Hitachi WH 14DMR Technical Data And Service Manual
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Hitachi WH 14DMR Technical Data And Service Manual

Cordless impact driver/wrench
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CORDLESS IMPACT DRIVER
WH 14DMR, WH 18DMR
CORDLESS IMPACT WRENCH
WR 14DMR, WR 18DMR
LIST Nos. WH 14DMR: G829
WH 18DMR: G831
WR 14DMR: G830
WR 18DMR: G832
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
WH 14DMR
Jul. 2005
MODELS
WH 14DMR, WH 18DMR
WR 14DMR, WR 18DMR
Hitachi
Power Tools
TECHNICAL DATA
SERVICE MANUAL
WR 14DMR
AND
W

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  • Page 1 TECHNICAL DATA CORDLESS IMPACT WRENCH SERVICE MANUAL WR 14DMR, WR 18DMR WH 14DMR WR 14DMR LIST Nos. WH 14DMR: G829 Jul. 2005 WH 18DMR: G831 WR 14DMR: G830 WR 18DMR: G832 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 14DMR Competitor Symbol Utilized Company Name Model Name...

  • Page 3: Table Of Contents

    10-1. Precautions in Disassembly and Reassembly ................28 10-2. Precautions in Disassembly and Reassembly of Battery Charger ..........37 11. STANDARD REPAIR TIME (UNIT) SCHEDULES..............38 For Models WH 14DMR/WH 18DMR ....................38 For Models WR 14DMR/WR 18DMR ....................39 Assembly Diagram for WH 14DMR...

  • Page 4: Product Name

    12-V, 14.4-V and 18-V impact driver/wrench series. To address the severe situation, we have developed the new high-performance impact driver/wrench series Models WH 14DMR, WH 18DMR, WR 14DMR and WR 18DMR under the same concept as the current Model WH 12DM2. These new models can take on the low-price competitors.

  • Page 5: Selling Points

    5. SELLING POINTS (1) Cordless impact driver Models WH 14DMR/WH 18DMR Class-top tightening speed and tightening torque [WH 14DMR: 140 N m, WH 18DMR: 150 N • • P1: 130 N m, P2: 132 N • • Common to the Model WH 12DM2...
  • Page 6 (2) Cordless impact wrench Models WR 14DMR/WR 18DMR Class-top tightening torque [WR 14DMR: 200 N m, WR 18DMR: 220 N • • P3: 175 N m, P4: 186 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 Points Descriptions

    • • Both the Models WH 14DMR and WH 18DMR are equipped with a relatively inexpensive magnet and the entire length is significantly shorter than the previous models respectively. However, the performance is superior to the competitors thanks to the large hammer and the optimized impact timing. Comparison of measured data with the previous model and the competitors is shown below.
  • Page 8 Selling points of the Models WR 14DMR/WR 18DMR Powerful tightening torque WR 14DMR: 200 N . m (2040 kgf . cm, 1770 in-lbs.) WR 18DMR: 220 N . m (2245 kgf . cm, 1950 in-lbs.) Both the Models WR 14DMR and WR 18DMR are equipped with a relatively inexpensive magnet and the entire length is significantly shorter than the previous models respectively.

  • Page 9: Specifications

    6. SPECIFICATIONS 6-1. Specifications Models WH 14DMR/WR 14DMR Model Cordless impact driver Cordless impact wrench Item WH 14DMR WR 14DMR Small screw M4 --- M10 (5/32" --- 3/8")* Ordinary bolt M10 --- M16 (3/8" --- 5/8") Capacity Ordinary bolt M6 --- M14 (1/4" --- 9/16") High-strength bolt M8 --- M14 (5/16"...
  • Page 10 Charger Overcharge prevention circuit: (Model UC 18YG) A thermostat monitors the surface temperature of the battery and, on detecting the temperature rise which occurs on completion of charging, automatically turns off the unit to prevent the battery from overcharge. Input capacity: 70 W Indication method: Pilot lamp indicator of battery charging Function : On .......
  • Page 11 Models WH 18DMR/WR 18DMR Model Cordless impact driver Cordless impact wrench Item WH 18DMR WR 18DMR Small screw M4 --- M10 (5/32" --- 3/8")* Ordinary bolt M10 --- M16 (3/8" --- 5/8") Capacity Ordinary bolt M6 --- M14 (1/4" --- 9/16") High-strength bolt M8 --- M14 (5/16"...
  • Page 12 Indication method of battery charging function: Charger Overcharge prevention circuit: (Model UC 18YG) A thermostat monitors the surface temperature of the battery and, on detecting the temperature rise which occurs on completion of charging, automatically turns off the unit to prevent the battery from overcharge. Input capacity: 70 W Indication method: Pilot lamp indicator of battery charging Function : On .......

  • Page 13: Optional Accessories

    6-2. Optional Accessories (1) Optional accessories for the Models WH 14DMR/WH 18DMR • 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...
  • Page 14 (2) Optional accessories for the Models WR 14DMR/WR 18DMR • 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...
  • Page 15 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 16: Comparisons With Similar Products

    7. COMPARISONS WITH SIMILAR PRODUCTS 7-1. Specification Comparisons (Cordless Impact Driver) Maker HITACHI HITACHI Model WH 18DMR WH 14DMR WH 14DM Item M 4 --- M 10 M 4 --- M 10 M 4 --- M 10 Small screw (5/32" --- 3/8") (5/32"...

  • Page 17: Specification Comparisons (Cordless Impact Wrench)

    7-2. Specification Comparisons (Cordless Impact Wrench) Maker HITACHI HITACHI Model WR 18DMR WR 14DMR WR 14DM Item M 10 --- M 16 M 10 --- M 16 M 10 --- M 16 Ordinary bolt (3/8" --- 5/8") (3/8" --- 5/8") (3/8"...

  • Page 18: Tightening Torque

    7-3. Tightening Torque 7-3-1. Tightening torque characteristic comparisons (1) Impact driver (14.4 V) WH 14DMR WH 14DM kgf . cm N . m Test conditions 1800 (1562 in-lbs.) Bolt: M14 x 50 mm, high-strength bolt 1600 (1389 in-lbs.) Steel plate: SS34P Thickness 25 mm 1400 (1215 in-lbs.)
  • Page 19 (3) Impact wrench (14.4 V) WR 14DM kgf . cm N . m Test conditions 2500 (2170 in-lbs.) Bolt: M16 x 55 mm (5/8" x 2-5/32") (F10T) Steel plate: Mild steel Thickness 25 mm 2000 (1736 in-lbs.) Accessory tool: Hexagon socket ass'y WR 14DMR 1500 (1302 in-lbs.) 1000 (868 in-lbs.)
  • Page 20 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. 4 below list data relative to the strength grade of various screws and the appropriate tightening torque.
  • Page 21 High-strength bolt; strength grade Yield point or durable force: 12.9 (45,500 psi) Tensile strength of the bolt: (56,900 psi) • Model WH 14DMR kgf . cm kgf . cm kgf . cm N . m N . m M12 x 45 M14 x 50 (in-lbs.)
  • Page 22 • Model WH 18DMR kgf . cm N . m (in-lbs.) M14 x 50 1800 kgf . cm (1562) kgf . cm N . m M12 x 45 N . m (in-lbs.) M10 x 30 (in-lbs.) 1600 1600 1600 (1389) High-strength bolt (1389) High-strength bolt...

  • Page 23: Tightening Time

    7-4. Tightening Time The performance of the Models WH 14DMR, WH 18DMR, WR 14DMR and WR 18DMR is superior to the competitors thanks to the large hammer and the optimized impact timing. 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 24: Number Of Screws Or Bolts Driven

    Number of screws or bolts driven (Cordless impact driver) Model HITACHI HITACHI HITACHI Tightening condition WH 14DMR WH 14DM WH 18DMR EB 14B EB 14B DW9091 DW9096 (Nominal capacity:...

  • Page 25: 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 26 (9) Do not attempt to disassemble the storage battery or the charger. Special devices, such as a thermostat, are built into the storage battery and charger to permit rapid charging. Incorrect parts replacement and/or wiring will cause malfunctions which could result in fire or other hazards. Instruct the customer to bring these units to an authorized service center in the event repair or replacement is necessary.
  • Page 27 (4) The following caution is listed on the Name Plate attached to the Model UC 18YG Charger. For the U.S.A. CAUTION • For safe operation, see Instruction Manual. • Charge HITACHI rechargeable batteries Type EB 7, EB 9, EB 12, EB 14 and EB 18 series. Other types of batteries may burst causing personal injury and damage.

  • Page 28: 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 14DMR, WH 18DMR, WR 14DMR and WR 18DMR are capable in excess of the rated tightening torque of certain bolts and screws.

  • Page 29: 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 30: 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 31: 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 14DMR, WH 18DMR, < >: WR 14DMR, WR 18DMR ) 10-1-1. Disassembly...
  • Page 32 (2) Removal of Front Cap (C) [5] <1> and Protector (D) [6] <2> Insert a small flat-blade screwdriver between Front Cap (C) [5] <1> and Protector (D) [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 33 (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 34 Magnet (F) Ass'y Armature and Inner Cover (B) [25] <22> [28] <25> Pinion Set Damper (A) [24] <21> Inner Cover (B) [25] <22> [26] <23> Armature and Pinion Set [26] <23> (pinion) Armature and Ring Gear (C) Pinion Set [26] [21] <18>...
  • Page 35 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. 12) for proper wiring. (b) When connecting the internal wires of the Brush Block [30] <27>...
  • Page 36 (d) Mount a unit of Inner Cover (B) [25] <22> (including the Armature and Pinion Set [26] <23>), Magnet (F) Ass'y [28] <25> (including Dust Guard Fin (B) [29] <26> and Side Yoke (A) [27] <24>) and Brush Block [30] <27> into housing (A) (see Fig.
  • Page 37 Align the protrusion of housing (A) with the notch (for locking) of magnet (F) ass'y. Housing (A) Fig. 16 --- 34 ---...
  • Page 38 (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 (B) [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 39 Put the Anvil [10] or Anvil (A) Ass'y <7> on the Spindle [18] <15>. Cover it with the Hammer Case [8] <4> and secure with the four Tapping Screws (W/Sp. Washer) D4 x 30 (Black) [7] <3>. (6) Mounting Guide Sleeve (D) [4] (Models WH 14DMR/WH 18DMR only) Insert the two Steel Balls D3.5 [9] into the hole of the Push down.

  • Page 40: Precautions In Disassembly And Reassembly Of Battery Charger

    Pinion tooth flanks of the Armature and Pinion Set [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 (Models WH 14DMR/WH 18DMR only) • Two Steel Balls D3.5 [9] •...

  • Page 41: Standard Repair Time (Unit) Schedules

    11. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow WH 14DMR WH 18DMR Hook Ass'y DC-Speed Control Switch Housing (A).(B) Set Inner Cover (B) Armature and Pinion Set Magnet (F) Brush Block General Assembly Guide Sleeve (D)

  • Page 42: For Models Wr 14Dmr/Wr 18Dmr

    Variable MODEL 60 min. Fixed Work Flow WR 14DMR WR 18DMR DC-Speed Hook Ass'y Control Switch Housing (A).(B) Set Inner Cover (B) Armature and Pinion Set Magnet (F) Brush Block General Assembly Hammer Hammer (D) Case Ass'y Steel Ball Anvil (A) Ass'y Hammer Ring Gear (D) Spring (F)
  • Page 43 Hitachi Power Tools LIST NO. G829 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT DRIVER 2005 • • Model WH 14DMR (E1)
  • Page 44 PARTS WH 14DMR ITEM CODE NO. DESCRIPTION REMARKS USED 315-984 RETAINING RING 315-983 WASHER (D) 321-657 GUIDE SPRING (A) 322-717 GUIDE SLEEVE (D) 324-238 FRONT CAP (C) 324-239 PROTECTOR (D) 307-851 TAPPING SCREW (W/SP. WASHER) D4X30 (BLACK) 324-216 HAMMER CASE 319-535 STEEL BALL D3.5 (10 PCS.)
  • Page 45 STANDARD ACCESSORIES WH 14DMR ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (MODEL UC 14YFA) CHARGER (MODEL UC 18YG) 323-230 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 321-823 DRILL CHUCK AND ADAPTER SET INCLUD. 616, 618 309-922 GREASE FOR IMPACT DRIVER (500G) 992-671 + DRIVER BIT (B) NO.
  • Page 46 WH 14DMR ITEM CODE NO. DESCRIPTION REMARKS USED --- 4 --- Printed in Japan 7 -- 05 (050708N)
  • Page 47 Hitachi Power Tools LIST NO. G831 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT DRIVER 2005 • • Model WH 18DMR (E1)
  • Page 48 PARTS WH 18DMR ITEM CODE NO. DESCRIPTION REMARKS USED 315-984 RETAINING RING 315-983 WASHER (D) 321-657 GUIDE SPRING (A) 322-717 GUIDE SLEEVE (D) 324-238 FRONT CAP (C) 324-239 PROTECTOR (D) 307-851 TAPPING SCREW (W/SP. WASHER) D4X30 (BLACK) 324-216 HAMMER CASE 319-535 STEEL BALL D3.5 (10 PCS.) 324-236...

  • Page 49: Standard Accessories

    STANDARD ACCESSORIES WH 18DMR ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (MODEL UC 24YFA) CHARGER (MODEL UC 18YG) 323-230 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 321-823 DRILL CHUCK AND ADAPTER SET INCLUD. 616, 618 309-922 GREASE FOR IMPACT DRIVER (500G) 992-671 + DRIVER BIT (B) NO.
  • Page 50 WH 18DMR ITEM CODE NO. DESCRIPTION REMARKS USED --- 4 --- Printed in Japan 7 -- 05 (050708N)
  • Page 51 Hitachi Power Tools LIST NO. G830 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT WRENCH 2005 • • Model WR 14DMR (E1)
  • Page 52 PARTS WR 14DMR ITEM CODE NO. DESCRIPTION REMARKS USED 324-238 FRONT CAP (C) 324-239 PROTECTOR (D) 307-851 TAPPING SCREW (W/SP. WASHER) D4X30 (BLACK) 324-250 HAMMER CASE 324-257 PIN RETAINER (B) 324-256 PLUNGER (B) 324-255 ANVIL (A) ASS’Y 1 INCLUD. 5, 6 959-154 STEEL BALL D5.556 (10 PCS.) 324-218...
  • Page 53 STANDARD ACCESSORIES WR 14DMR ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (UC 14YFA) CHARGER (UC 18YG) 323-230 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED CORNER ATTACHMENT ASS’Y EW-14R INCLUD. 602-618 955-300 HOUSING 955-301 METAL 955-302 SPINDLE HITACHI LABEL 955-303 BEARING RACE 955-304...
  • Page 54 OPTIONAL ACCESSORIES WR 14DMR ITEM CODE NO. DESCRIPTION REMARKS USED 955-143 HEX. SOCKET ASS’Y (LONG) 21MMX52L INCLUD. 617, 618 955-144 HEX. SOCKET ASS’Y (LONG) 22MMX52L INCLUD. 617, 618 992-613 SOCKET ASS’Y FOR DUCT 13MMX95L INCLUD. 617, 618, 645 992-614 SOCKET FOR DUCT 13MMX52L 992-615 SOCKET ASS’Y FOR DUCT 14MMX95L INCLUD.
  • Page 55 Hitachi Power Tools LIST NO. G832 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT WRENCH 2005 • • Model WR 18DMR (E1)
  • Page 56 PARTS WR 18DMR ITEM CODE NO. DESCRIPTION REMARKS USED 324-238 FRONT CAP (C) 324-239 PROTECTOR (D) 307-851 TAPPING SCREW (W/SP. WASHER) D4X30 (BLACK) 324-250 HAMMER CASE 324-257 PIN RETAINER (B) 324-256 PLUNGER (B) 324-255 ANVIL (A) ASS’Y 1 INCLUD. 5, 6 959-154 STEEL BALL D5.556 (10 PCS.) 324-218...
  • Page 57 STANDARD ACCESSORIES WR 18DMR ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (MODEL UC 24YFA) CHARGER (MODEL UC 18YG) 323-230 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED CORNER ATTACHMENT ASS’Y EW-14R 1 INCLUD. 602-618 955-300 HOUSING 955-301 METAL 955-302 SPINDLE HITACHI LABEL 955-303...
  • Page 58 OPTIONAL ACCESSORIES WR 18DMR ITEM CODE NO. DESCRIPTION REMARKS USED 955-143 HEX. SOCKET ASS’Y (LONG) 21MMX52L INCLUD. 617, 618 955-144 HEX. SOCKET ASS’Y (LONG) 22MMX52L INCLUD. 617, 618 992-613 SOCKET ASS’Y FOR DUCT 13MMX95L INCLUD. 617, 618, 645 992-614 SOCKET FOR DUCT 13MMX52L 992-615 SOCKET ASS’Y FOR DUCT 14MMX95L INCLUD.

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