Lake City UT 84115 801 359 3410 VIRGINIA 5760 Northampton Blvd Ste 102 Virginia Beach VA 23455 757 460 0280 WASHINGTON 22220 84th Ave So Bldg A Kent WA 98032 253 395 8055 WISCONSIN Lincoln Plaza Shopping Ctr 2245 S 108th St West Allis WI 53227 414 541 4776 CUSTOMER S RECORD When you need service Send complete tool prepaid to one Makita Service Center Be sure to attach a letter to the outside of the carton detailing the problem with your tool Model No 19 WARNING Some dust created by power sanding sawi
5. or attachments might present a risk of injury to persons Only use accessory or attachment for its stated purpose If you need any assistance for more details regarding these accessories ask your local Makita service center e Spline shank Carbide tipped bits e Bull point e Cold chisel e Scaling chisel e Grooving chisel e Spline shank to A Taper adapter e Spline shank to SDS adapter e Core bit e Core bit adapter e Hammer grease e Depth gauge e Blow out bulb e Safety goggles e Lock nut wrench 35 e Hex wrench e Plastic carrying case Memo 14 Memo Memo 16 A A A A A AO ln lan Dunn A 2 Makita U S A Inc 14930 Northam Street La Mirada CA 90638 5753 A AA a ea MAIL THIS PORTION Your answers to the following questions are appreciated 1 This product was purchased from 3 How did you learn about this product Home Center Other Magazine Radio Hardware Lumber Store From Dealer Exhibition Tool Distributor Newspaper From Friend Industrial Supply Store Display Previous Usage Construction Supply Catalog Other 2 Use of the product is intended for 4 Most favored points are mM Construction Trade u Design Repair Service Industrial Maintenance Features Durability Home Maintenance Size u Power Hobby Price Other Other u Makita Brand 5 Any comments DATE PURCHASED MODEL NO MONTH ae I MR Bu STATUS
6. same manner as a drill bit Rotate the change lever to the Y position Rest the core bit on the concrete and turn the tool on Once the core bit has cut a shallow groove into the concrete rotate the change lever to the T position and resume drilling NOTE e No problem is caused even if the core bit unscrews slightly during brief use since the core bit rotates in the tightening direction To remove the core bit follow the same removal procedures covered in When using the center bit A CAUTION e Always be sure that the tool is switched off and unplugged before attempting to perform inspection or maintenance 11 001146 1 Commutator 2 Insulating tip 3 Carbon brush 003225 1 Hex wrench 2 Rear cover 003231 1 Screwdriver 2 Brush holder cap 003236 1 Lock nut wrench 2 Crank cap 12 Replacing carbon brushes When the resin insulating tip inside the carbon brush is exposed to contact the commutator it will automatically shut off the motor When this occurs both carbon brushes should be replaced Keep the carbon brushes clean and free to slip in the holders Both carbon brushes should be replaced at the same time Use only identical carbon brushes Use a hex wrench to remove the rear cover Use a screwdriver to remove the brush holder caps Take out the worn carbon brushes insert the new ones and secure the brush holder caps Lubrication This tool requires no hourly or d
7. 781 6333 Thompson Center Waters 5501 W Waters Ave Ste 406 Tampa FL 33634 813 886 8292 GEORGIA 4680 River Green Parkway Duluth GA 30096 2566 770 476 8911 HAWAII 4510 Salt Lake Blvd Suite A7 Honolulu HI 96818 808 847 0038 ILLINOIS 1450 Feehanville Dr Mt Prospect IL 60056 6011 847 297 3100 INDIANA 8403 Michigan Road Unit 1 Indianapolis IN 46268 317 334 9980 KANSAS 8819 W 95th St Overland Park KS 66212 913 642 1111 KENTUCKY 1215 S Hurstbourne Parkway Louisville KY 40222 502 326 3740 LOUSIANA 5626 Jefferson Hwy Harahan LA 70123 504 733 4138 MARYLAND 7541 45 Ritchie Highway Glen Burnie MD 21061 410 590 0160 MASSACHUSETTS 232 Providence Hwy Westwood MA 02090 617 461 9754 MICHIGAN 37454 Ann Arbor Trail Livonia MI 48150 313 432 1012 MINNESOTA 6427 Penn Ave South Richfield MN 55423 612 869 5199 MISSOURI 9876 Watson Road St Louis MO 63126 2221 314 909 9889 NEBRASKA 4129 S 84th St Omaha NE 68127 402 597 2925 NEVADA 3375 S Decatur Blvd Suites 22 24 Las Vegas NV 89102 702 368 4277 NEW JERSEY 251 Herrod Blvd Dayton NJ 08810 1539 609 655 1212 NEW MEXICO 5805 Menaul Blvd NE Albuquerque NM 87110 505 881 4619 NEWYORK 4917 Genessee Street Cheektowaga NY 14225 716 685 9503 131 35 31st Ave Flushing NY 11354 718 886 0971 NORTH CAROLINA 3501 G S Tryon St Charlotte NC 28217
8. INTL LAST NAME COMPANY NAME Married Single u STREET ADRESS CITY ZIP CODE BE SURE TO COMPLETE THE CUSTOMER S PORTION OF THIS FORM AND RETAIN FOR YOUR RECORDS Please return this portion by facsimile or mail Facsimile No 714 522 8133 nn FACTORY SERVICE CENTERS 1 800 4 MAKITA RETAIN THIS PORTION FOR YOUR RECORDS ALABAMA 2365 Pelham Parkway Pelham AL 35124 205 620 1791 ARIZONA 3707 E Broadway Rd Ste 6 Phoenix AZ 85040 602 437 2850 ARKANSAS Shackleford Shopping Center 240 South Shackleford Rd Ste C Little Rock AR 72211 501 224 5733 CALIFORNIA 41850 Christy St Fremont CA 94538 5107 510 657 9881 1421 N Clovis Ave Ste 112 Fresno CA 93727 559 252 5166 14930 Northam St La Mirada CA 90638 5753 714 522 8088 1970 Fulton Avenue Sacramento CA 95825 916 482 5197 1440 South E Street San Bernardino CA 92408 909 885 1289 7674 Clairemont Mesa Blvd San Diego CA 92111 858 278 4471 1714 E McFadden Ave Unit M Santa Ana CA 92705 714 667 5066 1565 Winchester B Campbell CA 95008 0501 408 379 0377 16735 Saticoy St Ste 105 Van Nuys CA 91406 818 782 2440 COLORADO 11839 E 51st Ave Denver CO 80239 2709 303 371 2850 CONNECTICUT 508 Spring St Windsor Locks CT 06096 860 292 6405 FLORIDA 620 Douglas Ave Suite 1302 Altamonte Springs FL 32714 407 774 6000 750 East Sample Road Pompano Beach FL 33064 954
9. aily lubrication because it has a grease packed lubrication system It should be relubri cated after every 6 months of operation Send the complete tool to Makita Authorized or Factory Service Center for this lubrication service However if circumstances require that you should lubricate it by yourself proceed as follows Run the tool for several minutes to warm it up Switch off and unplug the tool Remove the crank cap using a Makita lock nut wrench 35 optional accessory Rest the tool on the table with the bit end pointing upwards This will allow the old grease to collect inside the crank housing ACCESSORIES Wipe out the old grease inside and replace with a fresh grease 60 g 2 oz Use only Makita genuine hammer grease optional accessory Filling with more than the spec ified amount of grease approx 60 g 2 oz can cause faulty hammering action or tool failure Fill only with the specified amount of grease Reinstall the crank cap and tighten with the lock nut wrench A CAUTION e Do not tighten the crank cap excessively It is made of resin and is subject to breakage To maintain product SAFETY and RELIABILITY repairs any other maintenance or adjustment should be performed by Makita Authorized or Factory Service Centers always using Makita replacement parts A CAUTION e These accessories or attachments are recommended for use with your Makita tool specified in this manual The use of any other accessories
10. duct gained from repeated use replace strict adherence to rotary hammer safety rules If you use this tool unsafely or incorrectly you can suffer serious personal injury 1 Hold tools by insulated gripping surfaces when performing an operation where the cutting tool may contact hidden wiring or its own cord Contact with a live wire will make exposed metal parts of the tool live and shock the operator Be sure the bit is secured in place before operation Under normal operation the tool is designed to produce vibration The screws can come loose easily causing a breakdown or accident Check tightness 2 Wear ear protectors when using the tool of screws carefully before operation ror nr ponon Proangae ee In cold weather or when the tool has not to high intensity noise can cause hearing A been used for a long time let the tool loss Da warm up for a while by operating it under 3 Wear a hard hat safety helmet safety no load This will loosen up the lubrica glasses and or face shield Ordinary eye or sun glasses are NOT safety glasses It is also highly recommended that you wear a dust mask and thickly padded gloves tion Without proper warm up hammering operation is difficult Always be sure you have a firm footing Be sure no one is below when using the tool in high locations 10 11 Hold the tool firmly with both hands Keep hands away from moving parts Do not leave the tool running Op
11. e tool IN NO EVENT SHALL MAKITA BE LIABLE FOR ANY INDIRECT INCIDENTAL OR CONSEQUENTIAL DAMAGES FROM THE SALE OR USE OF THE PRODUCT THIS DISCLAIMER APPLIES BOTH DURING AND AFTER THE TERM OF THIS WARRANTY MAKITA DISCLAIMS LIABILITY FOR ANY IMPLIED WARRANTIES INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A SPECIFIC PURPOSE AFTER THE ONE YEAR TERM OF THIS WARRANTY This Warranty gives you specific legal rights and you may also have other rights which vary form state to state Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you Some states do not allow limitation on how long an implied warranty lasts so the above limitation may not apply to you Makita Corporation 3 11 8 Sumiyoshi cho Anjo Aichi 446 8502 Japan 883481F063
12. erate the tool only when hand held Do not point the tool at any one in the area when operating The bit could fly out and injure someone seriously 12 13 Do not touch the bit or parts close to the bit immediately after operation they may be extremely hot and could burn your skin Some material contains chemicals which may be toxic Take caution to prevent dust inhalation and skin contact Follow mate rial supplier safety data SAVE THESE INSTRUCTIONS A WARNING MISUSE or failure to follow the safety rules stated in this instruction manual may cause serious personal injury FUNCTIONAL DESCRIPTION 003111 003127 Change lever 2 For hammering only 3 For rotation with hammering A CAUTION e Always be sure that the tool is switched off and unplugged before adjusting or checking function on the tool Switch action A CAUTION e Before plugging in the tool always check to see that the switch trigger actuates properly and returns to the OFF position when released To start the tool simply pull the switch trigger Release the switch trigger to stop Selecting the action mode Rotation with hammering For drilling in concrete masonry etc rotate the change lever to the 81 symbol Hammering only For chipping scaling or demolition operations rotate the change lever to the TP symbol A CAUTION e Do not rotate the change lever when the tool is running under load
13. ng grinding drilling and other construction activities contains chemicals known to the State of California to cause cancer birth defects or other reproductive harm Some examples of these chemicals are e lead from lead based paints e crystalline silica from bricks and cement and other masonry products and e arsenic and chromium from chemically treated lumber Your risk from these exposures varies depending on how often you do this type of work To reduce your exposure to these chemicals work in a well ventilated area and work with approved safety equipment such as those dust masks that are specially designed to filter out microscopic particles 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 material Makita will repair or at our option replace without charge This Warranty does not apply where e repairs have been made or attempted by others e repairs are required because of normal wear and tear e the tool has been abused misused or improperly maintained e alterations have been made to th
14. or storing the tool Such preventive safety measures reduce the risk of starting the tool accidentally Store idle tools out of reach of children and other untrained persons Tools are dangerous in the hands of untrained users Maintain tools with care Keep cutting tools sharp and clean Properly maintained tools with sharp cutting edges are less likely to bind and are easier to control Check for misalignment or binding of moving parts breakage of parts and any other condition that may affect the tools operation If damaged have the tool ser viced before using Many accidents are caused by poorly maintained tools Use only accessories that are recom mended by the manufacturer for your model Accessories that may be suitable for tenance performed by unqualified personnel one tool may become hazardous when used could result in a risk of injury on another tool 24 When servicing a tool use only identical SERVICE replacement parts Follow instructions in the Maintenance section of this manual Use of unauthorized parts or failure to follow Maintenance instructions may create a risk of electric shock or injury USE PROPER EXTENSION CORD Use only three wire extension cords that have three prong grounding type plugs and three pole receptacles that accept the tool s plug Make sure your extension cord is in good condition Replace or repair damaged or worn cord immediately When using an extension cord be sure to use one heav
15. rom moving parts Loose clothes jewelry or long hair can be caught in moving parts Avoid accidental starting Be sure switch is off before plugging in Carrying tools with your finger on the switch or plugging in tools that have the switch on invites accidents Remove adjusting keys or wrenches before turning the tool on A wrench or a key that is left attached to a rotating part of the tool may result in personal injury 13 14 Do not overreach Keep proper footing and balance at all times Proper footing and balance enables better control of the tool in unexpected situations Use safety equipment Always wear eye protection Dust mask non skid safety shoes hard hat or hearing protection must be used for appropriate conditions Ordinary eye or sun glasses are NOT eye protection Tool Use and Care 15 16 17 18 19 20 21 22 Use clamps or other practical way to secure and support the workpiece to a stable platform Holding the work by hand or against your body is unstable and may lead to loss of control Do not force tool Use the correct tool for your application The correct tool will do the job better and safer at the rate for which it is designed Do not use tool if switch does not turn it on or off Any tool that cannot be controlled with the switch is dangerous and must be repaired Disconnect the plug from the power source before making any adjustments changing accessories
16. unding prong or modify the plug in any way Do not use any adaptor plugs Check with a qualified electrician if you are in doubt as to whether the outlet is properly grounded If the tools should electrically mal function or break down grounding provides a low resistance path to carry electricity away from the user Avoid body contact with grounded sur faces such as pipes radiators ranges and refrigerators There is an increased risk of electric shock if your body is grounded Do not expose power tools to rain or wet conditions Water entering a power tool will increase the risk of electric shock Do not abuse the cord Never use the cord to carry the tools or pull the plug from an outlet Keep cord away from heat oil sharp edges or moving parts Replace damaged cords immediately Damaged cords increase the risk of electric shock When operating a power tool outside use an outdoor extension cord marked W A or W These cords are rated for outdoor use and reduce the risk of electric shock Personal Safety 9 10 11 12 Stay alert watch what you are doing and use common sense when operating a power tool Do not use tool while tired or under the influence of drugs alcohol or medication A moment of inattention while operating power tools may result in serious personal injury Dress properly Do not wear loose cloth ing or jewelry Contain long hair Keep your hair clothing and gloves away f
17. w out bulb optional accessory After drilling the hole use the blow out bulb to clean the dust out of the hole 003205 003209 1 Core bit 2 Adapter 003210 1 Center bit 003211 10 Chipping Scaling Demolition Set the change lever to the TP symbol Hold the tool firmly with both hands Turn the tool on and apply slight pressure on the tool so that the tool will not bounce around uncontrolled Pressing very hard on the tool will not increase the efficiency Core bit optional accessory When using the center bit Screw the core bit on the adapter Install the adapter with the core bit in the tool in the same manner as a drill bit Install the center bit Rest the core bit on the concrete and turn the tool on Once the core bit has cut a shallow groove into the concrete remove the center bit Then resume drilling 003213 003215 1 Rod 003216 1 Core bit 2 Adapter 003211 MAINTENANCE To remove the core bit follow the procedures 1 or 2 1 Rotate the change lever to the T position Then rest the core bit on the concrete and turn the tool on The core bit will come loose from the hammering action 2 Hold the adapter with the wrench insert the rod optional accessory into the hole in the core bit and tap with a hammer to unscrew When not using the center bit Screw the core bit on the adapter Install the adapter with the core bit in the tool in the
18. y enough to carry the current your product will draw An undersized cord will cause a drop in line voltage resulting in loss of power and overheating Table 1 shows the correct size to use depending on cord length and nameplate ampere rating If in doubt use the next heavier gage The smaller the gage number the heavier the cord 23 Tool service must be performed only by qualified repair personnel Service or main Table 1 Minimum gage for cord Ampere Ratin Total length of cord in feet P 3 120 V 25 ft 50 ft 100 ft 150 ft AWG GROUNDING INSTRUCTIONS This tool should be grounded 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 120 volts and has a plug that looks like Fig A An adapter Fig B and C is available for connecting Fig A type plugs to two prong receptacles The green colored rigid ear lug etc extending from the adapter must be con nected to a permanent ground such as a properly grounded outlet box SPECIFIC SAFETY RULES NS Blade Fig A El Cover of Grounded Outlet Box Adapter E Grounding Means Fig B USBO10 2 DO NOT let comfort or familiarity with pro
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