Hitachi WH 12DMR Technical Data And Service Manualice Manual
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Hitachi WH 12DMR Technical Data And Service Manualice Manual

Cordless impact driver/cordless impact wrench
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CORDLESS IMPACT DRIVER
CORDLESS IMPACT WRENCH
LIST Nos. WH 12DMR: G814
WR 12DMR: G821
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
WH 12DMR
WR 12DMR
WH 12DMR
Revised Jun. 2005
MODELS
WH 12DMR
WR 12DMR
Hitachi
Power Tools
TECHNICAL DATA
SERVICE MANUAL
WR 12DMR
AND
W

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Summary of Contents for Hitachi WH 12DMR

  • Page 1 Power Tools CORDLESS IMPACT DRIVER WH 12DMR TECHNICAL DATA CORDLESS IMPACT WRENCH SERVICE MANUAL WR 12DMR WH 12DMR WR 12DMR LIST Nos. WH 12DMR: G814 Revised Jun. 2005 WR 12DMR: G821 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 12DMR Competitor Symbol Utilized Company Name Model Name...

  • Page 3: Table Of Contents

    10-1. Precautions in Disassembly and Reassembly .................. 25 10-2. Precautions in Disassembly and Reassembly of Battery Charger ........... 33 11. STANDARD REPAIR TIME (UNIT) SCHEDULES................34 For Model WH 12DMR ..........................34 For Model WR 12DMR ..........................35 Assembly Diagram for WH 12DMR...

  • Page 4: Product Name

    Models WH 12DMR and WR 12DMR under the same concept as the current impact driver/wrench series. The new Models WH 12DMR and WR 12DMR can take on the low-price competitors.

  • Page 5: Selling Points

    5. SELLING POINTS (1) Cordless impact driver Model WH 12DMR Class-top short body 155 mm and lightweight 1.6 kg P: 165 mm, 1.7 kg Class-top tightening speed and tightening torque 130 N • P: 113 N • Common to the Model WH 12DM2...
  • Page 6 (2) Cordless impact wrench Model WR 12DMR Class-top short body 162 mm and lightweight 1.6 kg P: 168 mm, 1.7 kg Class-top tightening torque 160 N • P: 158 N • Common to the Model WH 12DM2 High durability, dust resistance and long service life Common to the Model WH 12DM2 Replaceable carbon brushes...

  • Page 7: Selling Point Descriptions

    Top-class tightening speed and torque 130 N . m (1320 kgf . cm, 1150 in-lbs.) Although the Model WH 12DMR is equipped with an anisotropic bonded magnet that is cheaper than that of the Model WH 12DM2, the performance is almost equivalent to the Model WH 12DM2 thanks to the large hammer and the optimized impact timing.
  • Page 8 Slow Fast Model (sec.) 5.0 sec. HITACHI WH 12DMR 4.7 sec. HITACHI WH 12DM2 5.2 sec. Fig. 1 Tightening time comparison * Tightening time may vary depending on hardness of the workpiece, ambient temperature, characteristics of the battery, etc. kgf cm Tightening torque comparison 1600 (1389 in-lbs.)
  • Page 9 (1) Tightening torque comparison Figure 3 shows the torque required for tightening an M16 F10T bolt in 3 seconds with a hexagon socket (40 mm long). The tightening torque of the Model WR 12DMR is substantially lower than the previous model (12 V) and equivalent to or more than P2.

  • Page 10: Specifications

    6. SPECIFICATIONS 6-1. Specifications Cordless Impact Driver Cordless Impact Wrench Model Item WH 12DMR WR 12DMR Capacity Small screw M4 --- M8 (5/32" --- 5/16")* Ordinary bolt M6 --- M16 (1/4" --- 5/8") Ordinary bolt M5 --- M12 (3/16" --- 15/32") High-strength bolt M6 --- M12 (1/4"...
  • Page 11 Charger Overcharge prevention circuit: (Model UC 18YG) A thermostat monitos the surface temperature of the battery and, on detecting the temperature rise which occurs on completion of charging, automatically turns off the NOTE: The Model UC 18YG unit to prevent the battery from overcharge. charger is exclusive to Iutput capacity: 70 W NiCad batteries.

  • Page 12: Optional Accessories

    6-2. Optional Accessories (1) Optional accessories for the Model WH 12DMR • 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 13 (2) Optional accessories for the Model WR 12DMR • Each dimension and applicable bolt for each hexagon socket Shape B Shape C Shape D Square Nominal diameter of applicable bolts Dihedral Socket primary dimensions (mm) Code Part drive width Inch dimension name (High-...
  • Page 14 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 15: Comparisons With Similar Products

    7. COMPARISONS WITH SIMILAR PRODUCTS 7-1. Specification Comparisons (Cordless Impact Driver) Maker HITACHI Item Model WH 12DMR WH 12DM2 M 4 --- M 8 M 4 --- M 8 Small screw (5/32" --- 5/16") (5/32" --- 5/16") M 5 --- M 12...

  • Page 16: Specification Comparisons (Cordless Impact Wrench)

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

  • Page 17: Tightening Torque

    Thickness 25 mm 1200 (1042 in-lbs.) Accessory tool: Hexagon socket (length: 40 mm, 1000 (868 in-lbs.) width across flat: 19 mm) 800 (694 in-lbs.) WH 12DMR 600 (521 in-lbs.) 400 (347 in-lbs.) 200 (174 in-lbs.) (2) Impact wrench kgf cm Test conditions WR 12DMR, P2 2000 (1763 in-lbs.)
  • Page 18 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 19 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 12DMR kgf cm kgf cm M14 x 50 M12 x 45 1400 1400 High-strength bolt (1215 in-lbs.)

  • Page 20: Tightening Time

    1 Wood screw 5.3 mm dia. x 120 mm length, lauan Fast Slow Model sec. HITACHI WH 12DMR 5.0 sec. HITACHI WH 12DM2 4.7 sec. 5.2 sec. 2 Wood screw 4.5 mm dia. x 90 mm length, hemlock spruce...

  • Page 21: Number Of Screws Or Bolts Driven

    Number of screws or bolts driven (Cordless impact driver) Model HITACHI HITACHI Tightening condition WH 12DMR WH 12DM2 EB 1220BL EB 1220BL DW9071 Battery (Nominal capacity: 2.0 Ah) (Nominal capacity: 2.0 Ah)

  • Page 22: 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 23 Ensure that all customers understand that Type EB 1220BL, EB 1226HL 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 24 • CAUTION For safe operation, see instruction manual. • Charge HITACHI rechargeable battery types EB 7, EB 9, EB 12, EB 14 and EB 18 series. Other types of batteries may burst causing personal injury and damage. • û û...

  • Page 25: 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 12DMR and WR 12DMR 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 26: 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 27: 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 28: 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 12DMR, < >: WR 12DMR ) 10-1-1. Disassembly (1) Removal of Guide Sleeve (D) [4] (Model WH 12DMR only) Remove the Retaining Ring [1], Washer (D) [2], Guide Spring (B) [3] and Guide Sleeve (D) [4] in order by following the procedure shown in Figs.
  • Page 29 (2) Removal of Front Cap (B) [5] <1> and Protector (C) [6] <2> Insert a small flat-blade screwdriver between Front Cap (B) [5] <1> and Protector (C) [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 30 (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 31 Armature Ass'y Inner Cover (A) [25] <22> Magnet (E) [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 32 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. 13) for proper wiring. (b) When connecting the internal wires of the Brush Block [30] <27>...
  • Page 33 (d) Mount a unit of Inner Cover (A) [25] <22> (including the Armature Ass'y DC 12 V [26] <23>), Magnet (E) [28] <25> (including Dust Guard Fin (B) [29] <26> and Side Yoke [27] <24>) and Brush Block [30] <27> into housing (A) (See Fig.
  • Page 34 (e) Mount the DC-Speed Control Switch [37] <34> 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) [38] <35>. Apply silicone grease (KS609, Shin-Etsu Chemical Co., Ltd.) to the contacting surfaces of the FET of the DC-Speed Control Switch [37] <34>...
  • Page 35 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 (D) [4] (WH 12DMR only) Insert the two Steel Balls D3.5 [9] into Push down.

  • Page 36: 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 12DMR only) • Two Steel Balls D3.5 [9] •...

  • Page 37: Standard Repair Time (Unit) Schedules

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

  • Page 38: For Model Wr 12Dmr

    For WR 12DMR Variable MODEL 60 min. Fixed Work Flow WR 12DMR Hook Ass'y DC-Speed Control Switch Housing (A).(B) Set Inner Cover (A) Armature Ass'y Magnet (E) Brush Block General Assembly Hammer Case Hammer (D) Anvil (R) Ass'y Steel Ball Ring Gear (C) Hammer Spring (D)
  • Page 39 Hitachi Power Tools LIST NO. G814 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT DRIVER 2005 • • Model WH 12DMR (E2)
  • Page 40 PARTS WH 12DMR ITEM CODE NO. DESCRIPTION REMARKS USED 315-984 RETAINING RING 315-983 WASHER (D) 322-716 GUIDE SPRING (B) 322-717 GUIDE SLEEVE (D) 322-727 FRONT CAP (B) 322-728 PROTECTOR (C) 319-917 TAPPING SCREW (W/SP. WASHER) D4X25 (BLACK) 321-674 HAMMER CASE 319-535 STEEL BALL D3.5 (10 PCS.)
  • Page 41 PARTS WH 12DMR ITEM CODE NO. REMARKS DESCRIPTION USED 323-226 BATTERY EB 1226HL (W/ENGLISH N.P.) 320-388 BATTERY EB 1230HL (W/ENGLISH N.P.) 6 -- 05 * ALTERNATIVE PARTS --- 3 -- -...

  • Page 42: Standard Accessories

    STANDARD ACCESSORIES WH 12DMR ITEM CODE NO. DESCRIPTION REMARKS USED 322-070 CASE CHARGER (MODEL UC 14YFA) CHARGER (MODEL UC 18YG) OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 992-671 + DRIVER BIT (B) NO. 2 50L 992-672 + DRIVER BIT (B) NO. 3 50L 996-177 NON-MAGNETIC HEX.
  • Page 43 Hitachi Power Tools LIST NO. G821 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT WRENCH 2005 • • Model WR 12DMR (E1)
  • Page 44 HOUSING (A). (B) SET 994-532 MACHINE SCREW (W/SP. WASHER) M3X5 319-906 DC-SPEED CONTROL SWITCH 321-661 PUSHING BUTTON (A) 324-280 HITACHI PLATE CAUTION PLATE (A) 1 FOR USA, CAN 321-918 HOOK ASS’Y (W/LIGHT) 1 INCLUD. 39, 40 321-672 TAPPING SCREW D2X6...
  • Page 45 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 46 OPTIONAL ACCESSORIES WR 12DMR 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.

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