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Hitachi G 18SE3 Technical Data And Service Manual

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DISC GRINDER
G 18SE3, G 18UA2, G 18SG2, G 18UB2,
G 23SC3, G 23UA2, G 23SE2, G 23UB2
LIST Nos. G 18SE3: E250, G 18UA2: E251,
G 18SG2: E252, G 18UB2: E253,
G 23SC3: E254, G 23UA2: E255,
G 23SE2: E256, G 23UB2: E257
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
MODELS
G 18SE3, G 18UA2, G 18SG2, G 18UB2,
G 23SC3, G 23UA2, G 23SE2, G 23UB2
POWER TOOLS
Nov. 2002
TECHNICAL DATA
AND
SERVICE MANUAL
G

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  Summary of Contents for Hitachi G 18SE3

  • Page 1 MODELS G 18SE3, G 18UA2, G 18SG2, G 18UB2, G 23SC3, G 23UA2, G 23SE2, G 23UB2 POWER TOOLS DISC GRINDER TECHNICAL DATA G 18SE3, G 18UA2, G 18SG2, G 18UB2, SERVICE MANUAL G 23SC3, G 23UA2, G 23SE2, G 23UB2 LIST Nos.
  • 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: Competitors Symbols Utilized Company Name Model Name 9047, 9047SF, 9049, 9049SF, MAKITA 9057, 9057SF, 9059, 9059SF GWS24-180, GWS24-180JB,...
  • Page 3: Table Of Contents

    8-5. Wiring Diagram ..........................18 8-6. Insulation Tests ..........................18 8-7. No-load Current Value ........................18 9. STANDARD REPAIR TIME (UNIT) SCHEDULES ............... 19 Assembly Diagram for G 18SE3 Assembly Diagram for G 18UA2 Assembly Diagram for G 18SG2 Assembly Diagram for G 18UB2...
  • Page 4: Product Name

    2200 W or more input. To correspond to the request for improved powerful products with 2200 W or more input, the Models G 18SE3, G 18UA2, G 18SG2, G 18UB2, G 23SC3, G 23UA2, G 23SE2 and G 23UB2 have been developed to upgrade and replace the current Models G 18SE2, G 18UA, G 18SG, G 18UB, G 23SC2, G 23UA, G 23SE and G 23UB.
  • Page 5: Selling Points

    200˚K using the Model G 23SC3 as the reference. As is evident from this, the Models G 18SE3, G 18UA2, G 23SC3, G 23UA2, G 18SG2, G 18UB2, G 23SE2 and G 23UB2 are superior to the competitors in overload durability.
  • Page 6: Prolonged Service Life Of The Carbon Brushes Thanks To The New Construction

    The service life of the carbon brushes is 1.5 times longer than the current models thanks to the adoption of the new carbon brush retainer construction. The service life of the carbon brushes is equivalent to that of the competitors. G 18SE3/G 18UA2/G 18SG2/G 18UB2/ G 23SC3/G 23UB2/G 23SE2/G 23UB2 G 18SE2/G 18UA/G 18SG/G 18UB/ G 23SC2/G 23UB/G 23SE/G 23UB Fig.
  • Page 7: Dust-Proof Ball Bearing Thanks To The Labyrinth Construction

    4-5. Durable Ball Bearing Retainer Thanks to the Iron Bushing The Models G 18SE3, G 18UA2, G 23SC3, G 23UA2, G 18SG2, G 18UB2, G 23SE2 and G 23UB2 are equipped with the iron bushing in the ball bearing retainer at the commutator side of the housing to improve the durability of Housing the ball bearing retainer.
  • Page 8: Wheel Guard Angle-Adjustable Without Using A Tool

    4-7. Wheel Guard Angle-Adjustable without Using a Tool By following the procedure described below once, the newly developed tool-less wheel guard can be adjusted to a desired angle without using any tool. [Installation and adjustment of the wheel guard] Set the Wheel Guard Ass'y [36] <36> (36) on the Packing Gland [27] <27> (27). With the Lever [31] <31>...
  • Page 9: Specifications

    5. SPECIFICATIONS Model G 18SE3/G 18UA2 G 23SC3/G 23UA2 Item O.D. 180 mm (7") O.D. 230 mm (9") Dimensions x Thickness 6 mm (1/4") x Thickness 6 mm (1/4") Depressed- x I.D. 22.2 mm (7/8") x I.D. 22.2 mm (7/8") center Max.
  • Page 10 Model G 18SG2/G 18UB2 G 23SE2/G 23UB2 Item O.D. 180 mm (7") O.D. 230 mm (9") Dimensions x Thickness 6 mm (1/4") x Thickness 6 mm (1/4") Depressed- x I.D. 22.2 mm (7/8") x I.D. 22.2 mm (7/8") center Max. practical wheels 80 m/s (15,800 ft/min) peripheral speed...
  • Page 11: Comparisons With Similar Products

    6. COMPARISONS WITH SIMILAR PRODUCTS 6-1. Specification Comparisons HITACHI Maker G 18SE3 G 18SE2 Model name G 18UA2 G 18UA Capacity: (7") (7") Depressed-center wheel dia. (mm) (7") 2300 2200 Power input *1 2400 1500 1450 Power output *1 1500...
  • Page 12 HITACHI Maker G 18SG2 G 18SG Model name G 18UB2 G 18UB Capacity: (7") (7") Depressed-center wheel dia. (mm) (7") 2500 2400 Power input *1 2600 1680 1530 Power output *1 1600 4600 4000 Max. power output *1 4200 8500...
  • Page 13: Practical Test Data

    6-2. Practical Test Data Comparison of temperature rise of stator coil section: The graph below shows the relationship between load and temperature rise of the stator coil. The temperature rise of the Models G 23SC3 is the lowest among the competitive models. This means that the resistance to overload usage of the Model G 23SC3 is superior to other maker's models.
  • Page 14: Precautions In Sales Promotion

    7. PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Models G 18SE3, G 18UA2, G 18SG2, G 18UB2, G 23SC3, G 23UA2, G 23SE2 and G 23UB2 Disc Grinders by all of our customers, it is very important...
  • Page 15: Precautions On Usage

    7-3. 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 so that the depressed-center wheel flies off unexpectedly to cause possible serious injury.
  • Page 16: 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 23SC3, G 23SE2, G 18SE3 and G 18SG2, and the <Bold> numbers to those in the Parts List and the exploded assembly diagram for the Models G 23UA2, G 18UA2, and G 18UB2, and the (Bold) numbers to those in the Parts List and the exploded assembly diagram for the Model G 23UB2.
  • Page 17 (2) Removal of the Dust Seal [43] <42> (43) 1. Insert the hooks of the J-204 bearing puller between the commutator and the Dust Seal [43] <42> (43) from both sides, and fix the hooks with the wing bolts. 2. 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 [43] <42>...
  • Page 18: Reassembly

    8-2. Reassembly Put the parts together in the reverse order of disassembly, with the precautions given below. (1) Generously lubricate the teeth of Gear [20] <20> (20) and Pinion [7] <7> (7) with grease. Rub grease onto the teeth with your fingers so that the grease reaches each tooth bottom. Note that under-lubricated Gear [20] <20>...
  • Page 19 Pass the internal wire of the cord through this area. Insert the terminal securely. (a) G 18SE3/G 23SC3/G 18SG2/G 23SE2 Fit the internal wire in the groove securely. Pass the internal wire of the cord through this area. Resistor ass'y...
  • Page 20: Lubrication Points And Types Of Lubricant

    The internal wire with tube of stator shall pass this groove. The internal wire of stator shall pass this area. (2 pcs.) Fig. 16 (6) Mount the cord clip as shown in Fig. 17 being careful of the direction. Cord dia.: Max. 8.5 mm dia. Cord dia.: Over 8.5 mm dia.
  • Page 21: Wiring Diagram

    8-5. Wiring Diagram (1) G 18SE3/G 23SC3 Wiring dia. G 18SG2/G 23SE2 Switch Field Coil Power Condensor Source Ass'y (0.22µF) Field Coil <For U.S.A.> Switch Field Coil Power Source Field Coil (2) G 18UA2/G 23UA2 Switch G 18UB2/G 23UB2 Field Coil Condensor Ass'y (0.22µF)
  • Page 22: Standard Repair Time (Unit) Schedules

    9. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow G 18SE3 G 18SG2 G 23SC3 Wheel Guard Ass'y G 23SE2 G 18UA2 Housing Ass'y G 18UB2 General Assembly Stator Gear Cover Pinion G 23UA2 Ass'y Armature...
  • Page 23 LIST NO. E250 ELECTRIC TOOL PARTS LIST DISC GRINDER 2002 • • Model G 18SE3 (E1)
  • Page 24 PARTS G 18SE3 ITEM CODE NO. DESCRIPTION REMARKS USED 315-636 SEAL LOCK SCREW (W/SP.WASHER) M5X14 (BLACK) 301-654 TAPPING SCREW (W/FLANGE) D5X35 306-888 PUSHING BUTTON 320-219 SPRING 320-217 GEAR COVER ASS’Y INCLUD.3,4,17,40,41 320-226 SPECIAL NUT M10 320-243 PINION 320-225 PINION FOR USA...
  • Page 25 PARTS G 18SE3 ITEM CODE NO. DESCRIPTION REMARKS USED 320-241 GEAR ASS’Y INCLUD. 7, 20 320-223 GEAR AND PINION ASS’Y INCLUD. 7, 20 FOR USA 320-216 DUST SEAL 600-0VV BALL BEARING 6000VVCMPS2L 321-536 BEARING BUSHING 321-535 HOUSING ASS’Y INCLUD. 45...
  • Page 26: Standard Accessories

    STANDARD ACCESSORIES G 18SE3 ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH 937-917Z WHEEL NUT (B) FOR AUS OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 310-337 SUPER WASHER * 602 937-960Z WHEEL GUARD FOR USA, CAN --- 4 ---...
  • Page 27 LIST NO. E251 ELECTRIC TOOL PARTS LIST DISC GRINDER 2002 • • Model G 18UA2 (E1)
  • Page 28 PARTS G 18UA2 ITEM CODE NO. DESCRIPTION REMARKS USED 315-636 SEAL LOCK SCREW (W/SP.WASHER) M5X14 (BLACK) 301-654 TAPPING SCREW (W/FLANGE) D5X35 306-888 PUSHING BUTTON 320-219 SPRING 320-217 GEAR COVER ASS’Y INCLUD. 3, 4, 17, 39, 40 320-226 SPECIAL NUT M10 320-243 PINION 320-221...
  • Page 29 PARTS G 18UA2 ITEM CODE NO. DESCRIPTION REMARKS USED HITACHI LABEL 320-233 BRUSH HOLDER 320-245 SPRING 320-236 RESISTOR 320-371 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK 320-235 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK W/LOCK FOR FRG 960-266 CORD CLIP 984-750 TAPPING SCREW (W/FLANGE) D4X16...
  • Page 30 STANDARD ACCESSORIES G 18UA2 ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-824 D. C. WHEELS 180MM A24R (25 PCS.) 310-337 SUPER WASHER --- 4 --- Printed in Japan 11 -- 02 * ALTERNATIVE PARTS (021130N)
  • Page 31 LIST NO. E252 ELECTRIC TOOL PARTS LIST DISC GRINDER 2002 • • Model G 18SG2 (E1)
  • Page 32 PARTS G 18SG2 ITEM CODE NO. DESCRIPTION REMARKS USED 315-636 SEAL LOCK SCREW (W/SP.WASHER) M5X14 (BLACK) 301-654 TAPPING SCREW (W/FLANGE) D5X35 306-888 PUSHING BUTTON 320-219 SPRING 320-217 GEAR COVER ASS’Y 1 INCLUD. 3, 4, 17, 40, 41 320-226 SPECIAL NUT M10 320-243 PINION 320-221...
  • Page 33 ITEM CODE NO. DESCRIPTION REMARKS USED 999-089 CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 320-231 HANDLE (B) HITACHI LABEL 320-233 BRUSH HOLDER 320-245 SPRING 320-238 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK 320-239 W/LOCK FOR ESP, AUT SWITCH (2P PILLAR TYPE) W/SAFETY LOCK...
  • Page 34 STANDARD ACCESSORIES G 18SG2 ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH * 502 937-917Z WHEEL NUT (B) FOR NZL OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 310-337 SUPER WASHER --- 4 --- Printed in Japan 11 -- 02 * ALTERNATIVE PARTS (021130N)
  • Page 35 LIST NO. E253 ELECTRIC TOOL PARTS LIST DISC GRINDER 2002 • • Model G 18UB2 (E1)
  • Page 36 PARTS G 18UB2 ITEM CODE NO. DESCRIPTION REMARKS USED 315-636 SEAL LOCK SCREW (W/SP.WASHER) M5X14 (BLACK) 301-654 TAPPING SCREW (W/FLANGE) D5X35 306-888 PUSHING BUTTON 320-219 SPRING 320-217 GEAR COVER ASS’Y INCLUD. 3, 4, 17, 39, 40 320-226 SPECIAL NUT M10 320-243 PINION 320-221...
  • Page 37 PARTS G 18UB2 ITEM CODE NO. DESCRIPTION REMARKS USED 320-231 HANDLE (B) HITACHI LABEL 320-233 BRUSH HOLDER 320-245 SPRING 320-236 RESISTOR 320-371 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK 320-235 1 W/LOCK FOR FRG,AUT SWITCH (2P PILLAR TYPE) W/SAFETY LOCK 960-266...
  • Page 38 STANDARD ACCESSORIES G 18UB2 ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-824 D. C. WHEELS 180MM A24R (25 PCS.) 310-337 SUPER WASHER --- 4 --- Printed in Japan 11 -- 02 * ALTERNATIVE PARTS (021130N)
  • Page 39 LIST NO. E254 ELECTRIC TOOL PARTS LIST DISC GRINDER 2002 • • Model G 23SC3 (E1)
  • Page 40 PARTS G 23SC3 ITEM CODE NO. DESCRIPTION REMARKS USED 315-636 SEAL LOCK SCREW (W/SP.WASHER) M5X14 (BLACK) 301-654 TAPPING SCREW (W/FLANGE) D5X35 306-888 PUSHING BUTTON 320-219 SPRING 320-217 GEAR COVER ASS’Y INCLUD. 3, 4, 17, 40, 41 320-226 SPECIAL NUT M10 320-225 PINION 320-221...
  • Page 41 CARBON BRUSH 7X17X22.5 (1 PAIR) 999-061 CARBON BRUSH 7X17X22.5 (1 PAIR) FOR EUROPE, SAF 999-089 FOR EUROPE, SAF CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 320-231 HANDLE (B) HITACHI LABEL 320-233 BRUSH HOLDER 320-245 SPRING 320-239 W/LOCK SWITCH (2P PILLAR TYPE) W/SAFETY LOCK 320-238...
  • Page 42 STANDARD ACCESSORIES G 23SC3 ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 310-337 SUPER WASHER 937-984Z WHEEL GUARD FOR USA, CAN --- 4 --- Printed in Japan 11 -- 02 * ALTERNATIVE PARTS (021130N)
  • Page 43 LIST NO. E255 ELECTRIC TOOL PARTS LIST DISC GRINDER 2002 • • Model G 23UA2 (E1)
  • Page 44 PARTS G 23UA2 ITEM CODE NO. DESCRIPTION REMARKS USED 315-636 SEAL LOCK SCREW (W/SP.WASHER) M5X14 (BLACK) 301-654 TAPPING SCREW (W/FLANGE) D5X35 306-888 PUSHING BUTTON 320-219 SPRING 320-217 GEAR COVER ASS’Y 1 INCLUD. 3, 4, 17, 39, 40 320-226 SPECIAL NUT M10 320-225 PINION 320-221...
  • Page 45 PARTS G 23UA2 ITEM CODE NO. DESCRIPTION REMARKS USED 320-231 HANDLE (B) HITACHI LABEL 320-233 BRUSH HOLDER 320-245 SPRING 320-236 RESISTOR 320-235 W/LOCK SWITCH (2P PILLAR TYPE) W/SAFETY LOCK 320-371 FOR HOL SWITCH (2P PILLAR TYPE) W/SAFETY LOCK 960-266 CORD CLIP...
  • Page 46 STANDARD ACCESSORIES G 23UA2 ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-825 D. C. WHEELS 230MM A24R (25 PCS.) 310-337 SUPER WASHER --- 4 --- Printed in Japan 11 -- 02 * ALTERNATIVE PARTS (021130N)
  • Page 47 LIST NO. E256 ELECTRIC TOOL PARTS LIST DISC GRINDER 2002 • • Model G 23SE2 (E1)
  • Page 48 PARTS G 23SE2 ITEM CODE NO. DESCRIPTION REMARKS USED 315-636 SEAL LOCK SCREW (W/SP.WASHER) M5X14 (BLACK) 301-654 TAPPING SCREW (W/FLANGE) D5X35 306-888 PUSHING BUTTON 320-219 SPRING 320-217 GEAR COVER ASS’Y INCLUD. 3, 4, 17, 40, 41 320-226 SPECIAL NUT M10 320-225 PINION 320-221...
  • Page 49 FOR NZL, FRA, HOL, ITA, FRG, BEL, AUT, ESP 999-089 CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) FOR NZL, FRA, HOL, ITA, FRG, BEL, AUT, ESP 320-231 HANDLE (B) HITACHI LABEL 320-233 BRUSH HOLDER 320-245 SPRING 320-238 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK...
  • Page 50 STANDARD ACCESSORIES G 23SE2 ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH * 502 937-917Z WHEEL NUT (B) FOR AUS, NZL OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 310-337 SUPER WASHER --- 4 --- Printed in Japan 11 -- 02 * ALTERNATIVE PARTS (021130N)
  • Page 51 LIST NO. E257 ELECTRIC TOOL PARTS LIST DISC GRINDER 2002 • • Model G 23UB2 (E1)
  • Page 52 PARTS G 23UB2 ITEM CODE NO. DESCRIPTION REMARKS USED 315-636 SEAL LOCK SCREW (W/SP.WASHER) M5X14 (BLACK) 301-654 TAPPING SCREW (W/FLANGE) D5X35 306-888 PUSHING BUTTON 320-219 SPRING 320-217 GEAR COVER ASS’Y INCLUD. 3, 4, 17, 40, 41 320-226 SPECIAL NUT M10 320-225 PINION 320-221...
  • Page 53 CARBON BRUSH 7X17X22.5 (1 PAIR) 999-089 CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 999-061 CARBON BRUSH 7X17X22.5 (1 PAIR) FOR AUS, GBR, NOR, FIN 320-231 HANDLE (B) HITACHI LABEL 320-233 BRUSH HOLDER 320-245 SPRING 320-236 RESISTOR 320-371 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK...
  • Page 54 STANDARD ACCESSORIES G 23UB2 ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH * 502 937-917Z WHEEL NUT (B) FOR AUS OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 310-337 SUPER WASHER --- 4 --- Printed in Japan 11 -- 02 * ALTERNATIVE PARTS (021130N)

This manual is also suitable for:

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