Hitachi WR 14VB Technical Data And Service Manual
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Hitachi WR 14VB Technical Data And Service Manual

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MODEL
WR 14VB
Hitachi
Power Tools
TECHNICAL DATA
IMPACT WRENCH
AND
WR 14VB
SERVICE MANUAL
W
LIST No. E706
Feb. 2005
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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  • Page 1 MODEL WR 14VB Hitachi Power Tools TECHNICAL DATA IMPACT WRENCH WR 14VB SERVICE MANUAL LIST No. E706 Feb. 2005 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT...
  • Page 2 REMARK: Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol is used in the place of company name and model name of our competitor. The symbol utilized here is as follows: Competitor Symbol Utilized Company Name Model Name TW0200 MAKITA...

  • Page 3: Table Of Contents

    8. OTHER PRECAUTIONS ......................12 9. REPAIR GUIDE ..........................13 9-1. Disassembly ..........................13 9-2. Reassembly ..........................16 9-3. Insulation Tests ..........................18 9-4. No-load Current Value ........................19 10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..............20 Assembly Diagram for WR 14VB...

  • Page 4: Product Name

    The Model WR 14VB is powerful and novel thanks to the 3-D CAD engineering as well as the double-layer molding and improved handle grip to plainly differentiate it from the competitors.

  • Page 5: Selling Point Descriptions

    4-1. Selling Point Descriptions (1) Class-top tightening torque With the powerful motor and the computer analysis, the Model WR 14VB gives optimum impact at tightening screws and the tightening torque is the highest level in this class. (2) While the conventional Model WH 14 has the resin housing directly secured with screws, the Model WR 14VB has the housing containing a brass insert screw for secure screw connection with the aluminum hammer case (the screw tightening torque is 2 times greater than the Model WH 14).
  • Page 6 (5) Housing is covered with elastomer entirely The Model WR 14VB gives no scratch on the floor etc. where it is placed because the housing is covered with elastomer entirely. In addition, the elastomer-covered housing prevents the Model WR 14VB from slipping on a slanted surface such as a roof.

  • Page 7: Specifications

    5. SPECIFICATIONS 5-1. Specifications Model WR 14VB Item Ordinary bolt M10 (3/8") to M18 (23/32") Capacity High-strength bolt M8 (5/16") to M14 (9/16") Tightening torque 250 N m 2,550 kgf cm (2,210 in-lbs.) • • Tip condition 12.7 mm (1/2") (Width across flat of the socket mounting portion)

  • Page 8: Optional Accessories

    5-2. Optional Accessories (1) Each dimension and applicable bolt for each hexagon socket Shape B Shape C Shape D Socket primary Square Nominal diameter of applicable bolts Dihedral Code drive dimensions (mm) Part name width High- Inch dimension (Small H (mm) tension Sq (mm) (Ordinary)
  • Page 9 (3) Extension bar (Code No. 873633) (4) Corner attachment (EW-14R) (5) Universal joint (Code No. 986062) (6) Holster (Code No. 307824) --- 6 ---...

  • Page 10: Comparisons With Similar Products

    6-1. Specification Comparisons <Table 1> Maker Model HITACHI HITACHI • Item WR 14VB WH 14 M 10 to M 16 M 10 to M 18 M 10 to M 16 Ordinary bolt Capacity M 8 to M 12 M 8 to M 14...

  • Page 11: Tightening Torque

    1500 WH14 (1301 in-lbs.) 1000 (867 in-lbs.) The Model WR 14VB provides higher tightening torque than C thanks to the operation with the optimum impact timing. (434 in-lbs.) Tightening time (S) Bolt: M16 x 55 high tension bolt Steel plate: SS34P, 25 mm in thickness Fig.

  • Page 12: Appropriate Tightening Torque For Bolts

    6-3. Appropriate Tightening Torque for Bolts Generally speaking, the appropriate tightening torque for a bolt can be determined by the strength grade of the bolt and the material tightened. Tables 2, 3 and 4 below list data relative to the strength grade of various bolts and the appropriate tightening torque.

  • Page 13: Tightening Torque Characteristics When Using An Extension Cord

    7-1. Safety Instructions In the interest of promoting the safest and most efficient use of the Model WR 14VB 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 14: Tightening Torque Inspection Prior To Operation

    The tightening torque of an impact wrench is influenced by voltage. For example, the tightening torque will be reduced to about 90% if the Model WR 14VB is operated with 90% of the rated voltage. The line voltage may be reduced by the use of a long extension cord depending on the work sites. Take the following countermeasures against voltage reduction caused by the resistance of an extension cord and the load current.

  • Page 15: Temperature Rise

    7-4. Temperature Rise If the Model WR 14VB is used for tightening bolts which require long time to be tightened continuously, it will cause temperature rise of the motor and burnout subsequently. Advise the customer to perform no-load operation for several minutes to cool the motor if the outside of the main body becomes hot.

  • Page 16: Repair Guide

    The procedures and the precautions in disassembly and reassembly are described below. The [bold] numbers correspond to the item numbers in the Parts List and the exploded assembly diagram of the Model WR 14VB. 9-1. Disassembly (1) Removal of the hammer case assembly (a) Removal of the Hammer Case Ass'y [3] Remove the four Seal Lock Hex.
  • Page 17 [10] [11] [12] [15] [16] [17] Fig. 5 (3) Removal of the Armature [25] Remove the Tapping Screw (W/Flange) D4 x 20 (Black) [47] from the Tail Cover [46] to remove the Tail Cover [46]. Remove the Brush Cap [55] and the Carbon Brushes [56]. Then the Armature [25] can be removed together with the Inner Cover [21] from the Housing Ass'y [58].
  • Page 18 [33] [34] [35] [36] [37] [38] [28] [29] [30] [48] [49] [50] [31] [51] [32] [52] Fig. 7 Fig. 9 Fig. 8 [NOTE] If the leaf spring is warped excessively, it may be deformed permanently and the contact pressure with the internal wires may be decreased.

  • Page 19: Reassembly

    9-2. 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) Mounting the switch Pay attention to the relationship between the terminal numbers of the Switch [36] and the colors of the internal wires.
  • Page 20 (b) Mounting the diode switch The Diode Switch [48] is equipped with a high-speed/low-speed switch and a diode. Mount the Diode Switch [48] to the specified position of the Housing Ass'y [58] as shown in Fig. 12. At this time, position the high-speed/low-speed switch in the same direction of "H"...

  • Page 21: Insulation Tests

    (4) Mounting the cord clip Cord dia. : 8.5 mm max. Cord dia. : Over 8.5 mm [49] [50] Fig. 14 (5) Grease Greasing locations (a) Apply grease (Doubrex 251) to the following locations. Spindle [16]: Cam groove, sliding section and engaged portion with the Anvil [6] Hammer [8]: Cam groove, sliding section and the click Steel Balls D6.35 [7] Steel Balls D3.97 [9]...

  • Page 22: No-Load Current Value

    9-4. No-load Current Value After no-load operation for 30 minutes, the no-load current should be as follows. 110 V ..2.5 A or lower 120 V ..2.4 A or lower 220 V ..1.2 A or lower 230 V ..1.3 A or lower 240 V ..

  • Page 23: Standard Repair Time (Unit) Schedules

    10. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow WR 14VB Housing Ass'y Stator Switch Handle Cover Diode Switch Cord Armor Armature Cord Ball Bearing (608DD) Ball Bearing (608VV) Inner Cover Ball Bearing (6907ZZ) General Assembly...
  • Page 24 Hitachi Power Tools LIST NO. E706 ELECTRIC TOOL PARTS LIST IMPACT WRENCH 2004 • • Model WR 14VB (E1) 503 504 505...
  • Page 25 PARTS WR 14VB ITEM CODE NO. DESCRIPTION REMARKS USED 323-804 BUMPER (B) 324-060 SEAL LOCK HEX. SOCKET HD. BOLT M5X40 323-803 HAMMER CASE ASS’Y INCLUD. 1, 4, 5 318-704 O-RING (M) 323-766 METAL 323-773 ANVIL (G) TYPE FOR W/O PLUNGER (A), PIN RETAINER (A) 985-207 ANVIL (B) ASS’Y...
  • Page 26 PARTS WR 14VB ITEM CODE NO. REMARKS DESCRIPTION USED 985-198 RUBBER WASHER 323-754 BEARING BUSHING (B) 323-782 TAIL COVER 301-653 TAPPING SCREW (W/FLANGE) D4X20 (BLACK) 317-533 DIODE SWITCH 984-750 TAPPING SCREW (W/FLANGE) D4X16 937-631 CORD CLIP 953-327 CORD ARMOR D8.8 938-051 CORD ARMOR D10.1...

  • Page 27: Standard Accessories

    STANDARD ACCESSORIES WR 14VB ITEM CODE NO. DESCRIPTION REMARKS USED * 501 323-797 SIDE HANDLE ASS’Y INCLUD. 502-505 FOR NZL, HOL, BEL, FRA, FRG, ITA, ESP, AUT * 502 980-901 SIDE HANDLE FOR SIDE HANDLE ASS’Y * 503 323-775 HANDLE HOLDER FOR SIDE HANDLE ASS’Y...
  • Page 28 OPTIONAL ACCESSORIES WR 14VB ITEM CODE NO. REMARKS DESCRIPTION USED 873-626 HEX. SOCKET ASS’Y 21MMX36L INCLUD. 628, 629 873-627 HEX. SOCKET ASS’Y 22MMX40L INCLUD. 628, 629 873-628 HEX. SOCKET ASS’Y 23MMX40L INCLUD. 628, 629 873-629 HEX. SOCKET ASS’Y 24MMX40L INCLUD. 628, 629 873-630 HEX.
  • Page 29 WR 14VB ITEM CODE NO. DESCRIPTION REMARKS USED Printed in Japan --- 6 --- 12 -- 04 (041230N)

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