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

Cordless impact driver wh 12dm cordless impact wrench wr 12dm
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CORDLESS IMPACT DRIVER
CORDLESS IMPACT WRENCH
WH 12DM
LIST Nos. WH 12DM: F862
WR 12DM: F864
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
WH 12DM
WR 12DM
Oct. 2001
MODEL
WH 12DM
WR 12DM
POWER TOOLS
TECHNICAL DATA
SERVICE MANUAL
WR 12DM
AND
W

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Summary of Contents for Hitachi WR12DMB - 12.0 V 1/2" Impact Wrench 2 Battery

  • Page 1 MODEL WH 12DM WR 12DM POWER TOOLS CORDLESS IMPACT DRIVER WH 12DM TECHNICAL DATA CORDLESS IMPACT WRENCH WR 12DM SERVICE MANUAL WH 12DM WR 12DM LIST Nos. WH 12DM: F862 Oct. 2001 WR 12DM: F864 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 12DM Competitor Symbol Utilized Model Name Company Name 6916D MAKITA WR 12DM...

  • Page 3: Table Of Contents

    CONTENTS Page 1. PRODUCT NAME ...........................1 2. MARKETING OBJECTIVE ......................1 3. APPLICATIONS ..........................1 4. STANDARD EQUIPMENT ......................1 5. SELLING POINTS ..........................2 5-1. Selling Point Descriptions ......................4 6. SPECIFICATIONS ........................14 6-1. Specifications ..........................14 6-2. Optional Accessories ........................15 7. COMPARISONS WITH SIMILAR PRODUCTS ................18 7-1.

  • Page 4: Product Name

    1. PRODUCT NAME Hitachi Cordless Impact Driver, Model WH 12DM Hitachi Cordless Impact Wrench, Model WR 12DM 2. MARKETING OBJECTIVE Owing to the shift of demand from nails to screws and increased demand for long screws, there is a market need for a powerful, high-speed, compact and easy-to-handle impact driver that provides more efficient operation per charge.

  • Page 5: Selling Points

    1.4 times thicker winding (than C), powerful rare-earth magnet motor Ultra-compact body but class-top tightening speed (made in Hitachi Koki), large fan and (30% faster than the previous model, 10% faster than C) optimum air ducts. Maximum torque 100 N m, the same torque in forward/ •...
  • Page 6 (2) Cordless Impact Driver: WR 12DM 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 • WR 14DH (14.4-V product): 147 N m (1500 kgf cm, 1302 in-lbs.) •...

  • Page 7: Selling Point Descriptions

    5-1. Selling Point Descriptions Common selling points (Models WH 12DM and WR 12DM) (1) New, compact and cyber design The Models WH 12DM/WR 12DM 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 Models WH 12DM/WR 12DM are equipped with a separate-type motor in which the armature is separated from the magnet like a 100-V motor while the previous models are equipped with an integrated- type motor contained in a steel case.
  • Page 8 The motor is manufactured using the latest facilities in Yamagata Plant. Temperature Burnout C: Smoking HITACHI WH 12DM 2 batteries 3 batteries 1 battery As shown in the above graph, C produces smoke when operating on one battery. When tightening wood screws (5.3 mm diameter and 120 mm long) into a workpiece (hemlock spruce) continuously, it suddenly takes...
  • Page 9 2 Improved dust resistance The dust-resistant contact seal bearings are provided at the commutator side and the fan side. Thanks to the new bearings, hermeticity is enhanced because the seals of the bearings always contact the inner rings (C: non-contact bearings). The labyrinth construction is provided between the housing and the fan at the pinion side as shown in the figure below to ensure protection against dust because the pinion side must have high durability against heavy loads.
  • Page 10 (3) Convenient one-touch hook A hook is very convenient if there is no place to put the impact driver temporarily. Although various kinds of hooks are on the market, there is a user demand for a standard accessory hook. To cope with this demand, the Models WH 12DM/WR 12DM are equipped with the hook having the following features as a standard accessory.
  • Page 11 WH 12DM Short grip Thumb Previous model circumference at joint the switch section Soft and slip- resistant grip Slim tail section * M-DSI (Abbreviation of "Multi-layered Die Slide Injection") This is a molding process that allows the nylon resin and the elastomer resin to be molded continuously in the same die in a short cycle by sliding the die.
  • Page 12 C. In addition, the Model WH 12DM is equipped with the full-fledged fan having walls at both sides of a blade for powerful cooling while C's fan is simple with only the blades. HITACHI WH 12DM 114 g 87 g Outside diameter of core: 30.5 mm...
  • Page 13 Tightening time comparison (Wood screw: 5.3 mm dia. x 120 mm length, hemlock spruce) Fast Slow Model sec. 6.5 sec. HITACHI WH 12DM 9.5 sec. HITACHI WH 12DH 7.2 sec. * Tightening time may vary depending on hardness of the workpiece, ambient temperature, characteristics of the battery, etc.
  • Page 14 Selling points of the Model WR 12DM Powerful tightening torque 150 N m {1530 kgf cm, 1330 in-lbs.} • • The Model WR 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 analysis, the Model WR 12DM gives optimum impact at tightening bolts and the tightening torque is 27% higher than the previous Model WR 12DH, 25% higher than C, and equivalent to the 14.4 V-product Model WR 14DH.
  • Page 15 WR 12DM WR 12DH 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 16 (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 12DM is increased. As a guide, stroking force is proportional for J X N .

  • Page 17: Specifications

    6. SPECIFICATIONS 6-1. Specifications Model Cordless Impact Driver Cordless Impact Wrench Item WH 12DM WR 12DM 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 18: Optional Accessories

    Pilot lamp indications (Model UC 14YF2) 0.5 sec ON, 0.5 sec OFF Prior to charging Blinks Stays ON constantly During charging Red pilot lamp remains lit or flashes. 0.5 sec ON, 0.5 sec OFF Charging completed Blinks Charging not 0.1 sec ON, 0.1 sec OFF Storage battery or charger Flickers possible...
  • Page 19 • Drill chuck adaptor set (Code No. 996195) The drill chuck adaptor set permits mounting of various types of locally-available drill bits for a variety of drilling operations. (2) Optional accessories for the Model WR 12DM • Each dimension and applicable bolt for each hexagon socket Shape B Shape C Shape D...
  • Page 20 Square Nominal diameter of applicable bolts Dihedral Socket primary dimensions (mm) drive Code Part width dimension Inch 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 21: Comparisons With Similar Products

    7. COMPARISONS WITH SIMILAR PRODUCTS 7-1. Specification Comparisons (Cordless Impact Driver) Maker HITACHI Model WH 12DM WH 12DH Item M 4 --- M 8 M 4 --- M 8 M 4 --- M 8 Small screw (5/32" --- 5/16")* (5/32" --- 5/16") (5/32"...

  • Page 22: Specification Comparisons (Cordless Impact Wrench)

    7-2. Specification Comparisons (Cordless Impact Wrench) Maker HITACHI Model WR 12DM WR 12DH Item M 6 --- M 14 M 6 --- M 16 M 8 --- M 14 Ordinary bolt (1/4" --- 5/8") (1/4" --- 9/16") (5/16" --- 9/16")

  • Page 23: 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 12DM/ WR 12DM can provide greater tightening torque. (1) Impact driver Test conditions WH 12DM Bolt: M12 x 45 mm (15/32" x 1-25/32") •...
  • Page 24 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 25 7-3-3. Bolt Tightening torque characteristics Figures. 6-1 and 6-2 show relationships between time and tightening torque for individual bolt types and sizes. While the data are useful for handy reference, actual tightening torque will vary depending on tightening conditions and other variables. For details, please refer to Para. 8-3, "Tightening Torque Variation". (Note) •...

  • Page 26: Tightening Speed

    1 Wood screw 5.3 mm dia. x 120 mm length, hemlock spruce Fast Slow Model sec. 6.5 sec. HITACHI WH 12DM 9.5 sec. HITACHI WH 12DH 7.2 sec. 2 Wood screw 5.3 mm dia. x 120 mm length, lauan Fast...

  • Page 27: Number Of Screws Or Bolts Driven

    (1) Number of screws or bolts driven (Cordless impact driver) Model HITACHI HITACHI Tightening condition WH 12DM...

  • Page 28: Actual Noise When Tightening Wood Screws And Bolts

    7.6 Actual Noise When Tightening Wood Screws and Bolts (1) Actual noise when tightening wood screws The comparison data when tightening a wood screw (4.5 mm in diameter and 90 mm in length) into a cedar workpiece are shown below. The data below are intended for reference purposes only because actual noise will vary depending on the types of workpieces, hardness, etc.

  • Page 29: 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 30 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 31: 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 12DM and WR 12DM 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 32: 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 33: 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 34: Repair Guide

    10. REPAIR GUIDE WARNING: Without fail, remove the Model EB 1220BL or EB 1230HL Battery from the main body before starting repair or maintenance work. Because the tool is cordless, if the battery is left in and the switch is activated inadvertently, the motor will start rotating unexpectedly, which could cause serious injury.
  • Page 35 (2) Removal of the Hammer Case [7] <3> and the hammer assembly Remove the four Tapping Screws (W/SP. Washer) D4 x 25 (Black) [6] <2> that connect the Hammer Case [7] <3> with Housing (A). (B) Set [33] <30> and remove the Hammer Case [7] <3> and the hammer assembly from Housing (A).(B) Set [33] <30>.
  • Page 36 (5) Removal of the Hook Ass'y [39] <36> Remove the Special Screw M5 [43] <40> with a flat-blade screwdriver or a coin and remove the Hook Ass'y [39] <36> and the Hook Spring [42] <39>. (6) Removal of Housing (B) Remove the seven Tapping Screws (W/Flange) D4 x 20 (Black) [31] <28>...
  • Page 37 (10) Removal of the Armature Ass'y [25] <22> [20] <17> Support the Inner Cover [24] <21> so that it does not contact the [21] <18> fan of the Armature Ass'y [25] <22>. With a hand press, push [22] <19> down the tip portion of Armature Ass'y (pinion) [25] <22> to remove it.
  • Page 38 (c) Mount a unit of the Inner Cover [24] <21> (including the Armature Ass'y [25] <22>), Magnet [26] <23> (including the Dust Guard Fin [27] <24>) and Brush Block [28] <25> into housing (A) (See Fig. 15). Pay attention to the following items. Adjust the protrusion of the Dust Guard Fin [27] <24>...
  • Page 39 (d) Mount the DC-Speed Control Switch [36] <33> to housing (A) so that the protrusion of the forward/reverse lever at the top of the switch is inserted into the U-shaped groove of the Pushing Button [37] <34>. Apply silicone grease (KS609, Shin-Etsu Chemical Co., Ltd.) to the contacting surfaces of the FET of the DC- Speed Control Switch [36] <33>...
  • Page 40 (c) Insert the two Steel Balls D5.556 [10] <7> into the steel ball guide groove. Check that the steel balls are properly inserted in the cam groove. Then release the hand press. (d) Mount the hammer assembly onto the J297 base for washer (S). With a hand press, push down the top of the Spindle [17] <14>...

  • Page 41: Precautions In Disassembly And Reassembly Of Battery Charger

    • Metal oil groove of the Hammer Case [7] <3> • Twenty-eight Steel Balls D3.175 [12] <9> (b) HITACHI MOTOR GREASE No. 29 (WH 12DM only) • Two Steel Balls D3.5 [8] • Sliding section between Anvil (C) [9] and Guide Sleeve (A) [4] (c) MOLUB-ALLOY 777-1 •...

  • Page 42: Standard Repair Time (Unit) Schedules

    11. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow WH 12DM WR 12DM DC-Speed Control Switch Housing (A).(B) Set Inner Cover Armature Ass'y Magnet Brush Block General Assembly Hammer Case Steel Ball Washer Hammer Anvil (B) Washer Ring Gear Hammer Spring...
  • Page 43 LIST NO. F862 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT DRIVER 2001 • • Model WH 12DM (E1)
  • Page 44 NAME PLATE 320-381 HOUSING (A).(B) SET 316-186 SUPPORT (B) 994-532 MACHINE SCREW (W/SP. WASHER) M3X5 319-906 DC-SPEED CONTROL SWITCH 316-166 PUSHING BUTTON HITACHI LABEL 320-287 HOOK ASS’Y INCLUD.40 320-288 V-LOCK NUT M5 306-952 STRAP (BLACK) 319-926 HOOK SPRING 319-927 SPECIAL SCREW M5 320-387 BATTERY EB 1220BL (W/ENGLISH N.P.)

  • Page 45: Standard Accessories

    STANDARD ACCESSORIES WH12DM ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (MODEL UC 14YF2) 320-377 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED * 601 310-378 BATTERY EB 12B (W/ENGLISH N.P.) * 601 310-453 BATTERY EB 12B (W/ENGLISH N.P.) 1 FOR USA,CAN * 601 316-665 BATTERY EB 12H (W/ENGLISH N.P.)
  • Page 46 WH12DM ITEM CODE NO. DESCRIPTION REMARKS USED --- 4 --- 10 -- 01 Printed in Japan (011005N)
  • Page 47 LIST NO. F864 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT WRENCH 2001 • • Model WR 12DM (E1)
  • Page 48 320-381 HOUSING (A).(B) SET CAUTION PLATE 1 FOR USA 994-532 MACHINE SCREW (W/SP. WASHER) M3X5 319-906 DC-SPEED CONTROL SWITCH 316-166 PUSHING BUTTON HITACHI LABEL 320-378 HOOK ASS’Y 1 INCLUD.37 320-288 V-LOCK NUT M5 306-952 STRAP (BLACK) 319-926 HOOK SPRING 319-927...
  • Page 49 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 50 WR 12DM OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 873-626 HEX. SOCKET ASS’Y 21MMX36L INCLUD.618,619 873-627 HEX. SOCKET ASS’Y 22MMX40L INCLUD.618,619 955-138 HEX. SOCKET ASS’Y (LONG) 12MMX52L INCLUD.618,619 955-139 HEX. SOCKET ASS’Y (LONG) 13MMX52L INCLUD.618,619 955-140 HEX. SOCKET ASS’Y (LONG) 14MMX52L INCLUD.618,619 955-141 HEX.

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