Hitachi WH 12DH Technical Data And Service Manual Download Page 1

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POWER TOOLS

TECHNICAL DATA

AND

SERVICE MANUAL

CORDLESS IMPACT DRIVER

WH 12DH

CORDLESS IMPACT WRENCH

WR 12DH

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. F829, 830

Mar. 1999

MODEL

WH 12DH

WR 12DH

WH 12DH

WR 12DH

Summary of Contents for WH 12DH

Page 1: ...ICAL DATA AND SERVICE MANUAL CORDLESS IMPACT DRIVER WH 12DH CORDLESS IMPACT WRENCH WR 12DH SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No F829 830 Mar 1999 W MODEL WH 12DH WR 12DH WH 12DH WR 12DH ...

Page 2: ...s 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 Symbol Utilized Competitor Company Name Model Name C MAKITA 6914D WH 12DH Symbol Utilized Competitor Company Name Model Name C MAKITA 6911D WR 12DH ...

Page 3: ...rench 12 7 3 Tightening torque 13 7 4 Number of Screws or Bolts Driven 17 8 PRECAUTIONS IN SALES PROMOTION 19 8 1 Safety Instructions 19 8 2 Tightening Torque Inspection Prior to Operation 21 8 3 Tightening Torque Variation 21 8 4 Suggestions and precautions for the Efficient Use of the Charger 23 9 OTHER PRECAUTIONS 24 Service section 10 REPAIR GUIDE 25 10 1 Precautions in Disassembly and Reassem...

Page 4: ...product assembly Tightening loosening of wood screws Construction industry Assembly of scaffolding roofing aluminum sashes fencing etc removal of plastic cones from concrete forms mounting removal of form ties drilling into the wood frames of concrete forms etc Manufacturing industry Assembly work for automobiles rolling stock shipbuilding agricultural machinery and tools industrial machines steel...

Page 5: ...fastening torque 1 200 kgf cm 117 6 N m 86 4 ft lbs Compact body and lower center height 12 7 mm 1 2 Square drive 180 mm 7 1 8 26 mm 1 1 64 176 mm 6 15 16 26 mm 1 1 64 Compact and well balanced body for less fatigue Higher rotation speed min and higher blows min for high power and faster fastening Improved motor performance Replaceable carbon brushes for longer motor life Fan cooled rare earth mag...

Page 6: ... 1 Faster tightening speed The Model WH 12DH provides faster driving speed than the previous model thanks to the high power rare earth magnet motor and the higher moment of inertia of the hammer The comparisons with the previous Model WH 12DC and maker C s model are shown below 1 Tightening time sec Wood screw 5 5 mm dia x 120 mm length hemlock spruce 2 Tightening time sec Wood screw 4 2 mm dia x ...

Page 7: ...s 1 73 3 81 lbs 2 39 5 31 lbs 2 Compact L 176 mm 6 15 16 WH 12DH A Center hight 26 mm 43 mm B Switch position C Grip perimeter mm mm mm mm kg kg 3 Improved motor performance The Models WH 12DH and WR 12DH are compact and have high power thanks to the rare earth magnet motor Furthermore these models have better heat resistance because the built in fan enhances cooling efficiency Their motors have r...

Page 8: ...utside of the brush tube Claw of carbon brush Collar of carbon brush Connecting portion at the outside of brush tube 5 Safe handle shape Compared with the previous WH 12DC the housing of the Model WH 12DH produces no clearance caused by vibration because grips R and F made of rubber are provided at the juncture of the handle and the housing is secured with two screws at the center of the handle to...

Page 9: ... x 245 mm 9 21 32 Battery Type EB 12H Sealed cylindrical nickel metal hydride batteries Nominal voltage DC 12V Nominal life Charging discharging approximately 500 cycles in case of Model UC 14YF2 Nominal capacity 2 200 mAh 1 In the case of tapping screws and wood screws a minimum of M3 1 8 is possible 2 This torque is based on tightening an M12 15 32 bolt strength grade 12 9 for 3 sec with a hexag...

Page 10: ...al Accessories 1 Optional accessories for the Model WH 12DH Plus driver bit 50 mm 2 Bit No No 2 No 3 Code No 992671 992672 Hexagon socket L B Stamped figures 996177 8 5 16 65 2 9 16 8 Stamped figures 5 mm Hexagon socket Part Name L mm B mm Code No 985329 10 3 8 65 2 9 16 10 6 mm Hexagon socket 996178 12 15 32 65 2 9 16 12 5 16 Hexagon socket 996179 13 1 2 65 2 9 16 13 8 mm Hexagon socket 996180 14...

Page 11: ...16 32 1 1 4 34 1 11 32 36 1 13 32 40 1 9 16 B B B B C C D D 10 3 8 12 15 32 13 1 2 14 9 16 17 21 32 19 23 32 21 53 64 22 7 8 W 5 16 W 3 8 W 7 16 W 1 2 M 8 5 16 M 10 3 8 M 12 15 32 M 14 9 16 M 16 5 8 M 6 1 4 M 8 5 16 M 10 3 8 M 12 15 32 M 14 9 16 M 12 15 32 944291 873632 873539 873540 873536 873624 873626 873627 10 mm 12 mm 13 mm 14 mm 17 mm 19 mm 21 mm 22 mm Hexagon socket 12 7 mm 1 2 Square drive...

Page 12: ... 12 mm 13 mm 14 mm 17 mm 17 mm 19 mm 19 mm 21 mm 21 mm 21 mm 22 mm Long socket 12 7 mm 1 2 Square drive dimension Sq Part Name Code No Nominal diameter of applicable bolts Dihedral width H mm Shape Socket primary dimensions mm ISO high strength ISO ordinary ISO small type Inch screw L L1 D1 Bit adaptor Code No 991476 6 35 mm 1 4 45 mm 1 25 32 13 5 mm dia 17 32 12 7 mm 1 2 34 1 11 32 34 1 11 32 34 ...

Page 13: ...o 307824 Use the holster to hold the unit during its operation Carefully read the warnings attached to the holster for safe use Hook Code No 308090 Use the hook to hold the unit during its operation Carefully read the instructions that come with the hook to learn how to use it ...

Page 14: ... 1 64 26 1 1 64 26 1 1 64 Center height mm 1 73 3 8 lbs 1 73 3 8 lbs 1 73 3 8 lbs Main body weight kg 69 69 69 No load sound pressure level dB A Driver chuck Driver chuck Driver chuck Tool tip mounting system Variable speed switch with forward reverse changeover lever Type of switch Variable speed switch with forward reverse changeover lever Variable speed switch with forward reverse changeover le...

Page 15: ... 1 5 16 Center height mm 1 73 3 8 lbs 2 3 5 1 lbs 1 94 4 3 lbs Main body weight kg 69 65 72 No load sound pressure level dB A Pin O ring or plunger Pin O ring or plunger Tool tip mounting system Variable speed switch with forward reverse changeover lever Type of switch Variable speed switch with forward reverse changeover lever Variable speed switch with forward reverse changeover lever DC magnet ...

Page 16: ...f these models Accordingly the data in the figures below are intended for reference purposes only Fig 4 1 Fig 4 2 Test conditions Bolt M12 x 45 mm 15 32 x 1 25 32 strength grade 12 9 Steel plate Mild steel thickness 25 mm 1 Accessory tool Hexagon socket Bolt M14 x 50 mm 9 16 x 2 strength grade 12 9 Steel plate Mild steel thickness 25 mm 1 Accessory tool Hexagon socket HITACHI WH 12DH HITACHI WH 12...

Page 17: ...fficient 0 17 Strength grade and rated axial stress of threads Strength grade Rated axial stress kgf mm2 Material Heat treatment 4 8 6 8 8 8 12 9 29 1 43 7 58 2 95 Mild steel Alloy steel including Ni Mn Cr etc None Processed hard material Diameter and effective sectional areas of threads Kind of thread x pitch Effective sectional area of thread mm2 M5 x 0 8 mm 3 16 14 2 M6 x 1 mm 1 4 20 1 M8 x 1 2...

Page 18: ...s were utilized Ordinary bolt strength grade 4 8 High strength bolt strengh grade 12 9 Strength grade is read as follows 4 8 Yield point or durable force 45 500 psi Tensile strength of the bolt 56 900 psi Ordinary bolt High strength bolt 5 16 x 1 3 6 M8 x 30 mm Tightening time sec steel plate thickness t 3 8 10 mm 200 19 6 N m 14 ft lbs 400 39 2 N m 29 ft lbs 600 58 8 N m 43 ft lbs 800 78 4 N m 58...

Page 19: ...bolt 15 32 x 1 3 4 M12 x 45 mm Tightening time sec steel plate thickness t 1 25 mm 200 19 6 N m 14 ft lbs 400 39 2 N m 29 ft lbs 600 58 8 N m 43 ft lbs 800 78 4 N m 58 ft lbs 1000 98 N m 72 ft lbs 1200 117 6 N m 86 ft lbs kgf cm Tightening torque 0 0 1 2 3 Ordinary bolt High strength bolt 8 8 x 1 3 6 M10 x 30 mm Tightening time sec steel plate thickness t 3 8 10 mm 200 19 6 N m 14 ft lbs 400 39 2 ...

Page 20: ...ver Battery Tightening condition Model HITACHI WH 12DH HITACHI WH 12DC C EB 12B EB 12B 1222 Corresponding EB 12B Wood screw 3 8 mm dia x 20 mm soft wood 820 800 820 Wood screw 4 5 mm dia x 50 mm soft wood 450 450 450 Wood screw 4 2 mm dia x 75 mm soft wood 270 270 270 Machine screw M8 x 16 mm 1 400 1 400 1 400 Machine screw M8 x 25 mm 1 230 1 230 1 230 Tex screw 4 0 mm dia x 13 mm SPCC t 1 6 210 2...

Page 21: ...ry charge in the case of the EB 12B Tightening time is defined as the period of time elapsed from the commencement of the screw tightening operation to the completion As it can be seen when the tightening time is prolonged the number of screws which can be tightened per charge is decreased Please note that the data below are intended for general reference only as the number of screws which can be ...

Page 22: ...icated on the unit If this order is reversed the charger may not function properly 4 Ensure the power source voltage is the same as that indicated on the Name Plate of the charger Use of any other power source DC outlet fuel powered generator etc will cause the charger to overheat and burn out 5 Do not use any voltage increasing equipment transformer etc between the power source and the charger If...

Page 23: ... into any Hitachi power tool sales outlet or authorized service center when they are no longer capable of being recharged or repaired If thrown into a fire the batteries may explode or if discarded indiscriminately leakage of the cadmium compound contained in the battery may cause environmental pollution B Caution Plates 1 The following precautions are listed on the Name Plate attached to the main...

Page 24: ...he tightening time is prolonged for such bolts and screws it could cause damage to their threads or in the worst case cause them to be sheared off This phenomenon is common to all existing impact drivers Particularly when tightening M6 1 4 or smaller screws tightening time must be kept extremely short 0 5 seconds or less The customer should be advised to carry out several screw tightening operatio...

Page 25: ...Different bolt diameter Differences in bolt diameter will cause variation of the required levels of tightening torque Generally speaking tightening torque is higher for large bolts 4 Different materials being tightened When a bolt is tightened into a soft material such as aluminum plastic wood etc the tightening torque is considerably less than when the bolt is tightened into a hard material such ...

Page 26: ...icient Use of the Charger 1 Batteries may not be rechargeable immediately after use If the Model EB 12B or EB 12H Storage Batteries are exposed to direct sunshine for an extended period or if the temperature of the batteries is 40 C 104 F or higher immediately after they have been used in the tool the pilot lamp may not light up when the batteries are connected to the Model UC 14YF or UC 14YF2 Cha...

Page 27: ... bolts or nuts it will not only cause insufficient tightening torque but could also easily cause damage to the socket Please refer to the tables in Para 6 2 for appropriate socket dimensions 3 Hammering section lubrication Grease ATTOLUB MS No 2 is utilized in the hammering section Frequent or continuous use of the tool will cause excessive temperature rise of the hammering section resulting in de...

Page 28: ...B Set 28 26 2 Removal of Housing B Remove the seven Tapping Screws D4 x 20 26 24 from the main body to remove Housing B 3 Remove the DC Speed Control Switch 30 28 the Fin Ass y 32 30 the Motor 23 21 Grip F 33 31 and Grip R 37 35 together Remove the Pushing Button 31 29 and the Strap 35 33 4 Disassembly of the switch ass y Remove the two Machine Screws M3 x 5 29 27 that secure the flag terminal and...

Page 29: ...e screwdriver until it is free The Guide Sleeve 4 can now be removed Avoid quickly raising the retaining ring or it may fly out forcefully The retaining ring can also be easily removed by widening the gap of the retaining ring with the jig for retaining ring and slowly raising the retaining ring with a small flat blade screwdriver 6 Hammer 10 7 Push down Spindle 15 13 Spring 12 10 Stopper 14 12 Wa...

Page 30: ...1 for proper wiring b When connecting the internal wires of the Motor 23 21 to the DC Speed Control Switch 30 28 tightly fasten them with the Machine Screw M3 x 5 29 27 paying close attention to the direction of the flag terminal Fig 12 2 c Mount the Motor 23 21 into Housing A so that the CB cap of the Motor 23 21 and the rib for preventing motor body from rotating fit in Housing A Note Make sure ...

Page 31: ...urple Motor Pinion Black Purple Fin Ass y 32 30 FET S Tight Screw 36 34 D3 5 x 6 Flag terminal Machine screw 29 27 M3 x 5 DC Speed Control Switch 30 28 Projection of forward reverse lever Internal wire black Schematic diagram viewed from A ...

Page 32: ... 18 16 the Ball Bearing 20 18 the Inner Cover 21 19 and the Damper 22 20 to the above reassembly Furthermore mount the other mechanical parts and Anvil B 8 or Anvil K Ass y 4 then the Hammer Case 6 2 When mounting Anvil B 8 use the J 296 anvil cap Fig 13 Note The oil seal may be turned inside out if the anvil cap is not used 4 Mounting the assembly from the Hammer Case 6 2 to Inner Cover 21 19 to ...

Page 33: ...al Two Steel Balls D5 556 9 6 Pinion tooth flanks of the Motor 23 21 Tooth flanks of the Ring gear 18 16 Twenty five Steel Balls D3 5 7 8 b HITACHI MOTOR GREASE No 29 for WH 12DH only Steel Ball D3 5 7 Sliding section of Anvil B 8 and the Guide Sleeve 4 8 Screw tightening torque Tapping Screw with sp washer D4 x 30 20 5 kgf cm 1 96 0 49 N m 1 44 0 36 ft lbs Tapping Screw with flange D4 x 20 20 5 k...

Page 34: ...ow Inner Cover Motor O Ring Rubber Ring Handle Cover Switch Terminal Piece Hammer Case Washer Anvil Ring Gear Housing General Assembly WR 12DH Steel Ball Hammer Ass y Spring Sheet Spring Spindle Idle Gear Needle Roller Ball Bearing 6001 Fixed Cost Handle Cover Switch Terminal Piece Others 0 min 20 min ...

Page 35: ... 32 Assembly Diagram for WH 12DH ...

Page 36: ... 455 WASHER C 1 20 600 1VV BALL BEARING 6001VVCMPS2L 1 21 316 167 INNER COVER 1 22 310 319 DAMPER 1 23 316 173 MOTOR 1 24 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 2 25 316 180 BRUSH CAP 1 26 302 086 TAPPING SCREW W FLANGE D4X20 BLACK 7 27 NAME PLATE 1 28 317 340 HOUSING A B SET 1 INCLUD 33 37 29 994 532 MACHINE SCREW W SP WASHER M3X5 2 30 316 783 DC SPEED CONTROL SWITCH 1 31 316 166 PUSHING BUTTON 1 3...

Page 37: ...ETIC HEX SOCKET 10MM 65L 1 605 996 178 NON MAGNETIC HEX SOCKET 12MM 65L 1 606 996 179 NON MAGNETIC HEX SOCKET 13MM 65L 1 607 996 180 NON MAGNETIC HEX SOCKET 14MM 65L 1 608 996 181 NON MAGNETIC HEX SOCKET 16MM 65L 1 609 996 182 NON MAGNETIC HEX SOCKET 17MM 65L 1 610 996 197 HEX SOCKET LONG 21MMX166L 1 611 996 195 DRILL CHUCK AND ADAPTER SET 1 INCLUD 612 613 612 930 119 CHUCK WRENCH 6 5G 1 613 307 5...

Page 38: ... 35 Assembly Diagram for WR 12DH ...

Page 39: ...8 600 1VV BALL BEARING 6001VVCMPS2L 1 19 316 167 INNER COVER 1 20 310 319 DAMPER 1 21 316 173 MOTOR 1 22 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 2 23 316 180 BRUSH CAP 2 24 302 086 TAPPING SCREW W FLANGE D4X20 BLACK 7 25 NAME PLATE 1 26 317 340 HOUSING A B SET 1 INCLUD 31 35 27 994 532 MACHINE SCREW W SP WASHER M3X5 2 28 316 783 DC SPEED CONTROL SWITCH 1 29 316 166 PUSHING BUTTON 1 30 316 179 FIN ASS...

Page 40: ...G NTN BK1012 1 610 948 227 RETAINING RING FOR D47 HOLE 1 611 955 307 PINION 1 612 955 308 SLEEVE 1 613 955 309 WASHER 1 614 955 310 SOCKET COVER 1 615 955 311 SOCKET 1 616 303 247 SEAL LOCK HEX SOCKET HD BOLT M5X25 6 617 873 537 SOCKET PIN 1 618 873 187 O RING J1SW1516 1 619 991 481 FORM TIE SOCKET ASS Y 10MMX95L 1 INCLUD 617 618 620 992 610 UNIVERSAL JOINT ASS Y 1 INCLUD 617 618 621 955 153 UNIVE...

Page 41: ...INCLUD 617 618 639 955 150 HEX SOCKET ASS Y LONG 19MMX75L 1 INCLUD 617 618 640 955 143 HEX SOCKET ASS Y LONG 21MMX52L 1 INCLUD 617 618 641 955 144 HEX SOCKET ASS Y LONG 22MMX52L 1 INCLUD 617 618 642 991 480 HEX SOCKET ASS Y LONG 21MMX125L 1 INCLUD 617 618 643 873 633 EXTENSION BAR ASS Y SQUARE 12 7MMX100L 1 INCLUD 617 618 644 992 613 SOCKET ASS Y FOR DUCT 13MMX95L 1 INCLUD 617 618 645 645 992 614 ...

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