Hitachi WF 4V Service Manual

POWER TOOLS

TECHNICAL DATA

AND

SERVICE MANUAL

AUTOMATIC SCREW DRIVER

WF 4V

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. 0783 Nov. 1999

MODEL

WF 4V

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:

Symbols Utilized

Competitors

Company Name

Model Name

MAKITA

6830

Page

CONTENTS

[ Business Section ]

1. PRODUCT NAME

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2. MARKETING OBJECTIVE

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3. APPLICATIONS

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4. SELLING POINTS

4-1. Selling Point Descriptions

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5. SPECIFICATIONS

5-1. Specifications

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5-2. Standard Accessories

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5-3. Optional Accessories

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6. COMPARISONS WITH SIMILAR PRODUCTS

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6-1. Specification Comparisons

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6-2. Characteristics Comparisons

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7. PRECAUTIONS IN SALES PROMOTION

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7-1. Safety Instructions

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7-2. Precautions in Sales Promotion

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[ Service Section ]

8. TROUBLESHOOTING

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8-1. Troubleshooting Guide

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9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY

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9-1. Disassembly and Reassembly of the Feeder Unit and Handling Precautions

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9-1-1. Disassembly

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9-1-2. Reassembly

9-1-3. Tightening Torque

9-1-4. Confirmation After Reassembly

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9-2. Precautions in Disassembly and Reassembly of the Main Body

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9-2-1. Disassembly

9-2-2. Reassembly

9-2-3. Insulation Tests

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9-2-4. No-load Current Value

10. STANDARD REPAIR TIME (UNIT) SCHEDULES

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[ Appendix ]

Assembly Diagram for WF 4V

Notice for use

Specifications and parts are subject to change for improvement. Refer to Hitachi Power Tool Technical News for further information.

--- 1 ---

Tool-less detachable collated screw feed attachment Two kinds of uses, as a collated screwdriver and an

impact driver Capable of retightening protruded screws

1. PRODUCT NAME

Hitachi Automatic Screwdriver, Model WF 4V

2. MARKETING OBJECTIVE

This machine is an impact type screwdriver designed for use with collated screws. The screw feed attachment at the head of the machine is detachable without tools. The Model WF 4V is also capable of driving ordinary bolts and wood screws that are not collated and retightening protruded screws. The new functions and higher performance of this multi-purpose screwdriver which uses Hitachi's innovative technology assure greater demand and increased sales in this category of products.

3. APPLICA TIONS

Continuous drywall screw driving by using collated screws or screw strips Driving various individual screws and bolts with the collated screw strip attachment removed Drilling holes into various materials

4. SELLING POINTS

Can be use as a drilling tool by removing the screw feed attachment (with use of Drill Chuck Adapter Set).

Impact method permits screws with small recoil force to be driven.

Easy work due to small holding force Less damage to screw heads

--- 2 ---

In Fig. 2, the solid line indicates the screw tightening load applied with the impact mechanism, and the broken line a typical load required with the conventional claw clutch system. As the screw is tightened, tightening torque rises with the screw's pushing into the work. Increasing downward pressure is required when the screw slips off the tape because, on the one hand, the clutch cannot be disengaged without such force and on the other hand, the bit and the screw cannot be separated apart otherwise. Both could be reasons for incomplete driving when insufficient pressure is applied. First referring to the claw clutch system, since the clutch disengaging torque is strong, increasing pressure must be applied to the screw as it is pushed in, because the clutch claws would otherwise disengage, making further screw tightening impossible. As a result, the required force goes on rising, as indicated by the dotted line, until screw tightening is finished.

Screw position

Load

4-1. Selling Point Descriptions

(1) An impact mechanism that allows screw tightening with a smaller thrust, plus our unique collated screw feed

attachment The WF 4V employs an impact mechanism which is capable of tightening screws with a smaller thrust than with the claw clutch system used for competitors' screwdrivers. The way it works is schematically illustrated in Fig. 2.

With the impact system, on the contrary, it is sufficient to apply only enough force to keep the bit and screw together, because hammering impact provides the necessary torque as the tightening torque increases, with no need for the operator to increase pressure against the workpiece. The load indicated by solid line in Fig. 2 should be enough for optimum tightening. However, the actual load required will be such as indicated by the chain line in Fig. 2 because it is very difficult for operators to take the force off as soon as the screw slips off the tape.

(2) The WF 4V can be used as an impact screwdriver by removing the collated screw feed attachment:

For re-tightening jobs or other operations

Spring load

Pressure force of claw clutch system

Pressure force of impact mechanism

Slipping force

of tape

Fig. 2

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(3) The collated screw feed attachment can be removed without tools.

Tool-less detachment is possible for the collated screw feed attachment, making bit replacement and reworking much easier. This improved operability of the WF 4V will be a great selling point because the competitors' collated screw feed attachments must be secured by means of a hexagon socket head cap screw or the like.

Note: Ensure that the power plug is disconnected from the receptacle prior to the attachment removal.

1. Hitachi WF 4V

2. C

Attachment mechanism

Instructions

Holding the main unit with one hand, turn the collated screw feed attachment with the other in the direction indicated by the arrow in Fig. 3-1. Register the mark on the main unit with the mark on the attachment and remove by pulling it in the direction indicated in Fig. 3-2.

Loosen the hexagonal socket head bolt securing the casing with a hexagonal wrench and remove by pulling it in the direction indicated by the arrow.

Fig. 3-2

Fig. 3-1

Fig. 3-3

Hexagon socket head cap screw

Casing

mark

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5. SPECIFICA TIONS

5-1. Specifications

Table 1

Capacity

Single phase AC: 50/60 Hz Voltage: 240 and 230 V

Tightening torque

D4 x 25-41 mm (5/32" dia. x 1" --- 1-5/8") Collated screw strips (50 screws) Note 1) Max. 1,000 kgf•cm [98 N•m] (72.3 ft-lb) Dihedral width: 6.35 mm (1/4") for Hex. Bit inserting

Tip configuration

Type of motor

Enclosure

Type of switch Handle configuration Full-load current

Overall length x height

5-2. Standard Accessories

(1) Philips bit [Code No. 313880] (2) Belt guide [Code No. 314283] (3) Rubber cover (B) [Code No. 314629] (4) Hook [Code No. 307343] (5) Plastic case [Code No. 306854]

Impact rate

Single-phase AC commutator motor

Without cord Packaged

Packaging

Standard accessories

Weight

Type and number of screws

Power supply

Power input No-load rotation speed

Center height

Housing: Polyamide resin Slider (A), (B) and (C): Polycarbonate resin Slider Case (A) and (B): Polycarbonate resin Belt Guide (A) and (B): Polycarbonate resin

Variable speed trigger switch with forward/reverse changeover lever D-type

1.3 A (240 V) and 1.4 A (230 V) 300 W 0-2,300 /min. 0-3,400 /min.

1.8 kg (4.0 lbs.)

3.8 kg (8.4 lbs.) Corrugated cardboard box [with plastic case] 354 mm (13-15/16") x 197 mm (7-3/4") 26 mm (1-1/64")

Philips bit

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1 pc.

Belt guide

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1 pc.

Rubber cover (B)

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1 pc.

Hook

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1 pc.

Plastic case

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1 pc.

Note 1) Based on tightening an M12 (15/32") bolt (Strength Grade: 12.9) for 3 sec. with a hexagon socket.

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5-3. Optional Accessories

The optional parts listed below can be used when the collated screw feed attachment has been removed. Phillips bit

50 mm (2")

Bit No.

No. 2 No. 3

Code No.

992671 992672

Hexagon socket

Stamped figures

996177 8 (5/16")65 (2-9/16") 8

Stamped figures

5 mm Hexagon socket

Part Name

(mm)

Code No.

98532910 (3/8")65 (2-9/16")106 mm Hexagon socket 99617812 (15/32")65 (2-9/16")125/16" Hexagon socket 99617913 (1/2")65 (2-9/16")138 mm Hexagon socket 99618014 (9/16")65 (2-9/16")1410 mm Hexagon socket (small type) 99618116 (5/8")65 (2-9/16")1610 mm Hexagon socket 99618217 (21/32")65 (2-9/16")1710 mm Hexagon socket 99619721 (13/16")166 (6-17/32")211/2" Hexagon long socket

Woodworking drill bit (Code No. 959183)

14 mm dia.

(35/64")

83 mm (3-17/64")

Fig. 4

Fig. 5

Table 2

Table 3

Fig. 6

Drill chuck adapter set (Code No. 996195) The drill chuck adapter set permits mounting of various types of locally - available drill bits for a variety of drilling operations.

Fig. 7

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6. COMPARISONS WITH SIMILAR PRODUCTS

6-1. Specification Comparisons

Table 4

Hitachi WF 4V

4 (5/32")

25 --- 41 (1" --- 1-5/8")

300

0 --- 2,300

1.8 (4.0 lbs.)

(1.85) (4.08 lbs.)

Impact type

345

---

354

(13-19/32" --- 13-15/16")

197 (7-3/4")

76 (3")

17.2 [1.69 N

•

(1.24 ft-lb) Plastic case Phillips bit Hook Rubber cover (B) Belt guide

Maker/Model

Item Capacity: Screw size Screw length Power input No-load speed Weight (without cord) (Actual weight) No-load noise level Tightening torque structure

Dimensions Height Width Moment from centroid to grip

Standard accessories

Unit

mm mm

/min.

mm mm

•

4 (5/32")

25 --- 40 (1" --- 1-9/16")

470

0 --- 4,700

1.9 (4.2 lbs.)

(1.97) (4.34 lbs.)

Clutch type

334

---

342

(13-5/32" --- 13-19/32")

191 (7-17/32")

76 (3")

18.7 [1.83 N

•

(1.35 ft-lb) Plastic case Phillips bit Hook Hex. bar wrench

Hitachi W 4YF

4 (5/32")

20 --- 41 (25/32" --- 1-5/8")

430

4,000

1.8 (4.0 lbs.)

(1.78) (3.92 lbs.)

Clutch type

345

---

361

(13-19/32" --- 14-7/32")

135 (5-5/16")

80 (3-5/32")

23.4 [2.29 N

•

(1.69 ft-lb) Plastic case Phillips bit Hook Top adjuster No.1 Top adjuster No.2

Hitachi WF 4DY 4 (5/32")

25 --- 41 (1" --- 1-5/8")

DC 12V

0 --- 2,000

2.0 (4.4 lbs.)

(2.04) (4.50 lbs.)

Impact type

369

---

378

(14-17/32" --- 14-7/8")

202 (7-15/16")

73 (2-7/8")

17.4 [1.71 N

•

(1.26 ft-lb) Plastic case Phillips bit Hook Charger Battery

6-2. Characteristics Comparisons

6-2-1. Defect Rate Comparison

While defect rates depend on manufacturing irregularity of screws, materials to be tightened and operator's skill, reference data at the factory testing result are shown below.

Testing method: Perform positioning by gently applying the tip end of the main unit to the material to be tightened and tighten by applying further pressure. The material to be tightened: Plasterboard 9.5 (3/8") (T9.5 (3/8") x 2 for 40 mm (1-9/16") + base of

Japanese hemlock)

Screw size

Table 5

25 mm (1")

40 mm (1-9/16")

Hitachi WF 4V

0.20 %

0.40 %

1.80 %

Length

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Hitachi WF 4V Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual