rotary hammer dh 40mr
Contents
1. P Needle Cylinder Lock Spring Lock Sleeve Spring Holder Clutch Spring Clutch Bevel Gear Housing Ass y Stator Ass y Cylinder Crank Case 26 LISTNO E467 TOOL PARTS LIST ROTARY HAMMER HITACHI ELECTRIC 2002 9 30 E1 Model DH 40MR EN Q a PARTS DH 40MR CODE NO DESCRIPTION REMARKS 321 306 FRONT CAP 321 305 GRIP 318 590 STOPPER RING 321 304 NEEDLE HOLDER 321 303 RETAINER SPRING 321 302 SPRING HOLDER A 981 942 SEAL LOCK HEX SOCKET HD BOLT M6X25 321 300 FRONT COVER 956 996 O RING 1AS 60 321 301 OIL SEAL 981 859 URETHANE RING 315 868 URETHANE RING HOLDER 948 131 RETAINING RING FOR D35 SHAFT 600 7DD BALL BEARING 6007DDUAV2S 321 297 BEARING WASHER 313 421 NEEDLE ROLLER D8X20 321 286 RETAINER SLEEVE 313 396 O RING C 321 287 SECOND HAMMER 321 288 DAMPER WASHER 321 289 DAMPER 321 290 DAMPER HOLDER 313 057 NEEDLE PIN D6X6 321 291 CYLINDER 321 298 LOCK SPRING 321 299 LOCK SLEEVE 321 293 SPRING HOLDER B 321 294 CLUTCH SPRING 321 292 STRIKER 986 104 O RING 321 295 CLUTCH 321 284 PISTON 980 708 PISTON PIN 321 285 CONNECTING ROD 321 296 BEVEL GEAR 986 940 SEAL LOCK HEX SOCKET HD BOLT M6X45 983 162 SEAL LOCK HEX SOCKET HD BOLT M4X12 HITACHI LABEL 321 315 CRANK COVER HITACHI LABEL 321 314 RUBBER SEAL 939 540 RETAINING RING FOR 010 SHAFT 10 PCS 321 275 CRANK SHAFT 9442. DH 40MR HITACHI POWER TOOLS TECHNICAL DATA ROTARY HAMMER AND DH 40MR SERVICE MANUAL LIST No E467 Sep 2002 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT REMARK Throughout this TECHNICAL DATA AND SERVICE MANUAL a symbol s is are used in the place of company name s and model name s of our competitor s The symbol s utilized here is are as follows Competitors Symbols Utilized Company Name Model Name B BOSCH GBH5 40DE D HILTI TE55 C MAKITA HR4000C 9 CONTENTS il PRODUCT aaa aaa aa aaa aia Ca una aaa pasay Sus 1 2 MARKETING OBJECTIVE lll uuu u U u u uu uuu d u aa nena DD aaa a pa aaaa aa sade a ana 1 3 APPLICATIONS 1 zz lcylolgc 1 4 1 Selling Point Descriptions snanar aaa ana 2 5 SPECIFICATIONS uuu cea ol Da tee aa ol Da d aaa iau iti 3 5 1 SPECITICatiIONS ns ici tata ba at a 3 5 2 Optional Accessories uU ca 4 6 COMPARISONS WITH SIMILAR PRODUCTS u 8 6 1 Specification COmbpaLrisOnS e e a a i ae a aa a a 8 6 2 Drilling Speed GompariSOns ba a a a a la i dt 9 6 3 Chiseling Performance Comparison nenea nana na
3. Gear holder Needle pin Gear holder dy Bevel pinion DELE A A A Gear holder groove Cross section A A Fig 7 O Tool holder The tool inlet is covered with the front cap made of rubber to prevent chips from entering inside Two needle rollers fall into the round groove of the drill bit to retain the Tool working tool and three key rails transmit the rotation torque To attach a working tool align the groove positions turning the working tool Needle roller 2 pieces then insert the working tool into the hole until Forward Backward it contacts the innermost end of the hole Releasing the grip reverts the grip and secures the tool in place To remove the tool fully pull the grip backward and pull out the Front cap Grip tool Fig 8 Key rail 3 pieces Fig 8 15 O Handle and side handle The handle section is of a two layer structure The base is made of glassfiber reinforced plastic and the outside layer is soft resin They are molded in one piece The side handle also has a two layer structure The base is made of glassfiber reinforced plastic base with a steel nut and the outside layer is soft resin They are molded in one piece The newly designed handle and side handle structure ensures more comfortable grip for improved operability O Sealing and dust proof structure The cylinder crank case section is tightly sealed with three o rings three oil seals and rubber
4. Neutral and Hammering only The Model DH 40MR is equipped with a needle pin type slip clutch for higher slip torque accuracy and enhanced safety same as the Model DH 40MA The Model DH 40MR provides three functions rotation hammering function for drilling neutral function for positioning the tool tip and hammering only function for chiseling and chipping These function modes can be easily switched by using the change lever The tool angle can be easily changed in 12 steps by turning the grip with the change lever positioned at Neutral 4 1 7 Needle pin type slip clutch 5 SPECIFICATIONS 5 1 Specifications Drill bit Max diameter 40 mm 1 9 16 Core bit Max diameter 105 mm 4 1 8 Capacity Power source AC single phase 50 Hz or 60 Hz Voltage 110 V 120 V 220 V 230 V 240 V Current 10 A 9 2 A 5A 4 8 A 4 6 A Power input 950 W Motor type AC single phase series commutator motor Insulation structure Double insulation Enclosure Materials Aluminum alloy die casting Nylon resin Handle handle cover tail cover and crank cover Paint Silver green metallic black Switch Trigger switch Type of handles D shaped handle and side handle Rotation rate No load and full load 240 to 480 min Impact rate No load and full load 1 320 to 2 650 min Weight Product 6 5 kg 14 3 Ibs excluding cord and side handle Packed 10 0 kg 22 1
5. 47 Ball Bearing 6203DDCMPS2L 46 Retaining Ring for D40 Hole 45 Crank Shaft 43 Steel bar Fig 20 2 Reassembly of the piston Insert the Piston Pin 33 into the 8 mm dia hole marked side of the Piston 32 and the Connecting Rod 34 then press fit it Mount the O ring 30 to the Piston 32 Be careful not to protrude the Piston Pin 33 from the outside diameter of the Piston 32 Move the crank pin of the Crank Shaft 43 to the bottom dead center and mount the piston assembly to the Crank Shaft 43 from the front cover side of the Cylinder Crank Case 49 Mount the Retaining Ring for D10 Shaft 42 using a retaining ring puller Fig 21 20 Retaining Ring Cylinder Crank Case 49 for D10 Shaft 42 Crank Pin Piston Pin 33 Crank Shaft 43 Connecting Rod 34 O ring 30 piston 32 Fig 21 3 Reassembly of the cylinder and the retainer sleeve Press fit the Retainer Sleeve 17 into the Ball Bearing 6007DDUAV2S 14 Secure it with the Retaining Ring for D35 Shaft 13 Mount the Second Hammer 19 Damper Washer 20 Damper 21 and Damper Holder 22 to the Retainer Sleeve 17 Mount the Damper Washer 20 aligning the R surface of the inside diameter with the R surface of the Second Hammer 19 Insert the Striker 29 into the Cylinder 24 then insert the Cylinder 24 into the Retainer Sleeve 17 Secure the Cylinder 24 and the Retainer Sleeve 17 with the four N
6. 608 VVM BALL BEARING 608VVC2PS2L 318 721 MAGNET 321 313 SEAL LOCK HEX SOCKET HD BOLT M6X22 935 829 BRUSH CAP 999 073 CARBON BRUSH AUTO STOP TYPE 1 PAIR 999 043 CARBON BRUSH 1 PAIR 971 001 BRUSH HOLDER 938 477 HEX SOCKET SET SCREW M5X8 321 321 TAIL COVER 877 839 SEAL LOCK HEX SOCKET HD BOLT M5X10 9 02 ALTERNATIVE PARTS q e INCLUD 44 50 51 53 61 INCLUD 80 81 86 87 INCLUD 96 INCLUD 96 INCLUD 96 INCLUD 96 FOR HKG INCLUD 96 FOR HKG IN alado dd dy k k dd dd do lt lt lt do do k lt do do do lt lt PARTS CODE NO 930 703 DESCRIPTION BRUSH TERMINAL REMARKS DH 40MR 321 322 VINYL TUBE 321 318 HOUSING ASS Y INCLUD 92 93 321 317 CASE B 321 326 321 328 CONTROLLER CIRCUIT 110V CONTROLLER CIRCUIT 120V 321 327 CONTROLLER CIRCUIT 220V 240V 317 113 INTERNAL WIRE EXCEPT FOR HKG USA CAN 321 323 HANDLE 998 485 313 093 HEX SOCKET HD BOLT W FLANGE M5X14 SWITCH C 2P SCREW TYPE W O LOCK 321 324 HANDLE COVER 301 653 TAPPING SCREW W FLANGE D4X20 BLACK SDS MAX LABEL 980 063 NAME PLATE TERMINAL 930 804 TERMINAL M4 0 10 PCS FOR USA CAN 981 373 TUBE D FO
7. 90 105 Cote bit ole MET SS 4 1 8 4 1 8 3 17 32 4 1 8 Power input W 950 950 1 100 900 900 Impact energy per stroke J 10 8 8 5 7 7 Full load rotation rate min 240 480 oe 0 340 0 480 230 450 Full load impact rate 1 320 2 650 1 m 0 3 300 0 2 630 1 250 2 500 Full load vibration level dB VL 118 0 119 8 116 1 118 5 Full load noise level dB A 94 6 93 7 93 2 93 5 No load noise level dB A 87 9 85 0 83 0 80 3 444 450 440 455 17 1 2 17 23 32 17 11 32 17 15 16 I 255 255 250 Dimensions Height mm 4093 64 9 15 16 10 3 64 9 1 16 9 27 32 102 90 104 Width mm 4 1 16 4 1 64 3 17 32 4 1 8 eee 6 5 6 6 6 2 5 9 6 2 Weight 14 3 14 6 lbs 13 7 lbs 13 0 Ibs 13 7 Ibs Insulation structure Double Double Double Double insulation insulation insulation insulation insulation Weight does not include cord and side handle 6 2 Drilling Speed Comparisons Drilling speed varies considerably depending on the work conditions Use the factory test results shown in Fig 1 for comparison purposes only _Drilling speed mm min L Dia mm HITACHI DH40MR 360 HITACHI DH40MA MB E ae gt 335 16 PURUS PPI 320 HITACHI HITACHI 19 HITACHI HITACHI 22 HITACHI HITACHI 25 HITACHI HITACHI 28 HITACHI HITACHI 32 HITACHI HITACHI 38 HITACHI HITACHI 40 Note that the data marked with asteris
8. Code No 11 7 6 944460 12 3 15 32 944461 12 7 1 2 993038 14 3 9 16 944462 Morse taper No 1 313464 944477 14 5 9 16 944500 17 5 11 16 944463 2 SDS plus shank bit adapter ETE CO 1 Drill bit SDS plus shank 2 SDS plus shank bit adapter SDS max shank Code No 313465 3 Boring work for large diameter holes Rotation Hammering 0 1 Guide plate 3 Core bit 4 Core bit shank SDS max shank 2 Center pin 1 Guide plate Core bits with outer diameter of 32 35 38 45 50 54 60 64 70 75 79 94 100 105 mm 1 1 4 1 3 8 1 1 2 1 3 4 2 2 1 8 2 3 8 2 2 1 2 3 4 2 15 16 3 1 8 3 1 16 3 15 16 4 1 8 Guide plate is not used with core bits with outer diameter of 25 mm 1 and 29 mm 1 1 8 2 Center pin e Code No 956009 for core bits with outer diameter of 32 35 mm 1 1 4 1 3 8 e Code No 955165 for core bits with outer diameter of 38 45 50 54 60 64 70 75 79 94 100 105 mm 1 1 2 1 3 4 2 2 1 8 2 3 8 2 1 2 2 3 4 2 15 16 3 1 8 3 11 16 3 15 16 4 1 8 Center pin is not used with core bits with outer diameter of 25 mm 1 and 29 mm 1 1 8 3 Core bit Outer diameter mm Code No Outer diameter mm Code No Outer diameter mm Code No 25 1 955994 50 2 959706 79 3 1 8 955157 29 1 1 8 955995 54 2 1 8 955155 94 3 11 16 956004 32
9. Ibs Packaging Corrugated cardboard box with plastic tool case Standard accessories Plastic Gace setarea he a ee inteso at ae a ta LI 1 e Side handle eese Henne 1 e bar wrench for M6 eee 1 e bar wrench for 5 eH eee 1 e Hex bar wrench for meme eee eee 1 Stopper 1 e Grease A eee t 1 5 2 Optional Accessories 1 Drilling work for through holes Rotation Hammering 1 Drill bit SDS max shank Outer diameter Over length Code No Outer diameter Over length Code No mm mm mm mm 16 5 8 340 13 3 8 313448 16 5 8 540 21 1 4 313456 19 3 4 340 13 3 8 313449 19 3 4 540 21 1 4 313457 22 7 8 320 12 5 8 313450 22 7 8 520 20 15 32 313458 25 1 320 12 5 8 313451 25 1 520 20 15 32 313459 28 1 1 8 370 14 9 16 313452 28 1 1 8 570 22 7 16 313460 32 1 1 4 370 14 9 16 313453 32 1 1 4 570 22 7 16 313461 38 1 1 2 370 14 9 16 313454 38 1 1 2 570 22 7 16 313462 40 1 9 16 370 14 9 16 313455 40 1 9 16 570 22 7 16 313463 2 Drilling work for anchor holes Rotation Hammering 1 Drill bit Taper shank El Cem 1 Drill bit taper shank 2 Taper shank adapter SDS max shank Mr 3 Cotter 1 Drill bit Taper shank 2 Taper shank adapter 3 Cotter Outer diameter mm Code No Taper dimension Code No
10. hammer and rotary hammer to the inner circumference of the Connecting Rod 34 the O rings 30 of the Striker 29 and the Piston 32 the sliding portion of the Second Hammer 19 the Oil Seal 10 Oil Seal A 52 Oil Seal B 48 the Damper 21 and inner and outer circumferences of the Bevel Gear 35 Fill 50 g of the special grease in the Cylinder Crank Case 49 on the Connecting Rod 34 side and 20 g in the Cylinder Crank Case 49 on the Clutch 31 side Apply Hitachi Motor Grease No 29 to the Needle Bearing M661 65 the pinion portion of the Armature 82 and the Needle Roller D8 x 20 16 Fill 30 g of the Hitachi Motor Grease No 29 in the Cylinder Crank Case 49 on the First Gear 64 side and the Gear Cover 66 side 22 7 Oil seal and others Take care not to scratch or cut Oil Seal A 52 and Oil Seal B 48 of the Cylinder Crank Case 49 Oil Seal 10 and O ring 1AS 60 9 of the Front Cover 8 O ring C 18 of the Second Hammer 19 Rubber Seal 41 of the Crank Cover 39 and the O ring 30 of the Piston 32 and the Striker 29 9 3 Screw Locking Agent TB1401 Apply screw locking agent TB1401 to all hex socket head bolts M4 M5 and M6 Note Be sure to apply screw locking agent ThreeBond TB1401 to the threads during reassembly as the bolts loosened with vibration may cause damage to the tool body 9 4 Tightening Torque Front cover mounting bolts L aasan 13 7 99 N
11. of grease It is not necessary to replenish the grease unless the tool is disassembled for repair or there is grease leakage due to a damaged seal The striking portion uses special grease To change the grease in the striking portion inside the cylinder crank case carefully wipe the old grease off the parts and re lube with 50 g 1 8 oz into the cylinder crank case connecting rod side Take care not to overfill the grease as an excessive amount of grease can cause hammer failure The speed reduction portion inside the gear cover uses Hitachi Motor Grease No 29 The proper supply volume is 30 g 1 oz Never use the striking portion special grease in the speed reduction portion Special grease would leak into the motor portion and cause subsequent trouble Periodically replenish the inside of the slip clutch with Hitachi Motor Grease No 29 to the full 8 2 O Ring Replacement The O rings mounted on the striker and piston are extremely important to ensure adequate sealing of the air pressure Although the O rings are made of special rubber to give them a long service life they do nonetheless become worn and should be replaced by new ones periodically depending on frequency of use of the tool With average use it is recommended that the O rings be replaced at least every six months to ensure maximum effectiveness 8 3 Structure of DH 40MR Rotary Hammer Second Air chamber hammer Bevel gear Crank shaft Connecting rod Pist
12. the air chamber O Mechanism to prevent idle hammering The arrangement against idle hammering of this rotary hammer is about the same as for the DH 40MA in which when the drill bit or bull point is not longer pressed against the concrete or similar material the second hammer moves to a position shown in Fig 6 so that the striker is displaced from its hammering position This opens the air hole so that piston movement causes no change in air pressure chamber thus stopping the hammering action Second hammer Striker Air chamber Air hole Second hammer striker movements distance Fig 6 14 O Slip clutch mechanism The slip clutch mechanism is described below with reference to Fig 7 The bevel pinion and the gear holder are coupled together by the key and press fitting Spring C and needle pins are housed in elongated grooves of the gear holder The needle pin is pressed against the inner face of second gear by spring C to allow idle rotation of the second gear relative to the gear holder When an excess torque is exerted on the bevel pinion shaft the needle pin is raised upon the projection of the second gear against the load of spring C to allow idle rotation of the second gear With the arrangement the clutch slips when an excessive torque is applied to the working tool as when the drill bit contacts steel bar wire in the concrete protecting the operator from unexpected motion of the side handle Bevel pinion
13. 0MR Tool shake is not heavy in whole range Good feeling DH 40MA DH 40 MB Tool shakes heavily at pushing force 50 N B Tool shakes heavily at pushing force 50 N and 75 N D Tool shake is not heavy in whole range but the drilling speed is slow and the feeling is not good Drilling speed mm min i Normal pushing force range 50 60 70 80 90 100 110 120 130 Pushing force N Fig 3 240 6 5 Drilling Speed and Quantity of Body Jumping SA Pushing force 100 N The graph shown in Fig 4 illustrates the relationship between drilling speed and quantity of body jumping The quantity of body jumping is less than the similar products and the working tool quickly penetrates into the workpiece Ratio of quantity of body jumping Ratio of drilling speed Body jumping is low Tool shake is low Working tool quickly penetrates into the workpiece gt Self drilling 100 Quantity of body jumping is low and the tool smoothly penetrates into the 150 workpiece with good feeling id 7 PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model DH 40MR Rotary Hammer by all of our customers it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes the importance of the contents of the Handling Instructions and fully understands the meaning of the precautions
14. 1 1 4 955996 60 2 3 8 959707 100 3 15 16 959710 35 1 3 8 955998 64 2 1 2 956002 105 4 1 8 955159 38 1 1 2 956000 70 2 3 4 959708 45 1 3 4 955154 75 2 15 16 959709 4 Core bit shank SDS max shank e Code No 313466 for core bits with outer diameter of 25 29 32 35 mm 1 1 1 8 1 1 4 1 3 8 e Code No 313467 for core bits with outer diameter of 38 45 50 54 60 64 70 75 79 94 100 105 mm 1 1 2 1 3 4 2 2 1 8 2 3 8 2 1 2 2 3 4 2 15 16 3 1 8 3 11 16 3 15 16 4 1 8 4 Hole drilling For drilling steel and wood s 1 13 mm drill chuck 2 Chuck adapter 13VLA SDS max shank a 3 Chuck wrench 1 13 mm drill chuck 13VLA 2 Chuck adapter 3 Chuck wrench Code No 950272 Code No 313468 Code No 930515 5 Chemical anchor holes drilling work Rotation Hammering FD Socket 1 Chemical anchor adapter SDS max shank Socket square size Code No 12 7 mm 1 2 313469 19 0 mm 3 4 313470 6 Demolition work Hammering 1 Bull point SDS shank Overall length Code No 280 mm 11 313471 400 mm 15 3 4 313472 7 Grooving and edging Hammering Ss 1 Cold chisel SDS max shank Overall length Code No 280 mm 11 313473 400 mm 15 3 4 313474 8 Cutti
15. 109 FEATHER KEY 3X3X8 948 391 RETAINING RING FOR D40 HOLE 620 3DD BALL BEARING 6203DDCMPS2L 996 363 O RING S 40 321 274 OIL SEAL B 321 273 CYLINDER CRANK CASE 321 278 BEVEL PINION 321 279 COLLAR E ALTERNATIVE PARTS 9 02 O ojo BAJO BPI PARTS DH 40MR CODE NO DESCRIPTION REMARKS 313 050 JOIL SEAL A 600 2DD BALL BEARING 6002DDCMPS2L 313 058 WASHER 313 053 WASHER A 321 281 GEAR HOLDER 321 282 SPRING C 320 343 NEEDLE 321 280 SECOND GEAR 321 283 SPACER 629 VVM BEARING 629VVC2PS2L 321 277 SLIP CLUTCH ASS Y 944 525 BEARING WASHER C 321 276 FIRST GEAR 939 299 NEEDLE BEARING M661 321 319 GEAR COVER 313 078 SIDE HANDLE 313 079 HANDLE HOLDER 313 080 HANDLE BOLT 971 786 STOPPER ROD LEVER LABEL 321 309 CHANGE LEVER 321 308 LEVER HOLDER 311 229 RETAINING RING FOR D20 HOLE 321 307 LEVER SHAFT 873 095 O RING P 16 321 310 LEVER SPRING 321 311 PUSHING BUTTON 321 312 PIN D2X10 620 1DD BALL BEARING 6201DDCMPS2L 302 429 DUST WASHER 360 591U ARMATURE ASS Y 110V 120V 360 591E ARMATURE 220V 230V 360 591F ARMATURE 240V 321 320 FAN GUIDE 953 174 HEX HD TAPPING SCREW D5X55 340 542C STATOR ASS Y 110V 340 542G STATOR ASS Y 120V 340 542E STATOR ASS Y 220V 230V 340 542H STATOR ASS Y 220V 340 542F STATOR ASS Y 240V 982 631 WASHER A
16. 9 Remove the Retaining Ring for D10 Shaft 42 using a retaining ring puller and remove the Connecting Rod 34 from the Crank Shaft 43 Fig 16 18 Retainer Sleeve 17 Lock Sleeve 26 Clutch 31 Cylinder 24 Bevel Gear 35 Connecting Rod 34 Second Hammer 19 Striker 29 Cylinder Crank Case 49 mS Fh Bevel Pinion 50 IL Crank Shaft 43 Fig 16 3 Disassembly of the first gear and the crank shaft Cylinder Crank Case Remove grease from the Connecting Rod 34 side and 49 the First Gear 64 side of the Cylinder Crank Case 49 Remove the Retaining Ring for D40 Hole 45 from the Ball Bearing 6203DDCMPS2L 46 using a retaining ring puller At this time shift the position of the Hole of Retaining Ring for D40 Hole 45 crank pin of the Crank Shaft 43 as shown in Fig 17 so 45 that the hole of the retaining ring can be seen before Crank Shaft 43 removal Face the Connecting Rod 34 side of the Cylinder Crank Case 49 downward and place it ona support Press the end surface of the Crank Shaft 43 Fig 17 with a hand press to remove the First Gear 64 and the 1 Press the end surface of the Crank Shaft 43 Fig 18 ib Crank Shaft 43 with a hand press Crank Shaft 43 bouta First Gear 64 Cylinder Crank Case 49 19 4 Disassembly of the slip clutch Press the end surface of Remove the Ball Bearing 629VVC2PS2L 61 with a the Be
17. Megohm Tester Dielectric strength AC 4 000 V 1 minute with no abnormalities 220 V 240 V and 110 V for U K products 2 500 V 1 minute with no abnormalities 110 V 127 V except U K products 9 7 No load Current Value After no load operation for 30 minutes the no load current value should be as follows Voltage V 110 120 220 230 240 Current A Max 6 4 5 9 3 2 3 1 2 9 95 10 STANDARD REPAIR TIME UNIT SCHEDULES MODEL Variable Fixed 10 20 30 40 50 60 min General Assembly Work Flow Handle Cover Switch C Cord Tail Cover Crank Cover Rubber Seal Front Cap Grip Needle Holder Retainer Spring Spring Holder A O ring Lever Shaft Lever Holder Change Lever Lever Spring Pushing Button Front Cover O ring 1AS 60 Oil Seal Urethane Ring Urethane Ring Holder Ball Bearing 6007DD Bearing Washer Needle Roller Retainer Sleeve O ring C Second Hammer Damper Washer Damper Damper Holder Handle Controller Circuit Striker O ring x 2 Piston Piston Pin Connecting Rod Gear Cover Needle Bearing Armature Ball Bearing 6201DD Ball Bearing 608VV Washer A Dust Washer B Crank Shaft Ball Bearing 6203DD Oil Seal B O ring First Gear Slip Clutch Ass y
18. ORE BIT 79MM 955 168 GUIDE PLATE FOR CORE BIT 79MM 956 004 CORE BIT 94MM 956 005 GUIDE PLATE FOR CORE BIT 94MM 955 159 CORE BIT 105MM 955 169 GUIDE PLATE FOR CORE BIT 105MM 956 009 CENTER PIN 147L FOR CORE 032 35 955 165 CENTER PIN A 133L FOR CORE BIT D38 150 313 466 CORE BIT SHANK B SDS MAX 025 35 313 467 CORE BIT SHANK A SDS MAX 038 150 950 272 DRILL CHUCK 13VLA 930 515 CHUCK WRENCH 10G 313 468 CHUCK ADAPTER SDS MAX 313 469 CHEMICAL ANCHOR ADAPTER SDS MAX 12 7MM 313 470 CHEMICAL ANCHOR ADAPTER SDS MAX 19MM 313 471 BULL POINT SDS MAX 280L 313 472 BULL POINT SDS MAX 400L 313 473 COLD CHISEL SDS MAX 280MM 313 474 COLD CHISEL SDS MAX 400MM 313 475 CUTTER SDS MAX W50X400L 313 476 SCOOP SDS MAX 400L 313 478 RAMMER SDS MAX 150MM X 150MM 313 477 BUSHING TOOL SDS MAX 313 479 SHANK SDS MAX FOR RAMMER BUSHING TOOL 320 859 SYRINGE BLOW OUT BULB TYPE 318 085 SYRINGE BELLOWS TYPE 308 471 GREASE FOR HAMMER HAMMER DRILL 70G 980 927 GREASE FOR HAMMER HAMMER DRILL 500G INCLUD 635 INCLUD 637 INCLUD 639 INCLUD 641 INCLUD 643 INCLUD 645 INCLUD 651 do do do fado do do ado fado ld fado do fado 6 ALTERNATIVE PARTS Printed in Japan 9 02 020930N Hitachi Koki Co Lt
19. R CORD 958 049 CORD ARMOR D8 2 940 778 959 141 CORD ARMOR D10 7 CONNECTOR 50092 10 PCS FOR HKG 938 307 PILLAR TERMINAL EXCEPT FOR HKG 960 266 CORD CLIP 981 987Z CORD CLIP FOR SUI 984 750 500 390Z TAPPING SCREW W FLANGE D4X16 CORD ARMOR D10 7 500 446Z CORD ARMOR D10 7 FOR GBR 230V 500 454Z CORD ARMOR D10 7 FOR GBR 110V 500 435Z CORD ARMOR D8 2 FOR HKG 500 391Z 500 408Z CORD ARMOR D10 7 FOR SUI CORD ARMOR D8 2 FOR NZL 500 439Z CORD ARMOR D8 2 FOR AUS 500 434Z do fado eS 8 do fado do gt LG L CORD ARMOR D10 7 FOR USA CAN ALTERNATIVE PARTS STANDARD ACCESSORIES DH 40MR CODE NO DESCRIPTION REMARKS 321 325 CASE 981 840 GREASE A FOR HAMMER HAMMER DRILL 30G 943 277 HEX BAR WRENCH 3MM 944 458 BAR WRENCH 4MM 944 459 BAR WRENCH 5MM OPTIONAL ACCESSORIES CODE NO DESCRIPTION REMARKS 313 448 DRILL BIT SDS MAX D16X340 313 456 DRILL BIT SDS MAX D16X540 313 449 DRILL BIT SDS MAX D19X340 313 457 DRILL BIT SDS MAX D19X540 313 450 DRILL BIT SDS MAX D22X320 313 458 DRILL BIT SDS MAX D22X520 313 451 DRILL BIT SDS MAX D25X320 313 459 DRILL BIT SDS MAX D25X520 313 452 DRILL BIT
20. SDS MAX D28X370 313 460 DRILL BIT SDS MAX D28X570 313 453 DRILL BIT SDS MAX D32X370 313 461 DRILL BIT SDS MAX D32X570 313 454 DRILL BIT SDS MAX D38X370 313 462 DRILL BIT SDS MAX D38X570 313 455 DRILL BIT SDS MAX D40X370 313 463 DRILL BIT SDS MAX D40X570 944 460 TAPER SHANK DRILL BIT D11X100 944 461 TAPER SHANK DRILL BIT D12 3X110 993 038 TAPER SHANK DRILL BIT D12 7X110 944 462 TAPER SHANK DRILL BIT D14 3X110 944 500 TAPER SHANK DRILL BIT D14 5X110 944 463 TAPER SHANK DRILL BIT D17 5X120 313 464 TAPER SHANK ADAPTER ASS Y SDS MAX NO 1 944 477 COTTER 313 465 ADAPTER SDS MAX FOR SDS PLUS SHANK BIT 955 994 CORE BIT 25MM 955 995 CORE BIT 29MM 955 996 CORE BIT 32MM 955 997 GUIDE PLATE FOR CORE BIT 32MM 955 998 CORE BIT 35MM 955 999 GUIDE PLATE FOR CORE BIT 35MM 9 02 ALTERNATIVE PARTS 5 INCLUD 624 INCLUD 629 fm a o mk INCLUD 631 OPTIONAL ACCESSORIES DH 40MR CODE NO DESCRIPTION REMARKS 956 000 CORE BIT 38MM INCLUD 633 956 001 GUIDE PLATE FOR CORE BIT 38MM 955 154 CORE BIT 45MM 955 166 GUIDE PLATE FOR CORE BIT 45MM 955 155 CORE BIT 54MM 955 167 GUIDE PLATE FOR CORE BIT 54MM 956 002 CORE BIT 64MM 956 003 GUIDE PLATE FOR CORE BIT 64MM 955 157 C
21. ary Hammer Model DH 40MR 2 MARKETING OBJECTIVE The Model DH 40MR is an upgraded version of the current Models DH 40MA and DH 40MB which feature the use of SDS max shank tools The performance durability and operability are greatly improved With this competitive Model DH 40MR we aim to enhance the share of SDS max type rotary hammers The main specifications are as follows 1 High drilling speed with low vibration and noise level 2 Self drilling Good feeling 3 Internal double insulation construction with sturdy aluminum frame 4 Constant speed with variable speed control 5 6 7 Soft touch grip for easier handling Variabel lock mechanism for easy working angle adjustment of chisels etc oo A very original design 3 APPLICATIONS e Drilling holes in concrete and drilling anchor holes e Demolishing and chiseling of concrete Edging gravel road digging compacting and tamping grooving cutting stripping and roughing etc Application examples e Air conditioning e Piping and wiring e Electric fixtures e Sanitary facilities e Interior finishing e Other building construction and repair work 4 SELLING POINTS e High drilling speed with low vibration and noise level e Self drilling Good feeling e A very original design Soft touch grip handle Change lever for switching between Rotation for easier handling Hammering for drilling Neutral for positionin
22. d
23. e manually turned and the working tool for chiseling or chipping is adjustable to the desired position in 12 steps easily Fig 12 Figure 13 is likewise a cross sectional view showing the Hammering only mode With the change lever turned another 90 the splines on the inner circumference of the lock sleeve come into mesh with the splines on the outer circumference of the clutch so that the cylinder as well as the working tool are prevented from rotating Although the Model DH 40MR has three selectable modes as mentioned above use of a working tool for chipping or chiseling in the Rotation Hammering mode will result in an accident Be sure to instruct the customers to select the Hammering only mode when doing chiseling or chipping work Grip Fig 12 17 9 REPAIR GUIDE The numbers in Bold correspond to the item numbers in the Parts List and exploded assembly diagrams 9 1 Disassembly p 1 Disassembly of the tool holder Pull the Grip 2 in the arrow direction to the full as shown in Fig 14 Remove the Front Cap 1 Front Cap 1 is made of rubber and fitted securely Pull the Front Cap 1 forcefully to remove Thus the Grip 2 can be removed from the Retainer Sleeve 17 Front Cap 1 Grip 2 Fig 14 Stopper Ring 3 Needle Holder 4 E il Needle Roller 16 Retainer Spring 5 Spring Holder A 6 Fig 15 Remove the Stopper Ring 3 using a retaining ring puller Then the Ne
24. edle Holder 4 two Needle Rollers D8 x 20 16 Retainer Spring 5 and Spring Holder A 6 can be removed from the Retainer Sleeve 17 Fig 15 2 Disassembly of the piston and the striker Remove the Seal Lock Hex Socket Hd Bolt M4 x 12 37 from the Crank Cover 39 then remove the Crank Cover 39 from the Cylinder Crank Case 49 Remove the Seal Lock Hex Socket Hd Bolt M6 x 45 36 and Seal Lock Hex Socket Hd Bolt M6 x 22 89 Remove the Gear Cover 66 from the Cylinder Crank Case 49 Remove the Bevel Pinion 50 slip clutch from the Cylinder Crank Case 49 otherwise Bevel Gear 35 cannot be removed later Remove the Seal Lock Hex Socket Hd Bolt M4 x 12 37 from the Change Lever 72 then remove the Change Lever 72 Remove the Retaining Ring for D20 Hole 74 using a retaining ring puller and remove the Lever Shaft 75 otherwise Bevel Gear 35 cannot be removed later Remove the Seal Lock Hex Socket Hd Bolt M6 x 25 7 from the Front Cover 8 Then the Retainer Sleeve 17 Front Cover 8 Lock Sleeve 26 Lock Spring 25 Second Hammer 19 Clutch 31 Clutch Spring 28 Cylinder 24 etc can be removed from the Cylinder Crank Case 49 in an assembly state Remove the Bevel Gear 35 from the Cylinder Crank Case 49 by tapping the Front Cover 8 side with a plastic hammer Remove the Striker 29 from the Cylinder 24 by tapping with a plastic hammer The Piston 32 remains in the Cylinder Crank Case 4
25. eedle Pins D6 x 6 23 and cover it with Spring Holder B 27 Mount the Bearing Washer 15 Lock Spring 25 Lock Sleeve 26 Clutch Spring 28 Clutch 31 and Bevel Gear 35 to the Cylinder 24 Mesh the claw of the Lock Sleeve 26 with the claw of the Clutch 31 Insert the retainer sleeve assembly into the Cylinder Crank Case 49 aligning the spline of the Lock Sleeve 26 with the spline groove at the inner circumference of the Cylinder Crank Case 49 If the slip clutch assembly and the Lever Shaft 75 are mounted in the Cylinder Crank Case 49 first the Bevel Gear 35 will be an obstacle to reassembly Before mounting the slip clutch assembly and the Lever Shaft 75 mount the retainer sleeve assembly to the Cylinder Crank Case 49 Fig 22 Damper Retainer Sleeve 17 Washes 20 Lock Spring 25 Lock Sleeve 26 Striker 29 Clutch 31 Bevel Gear 35 Second Hammer 19 Cylinder 24 N Se ES a Jar Sg ta Cylinder Crank 49 for D35 Shaft 13 Clutch Ball Bearing Spring 28 6007DDUAV2S 14 Damper 21 Bearing Damper Holder 22 Washer 15 Needle Pin D6 x 6 23 Spring Holder B 27 Fig 22 Zopa 4 Reassembly of the slip clutch Press fit the Bevel Pinion 50 into the Collar 51 and the Ball Bearing 6002DDCMPS2L 53 then insert it into the Washer 54 and Washer A 55 Moun
26. g the tool tip and Hammering only for chiseling and chipping Soft touch grip side handle for easier handling Needle pin type slip clutch Internal double insulation construction Constant speed with with sturdy aluminum frame variable speed control Bes ee 4 1 Selling Point Descriptions 4 1 1 High drilling speed with low vibration and noise level The drilling speed is 10 faster than that of similar products thanks to efficient striking energy transmission and speed setting Even so the Model DH 40MR produces lower vibration and noise levels than those of similar products Maker Model HITACHI HITACHI B D C DH 40MR DH 40MA MB Ratio of drilling speed 96 100 64 85 64 74 Full load vibration level dB VL 116 8 118 0 119 8 116 1 118 5 m s 6 9 7 9 9 8 6 4 8 4 Full load noise level dB A 92 4 94 6 93 7 93 2 93 5 No load noise level dB A 79 5 89 4 85 0 83 0 80 3 Ratio of drilling speed A 28 mm dia drill bit is used Full load vibration and noise levels A 20 mm dia drill bit is used 4 1 2 Self drilling Good feeling Thanks to the computer simulated optimum striking characteristics the quantity of body jumping is less than that of the current Model DH 40MA and the working tool smoothly penetrates into the workpiece with a light pressing force The Model DH 40MR realizes quicker self drilling
27. ks are test TANT using drill bits which are Bayer the tool s rated capacity Use the above data as a reference for comparisons only Fig 1 Test conditions Direction Downward drilling Pushing force 98 N 10 kgf Test material Concrete panel with a compression strength of 2 919 N cm 240 kgf cm 6 3 Chiseling Performance Comparison Chiseling performance varies considerably depending on the work conditions Use the factory test results shown in Fig 2 for comparison purposes only ee P an Pe supply HITACHI DH40MR HITACHI DE4OMA MB S l O PS SS ISSO Fig 2 Note B s chiseling amount is greater than the others because the circuit is controlled to make the number of hammering in the Hammering only mode higher than that in the Rotation Hammering mode However B has inconveniences such as unbalanced hammering heavy vibration heavy tool shake and difficulty in positioning the tool because B increases only the number of hammering without changing the weight of the striker that is hammering energy The Model DH 40MR realizes self chiseling in addition to self drilling 4 1 2 Self drilling Good feeling 6 4 Comparison of Drilling Speed Change by Pushing Force The graph shown in Fig 3 illustrates the relationship between handle pushing force and drilling speed DH40MR HD B DH40MA MB Pushing force 100 DH 4
28. listed on the Caution Plate attached to each tool 7 1 Handling Instructions Although every effort is made in each step of design manufacture and inspection to provide protection against safety hazards the dangers inherent in the use of any electric power tool cannot be completely eliminated Accordingly general precautions and suggestions for the use of electric power tools and specific precautions and suggestions for the use of the Rotary Hammer are listed in the Handling Instructions to enhance the safe efficient use of the tool by the customer Salespersons must be thoroughly familiar with the contents of the Handling Instructions to be able to offer appropriate guidance to the customer during sales promotion 7 2 Caution Plate The Model DH 40MR unit is provided with a Caution Plate illustrated below which lists basic safety precautions in use Carefully ensure that the customer fully understands and follows these precautions before using tool For Australia and New Zealand CAUTION eRead thoroughly HANDLING INSTRUCTIONS before use For the U S A and Canada WARNING To reduce the risk of injury user must read and understand instruction manual AVERTISSEMENT 4 i de r duire doit lire et bien comprendre le mode d emplol 12 8 REFERENCE INFORMATION 8 1 Grease Replacement The striking portion and the speed reduction portion of the Model DH 40MR respectively use different types
29. m 140 0 kgf cm Hex socket head bolt M6 x 25 Tappinig screw Db eite tte n t te i e Er enar eed 2 94 0 49 N m 30 5 kgf cm Hex socket head bolt 6 x 45 9 8 139 N m 100 kgf cm Hex socket head bolt M6 x 22 Tail cover mounting bolt Lu l u w wu a ua nr nanna 4 41 0 49 N m 45 5 kgf cm Hex socket head bolt M5 x 10 Crank cover mounting bolt nene nenea ame amana 4 41 0 49 N m 45 5 kgf cm Lever shaft mounting bolt Hex socket head bolt M4 x 12 Tapping screw W Flange DA nea nana nana ana 1 96 0 49 Nem 20 5 kgfecm Handle mounting bolt L 4 41 0 49 Nem 45 5 kgf cm Hex socket head bolt W Flange M5x14 og 9 5 Internal Wiring e Wiring diagram for products without noise suppressor Stator Controller Armature Plug circuit ass y Connector e Wiring diagram for products with noise suppressor Stator Switch Controller circuit ass y include noise suppressor Armature Plug Pillar terminal e Mounting diagram for products with noise suppressor Case B Control circuit ass y include noise suppressor Housing Lead wires of switch and cord ab Lead wire of stator Lead wire of noise suppressor 9 6 Insulation Tests On completion of disassembly and repair measure the insulation resistance and dielectric strength Insulation resistance 7 MQ or more with DC 500 V
30. na aa nana nana aaa 10 6 4 Comparison of Drilling Speed Change by Pushing Force 10 6 5 Drilling Speed and Quantity of Body JUMPING LL nanna nr nana ana 11 7 PRECAUTIONS IN SALES PROMOTION U u anna 11 LA Handling INSTUCIONAS uuu atata tat bt tt o tt i at a aa 11 7 2 Caution dri ER 12 8 REFERENCE INFORMATION u u u luu u c uuu u u uu ca ia u DR aa atasa ala 12 8 1 Grease Replacement 000 AM rn 12 8 2 O Ring Replacement oa dn tt a a ada 12 8 3 Structure of DH 40MR Rotary Hammer nenea nana nana na emana na 13 9 REPAIR GUIDE 18 9 1 Disassembly D i et iat i 18 9 2 Pa a Da at a a ta bt it ibid ta il at 20 9 3 Screw Locking Agent TB1401 eee ame 23 9 4 Tightenirig uuu az a a i a i a Emi a aa 23 9 5 Internal Wirlng ceata a it i br A eta ia i 24 9 6 Insulation 5 5 ea aa a E a a a n E cat i a a at 25 9 7 No load Current Value uuu red ala ve a oi 25 10 STANDARD REPAIR TIME UNIT SCHEDULES 26 Assembly Diagram for DH 40MR 1 PRODUCT NAME Hitachi Rot
31. ng and stripping Asphalt cutting etc Hammering x ass 1 Cutter SDS max shank Overall length Width Code No 400 mm 15 3 4 50 mm 2 313475 9 Digging Substitute pick ax Hammering Ce 1 Scoop SDS max shank Overall length Code No 400 mm 15 3 4 313476 10 Surface roughing work Hammering E i 1 Bushing tool 2 Shank SDS max shank Code No Overall length Code No 313477 220 mm 8 21 32 313479 11 Tamping work Hammering 1 Rammer 2 Shank SDS max shank Code No Overall length Code No 313478 220 mm 8 21 32 313479 150 mm x 150 mm 12 Syringe for chip removal Code No 944575 13 Impact drill grease 500 g 1 1 Ibs Can 70 g 2 5 oz Tube 30 g 1 0z Tube Code No 980927 Code No 308471 Code No 981840 Note Code numbers listed above are subject to change without noitce Please refer to periodic Technical News Bulletins 6 COMPARISONS WITH SIMILAR PRODUCTS 6 1 Specification Comparisons Maker Model Hitachi Hitachi B D C Item DH 40MR 40MA MB EET 40 40 40 32 40 l Drill bit dia mm 1 9 1 6 1 9 1 6 1 1 4 1 9 1 6 Capacity it di 105 105 105
32. on First gear EL Cylinder Striker Clutch Grip Needle holder Handle Front cap AN Ci Retainer sleeve Key rail O ring Needle pin Needle roller Second gear Bevel pinion Armature Control circuit ass y M O Torque transmission Armature revolution is transmitted to the second gear to rotate the bevel gear via the slip mechanism between the second gear and bevel pinion axes Rotation of the bevel gear is then transmitted to the cylinder keyed thereto through the clutch Cylinder rotation is conveyed to the retainer sleeve coupled together by means of four needle pins and then to the drill bit inserted into the retainer sleeve by way of three key rails and two needle rollers which couple them together O Striking operation The rotation of the armature is transferred to the crank shaft and connecting rod which in turn cause the piston to reciprocate inside the cylinder As the piston reciprocates the changing air pressure inside the air chamber between the piston and the striker causes the striker to continuously strike against the end of the second hammer At the same time the air cushion effect within the air chamber absorbs the impact of the striker Should the air escape from the air chamber the air cushion effect would cease and the impact energy would not be absorbed Accordingly the O rings mounted on the striker and piston play an extremely important role in sealing the air within
33. seal as shown in Fig 9 This prevents leakage of grease from the cases while also protecting them against dust from outside The tool holder is also protected from foreign dust by means of a rubber front cap Rubber seal Oil seal mt rss ce ym Py ELE E Front Oil seal La SA 4 Fig 9 21162 O Switching between Rotation Hammering Neutral and Hammering only Lock sleeve Clutch Cylinder Bevel gear Change lever Fig 10 Clutch Lock sleeve Cylinder Bevel gear Change lever Fig 11 Clutch Lock sleeve Change lever Fig 13 All the shanks of the SDS max type working tools such as drill bits for drilling and bull points for chiseling have the same shape When chiseling or chipping with the Model DH 40MR it is necessary to stop the rotation and choose the Hammering only mode by mean of the change lever to lock the working tool against rotation Figure 10 is a cross sectional view showing the Rotation Hammering mode in which the bevel gear claw meshes with the clutch claw to transmit rotation to the cylinder keyed to the clutch so as to rotate the working tool Figure 11 is a cross sectional view showing the Neutral mode in which with the change lever turned 90 the bevel gear is brought out of engagement with the clutch to cut off transmission of rotation In this position the tool holder grip can b
34. t the Feather Key 3 x 3 x 8 44 to the Bevel Pinion 50 then press fit into the Gear Holder 56 Mount the Second Gear 59 around the outer circumference of the Gear Holder 56 Before mounting apply Hitachi Motor Grease No 29 to the inner circumference of the Second Gear 59 Insert the ten Needles 58 being careful not to incline them then push in ten Springs C 57 as shown in Fig 23 Fill the slots and the through holes of the Gear Holder 56 with Hitachi Motor Grease No 29 Press fit the Bevel Pinion 50 into the Spacer 60 and the Ball Bearing 629VVC2PS2L 61 Bevel Pinion 50 Collar 51 Gear Holder 56 Needle 58 Washer A 55 Ball Bearing asner A 155 n 6002DDCMPS2L 53 Spring C 57 Gear Holder 56 E Bevel Pinion 50 at tA Second Gear 59 Rad es Dea aad Spacer 60 oer 3 x 3 x 8 44 Ball Bearing 629VVC2PS2L 61 Cross section A A Fig 23 5 Carbon brush inspection Wear limit The motor employs Carbon Brushes 91 which are consumable parts When they become worn to or near wear limit 7 mm it could result in motor trouble Replace the Carbon Brushes 91 with new No of carbon brush 73 means the last two digits of the code number ones which are numbered 73 as shown in Fig 24 In addition always keep Carbon Brushes 91 clean and ensure that they slide freely within the brush Fig 24 holders g 6 Application of lubricant Apply special grease for
35. vel Pinion with a hand press bearing puller Place the assembly on a sleeve type support facing Washer A 55 downward as shown in Fig 19 Push the Spacer 60 side of the Bevel Pinion 50 with a hand press to remove the Gear Holder 56 and the Spacer 60 from the Bevel Pinion 50 Before removal of the Second Gear 59 from the Gear Holder 56 put the assembly in a poly bag and disassemble it inside the poly bag to prevent missing of Spring C 57 and the Needle 58 Fig 19 9 2 Reassembly Reassembly can be accomplished by following the disassembly procedure in reverse However special attention should be given to the following items 1 Reassembly of the first gear and the crank shaft Press fit Oil Seal B 48 into the Cylinder Crank Case 49 and mount O ring S 40 47 Press fit the Ball Bearing 6203DDCMPS2L 46 Mount the Retaining Ring for D40 Hole 45 using a retaining ring puller Press fit the Crank Shaft 43 into the Ball Bearing 6203DDCMPS2L 46 Put the Feather Key 3 x 3 x 8 44 in the groove of the Crank Shaft 43 and press fit the First Gear 64 with a suitable tool while holding the flat portion of the Crank Shaft 43 with a steel bar Before press fitting make sure that the Feather Key 3x 8 44 fits in the key groove of the First Gear 64 Fig 20 Suitable tool First Gear 64 Cylinder Crank Case 49 Feather Key 3 x 3 x 8 44 Oil Seal B 48 O ring S 40
36. with better impact feeling Impact efficiency About 10 up Maximum compressed air force piston force About 50 down Quantity of body jumping About 25 96 down 4 1 3 Internal double insulation construction with sturdy aluminum frame The aluminum die cast outer frame is very sturdy same as the Models H 45MR H 45SR In addition a plastic internal S holder is adopted to realize double insulation construction Thus the housing has greater rigidity and the double insulated motor has greater durability The Model DH 40MR is heavy duty and the service life of the carbon brush is greatly prolonged 1 5 times longer than the conventional one minimizing disconnection of the armature deviation of the core and grease leakage 4 1 4 Dial type constant speed with variable speed control The Model DH 40MR is equipped with a built in electronic control circuit that can adjust the number of hammering steplessly between 1320 and 2650 min with the dial Even though the load varies the Model DH 40MR provides better operability and stable and efficient drilling performance because the constant speed control minimizes changes in number of rotation and hammering 4 1 5 Soft touch grip for easier handling The double layer molded handle consists of a nylon resin base covered with a soft plastic layer to ensure a soft touch and firm non slip grip of the handles 4 1 6 Change lever for switching between Rotaion Hammering
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