Hitachi SP 18SA User manual

POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
POLISHER
SP 18SA
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No. 0351 Sep. 1999
S
MODELS
SP 18SA

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:
Symbol Utilized Competitor
Company Name Model Name
MAKITA 9218 PB
C

Page
CONTENTS
1. PRODUCTS NAME ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
2. MARKETING OBJECTIVE •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
3. APPLICATIONS •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
4. SELLING POINTS ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
4-1. Selling Point Descriptions ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 2
5. SPECIFICATIONS ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 4
6. COMPARISONS WITH SIMILAR PRODUCTS •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 5
6-1. Specification Comparisons ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 5
6-2. Practical Test Data ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 6
7. PRECAUTIONS IN SALES PROMOTION ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 6
7-1. Handling Instructions ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 6
7-2. Cautions on Name Plate •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 7
7-3. Precautions on Usage ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 7
8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 8
8-1. Disassembly of the Armature Ass'y and the Lock LeverAss'y ••••••••••••••••••••••••••••••••••••••••••••••••••• 8
8-2. Disassembly of the Stator Ass'y •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 9
8-3. Disassembly of the Final Gear and the Ball Bearing ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 9
8-4. Reassembly •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 10
8-5. Tightening Torque •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 10
8-6. Wiring Diagrams •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 10
8-7. Insulation Tests •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 11
8-8. No-Load Current Values ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 11
9. STANDARD REPAIR TIME (UNIT) SCHEDULES •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 12
[ Appendix ]
Assembly Diagram for SP 18SA •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 13

--- 1 ---
1. PRODUCTS NAME
Hitachi Polisher, Model SP 18SA [180 mm (7")]
2. MARKETING OBJECTIVE
The Model SP 18SA is a high-power and double-insulated electric polisher with a stand-up design specially
developed to meet customer demands in European, North American and Asian markets.
This polisher will make it possible to exploit new markets because it is the first product in our polisher line to
satisfy this range of damands.
The Model SP 18SA has the following features.
1) High-power motor
2) Convenient spindle lock
3) Dust-proof bearing-chamber
3. APPLICATIONS
•Polishing or shining painted metal surfaces, such as those of automobiles, trains, elevators, refrigerators,
sewing machines, washing machines, metal appliances, etc.
•Polishing varnished surfaces of wooden furniture, etc.
•Shining synthetic resin or ebonite products.
4. SELLING POINTS
New dust seal
Efficiently prevents dust from
entering the ball bearing on the
commutator side
High-power motor
Max. output:
220 --- 230 V: 910 W (1.2 hp)
110 --- 115 V: 760 W (1.0 hp)
Convenient spindle
lock

--- 2 ---
Max. output *1(W) 910 (1.22 hp) 640 (0.86 hp)
Actual product weight *2(kg) 3.08 (6.79 lbs) 2.95 (6.50 lbs)
Max. output/product weight (W/kg) 295 (0.18 hp/lb) 217 (0.13 hp/lb)
HITACHI C
SP 18SA
4-1. Selling Point Descriptions
1) High-power motor
The Model SP 18SAis equipped with a high-power motor and is more powerful than similar products. We
could say that the ratio of the motor's maximum output to the product weight defines its performance.
Compared with a typical competitor's model C in terms of this indicator, the Model SP 18SA proves to have
higher performance as shown in Table 1.
Table 1 Comparison of max. output and product weight (220 --- 230 V)
Maker
Model
Item
*1Max. output may vary depending on the market
*2Actual product weight is a measured weight and excludes cord.
(Maximum output may vary depending on market area.)
Tighten
Push
Loosen
Lock lever
Wrench
Fig. 1
2) Convenient spindle lock
The Model SP 18SA is the first polisher in the polisher industry equipped with a convenient spindle-lock
mechanism. Thanks to this mechanism, tools can be easily replaced as shown in Fig. 1.

--- 3 ---
Fig. 2
Labyrinth grooves Labyrinth grooves
2 mm 6.5 mm
CHITACHI
SP 18SA
3) New dust seal
Newly-designed dust seals are adopted in the bearing chamber on the commutator side.
This ensures better dust-resistance of the ball bearing in comparison with C.
The key features of the new dust seal are as follows.
(1) Width is increased to 6.5 mm (C: 2 mm)
(2) 2-step side construction is provided and each step has labyrinth grooves.

--- 4 ---
5. SPECIFICATIONS
Item Model SP 18SA
180 mm (7")
AC single phase 50 or 60 Hz
*1Weight excludes cord.
*2The standard accessories differ in some areas.
Capacity
Power source
Voltage, current and
power input
Rotation speed (no-load)
Type of motor
Type of switch
Enclosure
Catalog Net *1
Weight Actual Net *1
Gross
Packaging
Standard accessories *2
2,000 /min
AC single-phase commutator motor
Trigger switch
Material: Housing
Handle cover •••••Glassfiber reinforced polyamide resin (green)
Tale cover
Gear cover •••••Aluminum alloy die casting
Inner cover
Painting: Gear cover •••••Metallic silver
Inner cover
2.9 kg (6.4 lbs)
3.1 kg (6.8 lbs)
3.8 kg (8.4 lbs)
Corrugated cardboard box
Rubber pad 180 mm (7") ••••••••••••••••••••••••••••••••••• 1
Wool bonnet 180 mm (7") •••••••••••••••••••••••••••••••••• 1
Side handle •••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Wrench •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Voltage (V) Current (A) Power input (W)
110 6.3
115 6.0 650
220 3.1
230 3.0

--- 5 ---
Maker HITACHI C
Model SP 18SA
Capacity mm 180 (7") 180 (7")
Power input W 650 570
Power output W 390 (0.5 hp) 370 (0.5 hp)
Max. power output ( 220 --- 230 V / 115 --- 110 V ) W 910 (1.2 hp) / 760 (1.0 hp) 640 (0.9 hp) / 530 (0.7 hp)
No-load speed /min 2,000 2,000
No-load noise level dB/A 84 82
Spindle lock Equipped NA *1
Catalog 2.9 (6.4 lbs) 2.9 (6.4 lbs)
Weight *2Actual kg 3.1 (6.8 lbs) 3.0 (6.6 lbs)
Catalog H mm 240 (9-7/16") 235 (9-1/4")
H 243 (9-9/16") 237 (9-5/16")
Dimensions Actual L mm 237 (9-11/32") 236 (9-1/4")
W 105 (4-1/8") 98 (3-27/32")
6. COMPARISONS WITH SIMILAR PRODUCTS
6-1. Specification Comparisons
WL
H
*1NA: Not applicable
*2Weight without cord

--- 6 ---
6-2. Practical Test Data
1) Comparisons in torque vs. rotation speed and stator coil temp. rise
The graph below shows the relationship between the rotation speed and the stator coil temperature rise while
varying loads.
The rotation speed of the Model SP 18SA is higher than that of similar product C.
This means that the efficiency of the Model SP 18SA is superior to similar product C.
HITACHI
SP 18SA
Stator coil tamp. rise
: Burn-out point
Load
HITACHI
SP 18SA
Rotation speed of spindle
Rotation speed of spindle (/min)
Stator coil temp. rise (K)
C
C
0
500
1000
0
200
400
1500
2000
2500
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Model SP 18SA Polisher 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 attached to each tool.
7-1. 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 the polisher is listed in the Handling Instructions
to enhance the safe, 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.

--- 7 ---
7-2. Cautions on Name Plate
The following basic precautions are listed on the Name Plate attached to the main body of each tool.
7-3. Precautions on Usage
Never press the lock lever while the spindle is rotating:
If the lock lever is pressed while the spindle is rotating, the spindle will stop immediately. In such a case, there is
a danger that the wheel washer may be loosened so that the rubber pad and wool bonnet fly off unexpectedly to
cause possible serious injury.
(1) For Taiwan
-- WARNING --
To reduce the risk of injury, the user must read and understand instruction manual.
AVERTISSEMENT
Afin de rèduire le risque de blessures, l'utilisateur doit lire et bien comprendre le
mode d'emploi.
(1) For the U.S.A. and Canada
CAUTION
Read thoroughly HANDLING INSTRUCTIONS before use.
(1) For China

--- 8 ---
8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY
The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded
assembly diagram for SP 18SA.
8-1. Disassembly of the Armature Ass'y and the Lock Lever Ass'y
(1) Loosen the two Brush Caps [27], and take out the Carbon Brushes [26].
(2) Remove the four Tapping Screws D5 x 55 [7], and remove the Gear Cover [8], and related parts.
The Armature Ass'y [17] can then be taken out together with the Inner Cover [12], the Lock Lever [14] , and
related parts.
(3) As illustrated in Fig. 3, the Inner Cover [12], and related parts can be removed from the Armature Ass'y [17],
and related parts by utilizing a J-130 sleeve (special repair tool, Code No. 970907) and a J-131 plate (special
repair tool, Code No. 305711).
(4) The Ball Bearing [13] can be removed from theArmature Ass'y [17] by utilizing the J-30 bearing puller ass'y
(special repair tool, Code No. 970804).
After the Ball Bearing has been removed, the Lock Lever [14] can be easily taken off.
(5) As illustrated in Fig. 4, the Ball Bearing [19] can also be removed from the Armature Ass'y [17] by utilizing the
J-130 sleeve (special repair tool, Code No. 970907) and a J-204 bearing puller (special repair tool, Code No.
970982).
After the Ball Bearing has been removed, the Dust Seal [18] can be easily taken out.
Push Push the rear of the
armature shaft
J-131 plate
(Code No. 305711)
J-130 sleeve
(Code No. 970907) J-130 sleeve
(Code No. 970907)
J-204 bearing puller
(Code No. 970982)
Fig.3 Fig.4

--- 9 ---
8-2. Disassembly of the Stator Ass'y
(1) After taking off the Armature Ass'y [17], loosen the five Tapping Screws D4 X 20 [30] and remove the Tail
Cover [29], the Handle Cover [33] and the Fan Guide [20].
(2) Disconnect the lead wires of the Stator Ass'y [21] from Switch (C) [37].
Then, disconnect the lead wires of Noise Suppressor [34].
(3) Disconnect the Brush Terminals [22] from the Brush Holders [25].
(4) Loosen the two Hex. Hd. Tapping Screws [31], and remove the lead wire of the Noise Suppressor [34].
And pull out the lead wires of the Stator Ass'y [21] from the Housing Ass'y [23]. Then, the Stator Ass'y can be
taken out of the Housing Ass'y [23]. If the Stator Ass'y [21] cannot be easily taken out of the Housing Ass'y
[23], disassembly can be facilitated by heating the Housing Ass'y to a temperature of approximately 60 ˚C
(140 ˚F) in an appropriate heating oven.
8-3. Disassembly of the Final Gear and the Ball Bearing
(1) Loosen the four Tapping Screws D5 x 55 [7], and remove the Gear Cover [8], together with the Spindle [4], the
Final Gear [16], and the related parts as a single unit. Then, the Second Pinion [10] and Washer [11] can be
removed easily.
(2) Remove the Bearing Caps [3] with the J-21 wrench.
(3) As illustrated in Fig. 5, support the tip of the Gear Cover [8] with a cylindrical jig of inside diameter 35 mm or
more, and push the rear portion of the Spindle [4]. At this time, the Final Gear [16] will come off of the
Spindle.
(4) Remove the D12 Retaining Ring [6] from the Spindle [4], and the Ball Bearing [5] can be removed from the
Spindle [4] with the J-30 bearing puller ass'y (special repair tool, Code No. 970804).
Push
Cylindrical jig
35 mm dia.
Fig. 5

--- 10 ---
8-4. Reassembly
Perform reassembly in the reverse order of disassembly while ovserving the given precautions and taking care of
the following points.
(1) After disassembly, thoroughly remove old grease from the inside of the Gear Cover [8], and insert 30 g of new
grease (Nippeco JF-375, Code No. 930036, is recommended) prior to reassembly. When inserting grease,
apply it to the pinion gear teeth surfaces, and to the needle bearing inside the Inner Cover [12].
(2) When replacing the Ball Bearing [19] on the commutator side of the Armature Ass'y [17], be very careful to
ensure that the Dust Seal [18] is assembled in the proper direction. The Dust Seal [18] plays an important
role in protecting the ball bearing against dust, and must be replaced with a new one if disassembled.
8-5. Tightening Torque
D4 Tapping Screw (W/Flange) [30] [41] •••••••••••••••••••••••••••••••• 2.0 0.5 N•m (20 5 kgf •cm, 1.5 0.4 ft-lbs)
D5 Tapping Screw [7] •••••••••••••••••••••••••••••••••••••••• 2.9 0.5 N •m (30 5 kgf•cm, 2.2 0.4 ft-lbs)
D5 Hex. Hd. Tapping Screw [31]
8-6. Wiring Diagrams
For the U.S.A., Canada and Asian countries (except China)
Armature
Ass'y [17]
White or blue
Stator Ass'y [21] Yellow
Switch (C) [37]
Cord [44]
Black or brown
White or blue
43
21
For European countries and China
Armature
Ass'y [17]
Blue
Stator Ass'y [21] Yellow
Switch (C) [37]
Cord [44]
Brown
Blue43
21
Noise
Suppressor [34]
Black
Black
Silver
Choke coil

--- 11 ---
8-7. Insulation Tests
On completion of reassembly after repair, measure the insulation resistance and conduct the dielectric strength
test.
Insulation resistance: 7 MΩor more with DC 500V Megohm Tester
Dielectric strength: AC 4,000 V for 1 minute, with no abnormalities •••••••••••••• 220 V ---230 V
AC 2,500 V for 1 minute, with no abnormalities •••••••••••••• 110 V ---127 V
8-8. No-Load Current Values
After no-load operation for 30 minutes, the no-load current value should be as follows.
Voltage (V)
Current (A) max.
110 115 220 230
2.5 2.6 1.5 1.5

--- 12 ---
9. STANDARD REPAIR TIME (UNIT) SCHEDULES
MODEL 10 20 30 40 50 60 min.
Fixed Variable
SP 18SA Work Flow
Switch
Cord Housing
Stator
Armature
Ball Bearing
(6000DD)
Ball Bearing
(608VV)
Dust Seal
Inner Cover
General Assembly
Gear Cover
First Gear
Ball Bearing
(6201DD)
Spindle
Bearing Cap
Ball Bearing
(608VV)
Second Pinion
Final Gear

--- 13 ---
Assembly Diagram for SP 18SA

--- 14 ---
PARTS
SP 18SA
: ALTERNATIVE PARTS
ITEM
NO. CODE NO. DESCRIPTION NO.
USED
REMARKS
* 1 953-381 WASHER NUT 1
* 1 953-246Z WASHER NUT M14 1 FOR ITA,ESP
* 1 953-254P WASHER NUT 5/8"-11UNC 1 FOR USA
* 2 953-255 RUBBER PAD (D16 HOLE) 1 FOR INA,SIN,HKG,USA,CHN
* 2 953-247Z RUBBER PAD (D14 HOLE) 1 FOR ITA,ESP
3 944-005 BEARING CAP 1
* 4 317-910 SPINDLE 1
* 4 317-908 SPINDLE 1 FOR ITA,ESP
* 4 317-909 SPINDLE 1 FOR USA
5 620-1DD BALL BEARING 6201DDCMPS2L 1
6 939-542 RETAINING RING FOR D12 SHAFT (10 PCS.) 1
7 309-778 TAPPING SCREW (W/FLANGE) D5X55 (BLACK) 4
8 318-016 GEAR COVER 1
9 608-VVM BALL BEARING 608VVC2PS2L 1
10 317-905 SECOND PINION 1
11 317-906 WASHER 1
12 317-904 INNER COVER 1
13 600-0DD BALL BEARING 6000DDCMPS2L 1
14 317-890 LOCK LEVER 1
15 CAP 1
16 317-907 FINAL GEAR 1
* 17 360-502U ARMATURE ASS’Y 110V-115V 1 INCLUD.13,18,19
* 17 360-502E ARMATURE 220V-230V 1
18 317-889 DUST SEAL 1
19 608-VVM BALL BEARING 608VVC2PS2L 1
20 317-888 FAN GUIDE 1
* 21 340-449C STATOR ASS’Y 110V-115V 1 INCLUD.22
* 21 340-449H STATOR ASS’Y 220V-230V 1 INCLUD.22
* 21 340-449E STATOR ASS’Y 220V-230V 1 INCLUD.22 FOR INA,SIN,HKG
22 930-703 BRUSH TERMINAL 2
23 317-896 HOUSING ASS’Y 1 INCLUD.25,28
24 NAME PLATE 1
25 958-900 BRUSH HOLDER 2
26 999-043 CARBON BRUSH (1 PAIR) 2
27 945-161 BRUSH CAP 2
28 938-477 HEX. SOCKET SET SCREW M5X8 2
29 317-894 TAIL COVER 1
30 302-086 TAPPING SCREW (W/FLANGE) D4X20 (BLACK) 5
31 953-174 HEX. HD. TAPPING SCREW D5X55 2
32 937-981 SIDE HANDLE FOR M14 1
33 317-892 HANDLE COVER 1
* 34 994-273 NOISE SUPPRESSOR 1 FOR ITA,ESP,CHN
* 35 311-741 TERMINAL 2 FOR NOISE SUPPRESSOR
* 36 959-144 TERMINAL 50051 (10 PCS.) 1 FOR NOISE SUPPRESSOR
37 302-477 SWITCH (C) (1P SCREW TYPE) W/LOCK 1
38 HITACHI LABEL 1
39 317-893 DUST PACKING 1
40 980-063 TERMINAL 2 FOR CORD
41 984-750 TAPPING SCREW (W/FLANGE) D4X16 2
42 960-266 CORD CLIP 1
* 43 953-327 CORD ARMOR D8.8 1
*5
----
99

--- 15 ---
PARTS
SP 18SA
ITEM
NO. CODE NO. DESCRIPTION NO.
USED
REMARKS
* 43 938-051 CORD ARMOR D10.1 1
* 44 500-234Z CORD 1 (CORD ARMOR D8.8)
* 44 930-051 CORD 1 (CORD ARMOR D10.1) FOR TPE
* 44 500-455Z CORD 1 (CORD ARMOR D8.8) FOR CHN
* 44 500-423Z CORD 1 (CORD ARMOR D8.8) FOR SIN
* 44 500-237Z CORD 1 (CORD ARMOR D8.8) FOR HKG
* 44 500-240Z CORD 1 (CORD ARMOR D8.8) FOR USA
: ALTERNATIVE PARTS
*
5
----
99

--- 16 ---
: ALTERNATIVE PARTS
*
STANDARD ACCESSORIES
SP 18SA
ITEM
NO. CODE NO. DESCRIPTION NO.
USED
REMARKS
* 501 937-913Z WRENCH 1 FOR INA,SIN,HKG,ITA,ESP,USA,CHN
502 949-103 WOOL BONNET 180MM 1
5
----
99
Printed in Japan
(990510 N)
OPTIONAL ACCESSORIES
ITEM
NO. CODE NO. DESCRIPTION NO. USED
REMARKS
601 949-103 WOOL BONNET 180MM 1