Hitachi DH 24PC3 Technical Data And Service Manual Download Page 23

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8-3. "Three-Mode" Changeover Mechanism

The change lever of the Model DH 24PC3 permits quick and easy changeover among the "rotation and

hammering", "rotation only" and "hammering only" functions. Each function mode is explained below. When

operating the change lever, be sure to continue pressing the pushing button.

(1) Rotation and hammering (Fig. 6)

Adjust the change lever to "rotation and hammering" ( marks). Armature rotation is transmitted to the first

gear and second shaft, and then to the clutch via the spline of the second shaft. Claws on the end surface of

the clutch engage with matching claws of the reciprocating bearing ( A portion in the figure) to convert the

rotation into reciprocating motion. Three claws on the tip of the second shaft engage with matching three

claws of the pinion sleeve all the time, and the second shaft rotation is transmitted to the pinion sleeve. Then

claws on the large-dia. portion of pinion sleeve engage with the second pinion ( B portion in the figure), and

the rotation is transmitted to the second gear and the cylinder.

Armature

Cylinder

Theree claws of second shaft

Spline of the second shaft

Second shaft

Second gear

Change lever

Fig. 6

First gear

Pinion sleeve

Reciprocating bearing

Second pinion

B portion is engaged.
(rotation transmitted).

Clutch

A portion is meshed
(hammering transmitted).

Summary of Contents for DH 24PC3

Page 1: ...TECHNICAL DATA AND SERVICE MANUAL ROTARY HAMMER DH 24PC3 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E489 May 2005 D MODEL DH 24PC3 Hitachi Power Tools ...

Page 2: ...ATA AND SERVICE MANUAL symbols are used in the place of company names and model names of our competitors The symbols utilized here are as follows Symbols Utilized Competitors Company Name Model Name MAKITA HR2450 C BOSCH GBH2 24DSR N B ...

Page 3: ...NS IN SALES PROMOTION 14 7 1 Handling Instructions 14 7 2 Caution Plate 14 8 REFERENCE MATERIAL 15 8 1 Lubrication 15 8 2 Tool Structure 15 8 3 Three Mode Changeover Mechanism 20 8 4 Drill Bits 23 8 5 Chuck Section 24 8 6 Dust Collector B 24 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 26 9 1 Disassembly 26 9 2 Reassembly 30 9 3 Tightening Torque 33 9 4 Wiring Diagrams 33 9 5 Internal Wire Arrangem...

Page 4: ...thanks to the internal pressure adjustment mechanism 4 Non slip double layer molded handle and gear cover 5 New and powerful design aiming at iF design award 3 APPLICATIONS 1 Rotation and hammering function Drilling anchor holes Drilling holes in concrete tile brick and similar materials 2 Rotation only function Drilling holes in steel and wood with chuck adapter Tightening and loosening machine s...

Page 5: ...NTS Non slip double layer molded handle Class top drilling speed More comfortable and frisky drilling New and powerful design Non slip double layer molded gear cover Compact body Internal pressure adjustment mechanism ...

Page 6: ...han C thanks to the efficient transmission of the hammering energy 4 1 4 More comfortable and frisky drilling The Model DH 24PC3 can drill holes more comfortably and friskily with a light pushing force because the quantity of body jumping is 20 less than C 4 1 5 Internal pressure adjustment mechanism By minimizing variations in the internal pressure during operation hammering operation is stabiliz...

Page 7: ...00 min 1 Housing Handle cover Gear cover AC single phase commutator motor Type of motor Model DH 24PC3 13 mm 1 2 32 mm 1 1 4 Voltage V Current A Power input W 110 7 6 800 Rotation speed Forward 0 to 1 150 min 1 Reverse 0 to 550 min 1 Type of switch Speed control switch with reversing switch Gun type handle of main body and side handle Type of handle Glassfiber reinforced polyamide resin green and ...

Page 8: ... Code No 306369 306368 306370 Code No Adapter for slender shaft Drill bit slender shaft 1 Drill bit taper shank 2 Taper shank adapter SDS plus shank Drill bit taper shank 21 5 27 32 944464 Morse taper No 2 303618 3 Cotter 303619 303620 Taper shank adapters A taper or B taper is provided as an optional accessory but drill bit is not provided A taper B taper Code No Part name Straight shank bit for ...

Page 9: ... 1 4 Anchor setting adapter A W 5 16 Anchor setting adapter A W 3 8 Anchor setting adapter A W 1 2 Anchor setting adapter A W 5 8 Anchor setting adapter A Code No 971794 971795 971796 971797 971798 Part name W 1 4 Anchor setting adapter B W 5 16 Anchor setting adapter B W 3 8 Anchor setting adapter B W 1 2 Anchor setting adapter B W 5 8 Anchor setting adapter B Internal cone type External cone typ...

Page 10: ... 32 1 1 4 35 1 3 8 38 1 1 2 45 1 25 32 Code No 982686 982687 982688 982689 Core bit outer diameter mm 50 2 Code No 982690 Outer diameter mm 25 31 32 29 5 32 32 1 1 4 35 1 3 8 38 1 1 2 Code No 982672 982673 982674 982675 982676 Outer diameter mm 45 1 25 32 50 2 Code No 982677 982678 Core bit shank A Code No 303625 Code No 303626 4 Core bit shank SDS plus shank Core bit shank B Core bit outer diamet...

Page 11: ... 8 Code No 316659 G Grooving hammering only Code No 316657 Code No 316658 F Groove digging and edging hammering only Cold chisel SDS plus chank Grooving chisel SDS plus shank Cutter SDS plus shank ...

Page 12: ...of the drill chuck and securely fix the drill chuck to chuck adapter G with the special screw a left hand threaded M6 screw when mounting the drill chuck onto chuck adapter G Chuck wrench Part name Chuck adapter G for SDS plus shank system 13 mm 1 2 Drill chuck 13VLRB D with chuck wrench Special screw M6 left hand threaded Code No a b c 2 Slotted head minus bit Overall length 50 mm For use with sl...

Page 13: ...used for reverse rotaion If reverse rotation is to be used for loosening screws use the plus bit Bit No 2 described below by attaching it directly to chuck adapter D Screw size Chuck adapter D SDS plus shank Chuck wrench Bit No Chuck adapter D SDS plus shank Code No 971787 Code No 306885 K Grease for electric impact drill Containing 500 g 17 64 oz Code No 980927 Containing 30 g 1 06 oz Code No 981...

Page 14: ...eight excludes cord and side handle mm 78 3 1 16 Function Forward reverse changeover switch Tool retainer Double layer molded handle Push button type 3 modes Changeover modes One push type 3 modes 3 modes HITACHI DH 24PC2 24 15 16 720 0 1 150 0 4 600 2 5 5 5 lbs 13 1 2 351 13 13 16 198 7 51 64 32 1 1 4 69 2 23 32 Push button type One push type B 24 15 16 680 0 870 0 4 400 2 4 5 3 lbs 13 1 2 360 14...

Page 15: ...parison Drilling speed varies considerably depending on the work conditions Use the factory test results shown in Fig 1 for comparison purpose only Fig 1 Drill bit dia mm Drilling speed mm min Test conditions Direction Downward drilling Pushing force 98 N 10 kgf Test material Concrete panel with a compression strength of 2 352 N cm2 240 kgf cm2 ...

Page 16: ... varies considerably depending on the work conditions Use the factory test results shown in Fig 2 for comparison purposes only Voltage supply Maker Model HITACHI HITACHI DH 24PC3 DH 24PC2 B C 230 V 32 31 20 27 Chiseling amount kg 30 min 30 25 15 10 5 35 0 20 Fig 2 ...

Page 17: ...s inherent in the use of any electric power tool cannot be completely eliminated Accordingly general precautions and suggestions for the use of electric power tools and specific precautions and suggestions for the use of the Rotary Hammer are 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 ...

Page 18: ...ammer drills the armature shaft in the Model DH 24PC3 is in parallel with the tool shaft the same structure that is employed in most impact drills This structure was adopted in order to make the Model DH 24PC3 more compact for easier handling and operation Thus the appearance of the Model DH 24PC3 is similar to that of an impact drill The rotation of the armature is transmitted to the second shaft...

Page 19: ...n is then transmitted through a spline to the clutch which engages with a reciprocating bearing and causes it to rotate However as illustrated circular grooves on the inner race of the reciprocating bearing are positioned on an angle of inclination with relation to the second shaft The rotation of the inner race and the shaft causes the angle of inclination to change regularly forward and back wit...

Page 20: ... Model DH 24PC3 is different from that of conventional rotary hammers When the drill bit is lifted from the work surface on completion of drilling the second hammer moves to the position indicated by the continuous lines in Fig 4 and the protruding lip portion at the tip of the striker is gripped by O ring C mounted between the hammer holder and the damper holder In this state should the piston co...

Page 21: ...the tool by the operator Sealed and dustproof construction The gear cover is totally enclosed by oil seals O rings and other devices to prevent leakage of lubricating grease and to keep dust and dirt out of the internal mechanisms The drill bit chuck portion is protected by a rubber front cap to keep out dust and chips which could cause improper fitting of the drill bit and or other faulty operati...

Page 22: ...side air in the gear cover This passage is sandwiched between felt packings to pass only air pressure Thus variations in the internal pressure are minimized for stable hammering operation and prevention of idling and grease leakage Inner cover Inside the gear cover Felt packing A Valve Felt packing B Outside the gear cover Air passage A A 2 1 ...

Page 23: ...utch engage with matching claws of the reciprocating bearing A portion in the figure to convert the rotation into reciprocating motion Three claws on the tip of the second shaft engage with matching three claws of the pinion sleeve all the time and the second shaft rotation is transmitted to the pinion sleeve Then claws on the large dia portion of pinion sleeve engage with the second pinion B port...

Page 24: ...Change lever pin Claw of reciprocating bearing Reciprocating bearing Lock plate rear end portion 3 Hammering only Fig 8 Adjust the change lever to hammering only mark The second pinion is moved to the motor side by the pin of the change lever Engagement between the pinion sleeve and the second pinion is released and no rotation is transmitted B portion in the figure The lock plate is moved to the ...

Page 25: ...d for positioning a tool such as a flat chisel Adjust the change lever to a position halfway between hammering only mark and rotation and hammering marks Engagement between the pinion sleeve and the second pinion B portion in the figure and between the lock plate and the locking claw of the second pinion C portion in the figure is released and the cylinder rotates freely Simply turn the grip to ad...

Page 26: ...g off Key slot two pieces Key rail 2 pcs Shape of SDS plus shank bit Ball holder Steel ball Section A A Cylinder Fig 10 The service life of a drill bit with a diameter of 8 mm is approximately 300 holes when drilling into concrete to a depth of 30 mm If reground before the end of its service life the drill bit will continue to provide efficient drilling Figure 11 shows the regrinding angle Regrind...

Page 27: ...urface inertia may cause dust collector B to become disconnected from the grip Accordingly caution the customer to press dust collector B and drill bit firmly against the concrete surface before turning on the switch to start drilling When dust collector B is used almost no dust and chips are scattered about However since the chips and dust remaining in the collector may scatter after completion o...

Page 28: ...e Drill bit length 166 mm Dust cover Washer Outer race Steel Ball D6 35 Socket Approx 72 mm 2 27 32 Approx 16 mm 5 8 Fig 13 Dust collector B structure Retaining ring for D30 shaft Seal cover Socket adapter B Drill bit length 110 mm ...

Page 29: ...Remove Spring B 22 from the rails in the Gear Cover Ass y 10 as shown in Fig 14 Pull out the Second Pinion 49 Clutch Spring 50 Clutch 51 and the Lock Plate 48 these parts are sandwiched by means of the Lock Plate 48 as a unit as shown in Fig 15 from the end of the Second Shaft 52 Turn the Reciprocating Bearing 53 so that the Piston 39 is moved to its maximum upper position Inner Cover Ass y 41 sid...

Page 30: ...embly of the tool retainer Slide the Grip 3 fully in the arrow direction as shown in Fig 17 and remove the Front Cap 1 Pulling the Grip 3 as shown in Fig 18 remove the Stopper Ring 2 with a retaining ring puller Then the Grip 3 Ball Holder 4 Steel Ball D7 0 23 Holder Plate 5 Holder Spring 6 and Washer B 7 can be removed from the Cylinder 24 Front Cap 1 Stopper Ring 2 Ball Holder 4 Holder Plate 5 H...

Page 31: ...Hammer Holder 31 O ring B 32 Damper A 33 O ring C 34 and Damper Holder 35 can be removed from the Cylinder 24 As shown in Fig 19 insert the no hole side of stopper ring jig A J 341 into the Cylinder 24 until it contacts the end surface of the Damper Holder 35 Hold the Cylinder 24 and the end surface of stopper ring jig A J 341 with a vise and compress Damper A 33 it moves a little when the Stopper...

Page 32: ...5 and fix the pinion sleeve puller to a vise Pull the Gear Cover Ass y 10 to remove the Pinion Sleeve 47 from the Gear Cover Ass y 10 Figs 20 and 21 Claws of pinion sleeve puller Pinion sleeve puller J 302 Hold with a vise Pinion sleeve puller J 302 Fig 20 Pinion Sleeve 47 Gear Cover Ass y 10 Pinion Sleeve 47 Adjuster Fig 21 ...

Page 33: ...1 Apply Molub Alloy No 777 1 grease to the contact portion between the Clutch 51 and the Lock Plate 48 Fill Molub Alloy No 777 1 grease in the ball portion of the Reciprocating Bearing 53 Apply Hitachi Motor Grease No 29 to the O ring S 18 20 for the Steel Ball D7 0 23 and the Change Lever 21 2 Mounting the Cylinder 24 Mount the Second Hammer 29 O ring 1AP 20 30 Hammer Holder 31 O ring B 32 Damper...

Page 34: ...he Second Shaft 52 After press fitting the First Gear 54 check that the inside ring of the Reciprocating Bearing 53 turns smoothly 5 Reassembly of the oil seal Prior to reassembly apply grease to the inner circumference of the Oil Seal 12 However do not apply grease to its outer circumference Also when press fitting the Oil Seal 12 ensure that it is straight and level 6 Reassembly of the internal ...

Page 35: ...he Second Shaft 52 contacts the Pinion Sleeve 47 inside the Gear Cover Ass y 10 move the Change Lever 21 to the rotation and hammering mode and rotate the Grip 3 Then the Second Shaft 52 and the Pinion Sleeve 47 are engaged and the end surface of the Gear Cover Ass y 10 contacts that of the Housing 68 At this time rotate the Grip 3 to check that the rotation of the Cylinder 24 is transmitted to th...

Page 36: ...ise suppressor Fig 28 9 3 Tightening Torque Tapping Screws D4 64 82 2 0 0 5 N m 20 5 kgf cm 17 4 4 3 in lbs Tapping Screws W Flange D5 X 35 9 2 9 0 5 N m 30 5 kgf cm 26 0 4 3 in lbs 9 4 Wiring Diagrams 1 Product with noise suppressor ...

Page 37: ... 34 Fig 29 CHOKE COIL A BLUE 72 9 5 Internal Wire Arrangement and Wiring Work A Internal wire arrangement 1 Product with noise suppressor CHOKE COIL A BROWN 69 NOISE SUPPRESSOR 78 ...

Page 38: ... 35 Fig 30 2 Product without noise suppressor ...

Page 39: ...ray coming from the stator into the terminal M1 and the lead wire red into the terminal M2 Insert each lead wire white coming from the noise suppressor into the terminal C1 and C2 After insertion pull each lead wire slightly to check the lead wires do not come off To disconnect the lead wires insert a small flat blade screwdriver into the windows near the terminals and pull out the lead wires Fig ...

Page 40: ...s y O ring P 22 Ball Bearing 608DD Ball Bearing 608VV Inner Cover Ass y Pinion Sleeve Lock Plate Second Pinion Clutch Spring Clutch Second Shaft Reciprocating Bearing First Gear Ball Bearing 626VV General Assembly Housing Stator Second Hammer O ring 1AP 20 Hammer Holder O ring B Damper A O ring C Damper Holder Cylinder Second Gear Spring A Front Cap Grip Ball Holder Holder Spring Steel Ball D7 0 G...

Page 41: ...tachi Power Tools 1 2 3 4 5 6 7 8 9 10 11 12 13 15 16 17 18 19 20 21 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 61 66 67 68 69 71 73 74 75 76 77 75 78 80 81 82 86 84 85 14 22 44 45 46 70 72 501 502 503 79 83 ...

Page 42: ...78 885 O RING S 18 1 21 324 603 CHANGE LEVER 1 22 317 238 SPRING B 2 23 959 156 STEEL BALL D7 0 10 PCS 1 24 323 184 CYLINDER 1 25 323 185 SECOND GEAR 1 26 317 233 SPRING A 1 27 317 234 WASHER A 1 28 317 235 RETAINING RING D30 1 29 324 525 SECOND HAMMER 1 30 944 486 O RING 1AP 20 1 31 324 523 HAMMER HOLDER 1 32 322 802 O RING B 1 33 322 805 DAMPER A 1 34 322 808 O RING C 1 35 324 524 DAMPER HOLDER ...

Page 43: ...536 SWITCH 1P PILLAR TYPE 1 71 322 853 PUSHING BUTTON 1 72 324 551 CHOKE COIL A BLUE 1 EXCEPT FOR USA CAN GBR 110V INA IND SYR KUW SIN HKG 72 324 552 CHOKE COIL A BLUE 1 FOR GBR 110V 73 324 538 INTERNAL WIRE A BLUE 1 FOR USA CAN INA IND SYR KUW SIN HKG 74 999 041 CARBON BRUSH 1 PAIR 1 75 955 203 BRUSH HOLDER 2 76 324 537 INTERNAL WIRE A BROWN 1 FOR USA CAN INA IND SYR KUW SIN HKG 77 999 072 CARBON...

Page 44: ...TIVE PARTS 4 ITEM NO CODE NO DESCRIPTION REMARKS NO USED PARTS 5 05 DH 24PC3 86 500 424Z CORD 1 CORD ARMOR D8 8 FOR KUW SIN 86 500 456Z CORD 1 CORD ARMOR D8 8 FOR CHN 86 500 440Z CORD 1 CORD ARMOR D8 8 FOR HKG ...

Page 45: ... FLAT HD SCREW A LEFT HAND M6X25 1 618 321 813 DRILL CHUCK 13VLD D 1 619 971 511Z DRIVER BIT A NO 2 25L 1 620 971 512Z DRIVER BIT A NO 3 25L 1 621 944 477 COTTER 1 622 982 684 CENTER PIN A 109L FOR CORE BIT D32 38 1 623 982 685 CENTER PIN B 104L FOR CORE BIT D45 90 1 624 982 672 CORE BIT A 25MM 1 625 982 673 CORE BIT A 29MM 1 626 982 674 CORE BIT A 32MM 1 INCLUD 627 627 982 686 GUIDE PLATE FOR COR...

Page 46: ...HUCK WRENCH 10G 1 660 302 975 ANCHOR SETTING ADAPTER A SDS W5 16X260L 1 661 303 621 ANCHOR SETTING ADAPTER A SDS W3 8X160L 1 662 302 974 ANCHOR SETTING ADAPTER A SDS W3 8X260L 1 663 302 979 ANCHOR SETTING ADAPTER B SDS W1 4X260L 1 664 302 978 ANCHOR SETTING ADAPTER B SDS W5 16X260L 1 665 303 622 ANCHOR SETTING ADAPTER B SDS W3 8X160L 1 666 302 977 ANCHOR SETTING ADAPTER B SDS W3 8X260L 1 667 303 3...

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