Hitachi DH 26PX Service Manual
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Hitachi DH 26PX Service Manual

Hitachi DH 26PX Service Manual

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PRODUCT NAME
Hitachi Rotary Hammer
DH 24PH
Models
DH 26PC
DH 28PCY
CONTENTS
REPAIR GUIDE ---------------------------------------------------------------------------------------------------------------- 1
1. Precautions on disassembly and reassembly ----------------------------------------------------------- 1
STANDARD REPAIR TIME (UNIT) SCHEDULES ------------------------------------------------------------------ 20
DH 24PX
DH 26PX
DH 28PX
DH 28PCY
LIST Nos.
DH 24PH: F421
DH 24PX: F422
DH 26PC: F418
DH 26PX: F419
DH 28PCY: F415
DH 28PX: F416
May 2013
Page
Sales Division
D

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  • Page 1 LIST Nos. DH 24PH: F421 DH 24PX: F422 DH 26PC: F418 DH 26PX: F419 DH 28PCY: F415 DH 28PX: F416 May 2013 PRODUCT NAME Hitachi Rotary Hammer DH 24PH DH 24PX Models DH 26PC DH 26PX DH 28PCY DH 28PX...

  • Page 2: Repair Guide

    Model DH 24PH, {Bold} numbers to those for the Model DH 26PC, <Bold> numbers to those for the Model DH 28PCY, ((Bold)) numbers to those for the Model DH 24PX, {{Bold}} numbers to those for the Model DH 26PX, and <<Bold>> numbers to those for the Model DH 28PX.
  • Page 3 2. Disassembly of the hammering mechanism Use a drill bit or screwdriver to push in the Second Hammer [29] from its front end, and then remove the Striker [35] that is chucked by O-ring (C) [32]. Remove the Tapping Screw (W/Flange) D5 x 35 (67){67} <77>((66)){{67}}<<77>>...
  • Page 4 3. Removing the change lever Push in the Pushing Button [11] at the "Hammering only" ( mark) position, turn the Change Lever [13] counterclockwise a little, and then fully push in the Pushing Button [11]. In this state, turn the Change Lever [13] clockwise.
  • Page 5 4. Disassembling the cylinder ass’y (1) Disassembly of the slip clutch Remove all tool retainers and pull out the Cylinder [19] assembly from the Gear Cover [7]. Remove Washer (A) [24] from the Cylinder [19] and then use the retaining ring puller to pull out the Retaining Ring for D30 Shaft [25].
  • 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) [27], Sleeve (FW) [28], the Second Hammer [29], Hammer Holder (A) [30], Damper (A) [31], O-ring (C) [32], and the Damper Holder [33] into the Cylinder [19] to which Oil Seal (A) [26] is press-fitted.
  • Page 7 2. Press-fitting the first gear Match the end of the First Gear [52] with the rear end of the Second Shaft (46){47}<47>((46)){{47}} <<47>> and then press-fit. After press-fitting the First Gear [52], confirm that the inner ring of the Reciprocating Bearing (47){48}<48>((47)){{48}}<<48>> shaft rotates smoothly. 3.
  • Page 8 5. Reassembling the low vibrations mechanism (DH 28PCY and DH 28PX) Degrease Weight Damper (A) <55><<55>> bonding area of the Inner Cover <54><<54>> and then bond Weight Damper (A) <55><<55>> to the area. Degrease the threaded portion of Weight (A) <56><<56>>, mount Weight (B) <58><<58>>...
  • Page 9 6. Mounting the piston Mount the Piston [37] as shown in Fig. 9. Apply the specified grease to the inner and outer circumferences of the Piston [37]. Also apply grease to the inner and outer circumferences of the Piston Pin [38] and Piston Washer (39){40}<40>((39)){{40}} <<40>>.
  • Page 10 Fig. 10 Mounting the piston Fig. 11 Mounting the bearing holder Flat portion of Bearing Holder [50] Arm of Reciprocating Bearing (47){48}<48>((47){{48}}<<48>> Piston [37] Piston Washer (39){40}<40>((39)){{40}}<<40>> Inner Cover [54] Fig. 12 Tightening the bolts Seal Lock Hex. Socket Hd. CAUTION: Do not tighten the bolt when Bolt M5 x 16 [49] it is skewed in contact with...
  • Page 11 7. Mounting the change lever Fill the Pinion Sleeve (40){41}<41>((40)){{41}}<<41>> with NIPPECO SEP-3A and insert it into Ball Bearing 608VVC2PS2L [17] of the Gear Cover [7]. Insert Spring (E) [16] into the 5.4 hole at the remote end of the Gear Cover [7]. Apply the specified grease to the Second Gear [22] of the Cylinder [19] ass’y and then insert it into Ball Bearing 6805DD [10].
  • Page 12 8. Reassembling the gear cover ass’y Assemble as shown in Fig. 15 and confirm that the Change Lever [13] is set to the "Rotation + Hammering" ( mark) position, and then move the Piston [37] to the bottom dead point. Lay the Gear Cover [7] ass’y into position until the front end of the Piston [37] is inserted into the Cylinder [19].
  • Page 13 9. Operation check If an improperly assembled product is powered on, components of the running motor may be damaged. To prevent this, you must first check the operation of the assembled product by following the procedure below. (1) After reassembly, turn the Change Lever [13] from "Rotation + Hammering" ( mark) to "Rotation only"...

  • Page 14: Lubrication Points And Types Of Lubricant

    Lubrication points and types of lubricant Periphery of the Second Hammer [29] (Fig. 17), O-ring (C) [32], and Damper (A) [31]: Apply specified grease. Second Gear [22] and Cylinder Clutch [21] claws: Apply specified grease. (Fig. 18) Pin D2.5 [20]: Apply NIPPECO SEP-3A grease. Inner circumference of the Cylinder [19] (sliding portion of the piston): Apply specified grease.
  • Page 15 * Apply or fill with the specified grease unless otherwise specified. Fig. 18 Fig. 17 Second Gear [22] Cylinder Clutch [21] Second Hammer [29] Apply to the entire periphery. Apply to the claws. Fig. 20 Fig. 19 Cylinder [19] Reciprocating Bearing Apply to the bore surface (47){48}<48>...
  • Page 16 Fig. 24 Fig. 25 Striker [35] Pinion Sleeve (40){41}<41>((40)){{41}}<<41>> Fill SEP-3A in the bore part. Apply to the outer surface. Fig. 26 Apply to the inner surface of metal. Inner Cover [54] Fill 20 g of grease inside the cylinder. Fill 3 g of SEP-3A in the recess of the First Gear [52].

  • Page 17: Screw Tightening Torque

    Screw tightening torque Hex. Hd. Tapping Screw D4 (62){62}<69>((62)){{62}}<<69>> ············· 1.96 ± 0.49 N•m (20 ± 5 kgf•cm) Tapping Screw (W/Flange) D4 x 16 (78){75}<85>((77)){{74}}<<84>> ··· 1.96 ± 0.49 N•m (20 ± 5 kgf•cm) Tapping Screw (W/Flange) D4 x 20 (Black) (83){83}<93>((81)){{81}}<<91>>...

  • Page 18: Connecting Diagram

    Stator Cord Stator Black White or blue Blue Fig. 30 Wiring diagram for the Models DH 24PH and DH 24PX equipped with a noise suppressor CR unit (Reversing switch) (Speed control switch) Switch Switch Choke Coil (A) (80)((78)) Black or brown...
  • Page 19 Fig. 31 Wiring diagram for the Models DH 26PC, DH 26PX, DH 28PCY and DH 28PX equipped with a noise suppressor and CR units (Speed control switch) (Reversing switch) CR unit Switch Switch Choke Coil (A) {78}{{76}}<88><<86>> Black or brown Brown Gray White...
  • Page 20 Switch-related wiring (1) Wiring of the forward/reverse changeover switch As shown in Fig. 33, connect Internal Wire (A) (Blue) [75]{72}<82> or Choke Coil (A) Fig. 33 Wiring of the forward/reverse changeover switch (Blue) (81){79}<89>((79)){{77}} <<87>> to Internal Wire (A) (Blue) (75){72}<82> Stator (63){63}<70>...

  • Page 21: Standard Repair Time (Unit) Schedules

    STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL 60 min. Fixed Work Flow Handle Switch DH 24PH Cover Cord Cord Armor DH 24PX Housing Stator DH 26PC Armature DH 26PX Ball Bearing (608VVC2) DH 28PCY O-ring (P-22) Ball Bearing DH 28PX...
  • Page 22 LIST NO. F421 ROTARY HAMMER 2013 · 5 · 22 Model DH 24PH (E1)
  • Page 23 OIL SEAL 335-260 BALL BEARING 6805DD 322-789 PUSHING BUTTON 317-223 PUSHING SPRING 334-011 CHANGE LEVER 878-885 O-RING (S-18) HITACHI LABEL 335-800 SPRING (E) 608-VVM BALL BEARING 608VVC2PS2L 335-300 STEEL BALL D7.0 (10 PCS.) 335-261 CYLINDER 335-264 PIN D2.5 335-263 CYLINDER CLUTCH...
  • Page 24 PARTS DH 24PH ITEM CODE NO. DESCRIPTION REMARKS USED 335-271 BEARING COVER 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 25: Standard Accessories

    PARTS DH 24PH ITEM CODE NO. DESCRIPTION REMARKS USED 324-537 INTERNAL WIRE (A) (BROWN) FOR BRA, PAN, MEX, THA, INA, UAE, HKG, MAL, IND, VEN 324-538 INTERNAL WIRE (A) (BLUE) FOR BRA, PAN, MEX, THA, INA, UAE, HKG, MAL, IND, VEN 953-327 CORD ARMOR D8.8 938-051...

  • Page 26: Optional Accessories

    OPTIONAL ACCESSORIES DH 24PH 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 27 OPTIONAL ACCESSORIES DH 24PH 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 28 LIST NO. F422 ROTARY HAMMER 2013 · 5 · 22 Model DH 24PX (E1)
  • Page 29 PARTS DH 24PX 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 335-274 GEAR COVER NAME PLATE 335-259 OIL SEAL 335-260 BALL BEARING 6805DD 322-789 PUSHING BUTTON...
  • Page 30 PARTS DH 24PX ITEM CODE NO. DESCRIPTION REMARKS USED 335-271 BEARING COVER 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...
  • Page 31 STANDARD ACCESSORIES DH 24PX ITEM ITEM CODE NO. CODE NO. DESCRIPTION REMARKS USED 335-257 CASE 324-548 SIDE HANDLE 303-709 DEPTH GAUGE - 4 - 5 - 13 *ALTERNATIVE PARTS...
  • Page 32 OPTIONAL ACCESSORIES DH 24PX 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 33 OPTIONAL ACCESSORIES DH 24PX 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 34 LIST NO. F418 ROTARY HAMMER 2013 · 5 · 22 Model DH 26PC (E1)
  • Page 35 OIL SEAL 335-260 BALL BEARING 6805DD 322-789 PUSHING BUTTON 317-223 PUSHING SPRING 334-011 CHANGE LEVER 878-885 O-RING (S-18) HITACHI LABEL 335-800 SPRING (E) 608-VVM BALL BEARING 608VVC2PS2L 335-300 STEEL BALL D7.0 (10 PCS.) 335-261 CYLINDER 335-264 PIN D2.5 335-263 CYLINDER CLUTCH...
  • Page 36 PARTS DH 26PC ITEM CODE NO. DESCRIPTION REMARKS USED 335-271 BEARING COVER 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 37 PARTS DH 26PC ITEM CODE NO. DESCRIPTION REMARKS USED 324-551 CHOKE COIL (A) BLUE EXCEPT FOR BRA, PAN, MEX, THA, INA, MAL, 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), VEN 335-242 HANDLE COVER...
  • Page 38 OPTIONAL ACCESSORIES DH 26PC 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 39 OPTIONAL ACCESSORIES DH 26PC 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 40 LIST NO. F419 ROTARY HAMMER 2013 · 5 · 22 Model DH 26PX (E1)
  • Page 41 OIL SEAL 335-260 BALL BEARING 6805DD 322-789 PUSHING BUTTON 317-223 PUSHING SPRING 334-011 CHANGE LEVER 878-885 O-RING (S-18) HITACHI LABEL 335-800 SPRING (E) 608-VVM BALL BEARING 608VVC2PS2L 335-300 STEEL BALL D7.0 (10 PCS.) 335-261 CYLINDER 335-264 PIN D2.5 335-263 CYLINDER CLUTCH...
  • Page 42 PARTS DH 26PX ITEM CODE NO. DESCRIPTION REMARKS USED 335-271 BEARING COVER 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 43 STANDARD ACCESSORIES DH 26PX ITEM ITEM CODE NO. CODE NO. DESCRIPTION REMARKS USED 335-257 CASE 335-273 SIDE HANDLE 303-709 DEPTH GAUGE - 4 - 5 - 13 *ALTERNATIVE PARTS...
  • Page 44 OPTIONAL ACCESSORIES DH 26PX 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 45 OPTIONAL ACCESSORIES DH 26PX 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 46 LIST NO. F415 ROTARY HAMMER 2013 · 5 · 22 Model DH 28PCY (E1)
  • Page 47 OIL SEAL 335-260 BALL BEARING 6805DD 322-789 PUSHING BUTTON 317-223 PUSHING SPRING 334-011 CHANGE LEVER 878-885 O-RING (S-18) HITACHI LABEL 335-800 SPRING (E) 608-VVM BALL BEARING 608VVC2PS2L 335-300 STEEL BALL D7.0 (10 PCS.) 335-261 CYLINDER 335-264 PIN D2.5 335-263 CYLINDER CLUTCH...
  • Page 48 PARTS DH 28PCY ITEM CODE NO. DESCRIPTION REMARKS USED 335-271 BEARING COVER 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 49 PARTS DH 28PCY ITEM CODE NO. DESCRIPTION REMARKS USED 324-537 INTERNAL WIRE (A) (BROWN) FOR BRA, PAN, MEX, THA, INA, MAL, 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 50 OPTIONAL ACCESSORIES DH 28PCY 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 51 OPTIONAL ACCESSORIES DH 28PCY 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 52 LIST NO. F416 ROTARY HAMMER 2013 · 5 · 22 Model DH 28PX (E1)
  • Page 53 OIL SEAL 335-260 BALL BEARING 6805DD 322-789 PUSHING BUTTON 317-223 PUSHING SPRING 334-011 CHANGE LEVER 878-885 O-RING (S-18) HITACHI LABEL 335-800 SPRING (E) 608-VVM BALL BEARING 608VVC2PS2L 335-300 STEEL BALL D7.0 (10 PCS.) 335-261 CYLINDER 335-264 PIN D2.5 335-263 CYLINDER CLUTCH...
  • Page 54 PARTS DH 28PX ITEM CODE NO. DESCRIPTION REMARKS USED 335-271 BEARING COVER 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 55 STANDARD ACCESSORIES DH 28PX ITEM ITEM CODE NO. CODE NO. DESCRIPTION REMARKS USED 335-257 CASE 335-273 SIDE HANDLE 303-709 DEPTH GAUGE - 4 - 5 - 13 *ALTERNATIVE PARTS...
  • Page 56 OPTIONAL ACCESSORIES DH 28PX 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 57 OPTIONAL ACCESSORIES DH 28PX 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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