Hitachi WH 12DMR Technical Data And Service Manualice Manual Download

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TECHNICAL DATA

AND

SERVICE MANUAL

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST Nos. WH 12DMR: G814

WR 12DMR: G821

Revised Jun. 2005

MODELS

WH 12DMR
WR 12DMR

Hitachi

Power Tools

CORDLESS IMPACT DRIVER

WH 12DMR

CORDLESS IMPACT WRENCH

WR 12DMR

WH 12DMR

WR 12DMR

Summary of Contents for WH 12DMR

Page 1: ...FICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST Nos WH 12DMR G814 WR 12DMR G821 Revised Jun 2005 W MODELS WH 12DMR WR 12DMR Hitachi Power Tools CORDLESS IMPACT DRIVER WH 12DMR CORDLESS IMPACT WRENCH WR 12DMR WH 12DMR WR 12DMR ...

Page 2: ... 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 WH 12DMR Symbol Utilized Competitor Company Name Model Name WR 12DMR P1 DEWALT DW051 P2 DEWALT DW053 P DEWALT DW052 ...

Page 3: ... 4 Tightening Time 17 7 5 Number of Screws or Bolts Driven 18 8 PRECAUTIONS IN SALES PROMOTION 19 8 1 Safety Instructions 19 8 2 Tightening Torque Inspection Prior to Operation 22 8 3 Tightening Torque Variation 22 8 4 Suggestions and Precautions for the Efficient Use of the Charger 23 9 OTHER PRECAUTIONS 24 10 REPAIR GUIDE 25 10 1 Precautions in Disassembly and Reassembly 25 10 2 Precautions in D...

Page 4: ...c Drilling into wood and various other materials with use of optional accessory drill chuck adapter Applicable Markets Wood 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 ...

Page 5: ... body 155 mm and lightweight 1 6 kg P 165 mm 1 7 kg High durability dust resistance and long service life Common to the Model WH 12DM2 Advanced case Replaceable carbon brushes Common to the Model WH 12DM2 Convenient light equipped hook Common to the Model WH 12DM2 Protector is standard Common to the Model WH 12DM2 Common to the Model WH 12DM2 ...

Page 6: ...htening torque 160 N m P 158 N m High durability dust resistance and long service life Common to the Model WH 12DM2 Replaceable carbon brushes Common to the Model WH 12DM2 Convenient light equipped hook Common to the Model WH 12DM2 Protector is standard Common to the Model WH 12DM2 Advanced case Common to the Model WH 12DM2 ...

Page 7: ...ing M12 bolts continuously Cycle of operation 5 second impacting and 10 second stopping 3 0 Ah battery used The heat resistance comparison between the Models WH 12DMR WR 12DMR and P is shown below The cooling efficiency is improved thanks to the powerful full fledged large radial fan and the computer analyzed air ducts Thus the Models WH 12DMR WR 12DMR are protected from burnout due to long time c...

Page 8: ... Tightening torque Selling points of the Model WR 12DMR Powerful tightening torque 160 N m 1630 kgf cm 1420 in lbs Although the Model WR 12DMR is equipped with an anisotropic bonded magnet that is cheaper than that of the Model WR 12DM2 the performance is almost equivalent to the Model WR 12DM2 thanks to the large hammer and the optimized impact timing Comparison of measured data with the Model WR...

Page 9: ...gf cm 170 154 163 WR 12DMR 12 V 162 160 180 200 0 1800 1562 in lbs 2000 1736 in lbs N m P2 12 V 400 347 in lbs 800 694 in lbs 1200 1042 in lbs 1600 1389 in lbs 200 174 in lbs 1000 868 in lbs 600 521 in lbs 1400 1215 in lbs Fig 4 3 Sinking time comparison square washers Figure 4 shows the time required for tightening an M12 bolt into a pine laminated lumber of 105 mm square until the square washers...

Page 10: ...l voltage DC 12V Nominal life Charging discharging approximately 300 cycles in the case of Model UC 18YG Nominal capacity 2 0 Ah 12 7 mm 1 2 square drive 162 mm 6 3 8 x 226 mm 8 29 32 9 5 mm 3 8 square drive 159 mm 6 1 4 x 226 mm 8 29 32 Battery Type EB 1226HL EB 1230HL Sealed cylindrical nickel metal hydride batteries Nominal voltage DC 12V Nominal life Charging discharging approximately 500 cycl...

Page 11: ...rength grade 12 9 for 3 seconds with a hexagonal socket 3 This torque is based on tightening an M16 5 8 bolt F10T for 3 seconds with a hexagonal socket 4 Main body does not include accessory tools and hook hexagonal bit etc Prior to charging During charging Charging completed Charging not possible High battery temperature Blinks Lit Blinks Flickers Lit 0 5 sec ON 0 5 sec OFF Stays ON constantly 0 ...

Page 12: ...5 2 9 16 12 5 16 Hexagon socket 996179 13 1 2 65 2 9 16 13 8 mm Hexagon socket 996180 14 9 16 65 2 9 16 14 10 mm Hexagon socket small type 996181 16 5 8 65 2 9 16 16 10 mm Hexagon socket 996182 17 21 32 65 2 9 16 17 10 mm Hexagon socket 996197 21 53 64 166 6 17 32 21 1 2 Hexagon long socket Woodworking drill bit Code No 959183 14 mm dia 35 64 83 mm 3 17 64 Drill chuck adaptor set Code No 996195 Th...

Page 13: ...3536 873624 873626 873627 873629 Hexagon 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 L M 6 1 4 M 8 5 16 M 10 3 8 M 12 15 32 M 14 9 16 M 16 5 8 M 8 5 16 M 10 3 8 M 12 15 32 M 14 9 16 M 16 5 8 M 18 23 32 L1 8 5 16 8 5 16 9 11 32 9 11 32 8 5 16 9 11 32 10 3 8 14 9 16 15 9 16 D1 18 23 32 20 2...

Page 14: ...ket primary dimensions mm L L1 20 25 32 20 25 32 20 25 32 24 15 16 24 15 16 24 15 16 24 15 16 24 15 16 24 15 16 24 15 16 24 15 16 25 63 64 D1 20 25 32 21 5 53 64 22 7 8 25 1 25 1 28 1 3 32 28 1 3 32 31 1 7 32 31 1 7 32 31 1 7 32 32 5 1 9 32 34 1 11 32 L2 ISO Ordinary ISO Small type Inch screw ISO High strength M 8 5 16 M 10 3 8 M 10 3 8 M 12 15 32 M 12 15 32 M 14 9 16 M 16 5 8 M 8 5 16 M 10 3 8 M ...

Page 15: ...is possible 2 Max tightening torque is based on tightening an M14 9 16 bolt strength grade 12 9 for 3 seconds with a hexagon socket 3 Main body weight does not include accessory tools and hook hexagon bit etc 4 Max tightening torque is based on tightening an M14 9 16 bolt strength grade 12 9 for 3 seconds with a hexagon socket M 4 M 8 5 32 5 16 WH 12DMR M 5 M 12 3 16 15 32 M 5 M 10 3 16 3 8 130 13...

Page 16: ...5 8 WR 12DMR M 6 M 12 1 4 15 32 160 1 1630 kgf cm 1420 in lbs 0 2 600 0 3 200 1 6 3 5 lbs 163 1660 kgf cm 1440 in lbs 0 2 480 0 2 680 26 5 1 1 64 1 69 3 7 lbs 70 9 5 mm 3 8 Retaining ring 12 7 mm 1 2 Plunger Variable speed switch with forward reverse changeover lever DC magnet 12 28 EB 1220BL EB 1230HL or EB 1226HL EB 1220BL 2 0 EB 1226HL 2 6 EB 1230HL 3 0 12 5 40 UC 14YFA or UC 18YG UC 14YFA 56 U...

Page 17: ...lt Steel plate SS34P Thickness 25 mm Accessory tool Hexagon socket length 40 mm width across flat 19 mm 2 Impact wrench Test conditions Bolt M16 x 55 mm 5 8 x 2 5 32 F10T Steel plate Mild steel Thickness 25 mm Accessory tool Hexagon socket ass y 1 Impact driver WR 12DM2 0 1 2 3 P1 120 100 80 20 40 60 0 0 140 200 180 160 WR 12DMR P2 200 174 in lbs 400 347 in lbs 600 521 in lbs 800 694 in lbs 1000 8...

Page 18: ...cient 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 25 m...

Page 19: ...Torque Variation NOTE The term tightening time indicates the impact time after the lower surface of the bolt has come in contact with the material into which it is being tightened In the tightening conditions shown in Figs 6 1 and 6 2 the screws are being tightened directly into a steel plate accordingly the torque goes up very abruptly in comparison with ordinary bolt tightening conditions Fig 6 ...

Page 20: ... Tightening Time The tightening speed is almost equivalent to the Model WH 12DM2 that is fastest in the class Tightening time comparison is shown below The data below are intended for reference purposes only because actual tightening time may vary depending on hardness of the workpiece ambient temperature characteristics of the battery etc 2 Wood screw 4 5 mm dia x 90 mm length hemlock spruce 3 Wo...

Page 21: ... charge will vary slightly depending on screw tightening conditions screw sizes ambient temperatures and the charging capacity of the battery Number of screws or bolts driven Cordless impact driver Battery Tightening condition Model HITACHI WH 12DM2 HITACHI WH 12DMR EB 1220BL Nominal capacity 2 0 Ah EB 1220BL Nominal capacity 2 0 Ah Wood screw 4 0 mm dia x 50 mm soft wood 525 560 Wood screw 4 2 mm...

Page 22: ...der 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 the charger is used with vol...

Page 23: ...ed 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 or Caution Plate a...

Page 24: ...isted on the Name Plate attached to the Model UC 14YFA or UC 18YG Charger UC 18YG For the U S A and Canada CAUTION For safe operation see instruction manual CAUTION For safe operation see Instruction Manual Charge HITACHI rechargeable batteries Type EB 7 EB 9 EB 12 and EB 14 series Other types of batteries may burst causing personal injury and damage Charge between 32 and 104 ûF Rest 15 minutes be...

Page 25: ...e driver at the beginning of the tightening operations and as necessary during the tightening operations In addition the torque values shown in Para 7 3 2 above are useful as a handy reference and may be utilized as tentative standards 1 Voltage of battery Tightening torque is affected by the voltage output of the battery For example the relationship between tightening torque and the number of M16...

Page 26: ...on of the driver chuck which is fitted onto the anvil in the main body will become worn and loose Wear and looseness will cause a proportionate loss of tightening torque In addition use of an incorrect size socket slightly larger than the bolt being tightened will also result in decreased torque 7 Bolt and nut rotate together Tightening torque that can be achieved will be considerably decreased if...

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 Molub Alloy 777 1 is utilized in the hammering section Frequent or continuous use of the tool will cause excessive temperature rise of the hammering section resulting in d...

Page 28: ...der by following the procedure shown in Figs 8 1 to 8 4 Be sure not to lose the two Steel Balls D3 5 9 in Anvil F 10 Hold the body and adjust the gap of the retaining ring to the groove of anvil F then insert a small flat blade screwdriver into the groove at an angle Press down washer D with the small flat blade screwdriver Fig 8 2 Fig 8 1 1 2 Small flat blade screwdriver Anvil F 10 Retaining Ring...

Page 29: ...topper 17 14 with a small flat blade screwdriver then release the hand press See Fig 9 Remove the hammer assembly from the J 297 base for washer S and support the end surface of Spindle D 18 15 With a hand press push down either of the raised faces of Hammer D 12 9 to compress Hammer Spring D 15 12 In this position extract the two Steel Balls D5 556 11 8 from the cam grooves of Spindle D 18 15 and...

Page 30: ...r Cover A 25 22 Armature Ass y DC 12V 26 23 Magnet E 28 25 Brush Block 30 27 and DC Speed Control Switch 37 34 can be removed in a piece Pushing Button A 38 35 can also be removed NOTE Be careful not to break the three legs coming from the FET to avoid malfunction of the switch 9 Removal of the switch assembly Remove the two Machine Screws W Sp Washer M3 x 5 36 33 that secure the flag terminal and...

Page 31: ...y DC 12V 26 23 With a hand press push down the tip portion of the Armature Ass y DC 12 V 26 23 pinion to remove it 12 Removal of Ring Gear C 21 18 and the Damper 24 21 Remove Ring Gear C 21 18 from Inner Cover A 25 22 and remove the Damper 24 21 with a small flat blade screwdriver Ring Gear C 21 18 is firmly inserted in Inner Cover A 25 22 Insert a small flat blade screwdriver between Ring Gear C ...

Page 32: ...rnal wires of the Brush Block 30 27 to the DC Speed Control Switch 37 34 fasten them with the Machine Screw W Sp Washer M3 x 5 36 33 paying attention to the direction of the flag terminal Fig 13 DC Speed Control Switch 37 34 Internal wire red Internal wire black FET Brush Block 30 27 Machine Screw W Sp Washer M3 x 5 36 33 Flag terminal Fig 13 C c Before mounting the parts to housing A apply silico...

Page 33: ... diameter of the Side Yoke 27 24 to the outside diameter of Magnet E 28 25 when mounting the Side Yoke 27 24 to Magnet E 28 25 see Fig 15 Insert the two Dampers 24 21 so that they fit into Inner Cover A 25 22 Fit the locking rib of Ring Gear C 21 18 to the concave portion of Damper 24 21 Press fit the Armature Ass y DC 12V 26 23 into Inner Cover A 25 22 Adjust the convex portion of Dust Guard Fin ...

Page 34: ...replace the terminal support with new one Code No 323710 Otherwise heat is generated due to contact failure and the battery or the main body may be faulty 3 Mounting the mechanical parts a Mount Hammer D 12 9 containing the twenty eight Steel Balls D3 175 13 10 Washer J 14 11 and Hammer Spring D 15 12 to Spindle D 18 15 b Align the top of the cam groove on Spindle D 18 15 with the steel ball guide...

Page 35: ... 18 15 Cover it with the Hammer Case 8 4 and secure with the four Tapping Screws W Sp Washer D4 x 25 Black 7 3 Insert the two Steel Balls D3 5 9 into the hole of Anvil F 10 Mount Guide Sleeve D 4 Guide Spring B 3 and Washer D 2 in sequence Mount the Retaining Ring 1 into the groove of anvil using the J295 jigs A and B for retaining ring as illustrated in Fig 19 7 Reassembly of the hook Check that ...

Page 36: ...f Spindle D 18 15 5 mm diameter hole of Idle Gear Set 19 16 All around the Needle Roller 20 17 Twenty eight Steel Balls D3 175 13 10 10 Screw tightening torque Tapping Screw W Sp Washer D4 x 25 Black 7 3 1 96 0 49 N m 20 5 kgf cm 17 4 4 3 in lbs Tapping Screw W Flange D4 x 20 Black 33 30 1 96 0 49 N m 20 5 kgf cm 17 4 4 3 in lbs Machine Screw W Washers M4 x 25 46 44 1 27 1 96 N m 13 to 20 kgf cm 2...

Page 37: ...ariable WH 12DMR Work Flow Inner Cover A Armature Ass y Magnet E Brush Block Hook Ass y Hammer Case Anvil F Ring Gear C Housing A B Set General Assembly Hammer D Steel Ball D3 175 Hammer Spring D Spindle D Idle Gear Set Needle Roller Ball Bearing 6901VV Guide Sleeve D DC Speed Control Switch ...

Page 38: ...k Flow Inner Cover A Armature Ass y Magnet E Brush Block Hook Ass y Hammer Case Anvil R Ass y Ring Gear C Housing A B Set General Assembly WR 12DMR Hammer D Steel Ball Hammer Spring D Spindle D Idle Gear Set Needle Roller Ball Bearing 6901VV DC Speed Control Switch ...

Page 39: ...NO G814 CORDLESS IMPACT DRIVER Model WH 12DMR 2005 6 10 E2 Hitachi Power Tools 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 36 39 40 41 42 43 44 45 46 47 48 49 501 502 502 ...

Page 40: ...LL BEARING 6901VVCMPS2L 1 24 319 909 DAMPER 2 25 321 664 INNER COVER A 1 26 360 641 ARMATURE ASS Y DC 12V 1 27 322 719 SIDE YOKE 1 28 322 723 MAGNET E 1 29 322 720 DUST GUARD FIN B 1 30 321 662 BRUSH BLOCK 1 31 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 2 32 319 918 BRUSH CAP 2 33 302 086 TAPPING SCREW W FLANGE D4X20 BLACK 7 34 NAME PLATE 1 35 323 019 HOUSING A B SET RED 1 35 322 725 HOUSING A B SET GRE...

Page 41: ... ALTERNATIVE PARTS 3 ITEM NO CODE NO DESCRIPTION REMARKS NO USED PARTS 6 05 WH 12DMR 49 323 226 BATTERY EB 1226HL W ENGLISH N P 2 49 320 388 BATTERY EB 1230HL W ENGLISH N P 2 ...

Page 42: ...DRIVER BIT B NO 3 50L 1 603 996 177 NON MAGNETIC HEX SOCKET 8MM 65L 1 604 985 329 NON MAGNETIC 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 1 611 321 ...

Page 43: ...IST NO G821 CORDLESS IMPACT WRENCH Model WR 12DMR 2005 4 1 E1 Hitachi Power Tools 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 33 36 37 38 39 40 41 42 43 44 45 46 47 501 502 502 ...

Page 44: ...MPS2L 1 21 319 909 DAMPER 2 22 321 664 INNER COVER A 1 23 360 641 ARMATURE ASS Y DC 12V 1 24 322 719 SIDE YOKE 1 25 322 723 MAGNET E 1 26 322 720 DUST GUARD FIN B 1 27 321 662 BRUSH BLOCK 1 28 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 2 29 319 918 BRUSH CAP 2 30 302 086 TAPPING SCREW W FLANGE D4X20 BLACK 7 31 NAME PLATE 1 32 324 282 HOUSING A B SET 1 33 994 532 MACHINE SCREW W SP WASHER M3X5 2 34 319 9...

Page 45: ...ARING RACE 2 608 955 304 NEEDLE THRUST BEARING NTA 1413 2 609 955 305 COVER 1 610 955 306 NEEDLE BEARING NTN BK1012 1 611 948 227 RETAINING RING FOR D47 HOLE 1 612 955 307 PINION 1 613 955 308 SLEEVE 1 614 955 309 WASHER 1 615 955 310 SOCKET COVER 1 616 955 311 SOCKET 1 617 303 247 SEAL LOCK HEX SOCKET HD BOLT M5X25 6 618 873 537 SOCKET PIN 1 619 873 187 O RING J1SW1516 1 620 991 481 FORM TIE SOCK...

Page 46: ... 619 638 955 150 HEX SOCKET ASS Y LONG 19MMX75L 1 INCLUD 618 619 639 955 143 HEX SOCKET ASS Y LONG 21MMX52L 1 INCLUD 618 619 640 955 151 HEX SOCKET ASS Y LONG 21MMX75L 1 INCLUD 618 619 641 991 480 HEX SOCKET ASS Y LONG 21MMX125L 1 INCLUD 618 619 642 955 144 HEX SOCKET ASS Y LONG 22MMX52L 1 INCLUD 618 619 643 986 058 HEX SOCKET FOR PLASTIC CONE 12MMX70L 1 INCLUD 618 619 644 873 633 EXTENSION BAR AS...

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