Hitachi WR12DMB - 12.0 V 1/2" Impact Wrench 2 Battery, Service Manual

Page 1: ...RDLESS IMPACT DRIVER WH 12DM CORDLESS IMPACT WRENCH WR 12DM SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST Nos WH 12DM F862 WR 12DM F864 Oct 2001 W MODEL WH 12DM WH 12DM WR 12DM WR 12DM EB1220BL 2 0Ah WH12DM EB1220BL 2 0Ah WR12DM ...

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 6916D WH 12DM Symbol Utilized Competitor Company Name Model Name C MAKITA 6918D WR 12DM ...

Page 3: ...ghtening Speed 23 7 5 Number of Screws or Bolts Driven 24 7 6 Actual Noise When Tightening Wood Screws and Bolts 25 8 PRECAUTIONS IN SALES PROMOTION 26 8 1 Safety Instructions 26 8 2 Tightening Torque Inspection Prior to Operation 28 8 3 Tightening Torque Variation 28 8 4 Suggestions and Precautions for the Efficient Use of the Charger 29 9 OTHER PRECAUTIONS 30 10 REPAIR GUIDE 31 10 1 Precautions ...

Page 4: ... m It is substantially higher than the previous Model WR 12DH and equivalent to the tightening torque of our higher class 14 4 V cordless impact wrench 3 APPLICATIONS Tightening loosening of small screws tapping screws wood screws bolts nuts etc Drilling into wood and various other materials with use of optional accessory drill chuck adapter Applicable Markets Wood product assembly Tightening loos...

Page 5: ...ectable from three types high capacity NiMH battery light weight NiMH battery and NiCad battery Conventional stand up batteries EB 12B etc are also usable 1 5 times higher capacity NiCad Conventional batteries are usable B type batteries Powerful Low operating noise Powerful tightening thanks to the large hammer Noise level of the Model WH 12DM compared with the previous model When tightening wood...

Page 6: ... hook Stable flat battery interchangeable High durability dust resistance and long service life 2 Cordless Impact Driver WR 12DM Compact body Overall length of the Model WR 12DM compared with the previous model WR 12DH 8 mm C 3 mm Powerful tightening torque 150 N m 1530 kgf cm 1330 in lbs WR 12DH 118 N m 1200 kgf cm 1040 in lbs C 120 N m WR 14DH 14 4 V product 147 N m 1500 kgf cm 1302 in lbs ...

Page 7: ... convenient for working in narrow places The weight of the Models WH 12DM WR 12DM is heavier than C by about 80 g because they are equipped with the hook and the gears and the motor are strengthened to enhance the durability and the performance The Models WH 12DM WR 12DM are easy to handle and well balanced thanks to the change of the handle angle from 5 to 10 to cope with the user demand C 15 Thi...

Page 8: ...rge radial fan and the computer analyzed air ducts Thus the Models WH 12DM WR 12DM are protected from burnout due to long time continuous use and decrease in speed due to temperature rise The motor is manufactured using the latest facilities in Yamagata Plant 0 50 100 150 200 250 C HITACHI WH 12DM Temperature 1 battery 2 batteries 3 batteries Burnout C Smoking As shown in the above graph C produce...

Page 9: ...e high durability against heavy loads The air inlet is minimized and the powerful fan discharges dust if entered Seal Dust resistance is improved thanks to the contact seal bearings The labyrinth construction ensures protection against dust Labyrinth 3 Improved service life and durability Although the service life may vary depending on the frequency of use and the severity the service life of the ...

Page 10: ...model is continuously operated the housing tail rubs the base of the operator s thumb and gives pain to the operator To cope with this problem the Models WH 12DM WR 12DM are equipped with the separate type motor without case to make the housing tail section slim More delicate speed control is required at the start of tightening screws The Models WH 12DM WR 12DM have a grip whose circumference at t...

Page 11: ...ave low height and wide bottom enough to stand the Models WH 12DM WR 12DM upright and are interchangeable with the conventional stand up batteries including EB 12B Thumb joint WH 12DM Short grip circumference at the switch section Soft and slip resistant grip Previous model Slim tail section 6 Low operating noise 3 dB with respect to the previous model Although the previous models give shrill nois...

Page 12: ...for retaining grease C powder sintered no groove is provided at the tip and a dust resistant seal is provided inside the metal the effect has already been proved by the Model WH 12DC2 Reference Motor comparison of the Model WH 12DM with C is shown below The Model WH 12DM is equipped with a powerful motor having 1 4 times thicker winding larger core diameter and stacking length than C In addition t...

Page 13: ...d tightening torque in reverse direction are lower than those in forward direction because the position of the motor brush is shifted to obtain high power with the small motor Selling points of the Model WH 12DM Class top tightening speed The Model WH 12DM is equipped with the new rare earth magnet motor that is more powerful than the previous model by 30 and the 35 larger hammer With the computer...

Page 14: ...1 Tightening torque comparison It should be noted that a M16 F10T bolt was tightened in 3 seconds with a hexagon socket 40 mm long in the test The tightening torque of the Model WR 12DM is substantially higher than the previous model The data above are intended for reference purposes only because actual tightening torque will vary depending on tightening conditions To describe the merit of high ti...

Page 15: ...umber of 105 mm square until the square washers at both sides are sunk into the lumber by 1 3 mm respectively The Model WR 12DM can tighten strap bolts and corner bracings used in Japanese wooden buildings speedily as it can sink washers into a workpiece quickly The data above are intended for reference purposes only because actual time required for sinking washers will vary depending on tightenin...

Page 16: ... J X N2 Therefore when the J X N2 of the Model WR 12DH is 100 the J X N2 of the Model WR 12DM is about 1 5 times larger than the Model WR 12DH as shown in the table below WR 12DM C WR 12DH Model Unit V Outside diameter of hammer D mm Height of hammer H mm Voltage kgmm2 WH 12DM 12 42 6 20 37 4 3140 WR 12DM 12 39 5 21 28 8 2900 C 12 42 16 5 31 7 3070 120 100 150 Hammer inertia J Number of strokes N ...

Page 17: ...l capacity 2 0 Ah 173 mm 6 13 16 x 226 mm 8 9 Battery Type EB 1230HL 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 3 0 Ah 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...

Page 18: ...ccessories 1 Optional accessories for the Model WH 12DM 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 9 1...

Page 19: ...4 22 7 8 24 15 16 W 5 16 W 3 8 W 7 16 W 1 2 M 12 15 32 944291 873632 873539 873540 873536 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...

Page 20: ...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 21: ...s Max tightening torque N m Measured figures 0 2 390 0 2 180 0 2 750 No load rotation speed min 0 2 800 0 2 900 0 2 660 Impact rate min 167 x 226 6 37 64 x 8 9 176 x 245 6 15 16 x 9 21 32 Overall length x height mm 168 x 231 6 39 64 x 9 3 32 26 1 1 64 26 1 1 64 26 1 1 64 Center height mm 1 66 3 7 lbs 1 73 3 8 lbs 1 58 3 5 lbs Main body weight kg 69 69 71 No load sound pressure level dB A Driver ch...

Page 22: ... No load sound pressure level dB A 1 3 1 Max tightening torque is based on tightening an M16 5 8 bolt F10T for 3 sec with a hexagon socket 2 Max tightening torque is based on tightening an M14 9 16 bolt strength grade 12 9 for 3 sec with a hexagon socket 3 Main body weight does not include accessory tools hexagon bit etc Variable speed switch with forward reverse changeover lever Type of switch Va...

Page 23: ...20 100 80 20 40 60 0 0 0 sec 140 160 1400 1215 in lbs 1600 1389 in lbs Tightening torque WH 12DM C forward 200 174 in lbs 0 1 2 3 400 347 in lbs 600 521 in lbs 800 694 in lbs 1000 868 in lbs kgf cm Tightening time WH 12DH 1200 1042 in lbs N m 120 100 80 20 40 60 0 0 0 sec 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 A...

Page 24: ... coefficient 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...

Page 25: ... 400 347 600 521 800 694 1000 868 kgf cm in lbs Tightening torque 0 0 20 40 60 80 100 N m 1200 1042 120 200 174 0 1 2 3 400 347 600 521 800 694 1000 868 kgf cm in lbs 3 8 x 1 3 6 M10 x 30 Tightening torque High strength bolt 0 0 20 40 60 80 100 N m Ordinary bolt Model WH 12DM 7 3 3 Bolt Tightening torque characteristics Figures 6 1 and 6 2 show relationships between time and tightening torque for ...

Page 26: ...mbient temperature characteristics of the battery etc 3 Wood screw 4 5 mm dia x 90 mm length hemlock spruce 4 Wood screw 4 5 mm dia x 90 mm length lauan 2 Wood screw 5 3 mm dia x 120 mm length lauan HITACHI WH 12DM HITACHI WH 12DH C 6 5 sec Model sec 9 5 sec 7 2 sec 1 2 3 4 5 6 7 8 9 10 Fast Slow HITACHI WH 12DM HITACHI WH 12DH C 2 4 sec Model sec 4 1 sec 3 2 sec 1 2 3 4 5 Fast Slow HITACHI WH 12D...

Page 27: ...d 575 545 635 Wood screw 4 2 mm dia x 90 mm hard wood 115 110 105 Wood screw 5 3 mm dia x 120 mm hard wood 45 40 40 Machine screw M8 x 16 mm 1 280 1 215 1 475 Note 1 The Model WH 12DM is equipped with the larger hammer and the higher power motor for the higher tightening speed Although the higher tightening speed is realized the Model WH 12DM has the following disadvantage High startup current The...

Page 28: ...the types of workpieces hardness etc Measuring conditions a Wood screws 4 5 mm in diameter and 90 mm in length and cedar workpieces b Battery voltage 12 V A range distance 1 m c Average of tightening 5 screws Actual noise Tightening time 2 4 1 5 1 7 WH 12DM WH 12DH C 98 88 90 92 94 96 86 dB 3 0 5 1 1 5 2 2 5 0 sec 90 4 93 6 91 3 2 Actual noise when tightening bolts Measuring conditions a M12 bolts...

Page 29: ...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 the charg...

Page 30: ... replacement is necessary 10 Disposal of the Type EB 1220BL or EB 1230HL Storage Battery Ensure that all customers understand that Type EB 1220BL or EB 1230HL Storage Batteries should be turned 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 indiscrim...

Page 31: ...torque wrench or torque 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...

Page 32: ...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 the b...

Page 33: ...orque 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 depletion of the grease and subsequent increased wear of componen...

Page 34: ...ve A 4 in order by following the procedure shown in Figs 8 1 to 8 4 Be sure not to lose the two Steel Balls D3 5 8 in Anvil C 9 Hold the body and adjust the gap of the retaining ring to the groove of anvil C then insert a small flat blade screwdriver into the groove at an angle Press down the Washer D with the small flat blade screwdriver Fig 8 2 Fig 8 1 1 2 Small flat blade screwdriver Anvil C 9 ...

Page 35: ...y from the J 297 base for washer S and support the end surface of the Spindle 17 14 With a hand press push down either of the raised faces of Hammer 11 8 to compress the Hammer Spring 14 11 In this position extract the two Steel Balls D5 556 10 7 from the cam grooves of the Spindle 17 14 and Hammer 11 8 with a small flat blade screwdriver or a similar tool Then slowly release the hand press and li...

Page 36: ...ove the two Machine Screws W SP Washer M3 x 5 35 32 that secure the flag terminal and then disconnect the internal wires purple and black of the Brush Block 28 25 from the DC Speed Control Switch 36 33 Note Do not disconnect the three FET internal wires soldered to the DC Speed Control Switch 9 Removal of the Magnet 26 23 and the Dust Guard Fin 27 24 Remove the Magnet 26 23 in the B direction see ...

Page 37: ...ntion should be given to the following items 1 Reassembly of the housing assembly a Be sure to follow the wiring diagram Fig 13 for proper wiring b When connecting the internal wires of the Brush Block 28 25 to the DC Speed Control Switch 36 33 fasten them with the Machine Screw W SP Washer M3 x 5 35 32 paying attention to the direction of the flag terminal Fig 13 Note If the flag terminal is moun...

Page 38: ...1 Fit the locking rib of the Ring Gear 20 17 to the concave portion of the Damper 23 20 Press fit the Armature Ass y 25 22 into the Inner Cover 24 21 Adjust the convex portion of the Dust Guard Fin 27 22 to the concave portion of the Brush Block 28 25 See Fig 14 Adjust the notch for locking of the Magnet 26 23 to the protrusion of housing A See Figs 14 and 15 Position the plate of the Dust Guard F...

Page 39: ...C Speed Control Switch 36 33 see Fig 16 2 Mount the Strap 41 38 to housing A and apply silicone rubber ThreeBond 1211 to housing A as shown in Fig 16 Mount housing B to housing A and secure them with seven Tapping Screws W Flange D4 x 20 Black 31 28 Wipe the silicone rubber coming out of the housing with a cloth 3 Mounting the mechanical parts a Put Washer S 15 12 onto the shaft of the Spindle 17 ...

Page 40: ...e gears engage improperly 5 Mounting the hammer case Put Anvil C 9 or Anvil L Ass y 6 on the Spindle 17 14 Cover it with the Hammer Case 7 3 and secure with the four Tapping Screws W SP Washer D4 x 25 Black 6 2 6 Mounting Guide Sleeve A 4 WH 12DM only Insert the two Steel Balls D3 5 8 into the hole of Anvil C 9 Mount the Guide Sleeve A 4 Guide Spring 3 and Washer D 2 in sequence Mount the Retainin...

Page 41: ...l Balls D3 5 8 Sliding section between Anvil C 9 and Guide Sleeve A 4 c MOLUB ALLOY 777 1 All around the Needle Roller 19 16 5 mm diameter hole of Idle Gear Set 2 pcs 18 15 10 Screw tightening torque Tapping Screw W SP Washer D4 x 25 Black 6 2 1 96 0 49 N m 20 5 kgf cm 17 4 4 3 in lbs Tapping Screw W Flange D4 x 20 Black 31 28 1 96 0 49 N m 20 5 kgf cm 17 4 4 3 in lbs Machine Screw W SP Washer M3 ...

Page 42: ...ixed Variable WH 12DM Work Flow Inner Cover Armature Ass y Magnet Brush Block DC Speed Control Switch Hammer Case Washer Anvil B Ring Gear Housing A B Set General Assembly WR 12DM Steel Ball Hammer Washer Hammer Spring Spindle Idle Gear Set Needle Roller Ball Bearing 6901VV ...

Page 43: ...OL PARTS LIST LIST NO CORDLESS IMPACT DRIVER Model WH 12DM 2001 10 5 E1 F862 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 35 36 37 38 39 40 41 42 43 35 34 44 501 502 45 ...

Page 44: ...WASHER E 1 22 690 1VV BALL BEARING 6901VVCMPS2L 1 23 319 909 DAMPER 2 24 319 908 INNER COVER 1 25 360 557 ARMATURE ASS Y W BALL BEARING DC 12V 1 26 319 919 MAGNET 1 27 319 907 DUST GUARD FIN 1 28 319 905 BRUSH BLOCK 1 29 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 2 30 319 918 BRUSH CAP 2 31 302 086 TAPPING SCREW W FLANGE D4X20 BLACK 7 32 NAME PLATE 1 33 320 381 HOUSING A B SET 1 34 316 186 SUPPORT B 1 3...

Page 45: ...B NO 2 50L 1 603 992 672 DRIVER BIT B NO 3 50L 1 604 996 177 NON MAGNETIC HEX SOCKET 8MM 65L 1 605 985 329 NON MAGNETIC HEX SOCKET 10MM 65L 1 606 996 178 NON MAGNETIC HEX SOCKET 12MM 65L 1 607 996 179 NON MAGNETIC HEX SOCKET 13MM 65L 1 608 996 180 NON MAGNETIC HEX SOCKET 14MM 65L 1 609 996 181 NON MAGNETIC HEX SOCKET 16MM 65L 1 610 996 182 NON MAGNETIC HEX SOCKET 17MM 65L 1 611 996 197 HEX SOCKET ...

Page 46: ... 4 ITEM NO CODE NO DESCRIPTION REMARKS NO USED 10 01 WH12DM Printed in Japan 011005N ...

Page 47: ...IC TOOL PARTS LIST LIST NO CORDLESS IMPACT WRENCH Model WR 12DM 2001 10 25 E1 F864 501 1 2 7 3 4 6 5 8 9 10 11 17 18 19 20 21 22 23 24 25 26 27 28 32 34 33 30 32 31 35 36 37 38 39 40 41 29 13 14 12 15 16 502 ...

Page 48: ... BEARING 6901VVCMPS2L 1 20 319 909 DAMPER 2 21 319 908 INNER COVER 1 22 360 557 ARMATURE ASS Y W BALL BEARING DC 12V 1 23 319 919 MAGNET 1 24 319 907 DUST GUARD FIN 1 25 320 376 BRUSH BLOCK 1 26 999 054 CARBON BRUSH 5X6X11 5 1 PAIR 2 27 319 918 BRUSH CAP 2 28 302 086 TAPPING SCREW W FLANGE D4X20 BLACK 7 29 NAME PLATE 1 30 320 381 HOUSING A B SET 1 31 CAUTION PLATE 1 FOR USA 32 994 532 MACHINE SCRE...

Page 49: ...LE 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 SOCKET ASS Y 11 3MMX95L 1 INCLUD 618 619 621 992 610 UNIVERSAL JOINT ASS Y 1 INCLUD 618 619 622 95...

Page 50: ...ET 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 ASS Y SQUARE 12 7MMX100L 1 ...

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