Hitachi G 23SS User manual

The Models G 18SS and G 23SS have been developed to meet the market demand for low-end class products

like the Models G 10SS and G 12SS in order to expand the sales of Hitachi Disc Grinders. The main features of

the Models G 18SS and G 23SS are as follows.

(1) Excellent overload durability: 26% higher than B

(2) Protected armature coil

(3) Dust-proof ball bearing thanks to the labyrinth construction

LIST Nos.

G 18SS: E293

G 23SS: E294

Jun. 2008

PRODUCT NAME

Hitachi 180 mm Disc Grinder

Model G 18SS

Hitachi 230 mm Disc Grinder

Model G 23SS

Deburring diecast products and finishing iron, bronze, aluminum and diecast products

Finishing welds and torch-cut surfaces

Cutting soft steel materials

Grooving and cutting concrete and other stone materials

MARKETING OBJECTIVE

APPLICATIONS

SELLING POINTS

[ NEW FEATURES ]

Excellent overload durability

Protected armature coil

Dust-proof ball bearing thanks to the labyrinth

construction

International Sales Division

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

REMARK:

For more information about HANDLING INSTRUCTIONS, visit our website at:

http://www.hitachi-koki.com/manual_view_export/

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:

Competitors

Symbols Utilized Company Name Model Name

B MAKITA 9067/9069

CONTENTS

Page

SELLING POINT DESCRIPTIONS-----------------------------------------------------------------------------------------1

SPECIFICATIONS --------------------------------------------------------------------------------------------------------------3

COMPARISONS WITH SIMILAR PRODUCTS--------------------------------------------------------------------------4

PRECAUTIONS IN SALES PROMOTION--------------------------------------------------------------------------------5

REPAIR GUIDE------------------------------------------------------------------------------------------------------------------6

1. Precautions in disassembly and reassembly--------------------------------------------------------------6

STANDARD REPAIR TIME (UNIT) SCHEDULES-------------------------------------------------------------------- 12

Assembly diagram for G 18SS

Assembly diagram for G 23SS

-1-

Excellent overload durability

The Models G 18SS and G 23SS provide excellent overload durability in common with the current models.

The graph below shows the comparison of overload durability when the stator coil temperature rise is

200°K using the Model G 23SS as the reference.As is evident from this, the Models G 18SS and G 23SS

are superior to B in overload durability.

Protected armature coil

Both ends of the armature coil are protected with “long wedges” in addition to the varnish treatment to

minimize damage to the coil caused by dust.

SELLING POINT DESCRIPTIONS

Protected with “long wedges”

-2-

Dust-proof ball bearing thanks to the labyrinth construction

The ball bearing retainers at both sides of the armature have a labyrinth construction to make the ball

bearings dust-proof.

Fan

Labyrinth

Ball bearing (6301VVCM) Commutator

rmature shaft Housing

Dust seal

Bearing cover

Labyrinth Ball bearing (6000VVCM)

-3-

Voltage (V) Current (A) Power input (W)

110 18.2 1,900

120 15.0 1,700

127 14.0 1,700

220 9.1 1,900

230 8.7 1,900

240 8.3 1,900

1. Specifications

Model G 18SS G 23SS

Dimensions O.D.180 mm (7”)

x Thickness 6 mm (1/4”)

x I.D. 22.2 mm (7/8”)

O.D.230 mm (9”)

x Thickness 6 mm (1/4”)

x I.D. 22.2 mm (7/8”)

Max. practical

peripheral speed 80 m/s (15,800 ft/min)

Type A, 24, R, B

Depressed-

center wheels

Spindle thread M14 x 2 *1

Power source AC single phase 50 or 60 Hz

Voltage and power input *2

No-load speed 8,500/min *36,600/min *3

Type of motor AC single phase commutator motor

Housing (green)

Handle (black) Polyamide resin with glassfiber

Enclosure Gear cover, packing gland Aluminum alloy diecasting

Type of switch Trigger switch

New weight *4(Main body)

Gross weight 4.3 kg (9.5 lbs.)

7.3 kg (16.1 lbs.)

Type of packing Corrugated cardboard box

Standard accessories

Side handle (Code No. 937981) ---1

Wrench (Code No. 325491)--------1

Hex. bar wrench 6 mm

(Code No. 872422)-------------------1

Side handle

(Code No. 937981)----------------1

Wrench (Code No. 325491)-----1

Wheel nut (B)

(Code No. 937917Z)--------------1*5

Hex. bar wrench 6 mm

(Code No. 872422)----------------1

*1: For the U.S.A and Mexico: 5/8-11 UNC

*2: Be sure to check the nameplate on the product as it is subject to change by areas.

*3: For the U.S.A and Mexico: 6,000/min.

*4: Net weight excludes cord, side handle, depressed-center wheel, wheel nut, wheel washer and wheel

guard.

*5: Standard accessories may vary depending on market areas.

SPECIFICATIONS

-4-

(Superior specifications: )

1. Specification comparisons

Maker HITACHI

Model name G 18SS B

Capacity

Depressed-center wheel dia. (mm) 180

(7”) 180

(7”)

Power input *1(W) 1,900 2,000

Power output *1(W) 1,200 1,160

Max. power output *1(W) 3,150 2,900

No-load speed (/min) 8,500 8,500

No-load sound pressure level (dB/A) 90 91

Service life of carbon brushes *2(hr) 100 160

Weight *3(kg) 4.3 (9.48 lbs.) 4.2 (9.26 lbs.)

(Actual weight) (kg) 4.5 (9.92 lbs.) 4.4 (9.70 lbs.)

Dimensions L mm (inch) 463 (18-7/32) 458 (18-1/32)

H mm (inch) 83 (3-9/32) 92 (3-20/32)

Maker HITACHI

Model name G 23SS B

Capacity

Depressed-center wheel dia. (mm) 230

(9”) 230

(9”)

Power input *1(W) 1,900 2,000

Power output *1(W) 1,200 1,160

Max. power output *1(W) 3,150 2,900

No-load speed (/min) 6,600 6,600

No-load sound pressure level (dB/A) 90 91

Service life of carbon brushes *2(hr) 100 160

Weight *3(kg) 4.3 (9.48 lbs.) 4.2 (9.26 lbs.)

(Actual weight) (kg) 4.5 (9.92 lbs.) 4.4 (9.70 lbs.)

Dimensions L mm (inch) 463 (18-7/32) 458 (18-1/32)

H mm (inch) 83 (3-9/32) 92 (3-20/32)

*1: Depends on market.

*2: Service life of carbon brushes in the continuous rated load test

*3: Weight without cord, side handle, depressed-center wheel,

wheel nut, wheel washer and wheel guard

COMPARISONS WITH SIMILAR PRODUCTS

-5-

1. Safety instructions

In the interest of promoting the safest and most efficient use of the Models G 18SS and G 23SS Disc

Grinders by all of 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 Name Plate or Caution Plate attached to

each tool.

A. Handling instructions

Although every effort is made in each step of design, manufacture and inspection to provide protection

against safety hazards, the dangers inherent in the use of any electric power tool cannot be completely

eliminated. Accordingly, general precautions and suggestions for the use of electric power tools, and

specific precautions and suggestions for the use of the disc grinders are listed in the Handling Instructions

to enhance the safe and efficient use of the tool by the customer. Salespersons must be thoroughly familiar

with the contents of the Handling Instructions to be able to offer appropriate guidance to the customer

during sales promotion.

B. Caution on the name plate

Each tool is provided with a name plate which contains the following basic safety precautions in the use of

the tool.

CAUTION

Read thoroughly HANDLING INSTRUCTIONS before use.

C. Precautions on usage

Never press the pushing button while the depressed-center wheel is rotating.

If the pushing button is pressed while the depressed-center wheel is rotating, the spindle will stop

immediately. In such a case, there is a danger that the wheel nut may be loosened and the depressed-

center wheel may fly off unexpectedly, resulting in possible serious injury.

(1) For U.K., Germany, Belgium, France, Netherlands,Austria, Russia, Switzerland,

ain, Portu

al, Canar

Islands, Ital

, Finland, Denmark, Sweden and Norwa

(

)

For Australia

PRECAUTIONS IN SALES PROMOTION

-6-

1. Precautions in disassembly and reassembly

The [Bold] numbers in the descriptions below correspond to the numbers in the Parts List and the

exploded assembly diagram for the Models G 18SS and G 23SS.

1. Removal of the armature

(a) Loosen the Hex. Socket Hd. Bolt M8 x 25 [28] and remove the Wheel Guard Ass'y [29].

(b) Remove the Brush Caps [34] and take out the Carbon Brushes (1 Pair) [35].

taken out together with the Gear Cover Ass'y [5], Packing Gland [26] and related parts.

(d) Remove the four Hex. Socket Hd. Bolts (W/Flange) M5 x 16 [27].

(e) After removing the two Seal Lock Screws (W/Sp. Washer) M5 x 14 (Black) [1], the Armature [10] can

be extracted together with the Bearing Cover [9] and the related parts.

(f) Carefully wrap theArmature [10] with a soft, clean rag to protect it from being damaged, and clamp it

securely in a vise. Then, remove the Special Nut M10 [6] and extract the Gear and Pinion Set [33].

(g) As illustrated in Fig. 1, the Ball Bearing 6301VVCMPS2L [7] can be removed from the Armature [10]

by utilizing a J-204 bearing puller (special repair tool, Code No. 970982). After removal of the ball

bearing, the Bearing Cover [9] can be easily taken off.

Disassembl

REPAIR GUIDE

Push

Bearing puller (Code No. 970982)

Fig. 1

-7-

2. Removal of the dust seal

(a) Insert the hooks of the J-204 bearing puller between the commutator and the Dust Seal [14] from

both sides, and fix the hooks with the wing bolts.

(b) Place the J-204 bearing puller on a supporting jig and push down on the armature shaft with a hand

press to remove the Dust Seal [14] together with the Ball Bearing 6000VVCMPS2L[15]. Replace the

Dust Seal [14] with new one because it is damaged by the removal of the Ball Bearing

6000VVCMPS2L [15].

3. Removal of the stator ass'y

(a) After removing the Armature [10], disconnect the internal wires connected to the Brush Holders [36]

and the Switch [48].

(b) Loosen the two Hex. Hd. Tapping Screws D5 x 60 [12] and remove the Stator Ass'y [13] from the

Housing Ass'y [38]. If the Stator Ass'y [13] cannot be easily removed from the Housing Ass'y [38],

disassembly can be facilitated by heating the Housing Ass'y [38] to a temperature of approximately

60°C (140°F) with an appropriate heating device.

4. Removal of the gear and pinion set

(a) Loosen the four Hex. Socket Hd. Bolts (W/Flange) M5 x 16 [27] and remove the Packing Gland [26]

together with the Spindle [24] and the Gear and Pinion Set [33] from the Gear Cover Ass'y [5] in a

single body.

(b) Remove the Retaining Ring for D12 Shaft [19] from the Spindle [24].

recommended that the special repair tools described below are utilized.

Place the assembly on a sleeve that

matches the dimension of the

Packing Gland [26] and push down

on the top of the Spindle [24] with a

hand press to remove the Gear and

Pinion Set [33] as shown in Fig. 2.

Push

Fig. 2

Spindle [24]

Packing Gland [26]

Sleeve

Gear and Pinion Set [33]

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