Hitachi WH 12DM2 Technical Data And Service Manual
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Hitachi WH 12DM2 Technical Data And Service Manual

Cordless impact driver, cordless impact wrench
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CORDLESS IMPACT DRIVER
CORDLESS IMPACT WRENCH
LIST Nos. WH 12DM2: F887
WR 12DM2: F886
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
WH 12DM2
WR 12DM2
WH 12DM2
Sep. 2003
MODELS
WH 12DM2
WR 12DM2
Hitachi
Power Tools
TECHNICAL DATA
SERVICE MANUAL
WR 12DM2
AND
W

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Summary of Contents for Hitachi WH 12DM2

  • Page 1 Hitachi Power Tools CORDLESS IMPACT DRIVER WH 12DM2 TECHNICAL DATA CORDLESS IMPACT WRENCH SERVICE MANUAL WR 12DM2 WH 12DM2 WR 12DM2 LIST Nos. WH 12DM2: F887 Sep. 2003 WR 12DM2: F886 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 REMARK: Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol(s) is(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: WH 12DM2 Competitor Symbol Utilized Model Name Company Name...

  • Page 3: Table Of Contents

    10-1. Precautions in Disassembly and Reassembly ................32 10-2. Precautions in Disassembly and Reassembly of Battery Charger ..........40 11. STANDARD REPAIR TIME (UNIT) SCHEDULES................. 41 For WH 12DM2 ............................41 For WR 12DM2 ............................42 Assembly Diagram for WH 12DM2 ......................43 Assembly Diagram for WR 12DM2 ......................47...

  • Page 4: Product Name

    Light equipped hook The new cordless impact driver Model WH 12DM2 ("Super Impact 12") is the standard model of the Super Impact series. This "Super Impact 12" is expected to expand our market share of the cordless impact products. The new cordless impact wrench Model WR 12DM2 ("Super Wrench 12") is also brought out.

  • Page 5: Selling Points

    5. SELLING POINTS (1) Cordless impact driver Model WH 12DM2 More powerful High durability Class-top tightening speed • Impact-absorbing damper (20% faster than the previous model, 25% faster than C, • Large fan 10% faster than P) • Improved dust resistance:...
  • Page 6 (1530 kgf cm, 1330 in-lbs.) • • Selling points common to the Compact body Model WH 12DM2 Overall length of the Model • New design WR 12DM2 with respect to: • Elastomer is new titanium silver color. WR 12DM: -11 mm •...

  • Page 7: Selling Point Descriptions

    The cooling efficiency is improved thanks to the powerful full-fledged large radial fan and the computer- analyzed air ducts. Thus the Models WH 12DM2/WR 12DM2 are protected from burnout due to long-time continuous use and decrease in speed due to temperature rise.
  • Page 8 (WH 12DM2: 155 mm, WR 12DM2: 162 mm). The entire length of the Model WH 12DM2 is shorter than the previous model by 12 mm and the Model WR 12DM2 is shorter than the previous model by 11 mm.
  • Page 9 1.75 (3) New cyber design The Models WH 12DM2/WR 12DM2 have vibrant and cyber looks thanks to the widely adopted soft urethane resin (elastomer) and the complicated 3-D curved surfaces, stirring up curiosity to touch them. The soft urethane resin colored new titanium silver also catches the eye in show windows or working sites. In addition, the model name is embossed on the nameplate to present a powerful and classy styling.
  • Page 10 It is resistant to being caught on bracing plates etc. It does not get hot even if operated continuously. The hammer case of the Models WH 12DM2/WR 12DM2 does not get hot because it is covered with the protector entirely.
  • Page 11 (5) Light equipped hook (Patent applied for) The light equipped hook has the following two functions: It can be used as a hook for suspending from a waist belt when required by the nature of the work. It can be used as an auxiliary light for such operations as tightening screws in a dark place. Using as a hook A hook is convenient if there is no place to put the impact driver temporarily.
  • Page 12 (grip circumference at the switch section with respect to C: -14 mm P: -13 mm). The grip of the Models WH 12DM2/WR 12DM2 is slip-resistant even if held by a sweaty hand and comfortably fits thanks to the soft material and the embossed treatment (holding force: 30% greater than the previous model).
  • Page 13 (8) Low operating noise (-1 dB with respect to the previous model) The operating noise of the Models WH 12DM2/WR 12DM2 is low and dull thanks to the large hammer and the optimized impact timing. Thus the large hammer tightens screws powerfully with lower operating noise than the Model WH 12DM.
  • Page 14 Class-top tightening speed The Model WH 12DM2 is equipped with the new rare-earth magnet motor that is more powerful by 15% than the previous model thanks to the 20% greater magnetic force. In addition, thanks to the large hammer and the optimized impact timing, the tightening speed and the torque are increased.
  • Page 15 Selling points of the Model WR 12DM2 Powerful tightening torque 165 N m {1685 kgf cm, 1460 in-lbs.} • • The Model WR 12DM2 is equipped with the new rare-earth magnet motor having 20% greater magnetic force. In addition, thanks to the large hammer and the optimized impact timing, the tightening torque is increased as follows.
  • Page 16 sec. WR 12DM2 WR 12DM (12 V) (12 V) (12 V) (12 V) (14.4 V) Fig. 2 *The data above are intended for reference purposes only because actual loosening torque will vary depending on tightening conditions. (3) Sinking time comparison (square washers) Figure 3 shows the time required for tightening an M12 bolt into a pine laminated lumber of 105 mm square until the square washers at both sides are sunk into the lumber by 1.3 mm respectively.
  • Page 17 The 10% higher power motor and the larger hammer are the main factors that increase the tightening torque of the Model WR 12DM2 substantially. Comparison of hammer and number of strokes is shown below. (4) Comparison of hammer and number of strokes Thanks to the larger hammer (higher hammer inertia J) than the previous model, the number of strokes (N) of the Model WR 12DM2 is increased.

  • Page 18: Specifications

    6. SPECIFICATIONS 6-1. Specifications Model Cordless Impact Driver Cordless Impact Wrench Item WH 12DM2 WR 12DM2 Small screw M4 --- M8 (5/32" --- 5/16")* Ordinary bolt M6 --- M16 (1/4" --- 5/8") Capacity Ordinary bolt M5 --- M12 (3/16" --- 15/32") High-strength bolt M6 --- M12 (1/4"...
  • Page 19 Charger (For UC 14YFA) Charger power source: single-phase AC, 50/60 Hz Voltage: Depending on the order specification Power input: 56 W Charging system: Constant current charge with feedback control Overcharge protection system: (1) Battery voltage detection ( V system) Battery temperature detection (dT/dt system) for Ni-MH battery (2) Battery surface temperature detection (thermistor)

  • Page 20: Optional Accessories

    6-2. Optional Accessories (1) Optional accessories for the Model WH 12DM2 • Plus driver bit Bit No. Code No. No. 2 992671 50 mm (2") No. 3 992672 • Hexagon socket Stamped figures Code No. Part name Stamped figures (mm)
  • Page 21 (2) Optional accessories for the Model WR 12DM2 • Each dimension and applicable bolt for each hexagon socket Shape B Shape C Shape D Nominal diameter of applicable bolts Square Dihedral Socket primary dimensions (mm) Code Part drive width Inch dimension name (High-...
  • Page 22 Square Nominal diameter of applicable bolts Dihedral Socket primary dimensions (mm) Code drive Part width Inch dimension name (High- H (mm) screw (Ordinary) (Small type) strength) 12 mm M 8 (5/16") 12 (15/32") 52 (2-3/64") 20 (25/32") 20 (25/32") W 5/16" 34(1-11/32") 955138 M 8 (5/16")

  • Page 23: Comparisons With Similar Products

    : In the case of tapping screws and wood screws, a minimum of M3 (1/8") is possible. : WH 12DM2: Max. tightening torque is based on tightening an M14 (9/16") bolt (strength grade: 12.9) for 3 seconds with a hexagon socket.

  • Page 24: Specification Comparisons (Cordless Impact Wrench)

    7-2. Specification Comparisons (Cordless Impact Wrench) Maker HITACHI Model WR 12DM WR 12DM2 Item M 6 --- M 16 M 6 --- M 16 M 6 --- M 16 M 8 --- M 14 Ordinary bolt (1/4" --- 5/8") (1/4" --- 5/8") (1/4"...

  • Page 25: Tightening Torque

    7-3. Tightening Torque 7-3-1. Tightening torque characteristic comparisons Thanks to the high-power rare-earth magnet motor and the larger hammer inertia, the Models WH 12DM2/ WR 12DM2 can provide greater tightening torque. (1) Impact driver WH 12DM2 1400 Test conditions Bolt: M14 x 50 mm, high-strength bolt...
  • Page 26 7-3-2. Screw diameter and appropriate tightening torque Generally speaking, the appropriate tightening torque for a screw can be determined by the strength grade of the screw and the material tightened. Tables 1 and 2, and Fig. 5 below list data relative to the strength grade of various screws and the appropriate tightening torque.
  • Page 27 Ordinary bolt; strength grade 4.8 High-strength bolt; strengh grade Yield point or durable force: 12.9 (45,500 psi) Tensile strength of the bolt: (56,900 psi) • Model WH 12DM2 • • • • M14 x 50 M12 x 45 1400 1400...

  • Page 28: Tightening Time

    Thanks to the new higher power rare-earth magnet motor having 20% greater magnetic force and the 35% larger hammer, the Model WH 12DM2 gives optimum impact at tightening screws with the computer analysis and the tightening speed is 30% higher than the previous model. Tightening time comparison is shown below. The data below are intended for reference purposes only because actual tightening time will vary depending on hardness of the workpiece, ambient temperature, characteristics of the battery, etc.

  • Page 29: Number Of Screws Or Bolts Driven

    1,475 (M8 x 16 mm) Note 1) The Model WH 12DM2 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 12DM2 has the following disadvantage.

  • Page 30: Precautions In Sales Promotion

    8. PRECAUTIONS IN SALES PROMOTION 8-1. Safety Instructions In the interest of promoting the safest and most efficient use of these tools by all our customers, it is very important that at the time of sale 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 and Name Plate attached to each tool.
  • Page 31 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 indiscriminately, leakage of the cadmium compound contained in the battery may cause environmental pollution.

  • Page 32: Tightening Torque Inspection Prior To Operation

    8-2. Tightening Torque Inspection Prior to Operation As described and shown in Para. 7-3-3, the output tightening torque of which the Models WH 12DM2 and WR 12DM2 are capable in excess of the rated tightening torque of certain bolts and screws. Accordingly, if the 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.

  • Page 33: Suggestions And Precautions For The Efficient Use Of The Charger

    (2) Effects of low ambient temperatures The tightening torque required may be reduced at low ambient temperatures or under the influence of grease and different torque coefficients (dependent on manufacturing and finishing processes, and specified by bolt manufacturers). (3) Different bolt diameter Differences in bolt diameter will cause variation of the required levels of tightening torque.

  • Page 34: Other Precautions

    9. OTHER PRECAUTIONS (1) Check for cracks or other damage on the socket Cracks or any other faults on the socket are very hazardous. In addition, cracks or other damage to accessories will cause loss of tightening torque efficiency. Advise the customer to inspect accessories often, and ensure there are no abnormalities.

  • Page 35: Repair Guide

    10-1. Precautions in Disassembly and Reassembly The [bold] and <bold> numbers correspond to the item numbers in the Parts List and the exploded assembly diagram. ( [ ]: WH 12DM2, < >: WR 12DM2 ) 10-1-1. Disassembly (1) Removal of Guide Sleeve (B) [4] (Model WH 12DM2 only) Remove the Retaining Ring [1], Washer (D) [2], Guide Spring (A) [3] and Guide Sleeve (B) [4] in order by following the procedure shown in Figs.
  • Page 36 (2) Removal of Front Cap (A) [5] <1> and Protector (A) [6] <2> Insert a small flat-blade screwdriver between Front Cap (A) [5] <1> and Protector (A) [6] <2> and remove them from the Hammer Case [8] <4>. (3) Removal of the Hammer Case [8] <4> and the hammer assembly Remove the four Tapping Screws (W/SP.
  • Page 37 (6) Removal of the Carbon Brushes 5 x 6 x 11.5 [31] <28> Remove the two Brush Caps [32] <29>. Catch the flanges of the Carbon Brushes 5 x 6 x 11.5 [31] <28> with a small flat-blade screwdriver and remove the Carbon Brushes 5 x 6 x 11.5 [31] <28> at both sides. (7) Removal of housing (B) Remove the seven Tapping Screws (W/Flange) D4 x 20 (Black) [33] <30>...
  • Page 38 Armature Ass'y Inner Cover (A) [25] <22> Magnet (D) [28] <25> DC 12V Damper [24] <21> Inner Cover (A) [25] <22> [26] <23> Armature Ass'y DC 12V [26] <23> (pinion) Armature Ass'y DC 12V [26] Ring Gear (C) <23> (pinion) [21] <18>...
  • Page 39 10-1-2. Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse. However, special attention should be given to the following items. (1) Reassembly of the housing assembly (a) Be sure to follow the wiring diagram (Fig. 6) for proper wiring. (b) When connecting the internal wires of the Brush Block [30] <27>...
  • Page 40 (d) Mount a unit of Inner Cover (A) [25] <22> (including the Armature Ass'y DC 12 V [26] <23>), Magnet (D) [28] <25> (including Dust Guard Fin (A) [29] <26> and Side Yoke [27] <24>) and Brush Block [30] <27> into housing (A) (See Fig.
  • Page 41 (e) Mount the DC-Speed Control Switch [38] <35> to housing (A) so that the protrusion of the forward/reverse lever at the top of the switch is inserted into the hole of Pushing Button (A) [39] <36>. Apply silicone grease (KS609, Shin-Etsu Chemical Co., Ltd.) to the contacting surfaces of the FET of the DC-Speed Control Switch [38] <35>...
  • Page 42 Put Anvil (F) [10] or Anvil (R) Ass'y <7> on Spindle (D) [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>. (6) Mounting Guide Sleeve (B) [4] (WH 12DM2 only) Insert the two Steel Balls D3.5 [9] into Push down.

  • Page 43: Precautions In Disassembly And Reassembly Of Battery Charger

    Pinion tooth flanks of the Armature Ass'y DC 12V [26] <23>, tooth flanks of Ring Gear (C) [21] <18>, tooth flanks of the Idle Gear Set [19] <16> • Metal oil groove of the Hammer Case [8] <4> (b) HITACHI MOTOR GREASE No. 29 (WH 12DM2 only) • Two Steel Balls D3.5 [9] •...

  • Page 44: Standard Repair Time (Unit) Schedules

    11. STANDARD REPAIR TIME (UNIT) SCHEDULES For WH 12DM2 Variable MODEL 60 min. Fixed Work Flow WH 12DM2 DC-Speed Control Switch Housing (A).(B) Set Hook Ass'y Inner Cover (A) Armature Ass'y Magnet (D) Brush Block General Assembly Guide Sleeve (B)

  • Page 45: For Wr 12Dm2

    For WR 12DM2 Variable MODEL 60 min. Fixed Work Flow WR 12DM2 DC-Speed Control Switch Housing (A).(B) Set Hook Ass'y Inner Cover (A) Armature Ass'y Magnet (D) Brush Block General Assembly Hammer Case Hammer (D) Anvil (R) Ass'y Steel Ball Ring Gear (C) Hammer Spring Spindle (D)

  • Page 46: Assembly Diagram For Wh 12Dm2

    Hitachi Power Tools LIST NO. F887 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT DRIVER 2003 • • Model WH 12DM2 (E1)
  • Page 47 PARTS WH 12DM2 ITEM CODE NO. DESCRIPTION REMARKS USED 315-984 RETAINING RING 315-983 WASHER (D) 321-657 GUIDE SPRING (A) 321-658 GUIDE SLEEVE (B) 322-249 FRONT CAP (A) (GREEN) 321-676 PROTECTOR (A) 321-937 PROTECTOR (A) 1 FOR USA, CAN 319-917 TAPPING SCREW (W/SP. WASHER) D4X25 (BLACK)

  • Page 48: Standard Accessories

    PARTS WH 12DM2 ITEM CODE NO. DESCRIPTION REMARKS USED 320-387 BATTERY EB 1220BL (W/ENGLISH N.P.) 320-386 BATTERY EB 1220BL (W/ENGLISH N.P.) FOR USA, CAN STANDARD ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (MODEL UC 14YFA) CHARGER (MODEL UC 14YF2)
  • Page 49 WH 12DM2 ITEM CODE NO. DESCRIPTION REMARKS USED --- 4 --- 8 -- 03 Printed in Japan (030820N)

  • Page 50: Assembly Diagram For Wr 12Dm2

    Hitachi Power Tools LIST NO. F886 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT WRENCH 2003 • • Model WR 12DM2 (E1)
  • Page 51 CARBON BRUSH 5X6X11.5 (1 PAIR) 319-918 BRUSH CAP 302-086 TAPPING SCREW (W/FLANGE) D4X20 (BLACK) NAME PLATE 322-174 HOUSING (A).(B) SET (GREEN) 322-242 HITACHI PLATE 994-532 MACHINE SCREW (W/SP. WASHER) M3X5 319-906 DC-SPEED CONTROL SWITCH 321-661 PUSHING BUTTON (A) 321-672 TAPPING SCREW D2X6 321-918 HOOK ASS’Y (W/LIGHT)
  • Page 52 BATTERY EB 12B (W/ENGLISH N.P.) 1 FOR USA, CAN CORNER ATTACHMENT ASS’Y 1 INCLUD. 603-619 955-300 HOUSING 955-301 METAL 955-302 SPINDLE HITACHI LABEL 955-303 BEARING RACE 955-304 NEEDLE THRUST BEARING (NTA-1413) 955-305 COVER 955-306 NEEDLE BEARING (NTN BK1012) 948-227 RETAINING RING FOR D47 HOLE...
  • Page 53 OPTIONAL ACCESSORIES WR 12DM2 ITEM CODE NO. DESCRIPTION REMARKS USED 873-626 HEX. SOCKET ASS’Y 21MMX36L 1 INCLUD. 618, 619 873-627 HEX. SOCKET ASS’Y 22MMX40L 1 INCLUD. 618, 619 955-138 HEX. SOCKET ASS’Y (LONG) 12MMX52L 1 INCLUD. 618, 619 955-139 HEX. SOCKET ASS’Y (LONG) 13MMX52L 1 INCLUD.

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