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8-3. "Three-Mode" Changeover Mechanism

The change lever of the Model DH 24PF3 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

Spline of second shaft

Second gear

Change lever

Fig. 6

Clutch

A portion is meshed.
(Hammering transmitted.)

Second shaft

First gear

Reciprocating bearing

B portion is meshed.
(Rotation transmitted.)

Three claws of the second shaft

Pinion sleeve

Second pinion

Содержание DH24PF3

Страница 1: ...TECHNICAL DATA AND SERVICE MANUAL ROTARY HAMMER DH 24PF3 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E490 May 2005 D MODEL DH 24PF3 Hitachi Power Tools ...

Страница 2: ... DATA 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 HR2455 C BOSCH 11224VSR B ...

Страница 3: ...ONS IN SALES PROMOTION 13 7 1 Handling Instructions 13 7 2 Caution Plate 13 8 REFERENCE MATERIAL 14 8 1 Lubrication 14 8 2 Tool Structure 14 8 3 Three Mode Changeover Mechanism 19 8 4 Drill Bits 22 8 5 Chuck Section 23 8 6 Dust Collector B 23 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 25 9 1 Disassembly 25 9 2 Reassembly 29 9 3 Tightening Torque 32 9 4 Wiring Diagram 32 9 5 Internal Wire Arrangem...

Страница 4: ...essure 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 screws and wood screws wit...

Страница 5: ...ING POINTS Class top drilling speed More comfortable and frisky drilling New and powerful design Non slip double layer molded gear cover Non slip double layer molded handle Internal pressure adjustment mechanism ...

Страница 6: ...ioned according to the application 4 1 3 Class top drilling speed The drilling speed of the Model DH 24PF3 is 1 4 times higher than B and 1 2 times higher than C thanks to the efficient transmission of the hammering energy 4 1 4 More comfortable and frisky drilling The Model DH 24PF3 can drill holes more comfortably and friskily with a light pushing force because the quantity of body jumping is 20...

Страница 7: ... input Enclosure Full load blow 0 to 4 600 min Housing Handle cover Gear cover AC single phase commutator motor Type of motor Model DH 24PF3 13 mm 1 2 32 mm 1 1 4 Voltage V 120 Rotation speed Forward 0 to 1 150 min Reverse 0 to 550 min Type of switch Variable speed control switch and reversing switch D type handle of main body and side handle Type of handle Glassfiber reinforced polyamide resin gr...

Страница 8: ...m 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 Straight shank bit for impact drills 13 mm 1 2 hammer drill chuck SDS plus shank 13 mm hammer drill chuck For drilling operations when using a straight shank bit for impact dril...

Страница 9: ...nchor 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 type Code No 971799 971800 971801 971802 971803 C Large hole boring rota...

Страница 10: ...re bit shank B Core bit outer diameter 45 50 mm 1 25 32 2 Overall length 300 mm 11 52 64 Code No 303627 D Bolt placing operations with chemical anchor rotation hammering Standard sockets available on the market 12 7 mm 1 2 Chemical anchor adapter SDS plus shank 19 mm 3 4 Chemical anchor adapter SDS plus shank Part name 12 7 mm 1 2 Chemical anchor adapter 19 mm 3 4 Chemical anchor adapter Code No 3...

Страница 11: ...h 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 0 8 1 1 Cross recessed head Phillips bit Overall length 70 mm For use with cross recessed head Phillips screw 2 Slotted head minus bit ...

Страница 12: ...sed for reverse rotation 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...

Страница 13: ...hangeover switch Tool retainer Double layer molded handle Push button type 3 modes Changeover modes One push type 3 modes 3 modes HITACHI DH 24PF 24 15 16 720 0 1 150 0 4 600 2 5 5 5 lbs 13 1 2 420 16 1 2 147 5 51 64 32 1 1 4 69 2 23 32 Push button type One push type B 22 7 8 750 0 1 100 0 4 450 2 9 6 5 lbs 13 1 2 445 17 1 2 154 6 1 16 25 1 84 3 5 16 One push type 3 modes C 25 1 780 0 1 100 0 4 50...

Страница 14: ... 1 for comparison purpose only Fig 1 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 800 0 700 0 600 0 500 0 400 0 300 0 200 0 100 0 0 0 6 8 10 12 14 16 18 20 22 24 HITACHI DH 24PF3 B C HITACHI DH 24PF Drilling dia mm Drilling speed mm min ...

Страница 15: ...F B C 120 V 32 32 22 24 Chiseling amount kg 30 min 30 25 15 10 5 35 0 20 6 3 Chiseling Performance Comparison Chiseling performance varies considerably depending on the work conditions Use the factory test results shown in Fig 2 for comparison purposes only Fig 2 ...

Страница 16: ...ards the dangers 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 wit...

Страница 17: ...rotary hammers the armature shaft in the Model DH 24PF3 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 24PF3 more compact for easier handling and operation Thus the appearance of the Model DH 24PF3 is similar to that of an impact drill The rotation of the armature is transmitted to the second sha...

Страница 18: ...n parallel with the cylinder axis Referring to Fig 3 the armature s rotation is transmitted to the second shaft via the first gear The second shaft s rotation 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 inclin...

Страница 19: ...Model DH 24PF3 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 con...

Страница 20: ...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...

Страница 21: ... outside 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 ...

Страница 22: ...lutch 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 por...

Страница 23: ...n 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 motor side by s...

Страница 24: ...sed 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 ...

Страница 25: ...the bit from coming 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 regrin...

Страница 26: ...rface 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 of...

Страница 27: ... 24 Washer Steel ball D6 35 Fig 13 Dust collector B surface ...

Страница 28: ...pe 75 Remove Springs 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 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 ...

Страница 29: ...bly 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 Hol...

Страница 30: ...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...

Страница 31: ...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 ...

Страница 32: ...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...

Страница 33: ...he Second Shaft 52 After press fitting the First Gear 54 check that the inner 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 p...

Страница 34: ...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...

Страница 35: ... Arrangement and Wiring Work A Internal wire arrangement GRAY Pass over the ball bearing chamber 9 3 Tightening Torque Tapping Screws D4 64 81 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 ...

Страница 36: ...control switch as shown in Fig 30 and tighten the screw tightening torque 0 6 0 2 N m 6 2 kgf cm 5 2 1 7 in lbs Insert the lead wire gray coming from the stator into the terminal M1 and the lead wire red into the terminal M2 After the 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 ne...

Страница 37: ... 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 Gear...

Страница 38: ... E1 Hitachi Power Tools 44 45 46 70 71 72 73 74 75 73 501 502 503 77 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 76 78 79 82 80 81 14 22 ...

Страница 39: ...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 ...

Страница 40: ...N GUIDE 1 64 961 672 HEX HD TAPPING SCREW D4X50 2 65 340 637C STATOR 110V 120V 1 66 608 VVM BALL BEARING 608VVC2PS2L 1 67 324 588 HITACHI PLATE 1 68 324 589 HOUSING 1 69 324 536 SWITCH 1P PILLAR TYPE 1 70 322 853 PUSHING BUTTON 1 71 324 587 INTERNAL WIRE A BROWN 1 72 999 041 CARBON BRUSH 1 PAIR 1 73 955 203 BRUSH HOLDER 2 74 324 586 INTERNAL WIRE A BLUE 1 75 999 072 CARBON BRUSH AUTO STOP TYPE 1 P...

Страница 41: ...FT 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 CORE BIT 32MM 1 628 98...

Страница 42: ...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 1 667 303 332 HAMMER DR...

Страница 43: ... 6 ITEM NO CODE NO DESCRIPTION REMARKS NO USED 5 05 DH 24PF3 Printed in Japan 050520N ...

Страница 44: ......

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