Hitachi DH 24PG Repair Manual
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Hitachi DH 24PG Repair Manual

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PRODUCT NAME
Hitachi Rotary Hammer
DH 24PG
Models
DH 26PB
DH 28PBY
CONTENTS
REPAIR GUIDE ---------------------------------------------------------------------------------------------------------------- 1
1. Precautions on disassembly and reassembly ----------------------------------------------------------- 1
STANDARD REPAIR TIME (UNIT) SCHEDULES ------------------------------------------------------------------ 19
LIST Nos.
DH 24PG: F420
DH 26PB: F417
DH 28PBY: F414
May 2013
DH 28PBY
Sales Division
D
Page

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  • Page 1 LIST Nos. DH 24PG: F420 DH 26PB: F417 DH 28PBY: F414 May 2013 PRODUCT NAME Hitachi Rotary Hammer DH 24PG Models DH 26PB DH 28PBY CONTENTS Page REPAIR GUIDE ---------------------------------------------------------------------------------------------------------------- 1 1. Precautions on disassembly and reassembly ----------------------------------------------------------- 1 STANDARD REPAIR TIME (UNIT) SCHEDULES ------------------------------------------------------------------ 19...

  • Page 2: Repair Guide

    (Bold) numbers in the descriptions below correspond to item numbers in the Parts List and exploded assembly diagram for the Model DH 24PG, <Bold> numbers to those for the Model DH 26PB, and {Bold} numbers to those for the Model DH 28PBY. [Bold] numbers correspond to item numbers for the Models DH 24PG, DH 26PB, and DH 28PBY.
  • Page 3 2. Removing the change lever Push in the Pushing Button [11] at the "Rotation + Hammering" ( mark) position, turn the Change Lever (13)<12>{12} counterclockwise a little, and then fully push in the Pushing Button [11]. In this state, turn the Change Lever (13)<12>{12} clockwise. When the lever stops, release the Pushing Button [11] and then turn the Change Lever (13)<12>{12} clockwise.
  • Page 4 3. Disassembling the hammering mechanism Use a drill bit or screwdriver to push in the Second Hammer [30], and then remove the Striker [36] that is chucked by O-ring (C)[33]. Remove the Tapping Screw (W/Flange) D5 x 35 (66)<66>{76} from the Housing (65)<65>{75} and then detach the Gear Cover [7].
  • Page 5 4. Disassembling the cylinder ass’y (1) Disassembly of the slip clutch ass’y Remove the tool retainer ass’y and pull out the Cylinder [20] ass’y from the Gear Cover [7]. Remove Washer (A) [25] from the Cylinder [20] and then use the retaining ring puller to pull out the Retaining Ring for D30 Shaft [26].
  • Page 6 Reassembly Reassembly can generally be conducted by reversing the disassembly procedure. However, special attention should be given to the following items. 1. Reassembling the cylinder ass’y Insert the set of Hammer Holder (C) [28], Sleeve (FW) [29], the Second Hammer [30], Hammer Holder (A) [31], Damper (A) [32], O-ring (C) [33], and the Damper Holder [34] into the Cylinder [20] to which Oil Seal (A) [27] is press-fitted.
  • Page 7 2. Press-fitting the first gear Match the end of the First Gear [51] with the rear end of the Second Shaft [41] and then press-fit. After press-fitting the First Gear [51], confirm that the inner ring of the Reciprocating Bearing [47] shaft rotates smoothly.
  • Page 8 5. Reassembling the low vibrations mechanism (DH 28PBY) Degrease Weight Damper (A) <54> bonding area of the Inner Cover <53> and then bond Weight Damper (A) <54> to the area. Degrease the threaded portion of Weight (A) <55>, mount Weight (B) <57> and the Leaf Spring <56>...
  • Page 9 6. Mounting the piston Mount the Piston [38] as shown in Fig. 8. Apply the specified grease to the inner and outer circumferences of the Piston [38]. Also apply grease to the inner and outer circumferences of the Piston Pin [39] and Piston Washer [40]. Mount the Piston Washer [40] on the Piston [38] and then insert the Piston Pin [39].
  • Page 10 Fig. 9 Mounting the piston Fig. 10 Mounting the bearing holder Flat portion of Bearing Holder [49] Arm of Reciprocating Bearing [47] Piston [38] Piston Washer [40] Inner Cover [53] Fig. 11 Tightening the bolts Seal Lock Hex. Socket Hd. CAUTION: Do not tighten the bolt when Bolt M5 x 16 [48] it is skewed in contact with...
  • Page 11 7. Reassembling the gear cover ass’y Mount Washer (A) [25] and the Cylinder [20] assembly on the Inner Cover [53] assembly containing the Piston [38], and then mount the Bearing Washer [18] on the front end of the Second Shaft [41]. Put the Change Plate [46] claw on the end of the Clutch [44].
  • Page 12 8. Mounting the change lever Orient the Pushing Button [11] to position its pin at the position shown in Fig. 15 while strongly pressing the Pushing Button [11] into the hole on the Change Lever (13)<12>{12}, and then insert the Change Lever (13)<12>{12} into the Gear Cover [7] assembly so that the pin of the Change Lever (13)<12>{12} is inserted into the center hole of the Change Plate [46].

  • Page 13: Lubrication Points And Types Of Lubricant

    CAUTION: The viscosity and consistency of this specified grease are optimized for the rotary hammer models in order to improve service life. Therefore, applying the ordinary grease used for conventional models (DH 24PB3, etc.) to the Models DH 24PG, DH 26PB and DH 28PBY may dramatically shorten its service life.
  • Page 14 * Apply or fill with the specified grease unless otherwise specified. Fig. 18 Fig. 17 Second Gear [23] Cylinder Clutch [22] Second Hammer [30] Apply to the entire periphery. Apply to the claws. Fig. 20 Fig. 19 Cylinder [20] Apply to the bore surface Reciprocating Bearing [47] Apply to the arm.
  • Page 15 Fig. 24 Fig. 25 Apply to the inner surface of metal. Inner Cover [53] Striker [36] Fill 20 g of grease Apply to the outer surface. inside the cylinder. Fill 3 g of SEP-3A in the recess of the First Gear [51]. Fig.

  • Page 16: Screw Tightening Torque

    Screw tightening torque Hex. Hd. Tapping Screw D4 (61)<61>{68} ······································ 1.96 ± 0.49 N•m (20 ± 5 kgf•cm) Tapping Screw (W/Flange) D4 x 16 (77)<74>{84} ····························· 1.96 ± 0.49 N•m (20 ± 5 kgf•cm) Tapping Screw (W/Flange) D4 x 20 (Black) (82)<82>{92} ··················· 1.96 ± 0.49 N•m (20 ± 5 kgf•cm) Tapping Screw (W/Flange) D5 x 35 (66)<66>{76} ·····························...

  • Page 17: Connecting Diagram

    Connecting diagram Fig. 28 Wiring diagram for the Models DH 24PG, DH 26PB and DH 28PBY without noise suppressor (Reversing switch) (Speed control switch) Switch Switch Brown Black or brown Gray White Stator Cord Stator Black White or blue Blue Fig.
  • Page 18 Fig. 30 Wiring diagram for the Models DH 26PB and DH 28PBY equipped with a noise suppressor and CR units CR unit (Speed control switch) (Reversing switch) Switch Switch Choke Coil <77>{87} Black or brown Brown Gray White Stator Noise Suppressor Cord <76>{86}...
  • Page 19 Switch-related wiring (1) Wiring of the forward/reverse changeover switch As shown in Fig. 32, connect Internal Wire Fig. 32 Wiring of the forward/reverse changeover switch (A) Blue (74)<71>{81} to (1) (number Internal Wire (A) Blue stamped on the forward/reverse (74)<71>{81} or Choke Coil Stator (62)<62>{69}: changeover switch) and Internal Wire (A) White...

  • Page 20: Standard Repair Time (Unit) Schedules

    STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow DH 24PG Handle Switch Cover Cord DH26PB Cord Armor DH 28PBY Housing Stator Armature Ball Bearing (608VVC2) O-ring (P-22) Ball Bearing (608DDC2) General Assembly Front Cap Second Cylinder...
  • Page 21 LIST NO. F420 ROTARY HAMMER 2013 · 5 · 22 Model DH 24PG (E1)
  • Page 22 PARTS DH 24PG ITEM CODE NO. DESCRIPTION REMARKS USED 306-345 FRONT CAP 306-340 STOPPER RING 324-527 GRIP 324-528 BALL HOLDER 324-526 HOLDER PLATE 322-812 HOLDER SPRING 335-258 GEAR COVER NAME PLATE 335-259 OIL SEAL 335-260 BALL BEARING 6805DD 322-789 PUSHING BUTTON...
  • Page 23 PARTS DH 24PG ITEM CODE NO. DESCRIPTION REMARKS USED 335-253 FIRST GEAR 335-245 O-RING D72.2 335-272 INNER COVER 322-816 FELT PACKING 322-818 PACKING WASHER 876-796 O-RING (P-22) 608-DDM BALL BEARING 608DDC2PS2L 982-631 WASHER (A) 360-962C ARMATURE 110 V 360-962U ARMATURE ASS'Y 120 V INCLUD.

  • Page 24: Standard Accessories

    PARTS DH 24PG ITEM CODE NO. DESCRIPTION REMARKS USED 335-256 SWITCH (1P PILLER TYPE) FOR TPE, MEX, PAN (120 V), BRA (127 V), GBR (110 V), VEN 324-537 INTERNAL WIRE (A) (BROWN) FOR BRA, PAN, MEX, THA, INA, UAE, SIN, HKG, IND, VEN...

  • Page 25: Optional Accessories

    OPTIONAL ACCESSORIES DH 24PG ITEM CODE NO. DESCRIPTION REMARKS USED 306-885 DUST COLLECTOR (B) ASS'Y INCLUD. 602, 610 986-802 DUST COLLECTOR ASS'Y INCLUD. 603-609 986-803 DUST COVER 986-804 SEAL COVER 948-310 RETAINING RING FOR D30 SHAFT 958-063 WASHER 959-150 STEEL BALL D6.35 (10 PCS.)
  • Page 26 OPTIONAL ACCESSORIES DH 24PG ITEM CODE NO. DESCRIPTION REMARKS USED 303-046 BULL POINT (SDS+) 250 MM (ROUND SHANK TYPE) 303-044 CHEMICAL ANCHOR ADAPTER (SDS+) 12.7 MM X 90L 303-045 CHEMICAL ANCHOR ADAPTER (SDS+) 19.0 MM X 100L 981-122 SPECIAL SCREW M6 X 22...
  • Page 27 LIST NO. F417 ROTARY HAMMER 2013 · 5 · 22 Model DH 26PB (E1)
  • Page 28 OIL SEAL 335-260 BALL BEARING 6805DD 322-789 PUSHING BUTTON 334-011 CHANGE LEVER 317-223 PUSHING SPRING 878-885 O-RING (S-18) HITACHI LABEL 335-800 SPRING (E) 608-VVM BALL BEARING 608VVC2PS2L 335-250 BEARING WASHER 335-300 STEEL BALL D7.0 (10 PCS.) 335-261 CYLINDER 335-264 PIN D2.5...
  • Page 29 PARTS DH 26PB ITEM CODE NO. DESCRIPTION REMARKS USED 335-253 FIRST GEAR 335-245 O-RING D72.2 335-272 INNER COVER 322-816 FELT PACKING 322-818 PACKING WASHER 876-796 O-RING (P-22) 608-DDM BALL BEARING 608DDC2PS2L 982-631 WASHER (A) 360-961U ARMATURE ASS'Y 110 V-127 V INCLUD.
  • Page 30 PARTS DH 26PB ITEM CODE NO. DESCRIPTION REMARKS USED 324-551 CHOKE COIL (A) BLUE EXCEPT FOR BRA, PAN, MEX, THA, INA, SIN, HKG, UAE, IND, VEN 322-853 PUSHING BUTTON 335-796 SWITCH 335-256 SWITCH (1P PILLER TYPE) FOR TPE, MEX, PAN (120 V), BRA (127 V), GBR (110 V), VEN 335-242 HANDLE COVER...
  • Page 31 OPTIONAL ACCESSORIES DH 26PB ITEM CODE NO. DESCRIPTION REMARKS USED 306-885 DUST COLLECTOR (B) ASS'Y INCLUD. 602, 610 986-802 DUST COLLECTOR ASS'Y INCLUD. 603-609 986-803 DUST COVER 986-804 SEAL COVER 948-310 RETAINING RING FOR D30 SHAFT 958-063 WASHER 959-150 STEEL BALL D6.35 (10 PCS.) 986-805 OUTER RACE 986-806...
  • Page 32 OPTIONAL ACCESSORIES DH 26PB ITEM CODE NO. DESCRIPTION REMARKS USED 303-046 BULL POINT (SDS+) 250 MM (ROUND SHANK TYPE) 303-044 CHEMICAL ANCHOR ADAPTER (SDS+) 12.7 MM X 90L 303-045 CHEMICAL ANCHOR ADAPTER (SDS+) 19.0 MM X 100L 981-122 SPECIAL SCREW M6 X 22 930-515 CHUCK WRENCH 10G 302-976...
  • Page 33 LIST NO. F414 ROTARY HAMMER 2013 · 5 · 22 Model DH 28PBY (E1)
  • Page 34 OIL SEAL 335-260 BALL BEARING 6805DD 322-789 PUSHING BUTTON 334-011 CHANGE LEVER 317-223 PUSHING SPRING 878-885 O-RING (S-18) HITACHI LABEL 335-800 SPRING (E) 608-VVM BALL BEARING 608VVC2PS2L 335-250 BEARING WASHER 335-300 STEEL BALL D7.0 (10 PCS.) 335-261 CYLINDER 335-264 PIN D2.5...
  • Page 35 PARTS DH 28PBY ITEM CODE NO. DESCRIPTION REMARKS USED 335-253 FIRST GEAR 335-245 O-RING D72.2 335-798 INNER COVER 335-285 WEIGHT DAMPER (A) 335-280 WEIGHT (A) 335-282 LEAF SPRING 335-281 WEIGHT (B) 325-241 SEAL LOCK HEX. SOCKET HD. BOLT M3 X 8 322-816 FELT PACKING 322-818...
  • Page 36 PARTS DH 28PBY ITEM CODE NO. DESCRIPTION REMARKS USED 324-537 INTERNAL WIRE (A) (BROWN) FOR BRA, PAN, MEX, THA, INA, SIN, HKG, UAE, IND, VEN 937-631 CORD CLIP 984-750 TAPPING SCREW (W/FLANGE) D4 X 16 953-327 CORD ARMOR D8.8 938-051 CORD ARMOR D10.1 930-039 NOISE SUPPRESSOR...
  • Page 37 OPTIONAL ACCESSORIES DH 28PBY ITEM CODE NO. DESCRIPTION REMARKS USED 306-885 DUST COLLECTOR (B) ASS'Y INCLUD. 602, 610 986-802 DUST COLLECTOR ASS'Y INCLUD. 603-609 986-803 DUST COVER 986-804 SEAL COVER 948-310 RETAINING RING FOR D30 SHAFT 958-063 WASHER 959-150 STEEL BALL D6.35 (10 PCS.) 986-805 OUTER RACE 986-806...
  • Page 38 OPTIONAL ACCESSORIES DH 28PBY ITEM CODE NO. DESCRIPTION REMARKS USED 303-046 BULL POINT (SDS+) 250 MM (ROUND SHANK TYPE) 303-044 CHEMICAL ANCHOR ADAPTER (SDS+) 12.7 MM X 90L 303-045 CHEMICAL ANCHOR ADAPTER (SDS+) 19.0 MM X 100L 981-122 SPECIAL SCREW M6 X 22 930-515 CHUCK WRENCH 10G 302-976...

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