DH 50MB - hitachi
Contents
1. Outer diameter Overall length Outer diameter Overall length mm mm Code No mm mm Code No 6 5 8 340 13 3 8 313448 16 5 8 540 21 1 4 313456 ne 340 13 3 8 313449 19 3 4 540 21 1 4 313457 2 7 8 320 12 5 8 313450 22 7 8 520 20 15 32 313458 en 320 12 5 8 313451 25 1 520 20 15 32 313459 a 1 8 370 14 9 16 313452 28 1 1 8 570 22 7 16 313460 2 1 1 4 370 14 9 16 313453 32 1 1 4 570 22 7 16 313461 8 1 1 2 370 14 9 16 313454 38 1 1 2 570 22 7 16 313462 o 9 16 370 14 9 16 313455 40 1 9 16 570 22 7 16 313463 2 Driling work for anchor holes rotation hammering Drill bit taper shank Sos 1 Drill bit taper shank 2 Taper shank adapter 3 Cotter 1 Drill bit taper shank 2 Taper shank adapter 3 Cotter Outer diameter mm Code No Taper dimension Code No Code No 11 7 16 944460 12 3 15 32 944461 12 7 1 2 993038 Morse taper No 1 13464 944477 14 3 9 16 944462 SIUS 14 5 9 16 944500 17 5 11 16 944463 SDS plus shank bit adapter MN i E iu EL L lf 1 Drill bit SDS plus shank 2 SDS plus shank bit adapter Code No 313465 3 Boring work for large diameter holes rotation hammering JD o 18 1 Guide2. DH 50 POWER TOOLS TECHNICAL DATA HAMMER DRILL AND DH 50MB SERVICE MANUAL aww 3 LIST 455 Feb 2000 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT Notice for use Specifications and parts are subject to change for improvement Refer to Hitachi Power Tool Technical News for further information CONTENTS Business Section Page 1 PRODUCT NAME CORP E UIDEMUS MEIN aho PP QUIM E PE Hs i AUCI A Ns Dade nd a T 1 2 MARKETING OBJECTIVE 1 3 APPLICATIONS EE HEARTS Bd e RER DUM Iba CERT RARE S RPM EE GC RATIS RU os QURE E E CORR US TR GRE EUR RR 1 4 SELLING POINTS EE ERE RES Es 2 4 1 Selling Point Descriptions SS EE EE EE EET 3 5 SPECIFICATIONS eT ETT CE eT TET Tee eee eee LTT Ten E 5 5 1 Specifications WoW aA ROTTS RE EAE CC P VE TC HT ROTTS NT OTRO TC RV E OE d CHR 5 5 2 Optional Accessories debe depu PE qp e EE d MAIRIE Ee IPM 6 6 COMPARISONS WITH SIMILAR PRODUCTS 2 77 10 6 1 Specification Comparisons X TEE ON TEOET 10 6 2 Drilling Speed Comparisons eT ee ee OV EE OEI ee re ee ree eer te DE 11 6 3 Chi
3. CODE NO DESCRIPTION REMARKS DH 50MB 340 463C STATOR ASS Y 110V 115V INCLUD 101 340 463D STATOR ASS Y 120V 127V INCLUD 101 340 463E STATOR ASS Y 220V 230V INCLUD 101 340 463F STATOR ASS Y 240V INCLUD 101 340 463G 958 032 STATOR ASS Y 115V BRUSH TERMINAL INCLID 101 FOR USA CAN 318 607 HOUSING ASS Y INCLUD 109 110 115 116 HITACHI LABEL 318 570 NYLOCK BOLT W FLANGE M6X40 307 811 318 599 TAPPING SCREW W FLANGE D4X16 BLACK BRUSH CAP COVER 940 540 BRUSH CAP 999 077 CARBON BRUSH AUTO STOP TYPE 1 PAIR 980 487 BRUSH HOLDER 938 477 959 141 HEX SOCKET SET SCREW 5 8 CONNECTOR 50092 10 PCS 313 948 DIAL FRAME NAME PLATE 318 632 PRISM 318 593 BRUSH HOLDER PIECE 944 954 BEARING WASHER 620 1VV BALL BEARING 6201VVCMPS2L 318 598 TAIL COVER 303 273 305 558 TAPPING SCREW W FLANGE D5X16 TAPPING SCREW W FLANGE D5X25 BLACK 318 571 SIDE COVER ASS Y INCLUD 114 123 129 318 572 HANDLE PACKING A 991 711 DISTANCE PIECE B 318 601 313 093 HANDLE SWITCH C 2P SCREW TYPE W O LOCK 318 602 HANDLE COVER 301 653 TAPPING SCREW W FLANGE D4X20 BLACK 318 573 HANDLE PACKING B 940 778 958 049 CORD ARMOR D10 7 CORD ARMOR D8 2 992 810 TERMINAL 980 063 TERMINAL FOR SAF
4. Shank Overall length Code No 220 mm 8 21 32 313479 2 Shank Overall length Code No 220 mm 8 21 32 313479 12 Syringe for removal 13 Impact drill grease 0 Code No 944575 c ec 500 g can Code No 980927 70 g tube 30 g tube Code No 308471 Code No 981840 Note Code numbers listed above are subject to change without notice Please refer to periodic Technical News Bulletins for updates 6 COMPARISONS WITH SIMILAR PRODUCTS 6 1 Specification Comparisons Maker Model HITACHI Item DH 50MB S 4 _ Drill bit dia mm 50 2 52 2 37 1 7 16 Capacity Core bit dia mm 160 6 1 4 150 6 160 6 1 4 ae 1400 1500 1050 Rotation No load min 120 250 120 250 0 255 speed Full load min 120 250 120 250 0 255 Full load blow min 1200 2500 1100 2250 0 2700 Weight Catalog weight 9 8 21 6 lbs 10 8 23 8 Ibs 7 9 17 4 Ibs kg Actual weight 10 3 21 6 Ibs 10 8 23 8 Ibs N A Overall length mm 495 19 1 2 595 23 1 2 495 19 1 2 2 Height mm 293 11 9 16 280 11 1 32 5259 10 7 32 amp Width mm 120 4 3 4 128 5 1 16 115 4 17 32 level dB A Insulation structure Double insulation Double insulation Double insulation Full load
5. from the Retainer Sleeve 52 zog 9 2 Reassembly Perform reassembly the reverse order of disassembly while observing the given precautions and taking care of the following points 1 Lubrication Apply special grease for hammer and hammer drill to the following portions 6 Inner circumference of the Connecting Rod Ass y 76 Two O Rings 73 attached to the Striker 72 and Piston 75 e Inner lip portion of the Oil Seals 10 and 92 Fill 30 g of special grease in the Cylinder Case 58 and 75 g of special grease in the Crank Case 35 of the connecting rod side Apply power tool grease No 29 to the Needle Bearing 49 and armature pinion Fill 40 g of power tool grease No 29 in the gear section of the gear cover and the crank case and 20 g between the slip clutch washer A side and the crank case 2 Oil seal and others Handle with care not to damage the Rubber Seal 34 in the Crank Case 35 two O Rings 73 in the Piston 75 and Striker 72 O Ring 53 in the Second Hammer 54 O Ring D 62 in the Cylinder Case 58 O Ring 9 in the Front Cover 8 O Ring 83 in the Lever Shaft 84 Cil Seal 10 in the Front Cover 8 and Seal 92 in the Gear Cover 50 54 3 Slip clutch ass y Press fit the Ball Bearing 6202 18 into the Bevel Pinion 16 and insert the Washer 19 and then Washer A 20 into the Bevel Pinion After mounting the Feather Key 3 x 3 x 8 17 in the Bevel Pinion pre
6. 150 313 466 CORE BIT SHANK B SDS MAX D25 35 313 467 CORE BIT SHANK A SDS MAX D38 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 313 477 BUSHING TOOL SDS MAX 313 478 RAMMER SDS MAX 150MM X 150MM 313 479 SHANK SDS MAX FOR RAMMER BUSHING TOOL 944 575 SYRINGE 318 085 SYRINGE BELLOWS TYPE 308 471 GREASE FOR HAMMER HAMMER DRILL 70G 980 927 GREASE FOR HAMMER HAMMER DRILL 500G INCLUD 673 a 1 sch Lech lech 1 sch 1 ech JI sch Iech 1 sch JL ech LL 1 sch 1 sch sch sch 1 sch sch 1 sch sch 1 00 ALTERNATIVE PARTS 36
7. 54 60 64 70 75 79 94 100 105 120 150 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 3 4 6 ars 1 13 mm 1 2 drill chuck 2 Chuck adapter 13VLA m 8 Chuck wrench 1 18 mm 1 2 drill chuck 13VLA 2 Chuck adapter 3 Chuck wrench Code No 950272 Code No 313468 Code No 930515 5 Chemical anchor hole drilling work rotation hammering em Socket 1 Chemical anchor adapter Socket square size Code No 12 7 mm 1 2 313469 19 0 mm 3 4 313470 6 Demolition work hammering 1 Bull point Overall length Code No 280 mm 11 313471 400 mm 15 3 4 313472 7 Grooving and edging hammering 1 Cold chisel Overall length Code No 280 mm 11 313473 400 mm 15 3 4 313474 8 Cutting and stripping asphalt cutting etc hammering Oan 1 Cutter Width Overall length Code No 50 mm 2 400 mm 15 3 4 313475 9 Digging substitute pick ax nammering 1 Scoop Overall length Code No 400 mm 15 3 4 313476 10 Surface roughing work hammering 1 Bushing tool Code No 313477 11 Tamping work hammering 1 Rammer Code No 313478 150 mm x 150 mm 2
8. Ass y Seal Packing Gear Cover Needle Bearing Armature Ass y Ball Bearing 6203VV Dust Washer Oil Seal Sleeve B Crank Case Crank Shaft Feather Key 5x5x15 Ball Bearing 6205 Bearing Cover First Gear Second Pinion Bevel Pinion Key 3x3x8 Oil Seal A Ball Bearing 6202 Washer A Gear Holder Spring C Needle Pin Second Gear Spacer Ball Bearing 629VV Needle Pin Cylinder O Ring D Clutch Spring Lock Sleeve Lock Spring Cylinder Case Needle Bearing x 2 Bevel Gear Sleeve A 29 Assembly Diagram for DH 50 N V ved 0 Hg T9 SIN AC NM NA A r 30 PARTS CODE NO DESCRIPTION REMARKS DH 50MB 313 415 FRONT CAP 318 608 GRIP 318 590 STOPPER RING 313 413 NEEDLE HOLDER 313 419 318 589 RETAINER SPRING SPRING HOLDER 880 810 NYLOCK HEX SOCKET HD BOLT M8X25 318 587 FRONT COVER 878 863 O RING S 70 318 588 318 586 OIL SEAL NBR710 URETHANE RING 318 585 URETHANE RING HOLDER 318 582 RETAINING RING D40 600 8CM BALL BEARING 6008CM 318 581 318 551 SLEEVE BEVEL PINION 944 109 FEATHER KEY 3X3X8 620 2DD BALL BEARING 6202DDCMPS2L 313 058 WAS
9. DAMPER 318 567 DAMPER HOLDER 318 568 CYLINDER CASE 318 451 NYLOCK BOLT W FLANGE M6X35 318 560 NEEDLE BEARING 981 973 CYLINDER WASHER 985 779 O RING D 318 659 NEEDLE BEARING 318 559 BEVEL GEAR 313 057 NEEDLE PIN D6X6 971 750 FEATHER KEY 3X3X20 318 558 CYLINDER 318 583 SLEEVE A 318 563 LOCK SPRING 318 562 LOCK SLEEVE 318 631 CLUTCH SPRING 318 630 STRIKER 318 917 O RING FPM 710 318 561 CLUTCH 985 772 PISTON 318 557 CONNECTING ROD ASS Y INCLUD 77 980 756 NEEDLE BEARING NSK AJ50 1203 955 593 PISTON PIN 318 574 SIDE HANDLE 318 575 HANDLE HOLDER 318 576 HANDLE BOLT 971 786 STOPPER ROD 873 095 O RING P 16 318 577 LEVER SHAFT 318 578 UNDER COVER 313 411 SHAFT COVER 318 579 HEX SOCKET HD BOLT W WASHER M4X12 313 410 LEVER 307 605 SPRING 313 424 SLEEVE 313 077 NYLOCK BOLT W FLANGE M5X25 318 596 OIL SEAL FPM 707 620 3VV BALL BEARING 6203VVCMPS2L 318 597 SLEEVE B 318 594 DUST WASHER 318 918 FAN 360 520U ARMATURE ASS Y 110V 115V INCLUD 93 96 117 118 360 520D ARMATURE ASS Y 120V 127V INCLUD 96 360 520E ARMATURE ASS Y 220V 230V INCLUD 96 360 520F ARMATURE ASS Y 240V INCLUD 96 318 633 FAN GUIDE 953 121 HEX HD TAPPING SCREW D5X50 1 00 ALTERNATIVE PARTS PARTS
10. ass y Switch Handle Cover Plug holder Cord Side cover Housing Handle cover s ff Plug B Plug A ass y Fig 14 20 e Handle and side handle The handle section is of a two layer structure consisting of a molded plastic base reinforced with glassfiber and a soft plastic layer molded together on the base The side handle is also constructed of two layers consisting of a reinforced plastic base molded together with steel nut and soft plastic surrounding the base This newly designed handle and side handle structure ensure a lower vibration and a better more comfortable grip for a improved operability Front ca Front cover Cylinder case Crank case Rubber seal Grip O ring O ring Crank case cover i rug Gear cover Oil seal Housing TITKI Quel DU L Fig 15 e Sealing and dust proof structure The crank case and cylinder case section are tightly sealed with four O rings two oil seals and rubber seals as shown in Fig 15 This prevents leakage of grease from the cases while also protecting them against dust from the outside The tool holder is also protected from foreign dust by means of a rubber front cap 21 e Indication lamp for carbon brush replacement The indication lamp for carbon brush replacement is described below with reference to Fig 16 As the carbon brush wears the gu
11. head bolts except for M8 for front cover mounting and M6 hexagon socket head bolts for cylinder case mounting which are special bolts to be treated as service parts 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 9 4 1 Tightening torque of each screw e M5 Hex Socket Hd Bolt 7 845 Nem 80 kgf cm 69 40 in Ibs e D4 Tapping Screw 2 0 0 5 Nem 20 5 kgf cm 17 4 4 3 in Ibs e 05 Tapping Screw 2 9 0 49 Nem 30 5 kgf cm 26 0 4 3 in Ibs Bolt for mounting the side cover M5 x 16 Flanged Bolt 3 92 0 49 N m 40 5 kgf cm 34 7 4 3 in Ibs e Bolt for mounting the crank case cover 5 x 16 Flanged Bolt 4 9 0 98 N m 50 10 kgf cm 43 4 8 7 in Ibs e Bolt for mounting the housing M6 x 40 Flanged Bolt 4 9 0 Nem 50 kgf cm 43 4 0 in Ibs e Bolt for mounting the front cover M8 x 25 Hex Socket Hd Bolt 22 1 4 9 Nem 225 50 kgf cm 195 2 43 4 in Ibs e Bolt for mounting the cylinder case M6 x 35 Flanged Bolt 9 8 04 N m 100 kgf cm 86 8 0 in lbs 9 5 Wiring Diagrams e For products without noise suppressor Stator Switch Control circuit ass y Armature Connector Stator Switch Red Noise suppressor Control circuit ass y Armature Pillar terminal Fig 22 9
12. i 2 Removing gears from the crank case Remove the Retaining Ring for D17 Shaft 47 and the Thrust Bevel pinion 16 Washer 46 from the Crank Shaft 40 Pull out the First Gear 45 with a bearing puller Remove the Feather Key 5 x 5x 15 29 Remove the Slip Clutch Ass y 27 by hammering the Crank Case 35 from the Gear Cover 50 side with a plastic hammer Remove the two Nylock Hex Socket Hd Bolts M5 x 16 38 from the Bearing Cover 43 and pull out the Crank Shaft from the Gear Cover side The Slip Clutch Ass y can be removed with the following Washer A 20 procedure First pull out the Ball Bearing 629VV 26 with a bearing puller Support Washer A 20 on a sleeve as Fig 17 shown in Fig 17 and release the press fitted Bevel Pinion 16 by pushing it from the Spacer 25 side using a hand press When removing the Gear Holder 21 from the Second Gear 24 it is recommended to keep them inside a vinyl bag during disassembly to prevent Front Cap 1 Springs C 22 and Needle Pins D6 x 6 23 from E 5 scattering 3 Disassembly of the tool holder Slide the Grip 2 fully in direction indicated by the arrow as shown in Fig 18 and remove the Front Cap 1 since the Front Cap is made of rubber grasp its outer face and strongly pull it to remove This allows the Grip Stopper Ring 3 Needle Holder 4 Retainer Spring 5 Needle Rollers Fig 18 2 pcs 51 and Spring Holder 6 to be separated
13. precautions before using the tool 1 For Australia New Zealand and China CAUTION 6 Read thoroughly HANDLING INSTRUCTIONS before use 2 For the U S A and Canada N WARNING To reduce the risk of injury user must read and understand instruction manual AVERTISSEMENT Afin de reduire le risque de blessures l utilisateur doit lire et bien comprendre le mode d emploi Ld 8 For Taiwan T JH RI 58 EE ERU SE HH sn 8 REFERENCES 8 1 Grease Replacement Procedures The electro pneumatic hammering section and gear change section each use different kinds of grease It is not necessary to replenish the grease unless the tool is disassembled for repair or there is a grease leakage due to a damaged seal A special grease is used for the hammering section To change the grease in the hammering section Cylinder Case and Crank Case carefully wipe the old grease off the parts and re lube with 30 g in the Cylinder Case and 75 g the Crank Case on the Connecting Rod side Take care not to overfill with grease as an excessive amount of grease can cause hammering failure The gear change section in the Gear Cover uses grease No 29 for power tools Lube with 40 g of this grease Do not use the special grease used for the hammering section or it will leak to the motor parts resulting in failure of the tool 8 2 O Ring Replacement The O ring attached to the Striker and Piston pla
14. 6 Insulation Test On completion of disassembly and repair measure the insulation resistance and dielectric strength Insulation resistance 7 or more with DC 500 V Megohm Tester Dielectric strength AC 4 000 V 1 minute with no abnormalities 220 V 240 V and 110 V for U K products AC 2 500 V 1 minute with no abnormalities 110 V 127 V except U K products 9 7 No Load Current Values After no load operation for 30 minutes the no load current values should be as follows Voltage 110 V 115 V 127V 220 V 230 V 240 V Current A Max 6 8A 6 5A 5 9A 3 4 amp 3 3 3 2 amp 28 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 Cord Armor Tail Cover Ball Bearing 6201VV Crank Case Cover Rubber Seal Front Cap Grip Needle Holder Retainer Spring Spring Holder O Ring Lever Shaft Under Cover Shaft Cover Lever Spring Sleeve Front Cover O Ring x 2 Oil Seal Urethane Ring Ball Bearing 6008CM Damper Damper Holder Urethane Ring Holder Sleeve Needle Roller Retainer Sleeve Second Hammer Handle Plug A Plug B Control Circuit Side Cover Ass y Clutch Connecting Rod Ass y Needle Bearing Piston Piston Pin Striker O Ring Housing Ass y Stator
15. 60 mm 6 1 4 Power Source AC single phase 50 Hz or 60 Hz Voltage current and power input Voltage V 110 115 127 220 230 240 Current A 13 4 12 8 11 6 6 6 6 4 62 Power input W 1400 Rotation No load 120 250 min speed Full load 120 250 min Full load blow 1200 2500 min Type of motor AC single phase commutator motor Type of switch Trigger switch Type of handle D type handle and side handle Insulation structure Double insulation Material Housing Glassfiber reinforced polyamide resin green Enclosure Handle Handle cover p veve Glassfiber reinforced polyamide resin black and gray Crank case cover 495 mm x 293 mm x 120 mm length x height x width Dimensions 19 1 2 x 11 9 16 x 4 3 4 Plastic case color Off black green Net 9 8 kg 21 6 Ibs Weight Gross 15 2 kg 33 5 Ibs Packaging Corrugated cardboard box Standard accessories Plastic ME 1 Side handle EE 1 wrench 4 mm 1 Hex bar wrench 5 1 bar wrench 6 mm 1 Stopper RUE E RE EIU CRT EO I EM E 1 Grease A mE 1 Net weight does not include cord and side handle 5 2 Optional Accessories 1 Drilling work for through holes rotation hammering 1 Drill bit SDS max shank
16. AUS 930 804 TERMINAL M4 0 10 PCS FOR USA CAN 960 266 981 987Z CORD CLIP CORD CLIP FOR SUI 984 750 TAPPING SCREW W FLANGE D4X16 500 3902 CORD CORD ARMOR D10 7 500 4462 CORD ARMOR 010 7 FOR GBR 230V 500 434Z 500 4082 CORD CORD CORD ARMOR D10 7 FOR USA CAN CORD ARMOR D68 2 FOR AUS 500 391Z CORD CORD ARMOR D10 7 FOR SUI 500 4602 CORD CORD ARMOR D10 7 FOR GBR 110V 318 605 CONTROLLER CIRCUIT 318 591 318 606 CONTROLLER CIRCUIT CONTROLLER CIRCUIT ALTERNATIVE PARTS 33 1 N ech N Iech 1 ech 1 sch 22 Q N seh N N OD sch N sch sch 1 ech 1 sch FOR GBR 110V FOR USA CAN 1 00 5 DH 50MB CODE NO DESCRIPTION REMARKS 313 092 PLUG A FOR USA CAN 313 142 PLUG A 959 141 CONNECTOR 50092 10 PCS FOR AUS 318 648 PLUG B 318 600 PLUG B FOR AUS 318 649 PLUG B FOR USA CAN 938 307 PILLAR TERMINAL EXCEPT AUS 318 603 PLUG HOLDER 1 00 ALTERNATIVE PARTS 34 STANDARD ACCESSORIES DH 50MB CODE NO DESCRIPTION REMARKS 318 646 CASE PLASTIC 981 840 GREASE A FOR HAMMER HAMMER DRILL 30G 944 458 HEX BAR WR
17. D 654 959 706 CORE BIT 50MM INCLUD 655 955 155 CORE BIT 54MM INCLUD 656 959 707 CORE BIT 60MM INCLUD 657 956 002 CORE BIT 64MM INCLUD 658 959 708 CORE BIT 70MM INCLUD 659 ALTERNATIVE PARTS 1 00 OPTIONAL ACCESSORIES DH 50MB CODE NO DESCRIPTION REMARKS 959 709 CORE BIT 75MM INCLUD 660 955 157 CORE BIT 79MM INCLUD 661 956 004 CORE BIT 94MM INCLUD 662 959 710 CORE BIT 100MM INCLUD 663 955 159 CORE BIT 105MM INCLUD 664 956 006 CORE BIT 120MM INCLUD 665 956 728 CORE BIT 150MM INCLUD 666 318 531 GUIDE PLATE FOR CORE BIT 25MM 318 532 GUIDE PLATE FOR CORE BIT 29MM 955 997 GUIDE PLATE FOR CORE BIT 32MM 955 999 GUIDE PLATE FOR CORE BIT 35MM 956 001 GUIDE PLATE FOR CORE BIT 38MM 955 166 GUIDE PLATE FOR CORE BIT 45MM 950 475 GUIDE PLATE FOR CORE BIT 50MM 955 167 GUIDE PLATE FOR CORE BIT 54MM 950 476 GUIDE PLATE FOR CORE BIT 60MM 956 003 GUIDE PLATE FOR CORE BIT 64MM 950 477 GUIDE PLATE FOR CORE BIT 70MM 950 478 GUIDE PLATE FOR CORE BIT 75MM 955 168 GUIDE PLATE FOR CORE BIT 79MM 956 005 GUIDE PLATE FOR CORE BIT 94MM 950 479 GUIDE PLATE FOR CORE BIT 100MM 955 169 GUIDE PLATE FOR CORE BIT 105MM 956 007 GUIDE PLATE FOR CORE BIT 120MM 956 743 GUIDE PLATE FOR CORE BIT 150MM 318 530 CENTER PIN FOR CORE BIT D25 29 956 009 CENTER PIN B 147L FOR CORE BIT D32 35 955 165 CENTER PIN A 133L FOR CORE BIT D38
18. ENCH 4MM 944 459 BAR WRENCH 5MM 872 422 HEX BAR WRENCH 6MM OPTIONAL ACCESSORIES CODE NO DESCRIPTION REMARKS 317 483 DRILL BIT SDS MAX D10 5X305 317 484 DRILL BIT SDS MAX D12 5X305 317 485 DRILL BIT SDS MAX D12 7X305 317 486 DRILL BIT SDS MAX D14 3X305 317 487 DRILL BIT SDS MAX D14 5X305 313 448 DRILL BIT SDS MAX D16X340 313 449 DRILL BIT SDS MAX D19X340 313 450 DRILL BIT SDS MAX D22X320 313 451 DRILL BIT SDS MAX D25X320 313 452 DRILL BIT SDS MAX D28X370 313 453 DRILL BIT SDS MAX D32X370 313 454 DRILL BIT SDS MAX D38X370 313 455 DRILL BIT SDS MAX D40X370 313 456 DRILL BIT SDS MAX D16X540 313 457 DRILL BIT SDS MAX D19X540 313 458 DRILL BIT SDS MAX D22X520 313 459 DRILL BIT SDS MAX D25X520 313 460 DRILL BIT SDS MAX D28X570 313 461 DRILL BIT SDS MAX D32X570 313 462 DRILL BIT SDS MAX D38X570 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 INCLUD 629 944 477 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 INCLUD 651 955 998 CORE BIT 35MM INCLUD 652 956 000 CORE BIT 38MM INCLUD 653 955 154 CORE BIT 45MM INCLU
19. HER 318 552 318 554 WASHER A GEAR HOLDER 318 555 SPRING C 313 057 NEEDLE PIN D6X6 318 553 SECOND GEAR 318 556 629 VVM SPACER BALL BEARING 629VVC2PS2L 318 550 SLIP CLUTCH ASS Y INCLUD 16 26 SDS MAX LABEL 945 072 FEATHER KEY 5X5X15 944 525 313 082 BEARING WASHER C NYLOCK BOLT W FLANGE M5X16 991 711 DISTANCE PIECE B 318 584 CRANK CASE COVER ASS Y INCLUD 32 313 084 RUBBER SEAL 318 543 980 750 CRANK CASE GUIDE PLATE 980 727 HANDLE RUBBER 878 181 NYLOCK HEX SOCKET HD BOLT M5X16 939 542 RETAINING RING FOR D12 SHAFT 10 PCS 318 544 620 5DD CRANK SHAFT BALL BEARING 6205DDCMPS2L 965 469 RETAINING RING FOR D25 SHAFT 318 548 BEARING COVER 318 545 SECOND PINION 318 546 318 547 FIRST GEAR THRUST WASHER 967 261 RETAINING RING FOR D17 SHAFT 318 549 SEAL PACKING 939 299 NEEDLE BEARING M661 318 595 313 421 GEAR COVER NEEDLE ROLLER D8X20 31 Iech lech lech 1 ech IM lech lech IM ech lech lech 1 ech 1 sch Lech 1 sch 1 ech 1 sch sch ech ef ech sch N 1 00 PARTS DH 50MB CODE NO DESCRIPTION REMARKS 318 580 RETAINER SLEEVE 986 104 O RING 318 564 SECOND HAMMER 318 565 DAMPER WASHER 318 566
20. MB OOOO 420 19 B 320 i D D 2903 HITACHI DH 50MB 370 22 B B 1275 I D D Ki s 250 1 HITACHI DH 50MB 290 025 225 D mw 1 1 T HITACHI DH 50MB SN 240 28 190 D D kw HITACHI DH 50MB 160 0 32 B B 130 D D ee 120 HITACHI DH 50MB KWH 110 x 038 110 D D e HITACHI DH 50MB SS 90 a 40 B B 90 D D zITEEE 60 Note that the data marked with asterisks test results using drill bits which beyond the tool s rated capacity Use the above data as a reference for comparison purposes only Test conditions Orientation Downward drilling Pressing force 10 kgf Test material Concrete panel with a compression strength of 240 kgf cm Drill bit size SDS max shank drill bit SL EE 6 3 Chiseling Performance Chiseling performance varies considerably depending on the work conditions Use these factory test results shown in Fig 5 for comparison purposes only Test conditions Orientation Downward chiseling Voltage Demolished amount kg 30 min Maker Model 0 50 100 150 200 250 1 1 1 DH 50MB SS 150 230 V B B 145 D D 90 Fig 5 Test material C
21. PAIR TIME UNIT SCHEDULES REESEN 29 Appendix Assembly Diagram for DH 50MB EID REDE RDUM MM PAM 30 1 PRODUCT NAME Hitachi Hammer Drill Model DH 50MB 2 MARKETING OBJECTIVE The market demand for 50 mm 2 class hammer drills is quickly changing from spline or hexagon bit shank types to a SDS MAX bit shank type especially in the European market The new Model DH 50MB which features the SDS MAX bit shank has been developed to meet that market demand The main features of the Model DH 50MB are as follows 1 2 3 4 5 6 7 8 High drilling speed and impact energy Shock absorbing handle 2 mode function Hammer drilling and hammering only and lightweight design Soft grip handle and side handle Vario Lock mechanism 12 positions Constant speed with variable speed control Se vo Dae Fe ae DY wH Warning display indicating service life of carbon brushes 3 APPLICATIONS e Concrete drilling 6 Drilling anchor bolt holes e Crushing chiseling grooving edging cutting stripping compacting tamping and roughing concrete surfaces Application examples e Air conditioning 7 Installation of air conditioners and water coolers e Piping and wiring Electric gas and water supply work e Electric fixtures oe Installation of electric and lighting fixtures e Sanitary facilities Sanitary plumbing e Interior finishing en Installation of s
22. ammering only mode by means of the change lever to lock the working tool against rotation The change lever mechanism is described below with reference to Figs 7 8 and 9 Fig 7 is a cross sectional view showing the Rotation Hammering mode in which the bevel gear dog meshes with the clutch dog to transmit rotation to the cylinder keyed to the clutch so as to rotate the working tool Fig 8 is a 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 power transmission In this position the tool holder grip can be manually turned to enable easier positioning of the working tool for chiseling and chipping Fig 9 is likewise a sectional view showing the Hammering only mode With the change lever turned another 90 the clutch comes into mesh with the lock sleeve and the splines on the outer circumference of the lock sleeve come into mesh with the splines on the internal face of the cylinder case so that the cylinder as well as the working tool are prevented from rotating Since this hammer drill has three switchable modes as mentioned above serious accidents may result if a tool for chipping or chiseling should be used in the Rotation Hammering mode Ensure that your customers are advised to always use the Hammering mode when doing chiseling or chipping work 16 Mechanism to prevent idle hammering The arran
23. eats display counters ducts and interior decoration e Other building construction and repair work 4 SELLING POINTS Compact and lightweight Overall length 495 mm 19 1 2 Weight 9 8 kg 21 6 Ibs B Overall length 595 mm 23 1 2 Weight 10 8 kg 23 8 Ibs C Overall length 610 mm 24 1 32 Weight 10 0 kg 22 0 Ibs Vibration isolating handle reduces operator fatigue Faster drilling speed About 1 8 times faster than the Model DH 40MA Soft touch grip handle and side handle Vario lock mechanism Tool angle can be adjusted easily by using the grip Change lever for switching between Rotation Hammering for drilling Neutral for positioning the tool tip and Hammering only for chiseling and chipping Indication lamp for carbon brush replacement Double insulation construction Variable speed with constant speed Needle pin type slip clutch Sealed grease construction requires minimal maintenance Unique body design Fig 1 4 1 Selling Point Descriptions 4 1 1 Dial type constant speed electronic control with stepless variable speed The Model DH 50MB contains and electronic control circuit which allows the number of revolutions and the number of strikes to be stepless adjustable from levels 1 to 5 on
24. gement against idle hammering of this hammer drill is about the same as for the DH 40MA MB in which when the drill bit or bull point is no longer pressed against the concrete or similar material the second hammer moves to a position shown in Fig 10 so that the striker is displaced from its hammering position This opens the air vent so that the piston movement causes no change in air pressure in the pressure chamber thus stopping the hammering action Striker Pressure chamber Second hammer 01 a d 1 M A loke id Air vent Travel distance of the second hammer Fig 10 e Slip mechanism The slip mechanism is described below with reference to Fig 11 The bevel pinion and the gear holder are coupled together by the key and press fitting The springs C and the needle pins are housed in elongated grooves of the gear holder The needle pin is pressed against the inner face of the second gear by the springs 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 the springs C to allow idle rotation of the second gear With this 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
25. hat the piston moves reciprocally within the cylinder Air pressure developing between the piston and the striker changes with movement of the piston The internal pressure thus pushes the striker to repeatedly strike the end face of the second hammer Since the striker is moved by means of air pressure the cushioning effect of the air absorbs the hammering shock experienced by the operator If air leaks from the air pressure chamber the cushioning effect will not be enough to absorb shock O rings fitted around the striker and piston for air sealing therefore play an important role for the intended function of this hammer drill _ 15 Lock sleeve Clutch Bevel gear E seer i ee m SS TT s A PE ETE T 7 82 ET Falla Md d E SE T al EET Hi CA A Fig 7 Lock sleeve Clutch Bevel gear y N E ix fuis DES ELLE ers Change lever Fig 8 Locksleeve Clutch Bevel gear eer L e Switching between Drill Hammering Neutral and Hammering only The shanks of the SDS max type working tools are all of the same shape for drill bits bull points for chiseling and chipping and cold chisels When chiseling and chipping with this hammer drill it is necessary to stop the drilling motion and choose the H
26. he drill bit is pushed fully until it stops rotating it by hand the latter spring back to bring the drill bit to a locked position When removing the drill bit pull the grip fully backward and pull the drill bit out Front cap Needle holder Forward Backward direction direction Needle roller 2 pieces Key rail pieces Retainer sleeve Fig 13 Z9 Wiring connections The wiring connections are described below with reference to Fig 14 The Model DH 50MB uses a plug in module type wiring system consisting of plug A ass y and plug B ass y The internal wires 2 and 3 of the control circuit ass y and the internal wires from the stator and the internal wire 5 of the control circuit ass y and the internal wire from the piece ass y are press connected by crimp on connectors The rest of the internal wires 1 and 4 of the control circuit ass y are connected to the plug A ass y then the plug A ass y is fitted into the housing The plug B ass y is fitted into the handle section through the plug holder and is connected with the switch terminal and cord Wiring connection is complete when the housing section the handle and handle cover section are all assembled and then fastened together with screws With such a wiring structure assembling and disassembling procedures associated with wiring connection have been largely simplified over previous models Side cover Handle Housing Internal wire of piece
27. ide piece mounted to the carbon brush moves toward the commutator When the guide piece contacts the piece ass y the indication lamp will light up in red as the switch is turned on The indication lamp will begin to light up approximately 10 hours before the service life of the carbon brushes ends When the indication lamp lights up replace both carbon brushes with new ones as soon as possible Indication lamp red for carbon brush replacement Handle Carbon brush Control circuit ass y Housing Side cover Fig 16 22 _ 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY The Bold numbers in the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram 9 1 Disassembly 1 Piston and striker Remove the four Nylock Bolts W Flange M5 x 16 31 at the Crank Case Cover Ass y 33 and remove the latter Remove the four Nylock Bolts W Flange M6 x 35 59 at the Cylinder Case 58 and pull the Cylinder Case out of the Crank Case 35 Pull out the Piston Pin 78 and remove the Piston 75 Remove the Connecting Rod Ass y 76 from the Crank Shaft 40 by removing the Retaining Ring for D12 Shaft 39 Pull out the Striker 72 by hammering on the Cylinder Case with a plastic hammer If it is difficult to pull out the Striker push the removed Piston together with the Connecting Rod Ass y into the Cylinder 67 and quickly pull them out and the Striker will jump out together with the Piston
28. oncrete panel with a compression strength of 2 919 N cm 240 kgf cm SDS max shank bull point of 280 mm Bull point 12 7 PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model DH 50MB Hammer Drill by all of our customers it is very important that at the time of sales 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 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 Hammer Drill 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 Each Model DH 50MB unit is provided with a Caution Plate illustrated below which lists basic safety precautions for its use Carefully ensure that the customer fully understands and follows these
29. plate 2 Center pin 3 Core bit 4 Core bit shank 1 Guide plate Core bits with outer diameter of 32 35 38 45 50 54 60 64 70 75 79 94 100 105 120 150 mm 1 1 4 1 3 8 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 3 4 6 Guide plate is not used with core bits with outer diameter of 25 mm 1 and 29 mm 1 1 8 2 Center pin Code No 956009 for core bits with outer diameter of 32 35 mm 1 1 4 1 3 8 Code No 955165 for core bits with outer diameter of 38 45 50 54 60 64 70 75 79 94 100 105 120 150 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 3 4 6 Center pin is not used with core bits of 25 mm 1 and 29 mm 1 8 3 Core bit Outer diameter mm Code No Outer diameter mm Code No 5 1 955994 75 2 15 16 959709 9 1 1 8 955995 79 3 1 8 955157 2 1 1 4 955996 94 3 11 16 956004 n 3 8 955998 100 3 15 16 959710 8 1 1 2 956000 105 4 1 8 955159 45 1 3 4 955154 120 4 3 4 956006 0 2 959706 150 6 956728 4 2 1 8 955155 E 3 8 959707 4 2 1 2 956002 70 2 3 4 959708 4 Core bit shank Code No 313466 for core bits with outer diameter of 25 29 32 and 35 mm 1 1 1 8 1 1 4 and 1 3 8 Code No 313467 for core bits with outer diameter of 38 45 50
30. seling Performance 22 77 12 7 PRECAUTIONS IN SALES PROMOTION FAE E HEN REI CIR E T EAE SOR M EET ICH V EY dC 13 TA Handling Instructions uk Gps PE EE emma pus an EE E T uma pub T E w aquqa INI QE NON T ES E 13 Ta Caution Plate 13 8 REFERENCES E EE Ee E 14 8 1 Grease Replacement Procedures pep Sod MEE OS OUR dq DX dU EE M heo PROS RES 14 8 2 O Ring Replacement eee ee T DESEE ERES EDU ee Tree Tere Tee RERO 14 8 3 Structure of the DH 50MB Hammer Drill HH MH 15 Service Section 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY eee ee ee UP SO EIU pO PETERE C 23 9 1 I Disassembly eee ee ee ere eT ere eT Tee e E ere eT ere 23 9 2 Reassembly E AAA eA EE BOR B ADMI BARI d MEE 24 9 3 Screw Locking Agent TB1 401 erre 27 9 4 Tightening Torque LIAS OUR REDE EROR E QUEE ROSTERS REREAD ERR E ES E 27 9 5 Wiring Diagrams QUEEN SURPRISES SQUE PEDIS ISI A EUR PADRES NUUS RUE 28 9 6 Insulation Test PEREOS PIERDERE ENEI HARE Eh PEU MARE NUR Rh PER DP NER DRM DE 28 9 7 No Load Current Values ERR ER ee ee ee Te RR RUP CPC RE Ue d ep 28 10 STANDARD RE
31. side handle Section A A Bevel pinion Bevel pinion Gear holder Second gear Elongated grooves NS of the gear holder J C Fig 11 come e Drill bit As illustrated in Fig 12 the tool holder is designed to accept SDS max shank bits so that torque transmission to the drill bit is accomplished with three key rails formed on the tool holder with two needle rollers provided to prevent the drill bit from slipping out The round shank with an outer diameter of 18 mm tends to attract less dust to itself or to the hammer drill itself Also the runout of drill bit becomes less by making the guide length of the shank longer Dia 18 mm Needle roller 2 pieces Retainer sleeve Key slot KSC Key slot Cross section A A Key rail 3 pieces Needle holder Tool holder cross section Fig 12 18 Tool holder The tool holder is described below with reference to Fig 13 The drill bit inlet is covered with a front cap rubber to prevent entry of cutting chips Two needle rollers fit into the round groove of the drill bit to prevent it from slipping out of the tool holder while the three key rails provide positive torque transmission to the drill bit The drill bit can be easily removed simply be pulling back the grip The grip is spring loaded in the forward direction so that pulling the grip fully backward allows the needle rollers to move away from the bit When on the other hand t
32. ss fit the Gear Holder 21 into the Bevel Pinion Next apply special grease for hammer and hammer drill to the inner circumference of the Second Gear 24 Install the Second Gear 24 on the outer circumference of the Gear Holder and place the Needle Pins 23 without inclination as indicated in Fig 19 then press the Springs C 22 Press in the Spacer 25 and then Ball Bearing 629 26 Gear Holder 21 Bevel Pinion 16 Gear Holder 21 Fig 19 4 Inspecting the carbon brushes The motor employs auto stop carbon brushes When the carbon brushes near their wear limit the motor stops automatically At that time replace both carbon brushes with new ones which have the same carbon brush number 77 as shown in Fig 20 In addition always keep carbon brushes clean and ensure that they slide freely within the brush holders Number of carbon brush 77 denotes the last two digits of the code number Fig 20 25 Caution The factory installed carbon brushes are not identical to each other as shown in Fig 21 Pay attention to their difference when reassembling after inspection There is no problem when replacing them with a pair of carbon brushes supplied as service parts No 77 because both parts are the same type guide piece provided Handle Housing Carbon brush Carbon brush 96 9 3 Screw Locking Agent 1 81401 Apply screw locking agent ThreeBond TB1401 to all of the M5 hexagon socket
33. the dial The number of revolutions and the number of strikes are within the range of values in the graph shown below due to variations of products The constant speed control minimizes the change in the number of revolutions or number of strikes at the position set on the dial even if the load fluctuates thus providing ease of use and stable drilling efficiency Speed adjust dial Fig 2 3000 Blow 2500 A 2000 350 _ Rotation Speed 4 300 Cz 1500 250 8 m o 200 5 100 1 2 3 4 5 Speed adjust dial Fig 3 4 1 2 Faster drilling speed The drilling speed is 1 8 times faster than that of the Model DH 40MA as the Model DH 50MB has greater striking energy owing to the optimized design of the rotation speed striking frequency and the weight of striker 4 1 3 Vibration isolating handle offers less operator fatigue The two vibration isolating rubbers provided between the handle and the crank case and also between the handle and the housing efficiently absorb the vibration transmitted from the tool main body to minimize transmission of vibration to the operator s arms MP Vibration isolating rubber Handle side Vibration isolating rubber 4 1 4 Indication lamp for carbon brush replacement The indication lamp will light up red approximately 10 hours before the service life of the carbon brushes ends to notify the opera
34. tor that the carbon brushes should be replaced with new ones Replacement of carbon brushes at the proper time can prevent sudden stop of the motor and result in more efficient operation Indication lamp for carbon brush replacement red 4 1 5 Easy to use tool holder The easy to grip tool holder allows the tool to be attached and removed simply by sliding the grip backward 4 1 6 Soft touch grip handle and side handle The double layer molded handle and side handle consist of a plastic resin base covered with a soft plastic layer to ensure a soft touch and easy grip of the handles 4 1 7 Change lever for switching between rotation 4 hammering neutral and hammering only The Model DH 50MB 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 using the change lever located under the cylinder case This permits accurate centering and positioning because the function mode can be switched to the hammering only function mode with the drill bit for concrete drilling mounted 4 1 8 Needle pin type slip clutch The Model DH 50MB is equipped with a needle pin type slip clutch to ensure a greater accuracy of slip torque and enhanced safety 5 SPECIFICATIONS 5 1 Specifications Capacity Drill bit max diameter 50 mm 2 Core bit max diameter 1
35. vibration level dB 120 120 119 No load sound pressure 87 85 84 Weight does not include cord and side handle aja 6 2 Drilling Speed Drilling speed varies considerably depending the work conditions Use the factory test results shown Fig 4 as a reference for comparison purposes only Fig 4 Drill bit dia Maker Model Drilling speed mm min Si mm 0 100 200 300 400 500 HITACHI 50MB 480 16 380 i D D 340 HITACHI DH 50
36. ys an important role to ensure air tightness Despite its prolonged service life due to its special rubber material it will inevitably wear out Early replacement preferably once every six months is recommended 14 8 3 Structure of the DH 50MB Hammer Drill Second Connecting Grip hammer Striker Key Piston rod First gear Needle Air Baval Front cap holder Cylinder Clutch chamber gear Crank shaft Handle Retainer Key slot sleeve T au Needle roller pn O ring Second gear Bevel pinion Armature fi Her E e Torque transmission Rotation transmission is described below with reference to Fig 6 The gear arrangement of the Model DH 50MB has the armature shaft positioned between the crank shaft and bevel pinion shaft Rotation of the armature shaft is transmitted to the second gear through the first gear of the crank shaft and the second pinion Then the rotation is transmitted from the second gear through the slip mechanism disposed between the second gear and the bevel pinion shaft to turn the bevel gear The bevel gear is keyed to the cylinder through the clutch to rotate together Rotation of the cylinder is transmitted 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 slots and two needle rollers which couple them together Hammering Armature rotation is transmitted to the crank and connecting rod so t
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