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Hitachi WH 12DH Technical Data And Service Manual
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Hitachi WH 12DH Technical Data And Service Manual

Hitachi WH 12DH Technical Data And Service Manual

Cordless impact driver, cordless impact wrench
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See also: Operation Manual & Safety Instructions
CORDLESS IMPACT DRIVER
CORDLESS IMPACT WRENCH
LIST No. F829, 830
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
WH 12DH
WR 12DH
WH 12DH
Mar. 1999
MODEL
WH 12DH
WR 12DH
POWER TOOLS
TECHNICAL DATA
SERVICE MANUAL
WR 12DH
AND
W

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Summary of Contents for Hitachi WH 12DH

  • Page 1 MODEL WH 12DH WR 12DH POWER TOOLS CORDLESS IMPACT DRIVER WH 12DH TECHNICAL DATA CORDLESS IMPACT WRENCH WR 12DH SERVICE MANUAL WR 12DH WH 12DH LIST No. F829, 830 Mar. 1999 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 12DH Competitor Symbol Utilized Model Name Company Name...

  • Page 3: Table Of Contents

    [ Appendix ] Assembly Diagram for WH 12DH • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •...

  • Page 4: Product Name

    Now, we bring out the new cordless impact driver Model WH 12DH developed based on the previous Model WH 12DC. The Model WH 12DH has more compact body, better tightening performance and longer service life than those of the previous model, and is equipped with a replaceable carbon brush motor.

  • Page 5: Selling Points

    180 mm (7-1/8") Optional socket Variable speed reversible switch with electric brake Cordless Impact Driver WH 12DH Cordless Impact Wrench EB 12B (2.0 Ah) / EB 12H (2.2 Ah) Battery WR 12DH for longer use per charge --- 2 ---...

  • Page 6: Selling Point Descriptions

    5-1. Selling Point Descriptions (1) Faster tightening speed The Model WH 12DH provides faster driving speed than the previous model thanks to the high power rare- earth magnet motor and the higher moment of inertia of the hammer. The comparisons with the previous Model WH 12DC and maker C's model are shown below.
  • Page 7 (5.31 lbs) (3) Improved motor performance The Models WH 12DH and WR 12DH are compact and have high power thanks to the rare-earth magnet motor. Furthermore, these models have better heat resistance because the built-in fan enhances cooling efficiency. Their motors have replaceable carbon brushes, and the service life of the carbon brush has been extended by increasing its volume (by about 30 % compared to our previous model) and making seven slots in a motor armature core.
  • Page 8 (5) Safe handle shape Compared with the previous WH 12DC, the housing of the Model WH 12DH produces no clearance caused by vibration because grips (R) and (F) (made of rubber) are provided at the juncture of the handle and the housing is secured with two screws at the center of the handle to prevent the operator's hand from being pinched.

  • Page 9: Specifications

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

    Stays ON constantly because storage battery Green pilot lamp is lit temperature temperature is too high. 6-2. Optional Accessories (1) Optional accessories for the Model WH 12DH Plus driver bit Bit No. Code No. No. 2 992671 50 mm (2") No.
  • Page 11 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 12DH Each dimension and applicable bolt for each hexagon socket Shape C Shape D Shape B...
  • Page 12 Square Nominal diameter of applicable bolts Dihedral Socket primary dimensions (mm) drive Code Shape Part Name width Inch dimension H (mm) (ordinary) (small type) screw (high-strength) 12 mm 955138 W 5/16" (25/32") (25/32") (2-3/64") (5/16") (15/32") (1-11/32") 21.5 13 mm 955139 (53/64") (2-3/64")
  • Page 13 (3) Optional accessories for the Models WH 12DH and WR 12DH Holster (Code No. 307824) Use the holster to hold the unit during its operation. Carefully read the warnings attached to the holster for safe use. Hook (Code No. 308090) Use the hook to hold the unit during its operation.

  • Page 14: Comparisons With Similar Products

    7. COMPARISONS WITH SIMILAR PRODUCTS 7-1. Specification Comparisons (Cordless Impact Driver) Maker HITACHI Model WH 12DH WH 12DC 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 15: Specification Comparisons (Cordless Impact Wrench)

    7-2. Specification Comparisons (Cordless Impact Wrench) Maker HITACHI Model WR 12DH WH 12D 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 16: Tightening Torque

    7-3-1. Tightening Torque Characteristic comparisons The Model WH 12DH and WR 12DH provide greater tightening torque than that of the previous models thanks to the high power rare-earth magnet motor and the higher moment of inertia of the hammer. The tightening torque does not drop even when loosening bolts because the motor runs at the same torque and speed in both the forward and reverse directions.
  • 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. 5 below list data relative to the strength grade of various screws and the appropriate tightening torque.
  • Page 18 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 12DH 5/16" x 1-3/6" 8/8" x 1-3/6" (kgf (kgf • • (M8 x 30 mm)
  • Page 19 Model WR 12DH 5/16" x 1-3/6" 8/8" x 1-3/6" (kgf (kgf • • (M8 x 30 mm) (M10 x 30 mm) 1000 1000 (98 N m, 72 ft-lbs) (98 N m, 72 ft-lbs) • • High-strength bolt (78.4 N m, 58 ft-lbs) (78.4 N m, 58 ft-lbs) •...

  • Page 20: Number Of Screws Or Bolts Driven

    (1) Number of screws or bolts driven (Cordless impact driver) Model HITACHI HITACHI Tightening condition WH 12DH WH 12DC 1222 Battery EB 12B EB 12B (Corresponding EB 12B) Wood screw 3.8 mm dia.
  • Page 21 7-4-2. Tightening Time and Number of Screws Driven Per Battery Charge (pcs.) Fig. 7 shows the relationship between the tightening time and the number of screws which can be tightened in a single battery charge in the case of the EB 12B. (Tightening time is defined as the period of time elapsed from the commencement of the screw tightening operation EB 12B...

  • 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 12B or EB 12H 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

    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 12DH and WR 12DH 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 (1) Voltage of battery Tightening torque is affected by the voltage output of the battery. For example, the relationship between tightening torque and the number of M14 x 50 mm (9/16" x 1-7/8") high-strength bolts tightened is shown in Fig. 8 below. As can be seen in the graph, tightening torque decreases as the number of bolts tightened increases.

  • Page 26: Suggestions And Precautions For The Efficient Use Of The Charger

    (6) Wear and looseness of the socket With extended use, the hexagonal portion of the socket which is fitted to the head of the bolt or drill bit, and/or hexagonal portion of the driver chuck which is fitted onto the anvil in the main body will become worn and loose.

  • 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 12DH, < >: WR 12DH ) 10-1-1. Disassembly (1) Removal of the Hammer Case [6] <2> and the Inner Cover [21] <19>...
  • Page 29 Small flat-blade screwdriver Anvil (B) [8] Retaining Ring [1] Washer (D) [2] Gap of retaining ring Guide Sleeve [4] Fig. 9-1 Fig. 9-2 Hold the body and adjust gap of the retaining ring to Press down the washer (D) with the screwdriver. groove of the anvil (B), then insert a small flat-blade screwdriver into the groove at an angle.
  • Page 30 Remove the hammer assembly from the J-297 base for washer (S) and support the end surface of the Spindle [15] <13>. With a hand press, push down either of the raised faces of the Hammer [10] <7> to compress the Spring [12] <10>.
  • Page 31 Motor Pinion Fin Ass'y [32] <30> (Purple) (Black) Projection of forward/ reverse lever Flag terminal Machine screw [29] <27> (M3 x 5) S-Tight Screw [36] <34> (D3.5 x 6) DC-Speed Control Switch [30] <28> Fig. 12-1 Internal wire (black) Internal wire (purple) Schematic diagram viewed from A Fig.
  • Page 32 Secure the above assembly with the four Tapping Screws D4 x 30 [5] <1>. (5) Reassembly of the Guide Sleeve [4] (for WH 12DH only) Insert the Steel Ball D3.5 [7] into the hole of the Anvil (B) [8]. Mount the Guide Sleeve [4], the Guide Spring [3] and Washer (D) [2] in sequence.

  • Page 33: Precautions In Disassembly And Reassembly Of Battery Charger

    Pinion tooth flanks of the Motor [23] <21> Tooth flanks of the Ring gear [18] <16> Twenty-five Steel Balls D3.5 [7] <8> (b) HITACHI MOTOR GREASE No. 29 (for WH 12DH only) Steel Ball D3.5 [7] Sliding section of Anvil (B) [8] and the Guide Sleeve [4] (8) Screw tightening torque Tapping Screw (with sp.

  • Page 34: Standard Repair Time (Unit) Schedules

    11. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow WH 12DH WR 12DH Handle Cover Housing Switch Terminal Piece Inner Cover Motor O-Ring Rubber Ring General Assembly Hammer Case Steel Ball Fixed Cost Washer Hammer Ass'y...

  • Page 35: Assembly Diagram For Wh 12Dh

    Assembly Diagram for WH 12DH --- 32 ---...
  • Page 36 WH 12DH PARTS ITEM CODE NO. DESCRIPTION REMARKS USED 315-984 RETAINING RING 315-983 WASHER (D) 315-982 GUIDE SPRING 315-981 GUIDE SLEEVE 307-851 TAPPING SCREW (W/SP. WASHER) D4X30(BLACK 317-339 HAMMER CASE 315-980 STEEL BALL D3.5 317-338 ANVIL (B) 959-154 STEEL BALL D5.556 (10 PCS.)

  • Page 37: Standard Accessories

    WH 12DH STANDARD ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (MODEL UC 14YF) DEPENDING ON ORDER SPEC. CHARGER (MODEL UC 14YF2) DEPENDING ON ORDER SPEC. 306-306 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...

  • Page 38: Assembly Diagram For Wr 12Dh

    Assembly Diagram for WR 12DH --- 35 ---...
  • Page 39 MACHINE SCREW (W/SP. WASHER) M3X5 316-783 DC-SPEED CONTROL SWITCH 316-166 PUSHING BUTTON 316-179 FIN ASS’Y INCLUD.34 316-178 GRIP (F) HITACHI LABEL 306-952 STRAP 311-131 S-TIGHT SCREW D3.5X6 316-177 GRIP (R) 310-378 BATTERY EB 12B (W/ENGLISH N.P.) 310-452 BATTERY EB 12B (W/ENGLISH N.P.)
  • Page 40 CODE NO. DESCRIPTION REMARKS USED CORNER ATTACHMENT ASS’Y INCLUD.602-618 955-300 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 955-307 PINION...
  • Page 41 WR 12DH OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 873-624 HEX. SOCKET ASS’Y 19MMX34L INCLUD.617,618 873-626 HEX. SOCKET ASS’Y 21MMX36L INCLUD.617,618 873-627 HEX. SOCKET ASS’Y 22MMX40L INCLUD.617,618 986-058 HEX. SOCKET FOR PLASTIC CONE 12MMX70L INCLUD.617,618 955-151 HEX. SOCKET ASS’Y (LONG) 21MMX75L INCLUD.617,618 955-138 HEX.

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