Hitachi WH 9DMR Technical Data And Service Manual
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Hitachi WH 9DMR Technical Data And Service Manual

Cordless impact driver & cordless impact wrench
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CORDLESS IMPACT DRIVER
CORDLESS IMPACT WRENCH
WH 9DMR
LIST Nos. WH 9DMR: G819
WR 9DMR: G820
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
WH 9DMR
WR 9DMR
Mar. 2005
MODELS
WH 9DMR
WR 9DMR
Hitachi
Power Tools
TECHNICAL DATA
SERVICE MANUAL
WR 9DMR
AND
W

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Summary of Contents for Hitachi WH 9DMR

  • Page 1 Hitachi Power Tools CORDLESS IMPACT DRIVER WH 9DMR TECHNICAL DATA CORDLESS IMPACT WRENCH WR 9DMR SERVICE MANUAL WH 9DMR WR 9DMR LIST Nos. WH 9DMR: G819 Mar. 2005 WR 9DMR: G820 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 9DMR Competitor Symbol Utilized Company Name Model Name...

  • Page 3: Table Of Contents

    10-1. Precautions in Disassembly and Reassembly ................24 10-2. Precautions in Disassembly and Reassembly of Battery Charger ..........33 11. STANDARD REPAIR TIME (UNIT) SCHEDULES................. 34 Model WH 9DMR ............................. 34 Model WR 9DMR ............................. 35 Assembly Diagram for WH 9DMR...

  • Page 4: Product Name

    9.6-V, 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 9DMR and WR 9DMR under the same concept as the current impact driver/wrench series. The new Models WH 9DMR and WR 9DMR can take on the low-price competitors.

  • Page 5: Selling Points

    5. SELLING POINTS (1) Cordless impact driver Model WH 9DMR Class-top tightening speed and tightening torque 105 N . m P: 102 N . m Common to the Model WH 12DM2 High durability, dust resistance and long service life Common to the Model WH 12DM2...
  • Page 6 (2) Cordless impact wrench Model WR 9DMR Class-top short body 160 mm and lightweight 1.4 kg Class-top tightening torque 115 N•m Common to the Model WH 12DM2 High durability, dust resistance and long service life Common to the Model WH 12DM2 Replaceable carbon brushes Common to the Model WH 12DM2 Protector is standard.

  • Page 7: Selling Point Descriptions

    5-1. Selling Point Descriptions Refer to pages 4 though 10 of Technical Data Service Manual for the Models WH 9DMR/WR 9DMR for common selling points. Selling points of the Model WH 9DMR Top class tightening speed and tightening torque 105 N . m (1070 kgf . cm, 930 in-lbs.)
  • Page 8 (2) Compact The overall length of the Model WR 9DMR is equivalent to the current Model WR 9DM2. Cordless impact wrench: Model WR 9DMR Hitachi Hitachi Product Unit WR 9DMR WR 9DM2 Overall length 160 (6-19/64") 160 (6-19/64") Center height 26.5 (1-3/64")

  • Page 9: Specifications

    6. SPECIFICATIONS 6-1. Specifications Model Cordless impact driver Cordless impact wrench Item WH 9DMR WR 9DMR Small screw M4 --- M8 (5/32" --- 5/16") Ordinary bolt M6 --- M14 (1/4" --- 9/16") Capacity Ordinary bolt M5 --- M12 (3/16" --- 15/32") High-strength bolt M6 --- M10 (1/4"...
  • Page 10 Charger (Model UC 18YG) Overcharge prevention circuit: A thermostat monitors the surface temperature of the battery and, on detecting the NOTE: The Model UC 18YG temperature rise which occurs on completion of charging, automatically turns off the charger is exclusive to unit to prevent the battery from overcharge.

  • Page 11: Optional Accessories

    6-2. Optional Accessories (1) Optional accessories for the Model WH 9DMR • 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 12 (2) Optional accessories for the Model WR 9DMR • Primary dimensions and applicable bolts for accessory hexagon sockets: Shape C Shape D Shape B φ Square Nominal diameter of applicable bolts Dihedral Socket primary dimensions (mm) drive Code Part width dimension name Inch...
  • Page 13 • Bit adaptor (Code No. 996144): 6.35 (1/4") 9.5 (3/8") 40 (1-9/16") Overall length Part name Code No. 955229 Cross-recessed (Phillips) hd. driver bit No.2 955654 955230 Cross-recessed (Phillips) hd. driver bit No.3 955655 • Extension bar [Overall length 100 mm (3-15/16") ] ............Code No. 996143 •...

  • Page 14: Comparisons With Similar Products

    7. COMPARISONS WITH SIMILAR PRODUCTS 7-1. Specification Comparisons (Cordless Impact Driver) Maker HITACHI Model WH 9DMR WH 9DM2 Item M 4 --- M 8 M 4 --- M 8 Small screw (5/32" --- 5/16") (5/32" --- 5/16") M 5 --- M 12...

  • Page 15: Specification Comparisons (Cordless Impact Wrench)

    7-2. Specification Comparisons (Cordless Impact Wrench) Maker HITACHI Model WR 9DMR WR 9DM2 Item M 6 --- M 14 M 6 --- M 14 Ordinary bolt (1/4" --- 9/16") (1/4 --- 9/16") Capacity M 6 --- M 10 M 6 --- M 10 High-strength bolt (1/4"...

  • Page 16: Tightening Torque

    7-3. Tightening Torque 7-3-1. Tightening torque characteristic comparisons (1) Impact driver WH 9DMR WH 9DM2 1200 (1042 in-lbs.) 1000 (868 in-lbs.) Test conditions Bolt: M12 x 45 mm (15/32" x 1-3/4") (strength grade: 12.9) (694 in-lbs.) Steel plate: Mild steel M12 (15/32") Thickness = 25 mm (1")
  • Page 17 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 18 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 9DMR kgf . cm 15/32" x 1-3/4" N . m (in-lbs.) (M12 x 45) 1200 kgf . cm kgf .

  • Page 19: Tightening Speed

    1 Wood screw 4.0 mm dia., 50 mm length, lauan Fast Slow Model sec. HITACHI WH 9DMR 1.2 sec. HITACHI WH 9DM2 1.5 sec. 1.2 sec. 2 Wood screw 4.2 mm dia., 75 mm length, lauan...

  • Page 20: Number Of Screws Or Bolts Driven

    Please note that the data below are intended for general reference only as the number of screws which can be tightened per charge may vary depending on tightening conditions, screw sizes, ambient temperature, characteristics of battery, etc. (1) Screws (Cordless impact driver: Model WH 9DMR) Model HITACHI...

  • Page 21: 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 22 Ensure that all customers understand that Type EB 9B, EB 926H or EB 930H 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 23: Tightening Torque Inspection Prior To Operation

    8-2. Tightening Torque Inspection Prior to Operation As described and shown in Para. 6-3-3, the output tightening torque of which the Models WH 9DMR and WR 9DMR 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 24: Tightening Torque Variation

    8-3. Tightening Torque Variation The tightening torque of the cordless impact driver or wrench may vary slightly in accordance with the factors described below. Salespersons are requested to advise the customer to confirm that appropriate tightening torque is obtained by measuring the torque with an appropriate torque wrench or torque driver at the beginning of the tightening operations, and as necessary during the tightening operations.

  • Page 25: Suggestions And Precautions For The Efficient Use Of The Charger

    (5) Different tightening conditions The tightening torque may vary in accordance with bolt torque coefficient (dependent on manufacturing process, and specified by bolt manufacturers), bolt grade and bolt length, even though the dimensions of the bolts are the same. Tightening torque may also vary depending on the surface finishing state of tightening materials (steel, aluminum, etc.), and materials to be tightened.

  • Page 26: 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 27: 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 9DMR, < >: WR 9DMR ) 10-1-1. Disassembly (1) Removal of Guide Sleeve (D) [4] (Model WH 9DMR 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 28 (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 29 (6) Removal of the Carbon Brushes 5 x 6 x 11.5 (1 Pair) [31] <26> Remove the two Brush Caps [32] <27>. Catch the flanges of the Carbon Brushes 5 x 6 x 11.5 (1 Pair) [31] <26> with a small flat-blade screwdriver and remove the Carbon Brushes 5 x 6 x 11.5 (1 Pair) [31] <26> at both sides.
  • Page 30 Armature Ass'y (W/Ball Bearing) DC 9.6V [26] <21> Inner Cover (A) [25] <20> Magnet (E) [28] <23> Inner Cover (A) [25] <20> Damper [24] <19> Armature Ass'y (W/Ball Bearing) DC 9.6V [26] <21> Armature Ass'y (W/Ball Bearing) Ring Gear (C) DC 9.6V Side York [27] <22>...
  • Page 31 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] <25>...
  • Page 32 (d) Mount a unit of Inner Cover (A) [25] <20> (including the Armature Ass'y (W/Ball Bearing) DC 9.6V [26] <21>), Magnet (E) [28] <23> (including Dust Guard Fin (B) [29] <24> and Side Yoke [27] <22>) and Brush Block [30] <25> into housing (A) (see Fig. 17). Pay attention to the following items. Adjust the protrusions of Dust Guard Fin (B) [29] <24>...
  • Page 33 Align the protrusions of housing (A) to the concave portions (for locking) of Magnet (E) [28] <23> Housing (A) Fig. 16 (e) Mount the DC-Speed Control Switch [37] <32> 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] <33>. Apply silicone grease (KS609, Shin-Etsu Chemical Co., Ltd.) to the contacting surfaces of the FET of the DC-Speed Control Switch [37] <32>...
  • Page 34 Apply silicone rubber. Position the blade of Dust Guard Fin (B) [29] <24> under the rib of housing (A). Terminal support Fig. 17 (3) Mounting the mechanical parts (a) Mount Washer (S) [16] <11> onto Spindle (D) [18] <13> and mount the Hammer (F) [12] <7> containing the twenty-eight Steel Balls D3.175 [13] <8>, Washer (J) [14] <9>...
  • Page 35 Tapping Screws (W/Sp. Washer) D4 x 25 (Black) [7] <3>. (6) Mounting Guide Sleeve (D) [4] (Model WH 9DMR only) Insert the two Steel Balls D 3.5 [9] into the hole of Anvil (F) [10]. Mount Guide Sleeve (D) [4], Guide Spring (B) [3] and Washer (D) [2] in sequence.

  • Page 36: Precautions In Disassembly And Reassembly Of Battery Charger

    • Two Steel Balls D 5.556 [11] <6> • Metal oil groove of the Hammer Case [8] <4> (b) HITACHI MOTOR GREASE No. 29 (Model WH 9DM2 only) • Two Steel Balls D3.5 [9] • Sliding section between Anvil (F) [10] and Guide Sleeve (D) [4] (C) MOLUB ALLOY 777-1 •...

  • Page 37: Standard Repair Time (Unit) Schedules

    11. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow WH 9DMR 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 Hammer Case Hammer (F)

  • Page 38: Model Wr 9Dmr

    Variable MODEL 60 min. Fixed Work Flow WR 9DMR Hook Ass'y DC-Speed Control Switch Housing (A).(B) Set Inner Cover (A) Armature Magnet (E) Brush Block General Assembly Hammer Case Hammer (F) Anvil (U) Steel Ball Ring Gear (C) Hammer Spring (A) Spindle (D) Idle Gear Set Needle Roller...
  • Page 39 Hitachi Power Tools LIST NO. G819 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT DRIVER 2005 • • Model WH 9DMR (E1)
  • Page 40 PARTS WH 9DMR 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 9DMR ITEM CODE NO. REMARKS DESCRIPTION USED 310-451 BATTERY EB 9B (W/ENGLISH N.P.) 2 FOR USA, CAN 324-288 BATTERY EB 9B (W/ENGLISH N.P.) 2 FOR TPE 323-225 BATTERY EB 926H (W/ENGLISH N.P.) 318-368 BATTERY EB 930H (W/ENGLISH N.P.)

  • Page 42: Standard Accessories

    STANDARD ACCESSORIES WH 9DMR ITEM CODE NO. DESCRIPTION REMARKS USED * 501 322-070 CASE EXCEPT FOR THA * 502 CHARGER (MODEL UC 18YG) * 502 CHARGER (MODEL UC 14YFA) OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 992-671 + DRIVER BIT (B) NO. 2 50L 992-672 + DRIVER BIT (B) NO.
  • Page 43 Hitachi Power Tools LIST NO. G820 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT WRENCH 2005 • • Model WR 9DMR (E1)
  • Page 44 324-287 HOUSING (A). (B) SET 994-532 MACHINE SCREW (W/SP. WASHER) M3X5 319-906 DC-SPEED CONTROL SWITCH 321-661 PUSHING BUTTON (A) 324-285 HITACHI PLATE CAUTION PLATE (A) FOR USA, CAN 321-918 HOOK ASS’Y (W/LIGHT) INCLUD. 37, 38 321-672 TAPPING SCREW D2X6 320-288...
  • Page 45 STANDARD ACCESSORIES WR 9DMR ITEM CODE NO. DESCRIPTION REMARKS USED 322-070 CASE EXCEPT FOR THA CHARGER (MODEL UC 14YFA) CHARGER (MODEL UC 18YG) OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 996-125 HEX. SOCKET ASS’Y 8MMX33L INCLUD. 602, 603 996-124 SOCKET PIN (A) 873-095 O-RING (P-16)
  • Page 46 WR 9DMR ITEM CODE NO. DESCRIPTION REMARKS USED Printed in Japan --- 4 --- 4 -- 05 (050401N)

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Wr 9dmr

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