Hitachi DH 50MB Technical Data And Service Manual Download Page 22

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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.

Fig. 14

Handle

Side cover

Housing

Plug (A) ass'y

Plug (B) ass'y

Handle cover

Internal wire of stator

Cord crip

Handle
cover

Switch

Handle

Side cover

Plug (A) ass'y

Connector

Internal wire of
piece ass'y

Housing

Control circuit ass'y

Dial
frame

Plug (B)
ass'y

Plug holder

Cord

Summary of Contents for DH 50MB

Page 1: ...POWER TOOLS TECHNICAL DATA AND SERVICE MANUAL HAMMER DRILL DH 50MB SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E455 Feb 2000 D MODEL DH 50MB ...

Page 2: ... 7 2 Caution Plate 13 8 REFERENCES 14 8 1 Grease Replacement Procedures 14 8 2 O Ring Replacement 14 8 3 Structure of the DH 50MB Hammer Drill 15 Service Section 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 23 9 1 Disassembly 23 9 2 Reassembly 24 9 3 Screw Locking Agent TB1401 27 9 4 Tightening Torque 27 9 5 Wiring Diagrams 28 9 6 Insulation Test 28 9 7 No Load Current Values 28 10 STANDARD REPAIR ...

Page 3: ...d lightweight design 5 Soft grip handle and side handle 6 Vario Lock mechanism 12 positions 7 Constant speed with variable speed control 8 Warning display indicating service life of carbon brushes 3 APPLICATIONS Concrete drilling Drilling anchor bolt holes Crushing chiseling grooving edging cutting stripping compacting tamping and roughing concrete surfaces Application examples Air conditioning In...

Page 4: ... speed About 1 8 times faster than the Model DH 40MA Change lever for switching between Rotation Hammering for drilling Neutral for positioning the tool tip and Hammering only for chiseling and chipping Double insulation construction Needle pin type slip clutch Indication lamp for carbon brush replacement Vibration isolating handle reduces operator fatigue Variable speed with constant speed Vario ...

Page 5: ...h allows the number of revolutions and the number of strikes to be stepless adjustable from levels 1 to 5 on 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 lo...

Page 6: ...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 hammering neutral an...

Page 7: ... switch D type handle and side handle Material Housing Glassfiber reinforced polyamide resin green Handle Handle cover Crank case cover 495 mm x 293 mm x 120 mm length x height x width 19 1 2 x 11 9 16 x 4 3 4 9 8 kg 21 6 lbs 15 2 kg 33 5 lbs Corrugated cardboard box Plastic case 1 Side handle 1 Hex bar wrench 4 mm 1 Hex bar wrench 5 mm 1 Hex bar wrench 6 mm 1 Stopper 1 Grease A 1 Voltage V Curren...

Page 8: ...4 9 16 370 14 9 16 370 14 9 16 16 5 8 19 3 4 22 7 8 25 1 28 1 1 8 32 1 1 4 38 1 1 2 40 1 9 16 Outer diameter mm Overall length mm Code No 313456 313457 313458 313459 313460 313461 313462 313463 540 21 1 4 540 21 1 4 520 20 15 32 520 20 15 32 570 22 7 16 570 22 7 16 570 22 7 16 570 22 7 16 16 5 8 19 3 4 22 7 8 25 1 28 1 1 8 32 1 1 4 38 1 1 2 40 1 9 16 1 Drill bit taper shank Outer diameter mm Code ...

Page 9: ... bit SDS plus shank 2 SDS plus shank bit adapter 3 Boring work for large diameter holes rotation hammering 1 Guide plate 2 Center pin 3 Core bit 4 Core bit shank Outer diameter mm Code No Outer diameter mm Code No 25 1 955994 75 2 15 16 959709 29 1 1 8 955995 79 3 1 8 955157 32 1 1 4 955996 94 3 11 16 956004 35 1 3 8 955998 100 3 15 16 959710 38 1 1 2 956000 105 4 1 8 955159 45 1 3 4 955154 120 4 ...

Page 10: ...r adapter 6 Demolition work hammering 1 Bull point 7 Grooving and edging hammering 1 Cold chisel 1 13 mm 1 2 drill chuck 13VLA Code No 950272 2 Chuck adapter 3 Chuck wrench Code No 313468 Code No 930515 12 7 mm 1 2 19 0 mm 3 4 Socket square size Code No 313469 313470 280 mm 11 400 mm 15 3 4 Overall length Code No 313471 313472 280 mm 11 400 mm 15 3 4 Overall length Code No 313473 313474 ...

Page 11: ...ork hammering 10 Surface roughing work hammering Code No 313477 1 Bushing tool 2 Shank 1 Rammer 2 Shank Code No 313478 150 mm x 150 mm 50 mm 2 400 mm 15 3 4 Width Code No 313475 Overall length 220 mm 8 21 32 Code No 313479 Overall length 400 mm 15 3 4 Code No 313476 Overall length 220 mm 8 21 32 Code No 313479 Overall length ...

Page 12: ...0 6 120 250 1500 1100 2250 B 120 595 23 1 2 280 11 1 32 128 5 1 16 10 8 23 8 Ibs 85 120 250 Double insulation 37 1 7 16 160 6 1 4 0 255 1050 0 2700 D 119 495 19 1 2 259 10 7 32 115 4 17 32 7 9 17 4 Ibs 84 0 255 12 Syringe for chip removal Code No 944575 500 g can Code No 980927 30 g tube Code No 981840 70 g tube Code No 308471 13 Impact drill grease Note Code numbers listed above are subject to ch...

Page 13: ...ITACHI B D HITACHI B D HITACHI B D φ 16 φ 19 φ 22 φ 25 φ 28 φ 32 φ 38 φ 40 480 380 340 430 320 290 275 250 290 225 370 225 240 190 190 160 130 120 110 110 75 60 90 90 Drill bit dia mm Maker Model Drilling speed mm min Note that the data marked with asterisks are test results using drill bits which are beyond the tool s rated capacity Use the above data as a reference for comparison purposes only T...

Page 14: ...ormance Chiseling performance varies considerably depending on the work conditions Use these factory test results shown in Fig 5 for comparison purposes only Fig 5 Test conditions Orientation Downward chiseling Test material Concrete panel with a compression strength of 2 919 N cm2 240 kgf cm2 Bull point SDS max shank bull point of 280 mm ...

Page 15: ...ingly 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 du...

Page 16: ...he Cylinder Case and 75 g in 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 ...

Page 17: ...h 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 that the piston moves reciprocally within the...

Page 18: ...ut 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...

Page 19: ...nd 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 rota...

Page 20: ...o 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 A A Key slot Dia 18 mm Key rail 3 pieces Needle roller 2 pieces Retainer sleeve Needle holder Key slot Cross section A A Tool h...

Page 21: ... 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 the 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...

Page 22: ...lug 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 wi...

Page 23: ...e ensure a lower vibration and a better more comfortable grip for a improved operability Fig 15 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 ...

Page 24: ...ontacts 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 A A Commutator Control circuit ass y Carbon brush Brush holder Guide piece Piece ass y Indicat...

Page 25: ... 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 2 pcs 51 and Spring Holder 6 to be separated from the Retainer Sleeve 52 2 Removing gears from the crank case Remove the Retaining Ring for D17 Shaft 47 and the Thrust Washer 46 from the Crank Shaft 40 Pull out the First Gear 45 with a bearing ...

Page 26: ...d 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...

Page 27: ...on as indicated in Fig 19 then press the Springs C 22 Press in the Spacer 25 and then Ball Bearing 629 26 Fig 19 Bevel Pinion 16 Second Gear 24 Gear Holder 21 Second Gear 24 Gear Holder 21 Needle Pin 23 Spring C 22 Section A A A A 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 repla...

Page 28: ...ion 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 Guide piece provided Fig 21 Handle Housing Carbon brush Guide piece not provided Carbon brush ...

Page 29: ... M5 Hex Socket Hd Bolt 7 84 N m 80 kgf cm 69 4 in lbs D4 Tapping Screw 2 0 0 5 N m 20 5 kgf cm 17 4 4 3 in lbs D5 Tapping Screw 2 9 0 49 N m 30 5 kgf cm 26 0 4 3 in lbs 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 lbs Bolt for mounting the crank case cover M5 x 16 Flanged Bolt 4 9 0 98 N m 50 10 kgf cm 43 4 8 7 in lbs Bolt for mounting the housing M6 ...

Page 30: ...40 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 Fig 22 For products with noise suppressor Stator Plug Control circuit ass y Switch Armature Connector Red Red Armature Stator Red Red Control circuit ass y Switch Plug Pillar termi...

Page 31: ...ther Key 5x5x15 Ball Bearing 6205 Bearing Cover First Gear Second Pinion Armature Ass y Ball Bearing 6203VV Dust Washer Oil Seal Sleeve B Clutch Connecting Rod Ass y Needle Bearing Piston Piston Pin Striker O Ring Bevel Pinion Key 3x3x8 Oil Seal A Ball Bearing 6202 Washer A Gear Holder Spring C Needle Pin Second Gear Spacer Ball Bearing 629VV Crank Case General Assembly Housing Ass y Stator Ass y ...

Page 32: ... 30 Assembly Diagram for DH 50MB ...

Page 33: ... BEARING 629VVC2PS2L 1 27 318 550 SLIP CLUTCH ASS Y 1 INCLUD 16 26 28 SDS MAX LABEL 1 29 945 072 FEATHER KEY 5X5X15 2 30 944 525 BEARING WASHER C 1 31 313 082 NYLOCK BOLT W FLANGE M5X16 6 32 991 711 DISTANCE PIECE B 4 33 318 584 CRANK CASE COVER ASS Y 1 INCLUD 32 34 313 084 RUBBER SEAL 1 35 318 543 CRANK CASE 1 36 980 750 GUIDE PLATE 2 37 980 727 HANDLE RUBBER 2 38 878 181 NYLOCK HEX SOCKET HD BOL...

Page 34: ...1 76 318 557 CONNECTING ROD ASS Y 1 INCLUD 77 77 980 756 NEEDLE BEARING NSK AJ50 1203 1 78 955 593 PISTON PIN 1 79 318 574 SIDE HANDLE 1 80 318 575 HANDLE HOLDER 1 81 318 576 HANDLE BOLT 1 82 971 786 STOPPER ROD 1 83 873 095 O RING P 16 1 84 318 577 LEVER SHAFT 1 85 318 578 UNDER COVER 1 86 313 411 SHAFT COVER 1 87 318 579 HEX SOCKET HD BOLT W WASHER M4X12 2 88 313 410 LEVER 1 89 307 605 SPRING 1 ...

Page 35: ...1VVCMPS2L 1 119 318 598 TAIL COVER 1 120 303 273 TAPPING SCREW W FLANGE D5X16 3 121 305 558 TAPPING SCREW W FLANGE D5X25 BLACK 4 122 318 571 SIDE COVER ASS Y 1 INCLUD 114 123 129 123 318 572 HANDLE PACKING A 1 124 991 711 DISTANCE PIECE B 4 125 318 601 HANDLE 1 126 313 093 SWITCH C 2P SCREW TYPE W O LOCK 1 127 318 602 HANDLE COVER 1 128 301 653 TAPPING SCREW W FLANGE D4X20 BLACK 2 129 318 573 HAND...

Page 36: ...313 092 PLUG A 1 FOR USA CAN 136 313 142 PLUG A 1 137 959 141 CONNECTOR 50092 10 PCS 1 FOR AUS 138 318 648 PLUG B 1 138 318 600 PLUG B 1 FOR AUS 138 318 649 PLUG B 1 FOR USA CAN 139 938 307 PILLAR TERMINAL 1 EXCEPT AUS 140 318 603 PLUG HOLDER 1 ALTERNATIVE PARTS 1 00 ...

Page 37: ...X570 1 619 313 461 DRILL BIT SDS MAX D32X570 1 620 313 462 DRILL BIT SDS MAX D38X570 1 621 313 463 DRILL BIT SDS MAX D40X570 1 622 944 460 TAPER SHANK DRILL BIT D11X100 1 623 944 461 TAPER SHANK DRILL BIT D12 3X110 1 624 993 038 TAPER SHANK DRILL BIT D12 7X110 1 625 944 462 TAPER SHANK DRILL BIT D14 3X110 1 626 944 500 TAPER SHANK DRILL BIT D14 5X110 1 627 944 463 TAPER SHANK DRILL BIT D17 5X120 1...

Page 38: ...R CORE BIT 94MM 1 663 950 479 GUIDE PLATE FOR CORE BIT 100MM 1 664 955 169 GUIDE PLATE FOR CORE BIT 105MM 1 665 956 007 GUIDE PLATE FOR CORE BIT 120MM 1 666 956 743 GUIDE PLATE FOR CORE BIT 150MM 1 667 318 530 CENTER PIN FOR CORE BIT D25 29 1 668 956 009 CENTER PIN B 147L FOR CORE BIT D32 35 1 669 955 165 CENTER PIN A 133L FOR CORE BIT D38 150 1 670 313 466 CORE BIT SHANK B SDS MAX D25 35 1 671 31...

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