Hitachi G 18SCY Technical Data And Service Manual
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Hitachi G 18SCY Technical Data And Service Manual

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DISC GRINDER
G 18SCY, G 18UAY, G 18SEY, G 18UBY,
G 23SCY, G 23UAY, G 23SEY, G 23UBY
LIST Nos. G 18SCY: E283, G 18UAY: E285,
G 18SEY: E284, G 18UBY: E286,
G 23SCY: E279, G 23UAY: E281,
G 23SEY: E280, G 23UBY: E282
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
MODELS
G 18SCY, G 18UAY, G 18SEY, G 18UBY,
G 23SCY, G 23UAY, G 23SEY, G 23UBY
Hitachi
Power Tools
Oct. 2006
TECHNICAL DATA
AND
SERVICE MANUAL
G

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Summary of Contents for Hitachi G 18SCY

  • Page 1 MODELS G 18SCY, G 18UAY, G 18SEY, G 18UBY, G 23SCY, G 23UAY, G 23SEY, G 23UBY Hitachi Power Tools DISC GRINDER TECHNICAL DATA G 18SCY, G 18UAY, G 18SEY, G 18UBY, SERVICE MANUAL G 23SCY, G 23UAY, G 23SEY, G 23UBY 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 GWS24-180JBV, GWS24-230JBV, BOSCH GWS26-180JBV, GWS26-230JBV...

  • 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 18SCY Assembly Diagram for G 18UAY Assembly Diagram for G 18SEY Assembly Diagram for G 18UBY...

  • Page 4: Product Name

    EU Physical Agents (Vibration) Directive (enforced in July 2005) in European markets. To meet the demand, we introduce the new 180/230 mm disc grinders Models G 18SCY, G 18SEY, G 23SCY and G 23SEY. They are low-vibration disc grinders thanks to the vibration-absorbing side handle and main handle (switch handle). In addition, we introduce the new 180/230 mm disc grinders Models G 18UAY, G 18UBY, G 23UAY and G 23UBY equipped with the soft-start function.

  • Page 5: Selling Points

    Figure 1 (a) shows the result of vibration test Moving joint mechanism performed according to EN-50144 (Single axis vibration). G 18SCY/G 18SEY 30% reduction G 18UAY/G 18UBY G 23SCY/G 23SEY...

  • Page 6: Prolonged Service Life Of The Carbon Brushes Thanks To The New Construction

    Figure 2 shows the result of vibration test performed according to EN-60745 (Tri-axial vibration). G 18SCY/G 18SEY G 18UAY/G 18UBY G 23SCY/G 23SEY G 23UAY/G 23UBY Side handle G 18SE2/G 18SG2 Switch handle G 18UA2/G 18UB2 G 23SC3/G 23SE2 G 23UA2/G 23UB2 Tri-axial vibration ratio (%) Fig.

  • Page 7: Class-Top Overload Durability

    Spindle Coupling damper Gear Ave. 1.8 Ave. 2.0 60% reduction Ave. 0.7 G 18SCY/G 18SEY G 18SE2/G 18SG2 Coupling G 18UAY/G 18UBY G 18UA2/G 18UB2 G 23SC3/G 23SE2 G 23SCY/G 23SEY G 23UAY/G 23UBY G 23UA2/G 23UB2 Fig. 4 4-4. Class-top Overload Durability The stator coil of the G 23SCY series is divided into two parts in order to make the surface area of the the stator coil 1.5 times larger than the conventional models for better cooling efficiency.

  • Page 8: Soft Grip Handle

    4-5. Soft Grip Handle The double-layer molded handle consists of a nylon resin base covered with a soft plastic layer to ensure a soft touch and firm, non-slip grip of the handles. 4-6. 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.

  • Page 9: Specifications

    5. SPECIFICATIONS Model G 18SCY/G 18UAY G 23SCY/G 23UAY Item O.D. 180 mm (7") O.D. 230 mm (9") Dimensions x Thickness 6 mm (1/4") x Thickness 6 mm (1/4") x I.D. 22.2 mm (7/8") x I.D. 22.2 mm (7/8") Depressed- Max.
  • Page 10 Model G 18SEY/G 18UBY G 23SEY/G 23UBY Item O.D. 180 mm (7") O.D. 230 mm (9") Dimensions x Thickness 6 mm (1/4") x Thickness 6 mm (1/4") x I.D. 22.2 mm (7/8") x I.D. 22.2 mm (7/8") Depressed- Max. practical center 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 Maker HITACHI G 18SCY G 18SE3 Model name G 18UAY G 18UA2 Capacity: (7") (7") (7") Depressed-center wheel dia. (mm) 2,400 2,300 2,400 Power input * 1,550 1,500 1,420 Power output *...
  • Page 12 Maker HITACHI G 18SEY G 18SG2 Model name G 18UBY G 18UB2 Capacity: (7") (7") (7") Depressed-center wheel dia. (mm) 2,600 2,500 2,600 Power input * 1,710 1,680 1,600 Power output * 4,600 4,600 4,100 Max. power output * 8,500...

  • 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 Model G 23SCY is the lowest among the competitive models. This means that the resistance to overload usage of the Model G 23SCY 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 18SCY, G 18UAY, G 18SEY, G 18UBY, G 23SCY, G 23UAY, G 23SEY and G 23UBY 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 23SCY, G 23SEY, G 18SCY AND G 18SEY, and the <Bold> numbers to those in the Parts List and the exploded assembly diagram for the Models G 23UAY, G 18UAY, G 18UBY and G 23UBY.
  • Page 17 (2) Removal of the Dust Seal [44] <44> 1. Insert the hooks of the J-204 bearing puller between the commutator and the Dust Seal [44] <44> 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 [44] <44>...

  • 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 the Gear and Pinion Set [20] <20> with grease. Rub grease onto the teeth with your fingers so that the grease reaches each tooth bottom. Note that under-lubricated Gear and Pinion Set [20] <20>...
  • Page 19 Pass the internal wire of the cord through this area. Fit the internal wire in the groove securely. (a) Models G 18SCY/G 23SCY/G 18SEY/G 23SEY Fit the internal wire in Insert the terminal securely. the groove securely. Insert the terminal securely.

  • Page 20: Lubrication Points And Types Of Lubricant

    The internal wire of stator shall pass this groove. The internal wire of stator shall pass this groove. Fig. 16 (6) Mount the cord clip as shown in Fig. 17 being careful of the direction. The internal wire with tube of stator shall pass this groove. Cord dia.: Over 8.5 mm dia.

  • Page 21: Wiring Diagram

    8-5. Wiring Diagram (1) Models G 18SCY/G 23SCY/G 18SEY/G 23SEY Wiring dia. <For the U.S.A.> (2) Models G 18UAY/G 23UAY/G 18UBY/G 23UBY Fig. 18 8-6. Insulation Tests On completion of disassembly and repair, measure the insulation resistance, and conduct the dielectric strength test.

  • Page 22: Standard Repair Time (Unit) Schedules

    9. STANDARD REPAIR TIME (UNIT) SCHEDULES Variable 60 min. MODEL Fixed Work Flow G 18SCY G 18UAY G 18SEY Wheel Guard G 18UBY Ass'y G 23SCY G 23UAY Housing G 23SEY Stator General Assembly G 23UBY Gear Cover Pinion Ass'y...
  • Page 23 Hitachi Power Tools LIST NO. E283 ELECTRIC TOOL PARTS LIST DISC GRINDER 2006 • • Model G 18SCY (E1)
  • Page 24 PARTS G 18SCY ITEM CODE NO. DESCRIPTION REMARKS USED 984-509 SEAL LOCK HEX. SOCKET HD. BOLT M5X14 323-209 TAPPING SCREW (W/FLANGE) D5X35 (BLACK) 306-888 PUSHING BUTTON 320-219 SPRING 326-717 GEAR COVER ASS’Y INCLUD. 3, 4, 16, 18, 19 320-226 SPECIAL NUT M10...
  • Page 25 PARTS G 18SCY ITEM CODE NO. REMARKS DESCRIPTION USED 937-923P WHEEL NUT 5/8”-11UNC FOR USA, CAN 937-917Z WHEEL NUT (B) FOR AUS 320-216 DUST SEAL 600-0VV BALL BEARING 6000VVCMPS2L 321-536 BEARING BUSHING 326-712 HOUSING ASS’Y INCLUD. 46 326-716 BRUSH COVER...

  • Page 26: Standard Accessories

    STANDARD ACCESSORIES G 18SCY ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH 937-907Z WHEEL WASHER (A) 937-917Z WHEEL NUT (B) FOR AUS OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-824 D. C. WHEELS 180MM A24R (25 PCS.) 310-337 SUPER WASHER...
  • Page 27 Hitachi Power Tools LIST NO. E285 ELECTRIC TOOL PARTS LIST DISC GRINDER 2006 • • Model G 18UAY (E1)
  • Page 28 PARTS G 18UAY ITEM CODE NO. DESCRIPTION REMARKS USED 984-509 SEAL LOCK HEX. SOCKET HD. BOLT M5X14 323-209 TAPPING SCREW (W/FLANGE) D5X35 (BLACK) 4 306-888 PUSHING BUTTON 320-219 SPRING 326-717 GEAR COVER ASS’Y INCLUD. 3, 4, 16, 18, 19 320-226 SPECIAL NUT M10 320-221 SEAL WASHER...
  • Page 29 ITEM CODE NO. REMARKS DESCRIPTION USED 999-089 CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 322-323 BRUSH HOLDER SET 326-716 BRUSH COVER HITACHI LABEL NAME PLATE 326-724 O-RING 326-725 O-RING 320-236 RESISTOR 320-235 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK 326-714 HANDLE (B)
  • Page 30 STANDARD ACCESSORIES G 18UAY 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 323-993 PIPE HANDLE SET INCLUD. 604 985-597 BOLT M14 FOR PIPE HANDLE --- 4 --- Printed in Japan...
  • Page 31 Hitachi Power Tools LIST NO. E284 ELECTRIC TOOL PARTS LIST DISC GRINDER 2006 • • Model G 18SEY (E1)
  • Page 32 PARTS G 18SEY ITEM CODE NO. DESCRIPTION REMARKS USED 984-509 SEAL LOCK HEX. SOCKET HD. BOLT M5X14 323-209 TAPPING SCREW (W/FLANGE) D5X35 (BLACK) 306-888 PUSHING BUTTON 320-219 SPRING 326-717 GEAR COVER ASS’Y INCLUD. 3, 4, 16, 18, 19 320-226 SPECIAL NUT M10 320-221 SEAL WASHER 320-222...
  • Page 33 TAPPING SCREW (W/FLANGE) D4X16 (BLACK) 999-061 CARBON BRUSH 7X17X22.5 (1 PAIR) 999-089 CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 322-323 BRUSH HOLDER SET 326-716 BRUSH COVER HITACHI LABEL NAME PLATE 326-724 O-RING 326-725 O-RING 320-238 OFF/LOCK SWITCH (2P PILLAR TYPE) W/SAFETY LOCK...
  • Page 34 STANDARD ACCESSORIES G 18SEY ITEM CODE NO. DESCRIPTION REMARKS USED 937-913Z WRENCH 937-907Z WHEEL WASHER (A) 937-917Z WHEEL NUT (B) FOR NZL OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-824 D. C. WHEELS 180MM A24R (25 PCS.) 310-337 SUPER WASHER 323-993 PIPE HANDLE SET INCLUD.
  • Page 35 Hitachi Power Tools LIST NO. E286 ELECTRIC TOOL PARTS LIST DISC GRINDER 2006 • • Model G 18UBY (E1)
  • Page 36 PARTS G 18UBY ITEM CODE NO. DESCRIPTION REMARKS USED 984-509 SEAL LOCK HEX. SOCKET HD. BOLT M5X14 323-209 TAPPING SCREW (W/FLANGE) D5X35 (BLACK) 306-888 PUSHING BUTTON 320-219 SPRING 326-717 GEAR COVER ASS’Y INCLUD. 3, 4, 16, 18, 19 320-226 SPECIAL NUT M10 320-221 SEAL WASHER 320-222...
  • Page 37 ITEM CODE NO. REMARKS DESCRIPTION USED 999-089 CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 322-323 BRUSH HOLDER SET 326-716 BRUSH COVER HITACHI LABEL NAME PLATE 326-724 O-RING 326-725 O-RING 320-236 RESISTOR 320-371 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK FOR HOL...
  • Page 38 STANDARD ACCESSORIES G 18UBY 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 323-993 PIPE HANDLE SET INCLUD. 604 985-597 BOLT M14 FOR PIPE HANDLE --- 4 --- Printed in Japan...
  • Page 39 Hitachi Power Tools LIST NO. E279 ELECTRIC TOOL PARTS LIST DISC GRINDER 2006 • • Model G 23SCY (E1)
  • Page 40 PARTS G 23SCY ITEM CODE NO. DESCRIPTION REMARKS USED 984-509 SEAL LOCK HEX. SOCKET HD. BOLT M5X14 323-209 TAPPING SCREW (W/FLANGE) D5X35 (BLACK) 306-888 PUSHING BUTTON 320-219 SPRING 326-717 GEAR COVER ASS’Y INCLUD. 3, 4, 16, 18, 19 320-226 SPECIAL NUT M10 320-221 SEAL WASHER 320-222...
  • Page 41 FOR FRA, HOL, ITA, FRG, ESP, BEL, AUT 999-089 FOR FRA, HOL, ITA, FRG, ESP, BEL, AUT CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 322-323 BRUSH HOLDER SET 326-715 BRUSH COVER HITACHI LABEL NAME PLATE 326-724 O-RING 326-725 O-RING 320-238 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK...
  • Page 42 STANDARD ACCESSORIES G 23SCY ITEM CODE NO. DESCRIPTION REMARKS USED 325-491 WRENCH 326-175 CASE FOR FRA, BEL OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-825 D. C. WHEELS 230MM A24R (25 PCS.) 310-337 SUPER WASHER 323-993 PIPE HANDLE SET INCLUD.
  • Page 43 Hitachi Power Tools LIST NO. E281 ELECTRIC TOOL PARTS LIST DISC GRINDER 2006 • • Model G 23UAY (E1)
  • Page 44 PARTS G 23UAY ITEM CODE NO. DESCRIPTION REMARKS USED 984-509 SEAL LOCK HEX. SOCKET HD. BOLT M5X14 323-209 TAPPING SCREW (W/FLANGE) D5X35 (BLACK) 306-888 PUSHING BUTTON 320-219 SPRING 326-717 GEAR COVER ASS’Y 1 INCLUD. 3, 4, 16, 18, 19 320-226 SPECIAL NUT M10 320-221 SEAL WASHER...
  • Page 45 PARTS G 23UAY ITEM CODE NO. REMARKS DESCRIPTION USED 322-323 BRUSH HOLDER SET 326-716 BRUSH COVER HITACHI LABEL NAME PLATE 326-724 O-RING 326-725 O-RING 320-236 RESISTOR 320-371 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK 320-235 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK...
  • Page 46 STANDARD ACCESSORIES G 23UAY ITEM CODE NO. DESCRIPTION REMARKS USED 325-491 WRENCH OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-825 D. C. WHEELS 230MM A24R (25 PCS.) 310-337 SUPER WASHER 323-993 PIPE HANDLE SET INCLUD. 604 985-597 BOLT M14 FOR PIPE HANDLE --- 4 --- Printed in Japan...
  • Page 47 Hitachi Power Tools LIST NO. E280 ELECTRIC TOOL PARTS LIST DISC GRINDER 2006 • • Model G 23SEY (E1)
  • Page 48 PARTS G 23SEY ITEM CODE NO. DESCRIPTION REMARKS USED 984-509 SEAL LOCK HEX. SOCKET HD. BOLT M5X14 323-209 TAPPING SCREW (W/FLANGE) D5X35 (BLACK) 306-888 PUSHING BUTTON 320-219 SPRING 326-717 GEAR COVER ASS’Y 1 INCLUD. 3, 4, 16, 18, 19 320-226 SPECIAL NUT M10 320-221 SEAL WASHER...
  • Page 49 EXCEPT FOR AUS, FIN, NOR, SWE, DEN 999-089 CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) EXCEPT FOR AUS, FIN, NOR, SWE, DEN 322-323 BRUSH HOLDER SET 326-716 BRUSH COVER HITACHI LABEL NAME PLATE 326-724 O-RING 326-725 O-RING 320-238 SWITCH (2P PILLAR TYPE) W/SAFETY LOCK...
  • Page 50 STANDARD ACCESSORIES G 23SEY ITEM CODE NO. DESCRIPTION REMARKS USED 325-491 WRENCH 937-907Z WHEEL WASHER (A) FOR AUS, NZL 937-917Z WHEEL NUT (B) FOR AUS, NZL 326-175 CASE FOR FRA 323-713 CASE FOR AUS OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-825...
  • Page 51 Hitachi Power Tools LIST NO. E282 ELECTRIC TOOL PARTS LIST DISC GRINDER 2006 • • Model G 23UBY (E1)
  • Page 52 PARTS G 23UBY ITEM CODE NO. DESCRIPTION REMARKS USED 984-509 SEAL LOCK HEX. SOCKET HD. BOLT M5X14 323-209 TAPPING SCREW (W/FLANGE) D5X35 (BLACK) 306-888 PUSHING BUTTON 320-219 SPRING 326-717 GEAR COVER ASS’Y INCLUD. 3, 4, 16, 18, 19 320-226 SPECIAL NUT M10 320-221 SEAL WASHER 320-222...
  • Page 53 FOR AUT, FRG, ESP, FRA, HOL, ITA 999-089 CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) FOR AUT, FRG, ESP, FRA, HOL, ITA 322-323 BRUSH HOLDER SET 326-716 BRUSH COVER HITACHI LABEL NAME PLATE 326-724 O-RING 326-725 O-RING 320-236 RESISTOR 320-371...
  • Page 54 STANDARD ACCESSORIES G 23UBY ITEM CODE NO. DESCRIPTION REMARKS USED 325-491 WRENCH 937-917Z WHEEL NUT (B) 1 FOR AUS 937-907Z WHEEL WASHER (A) 1 FOR AUS OPTIONAL ACCESSORIES ITEM CODE NO. DESCRIPTION REMARKS USED 316-825 D. C. WHEELS 230MM A24R (25 PCS.) 310-337 SUPER WASHER 323-993...

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