Hitachi WH 9DM2 Technical Data And Service Manual
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Hitachi WH 9DM2 Technical Data And Service Manual

Cordless impact driver and wrench
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Download this manual See also: Operation Manual & Safety Instructions
CORDLESS IMPACT DRIVER
CORDLESS IMPACT WRENCH
LIST Nos. WH 9DM2: G801
WR 9DM2: G802
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
WH 9DM2
WR 9DM2
WH 9DM2
Mar. 2004
MODELS
WH 9DM2
WR 9DM2
Hitachi
Power Tools
TECHNICAL DATA
SERVICE MANUAL
WR 9DM2
AND
G

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Summary of Contents for Hitachi WH 9DM2

  • Page 1 Hitachi Power Tools CORDLESS IMPACT DRIVER WH 9DM2 TECHNICAL DATA CORDLESS IMPACT WRENCH WR 9DM2 SERVICE MANUAL WH 9DM2 WR 9DM2 LIST Nos. WH 9DM2: G801 Mar. 2004 WR 9DM2: G802 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 9DM2 Competitor Symbol Utilized Model Name Company Name...

  • Page 3: Table Of Contents

    9. REPAIR GUIDE ..........................24 9-1. Precautions in Disassembly and Reassembly ................24 9-2. Precautions in Disassembly and Reassembly of Battery Charger ..........33 10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..............34 Assembly Diagram for WH 9DM2 Assembly Diagram for WR 9DM2...

  • Page 4: Product Name

    This is to realize a lightweight and compact driver (overall length 20 mm, product weight • 200 g). The Model WH 9DM2 is very convenient for tightening small screws such as sash screws requiring less tightening torque. The new Model WR 9DM2 provides the class-top tightening torque 120 N m that is 40% higher than the current •...

  • Page 5: Selling Points

    4. SELLING POINTS (1) Cordless impact driver Model WH 9DM2 The shortest overall length in the class 147 mm Convenient for work in narrow places Selling points common to the Model WH 12DM2 New design Elastomer is new titanium silver color.
  • Page 6 (2) Cordless impact wrench Model WR 9DM2 Class-top tightening torque 120 N m {1220 kgf • • C: 100 N • Selling points common to the Model WR 12DM2 New design Elastomer is new titanium silver color. Protector is standard. Convenient light equipped hook High durability, dust resistance and Compact...

  • Page 7: Selling Point Descriptions

    Equipped with a new rare-earth magnet motor having 1.2 times greater magnetic force (Same as the Model WH 12DM2) The Model WH 9DM2 is equipped with a new rare-earth magnet motor that is smaller than the Model WH 9DM by 30% while providing higher power.
  • Page 8 Table 1 shows a comparison of number of trigger switch operations when tightening a tapping screw D4 x 25 in a workpiece of nylon resin (prepared hole diameter 3.5 mm) until each driver idles. The Model WH 9DM2 has the highest resistance to idling because the number of adjustments is most frequent. (The switch is turned off immediately after striking is started.
  • Page 9 The overall length of the Model WR 9DM2 is 7 mm shorter than the current Model WR 9DM and 8 mm shorter than C. It is convenient for work in narrow places. Cordless impact wrench: Model WR 9DM2 Hitachi Hitachi Product...

  • Page 10: Specifications

    5. SPECIFICATIONS 5-1. Specifications Model Cordless impact driver Cordless impact wrench Item WH 9DM2 WR 9DM2 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 11 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 12: Optional Accessories

    5-2. Optional Accessories (1) Optional accessories for the Model WH 9DM2 • 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 9DM2 • Primary dimensions and applicable bolts for accessory hexagon sockets: Shape C Shape B Shape D φ Square Nominal diameter of applicable bolts Dihedral Socket primary dimensions (mm) Code Part drive width dimension name Inch...
  • Page 14 • Bit adaptor (Code No. 996144): 6.35 (1/4") 9.5 (3/8") 40 (1-9/16") Part name Overall length 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 15: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons (Cordless Impact Driver) Maker HITACHI Model WH 9DM2 WH 9DM 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 16: Specification Comparisons (Cordless Impact Wrench)

    6-2. Specification Comparisons (Cordless Impact Wrench) Maker HITACHI Model WR 9DM2 WR 9DM Item M 6 --- M 14 M 6 --- M 14 M 8 --- M 14 Ordinary bolt (1/4" --- 9/16") (1/4" --- 9/16") (5/16" --- 9/16")

  • Page 17: Tightening Torque

    (1) Impact driver Thanks to the high-power rare-earth magnet motor and the computer analysis, the Model WH 9DM gives optimum impact at tightening screws and the tightening torque is increased. WH 9DM WH 9DM2 1200 (1042 in-lbs.) Test conditions 1000 (868 in-lbs.)
  • Page 18 6-3-2. 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. 2 below list data relative to the strength grade of various screws and the appropriate tightening torque.
  • Page 19 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 9DM2 kgf . cm 15/32" x 1-3/4" (in-lbs.) N . m (M12 x 45) 1200 kgf . cm kgf .

  • Page 20: Tightening Speed

    1 Wood screw 4.0 mm dia., 50 mm length, lauan Fast Slow Model sec. 1.5 sec. HITACHI WH 9DM2 1.3 sec. HITACHI WH 9DM 2.0 sec. 2 Wood screw 4.2 mm dia., 75 mm length, lauan Fast Slow Model sec.

  • Page 21: 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 9DM2) Model HITACHI...

  • Page 22: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION 7-1. 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 9B 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 24: Tightening Torque Inspection Prior To Operation

    7-2. Tightening Torque Inspection Prior to Operation As described and shown in Para. 6-3-3, the output tightening torque of which the Models WH 9DM2 and WR 9DM2 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 25: 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 26: Other Precautions

    8. 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

    9-1. 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 9DM2, < >: WR 9DM2 ) 9-1-1. Disassembly (1) Removal of Guide Sleeve (C) [4] (Model WH 9DM2 only) Remove the Retaining Ring [1], Washer (F) [2], Guide Spring (C) [3] and Guide Sleeve (C) [4] in order by following the procedure shown in Figs.
  • Page 28 (2) Removal of Front Cap (A) [5] <1> and Protector (B) [6] (A) <2> Insert a small flat-blade screwdriver between Front Cap (A) [5] <1> and Protector (B) [6] (A) <2> and remove them from the Hammer Case [8] <4>. (3) Removal of the Hammer Case [8] <4>...
  • Page 29 FET to avoid malfunction of the switch. Then, Inner Cover (A) [23] <20>, Armature Ass'y [24] <21>, Magnet (D) [26] <23>, Magnet Spacer [27] (Model WH 9DM2 only), Brush Block [29] <25> and DC-Speed Control Switch [37] <33> can be removed in a piece. Pushing Button (A) [38] <34> can also be removed.
  • Page 30 Magnet (D) [26] <23> Magnet Spacer [27] Armature Inner Cover (A) [23] <20> Ass'y Damper <19> Inner Cover (A) [23] <20> [24] <21> Armature Ass'y [24] <21> (Pinion) Armature Ass'y Ring Gear Side York [25] <22> Brush Block [24] <21> (Pinion) [20] <16>...
  • Page 31 9-1-2. 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 [29] <25>...
  • Page 32 (d) Mount a unit of Inner Cover (A) [23] <20> (including the Armature Ass'y [24] <21>), Magnet (D) [26] <23> (including Dust Guard Fin (A) [28] <24>, Magnet Spacer [27] (Model WH 9DM2 only) and Side Yoke [25] <22>) and Brush Block [29] <25> into housing (A) (see Fig. 11). Pay attention to the following items.
  • Page 33 Align the protrusions of housing (A) to the concave portions (for locking) of Magnet (D) [26] <23> and the Magnet Spacer [27] (Model WH 9DM2 only). Housing (A) Fig. 10 (e) Mount the DC-Speed Control Switch [37] <33> 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] <34>.
  • Page 34 Apply silicone rubber. Position the blade of Dust Guard Fin (A) [28] <24> under the rib of housing (A). Fig. 11 (3) Mounting the mechanical parts (a) Mount Washer (S) [15] <11> onto the Spindle [17] <13> and mount the Hammer [12] <7> containing the twenty-eight Steel Balls D3.175 [9] <8>, Washer (J) [13] <9>...
  • Page 35 [17] <13>. Cover it with the Hammer Case [8] <4> and secure them with the four Tapping Screws (W/Sp. Washer) D4 x 25 (Black) [7] <3>. Push down. (6) Mounting Guide Sleeve (C) [4] (Model WH 9DM2 only) Retaining Ring [1] J-339 jig (F) for retaining ring Insert the two Steel Balls D 3.175 [9] into the hole...

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

    Pinion tooth flanks of the Armature Ass'y [24] <21>, tooth flanks of the Ring Gear [20] <16>, teeth of the Idle Gear Set (2 pcs.) [18] <14> • Twenty-eight Steel Balls D3.175 [9] <8> (b) HITACHI MOTOR GREASE No. 29 (Model WH 9DM2 only) • Two Steel Balls D3.175 [9] •...

  • Page 37: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow WH 9DM2 Hook Ass'y DC-Speed Control Switch Housing (A).(B) Set Inner Cover (A) Armature Magnet (D) Brush Block General Assembly Guide Sleeve Hammer Case Hammer (E) Anvil (T)
  • Page 38 Variable MODEL 60 min. Fixed Work Flow WR 9DM2 Hook Ass'y DC-Speed Control Switch Housing (A).(B) Set Inner Cover (A) Armature Magnet (D) 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. G801 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT DRIVER 2004 • • Model WH 9DM2 (E1)
  • Page 40 PARTS WH 9DM2 ITEM CODE NO. DESCRIPTION REMARKS USED 995-933 RETAINING RING 322-739 WASHER (F) 322-737 GUIDE SPRING (C) 322-738 GUIDE SLEEVE (C) 322-249 FRONT CAP (A) (GREEN) 322-749 PROTECTOR (B) 319-917 TAPPING SCREW (W/SP. WASHER) D4X25 (BLACK) 322-748 HAMMER CASE 959-148 STEEL BALL D3.175 (10 PCS.)

  • Page 41: Standard Accessories

    STANDARD ACCESSORIES WH 9DM2 ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (MODEL UC 14YFA) 322-886 CASE 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. SOCKET 8MM 65L 985-329 NON-MAGNETIC HEX.
  • Page 42 WH 9DM2 ITEM CODE NO. DESCRIPTION REMARKS USED Printed in Japan -- - 4 -- - 3 -- 04 (040325N)
  • Page 43 Hitachi Power Tools LIST NO. G802 ELECTRIC TOOL PARTS LIST CORDLESS IMPACT WRENCH 2004 • • Model WR 9DM2 (E1)
  • Page 44 CARBON BRUSH 5X6X11.5 (1 PAIR) 319-918 BRUSH CAP 302-086 TAPPING SCREW (W/FLANGE) D4X20 (BLACK) NAME PLATE 322-751 HOUSING (A).(B) SET 322-753 HITACHI LABEL 994-532 MACHINE SCREW (W/SP. WASHER) M3X5 319-906 DC-SPEED CONTROL SWITCH 321-661 PUSHING BUTTON (A) CAUTION PLATE (A) 321-672...
  • Page 45 STANDARD ACCESSORIES WR 9DM2 ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (MODEL UC 14YFA) 322-886 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 996-125 HEX. SOCKET ASS’Y 8MMX33L 1 INCLUD. 602, 603 996-124 SOCKET PIN (A) 873-095 O-RING (P-16) 996-126 HEX.
  • Page 46 WR 9DM2 ITEM CODE NO. DESCRIPTION REMARKS USED Printed in Japan -- - 4 -- - 3 -- 04 (040325N)

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