Hitachi WH 8DH Technical Data And Service Manual
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Hitachi WH 8DH Technical Data And Service Manual

Hitachi WH 8DH Technical Data And Service Manual

Cordless impact driver/cordless impact wrench
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Download this manual See also: Operation Manual & Safety Instructions
CORDLESS IMPACT DRIVER
CORDLESS IMPACT WRENCH
LIST Nos. WH 8DH: F832
WR 8DH: F833
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
WH 8DH
WR 8DH
WH 8DH
Jul. 1999
MODEL
WH 8DH
WR 8DH
POWER TOOLS
TECHNICAL DATA
SERVICE MANUAL
WR 8DH
AND
W

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Summary of Contents for Hitachi WH 8DH

  • Page 1 WR 8DH POWER TOOLS CORDLESS IMPACT DRIVER WH 8DH TECHNICAL DATA CORDLESS IMPACT WRENCH WR 8DH SERVICE MANUAL WR 8DH WH 8DH LIST Nos. WH 8DH: F832 Jul. 1999 WR 8DH: F833 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 8DH Competitor Symbol Utilized Model Name Company Name...

  • Page 3: Table Of Contents

    [ Appendix ] Assembly Diagram for WH 8DH • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •...

  • Page 4: Product Name

    Model WH 8D2 and its square drive dimension is 12.7 mm (1/2") for use of commercially-available 1/2" sockets. The construction of the Model WR 8DH is the same as that of the Model WH 8DH except the anvil (K) assembly and the hammer case.

  • Page 5: Selling Points

    4. SELLING POINTS (1) Cordless Impact Driver: WH 8DH Faster screw fastening Longer service life Higher fastening torque Improved motor performance 88.2 N m (900 kgf cm, 65 ft-lbs) • Replaceable carbon brushes for longer • • motor life •...
  • Page 6 (2) Cordless Impact Wrench: WR 8DH Higher fastening torque Longer service life 98 N m (1000 kgf cm, 72 ft-lbs) • • Improved motor performance [12.7 mm (1/2") Square drive] • Replaceable carbon brushes for longer motor life • High-power fan-cooled DC magnet motor •...

  • Page 7: Selling Point Descriptions

    6.8 sec. (2) Improved motor performance The Models WH 8DH and WR 8DH have high power thanks to the fan cooled DC magnet motor. They 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 size by about 70 % (volume) compared to our previous model.

  • Page 8: Specifications

    5. SPECIFICATIONS 5-1. Specifications Model Cordless Impact Driver Cordless Impact Wrench Item WH 8DH WR 8DH 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 9: Optional Accessories

    High battery Stays ON constantly because storage battery Green pilot lamp is lit temperature temperature is too high. 5-2. Optional Accessories (1) Optional accessories for the Model WH 8DH • Plus driver bit Bit No. Code No. No. 2 992671 50 mm (2")
  • Page 10 • 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 8DH • Each dimension and applicable bolt for each hexagon socket Shape C Shape D Shape B...
  • Page 11 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 12 (3) Optional accessories for the Models WH 8DH and WR 8DH • 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 13: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons (Cordless Impact Driver) Maker HITACHI Model WH 8DH WH 8DA2 Item M 5 --- M 8 M 4 --- M 8 M 4 --- M 8 Small screw (3/16" --- 5/16") (5/32" --- 5/16") (5/32"...

  • Page 14: Specification Comparisons (Cordless Impact Wrench)

    6-2. Specification Comparisons (Cordless Impact Wrench) Maker HITACHI Model WR 8DH WH 8D2 Item M 6 --- M 14 M 5 --- M 12 Ordinary bolt (1/4" --- 9/16") (3/16" --- 15/32") Capacity M 6 --- M 10 M 5 --- M 10 High-strength bolt (1/4"...

  • Page 15: Tightening Torque

    6-3-1. Tightening Torque Characteristic Comparisons The Model WH 8DH and WR 8DH provide greater tightening torque than the previous models thanks to the high power 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 16 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. 5 below list data relative to the strength grade of various screws and the appropriate tightening torque.
  • Page 17 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 8DH M8 x 30 mm M10 x 30 mm (kgf (kgf • • (5/16" x 1-3/6") (8/8"...
  • Page 18 • Model WR 8DH M8 x 30 mm M10 x 30 mm (5/16" x 1-3/6") (8/8" x 1-3/6") (kgf (kgf • • 1200 1200 (117.6 N m,86 ft-lbs) (117.6 N m,86 ft-lbs) • • 1000 1000 High-strenge bolt (98 N m,72 ft-lbs) (98 N m,72 ft-lbs)

  • Page 19: Tightening Speed

    6-4. Tightening Speed Tightening speed comparisons of the Model WH 8DH with the previous Model WH 8DA2 and maker C's model are shown below. The data shown below are intended for reference purposes only because actual tightening speed will vary depending on the tightening conditions such as ambient temperature, charging capacity and workpieces.

  • Page 20: Number Of Screws Or Bolts Driven

    5 Tightening time (sec.) (Teks screw 4 mm dia. x 13 mm length, SPCC 1.6 t ) sec. Model HITACHI WH 8DH 2.5 sec. HITACHI WH 8DA2 3.0 sec. 3.0 sec. 6 Tightening time (sec.) (Wood screw 3.8 mm dia. x 20 mm length, lauan) sec.
  • Page 21 (2) Ordinary bolt (Cordless impact wrench) Model HITACHI HITACHI Tightening condition WR 8DH WH 8D2 Battery EB 9B EB 9B Number of bolts ordinary bolt Time (sec.) Number of bolts ordinary bolt Time (sec.) Number of bolts ordinary bolt Time (sec.) 6-5-2.

  • 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 9H 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 8DH and WR 8DH 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 M12 x 45 mm (15/32" x 1-3/4") 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

    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 28: 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 8DH, < >: WR 8DH ) 9-1-1. 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 washer (D) with the screwdriver. groove of 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 M3 x 5 [29] <27> S-Tight Screw D3.5 x 6 [36] <34> 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 8DH only) Insert the Steel Ball D3.5 [7] into the hole of 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

    • Tooth flanks of the Ring Gear [18] <16> • Twenty-five Steel Balls D3.5 [7] <8> (b) HITACHI MOTOR GREASE No. 29 (for WH 8DH only) • Steel Ball D3.5 [7] • Sliding section of Anvil (B) [8] and the Guide Sleeve [4] (8) Screw tightening torque •...

  • Page 34: Standard Repair Time (Unit) Schedules

    11. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow WH 8DH WR 8DH Switch Housing Inner Cover Motor General Assembly Hammer Case Steel Ball Fixed Cost Washer Hammer Ass'y Switch 0 min. Anvil Spring Others 20 min.

  • Page 35: Assembly Diagram For Wh 8Dh

    Assembly Diagram for WH 8DH --- 32 ---...
  • Page 36 WH 8DH 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 WH 8DH STANDARD ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER(MODEL UC 14YF2) DEPENDING ON ORDER SPEC. 306-306 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-662 BATTERY EB 9H (W/ENGLISH N.P.) EXCEPT FOR TPE,NZL,AUS,SIN,USA 992-671 + DRIVER BIT (B) NO.2 50L 992-672 + DRIVER BIT (B) NO.3 50L...

  • Page 38: Assembly Diagram For Wr 8Dh

    Assembly Diagram for WR 8DH --- 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) 310-377 BATTERY EB 9B (W/ENGLISH N.P.) 310-450 BATTERY EB 9B (W/ENGLISH N.P.)
  • Page 40 WR 8DH STANDARD ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED CHARGER (MODEL UC 14YF2) DEPENDING ON ORDER SPEC. 306-306 CASE OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-662 BATTERY EB 9H (W/ENGLISH N.P.) EXCEPT TPE,NZL,AUS,SIN,USA CORNER ATTACHMENT (MODEL EW-14R) INCLUD.603-618 955-300 HOUSING...
  • Page 41 WR 8DH OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 986-058 HEX. SOCKET FOR PLASTIC CONE 12MMX70L INCLUD.617,618 955-138 HEX. SOCKET ASS’Y (LONG) 12MMX52L INCLUD.617,618 955-139 HEX. SOCKET ASS’Y (LONG) 13MMX52L INCLUD.617,618 955-140 HEX. SOCKET ASS’Y (LONG) 14MMX52L INCLUD.617,618 955-141 HEX.

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