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Hitachi DH 24PM, Technical And Service Manual

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Hitachi DH 24PM Technical And Service Manual Download Page 4

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1. PRODUCT NAME

Hitachi Rotary Hammer, Model DH 24PM

2. MARKETING OBJECTIVE

The new Model DH 24PM is a 3-mode type rotary hammer based on the Model DH 24PC3 rotary hammer drill. It

can provide 3 modes of operation, "Rotation and hammering," "Rotation only" and "Hammering only."

In addition, the Model DH 24PM is equipped with a quick-release tool retainer that requires only two steps to

switch between the drill bit holder for use with SDS-plus bits and the drill chuck holder for drilling holes in steel

and wood easily and safely.

The main features of the Model DH 24PM are as follows:

(1) The tool retainer requires only two steps to switch between the drill bit holder for use with SDS-plus bits and

the drill chuck holder for drilling holes in steel and wood easily and safely.

(2) Class-top drilling speed

(3) More comfortable and frisky drilling

(4) Long service life and high durability thanks to the internal pressure adjustment mechanism

(5) Non-slip double-layer molded handle and gear cover

3. APPLICATIONS

(1) Rotation and hammering function (When the drill bit holder is mounted)

   Drilling anchor holes

Drilling holes in concrete, tile, brick and similar materials

(2) Rotation only function (When the drill chuck holder is mounted)

     Drilling holes in steel and wood

Tightening and loosening machine screws and wood screws

(3) Hammering only function (When the drill bit holder is mounted)

Light-duty chiselling of concrete

Groove digging and edging

[Typical applications]

 Air conditioning ................................... Installation of air conditioners, water coolers and heaters, and air ducts

 Piping and plumbing ........................... Installation of gas, water, and sanitary facilities

 Electrical work ..................................... Installation of light fixtures and various electric appliances

 Interior decoration ............................... Installation of seating, display stands and partitions

 Other civil engineering, construction and repair work

Summary of Contents for DH 24PM

Page 1: ...TECHNICAL DATA AND SERVICE MANUAL ROTARY HAMMER DH 24PM SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E496 Sep 2006 D MODEL DH 24PM Hitachi Power Tools ...

Page 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 HR2450T C BOSCH GBH2 26DFR B ...

Page 3: ...ndling Instructions 12 7 2 Caution Plate 12 8 REFERENCE MATERIAL 13 8 1 Lubrication 13 8 2 Tool Structure 13 8 3 Three mode Changeover Mechanism 18 8 4 Caution when Using Rotation Only No Hammering Function 20 8 5 Drill Bits 21 8 6 Chuck Section 22 8 7 Dust Collector B 22 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 24 9 1 Disassembly 24 9 2 Reassembly 30 9 3 Tightening Torque 33 9 4 Wiring Diagram...

Page 4: ...mfortable and frisky drilling 4 Long service life and high durability thanks to the internal pressure adjustment mechanism 5 Non slip double layer molded handle and gear cover 3 APPLICATIONS 1 Rotation and hammering function When the drill bit holder is mounted Drilling anchor holes Drilling holes in concrete tile brick and similar materials 2 Rotation only function When the drill chuck holder is ...

Page 5: ... chuck holder turn the lock grip to unlock then pull for prevention of inadvertent dropping To mount the drill bit holder or the drill chuck holder simply turn and push the lock grip in 4 1 2 Selectable from 3 modes Rotation and hammering Rotation only and Hammering only The new Model DH 24PM is a 3 mode type rotary hammer based on the Model DH 24PC3 rotary hammer drill It features the Hammering o...

Page 6: ... gear cover The double layer molded gear cover consists of a plastic resin base covered with a soft resin to ensure ease of operation and a non slip grip during chipping 4 1 8 Non slip double layer molded handle The double layer molded handle consists of a plastic resin base covered with a soft resin to ensure a soft touch and non slip grip 4 1 9 Compact body Entire length 351 mm The Model DH 24PM...

Page 7: ...rate 0 to 4 600 min 1 Housing Handle cover Gear cover AC single phase commutator motor Type of motor Model DH 24PM 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 resi...

Page 8: ...mm 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 fo...

Page 9: ...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 Rotation and hamme...

Page 10: ...de No 303626 4 Core bit shank SDS plus shank Core bit shank B Core bit outer diameter 25 38 mm 31 32 1 1 2 Core bit outer diameter 45 50 mm 1 25 32 2 Overall length 300 mm 11 52 64 Code No 303627 Standard sockets available on the market Bull point round type SDS plus shank Square bull point SDS plus shank E Crushing operations Hammering only Code No 303046 Code No 316656 Code No 316657 Code No 316...

Page 11: ...ength 50 mm For use with slotted head minus screw Stamped bit No Tip thickness Applicable screw dia mm 4 5 6 8 Bit No No 2 No 3 Code No 955654 955655 Applicable screw dia mm 4 5 6 Bit tip thickness Code No 955658 955673 I Grease for electric impact drill Containing 500 g 17 64 oz Code No 980927 Containing 30 g 1 06 oz Code No 981840 70 g 2 5 oz Code No 308471 Code No 971787 Code No 306885 J Dust c...

Page 12: ...ol retainer Double layer molding Provided Push button type 3 modes Changeover mode One push type 3 modes 3 modes 26 mm 800 W 0 900 min 1 rpm 0 900 min 1 rpm 2 9 kg 6 4 lbs 13 mm 407 mm 16 210 mm 8 1 4 30 mm 84 mm 3 5 16 Provided CB rotary type One push type B 24 mm 780 W 0 1 100 min 1 0 600 min 1 2 6 kg 5 7 lbs 13 mm 384 mm 15 1 8 204 mm 8 1 32 32 mm 72 mm 2 27 32 One push type Provided Lever type...

Page 13: ...0 6 2 Drilling Speed Comparison Drilling speed varies considerably depending on the work conditions Use the factory test results shown in Fig 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 ...

Page 14: ...erformance varies considerably depending on the work conditions Use the factory test results shown in Fig 2 for comparison purposes only Fig 2 Voltage supply Maker Model HITACHI DH 24PM B C 230 V 28 27 24 Chiseling amount kg 30 min 30 25 15 10 5 35 0 20 ...

Page 15: ...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 16: ...on of rotation Unlike conventional hammer drills the armature shaft in the Model DH 24PM 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 24PM more compact for easier handling and operation Thus the appearance of the Model DH 24PM is similar to that of an impact drill The rotation of the armature i...

Page 17: ...reciprocating bearing Finally a rod extending from the outer race of the reciprocating bearing is connected to the piston by a piston pin and causes the reciprocating motion of the piston Piston pin Second gear Second shaft Annular groove Key rail 2 pcs Clutch Fig 3 Piston Reciprocating bearing Armature Motor shaft Steel ball First gear Cylinder Bit holder Hammering function The piston reciprocate...

Page 18: ...orce at all is required to restart the hammering operation Piston Front cap Striker Cylinder Second hammer Moving distance Small piston vent hole Second gear Fig 4 First gear Coil spring Clutch claw Claw Air escape slot Reciprocating bearing Gear cover Air chamber O ring C Large piston vent hole Bit holder Slip mechanism The slip mechanism in the Model DH 24PM consists of a coil spring which appli...

Page 19: ... free change of the rotation speed and hammering force When drilling in fragile materials pull the switch trigger gently for low rotation speed hammering force to achieve optimum results Note that the switch trigger cannot be pulled to the full but up to the half in the reverse drilling and the speed is about half of the forward drilling In addition the switch stopper cannot be used in the reverse...

Page 20: ... steps are required to remove the lock grip for prevention of inadvertent dropping Lock grip Lock grip Mounting Turn the drill chuck holder or the drill bit holder in the direction indicated with an arrow on the lock grip until the spline is engaged Then push in the lock grip turning further Thus the drill chuck holder or the drill bit holder can be easily mounted without position adjustment After...

Page 21: ...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 22: ... 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 motor ...

Page 23: ... the figure is released and the cylinder rotates freely Simply turn the grip to adjust the tool to the desired position 8 4 Caution when Using Rotation Only No Hammering Function The drill chuck holder standard accessory is required for drilling holes in wood or metal materials The change lever of the Model DH 24PM permits changeover among Rotation only Rotation and hammering and Hammering only fu...

Page 24: ...ing 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 Regri...

Page 25: ...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 26: ...e 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 Drill bit length 166 mm ...

Page 27: ...35 from the rails in the Gear Cover Ass y 18 as shown in Fig 14 Pull out the Second Pinion 59 Clutch Spring 60 Clutch 61 Washer D 62 and the Lock Plate 58 these parts are sandwiched by means of the Lock Plate 58 as a unit as shown in Fig 15 from the end of the Second Shaft 63 Turn the Reciprocating Bearing 65 so that the Piston 53 is moved to its maximum upper position Inner Cover Ass y 56 side Th...

Page 28: ...3 Disassembly of the tool retainer Slide the Grip 4 fully in the arrow direction as shown in Fig 17 and remove the Front Cap 2 Pulling the Grip 4 as shown in Fig 18 remove the Stopper Ring 3 with a retaining ring puller Then the Grip 4 Ball Holder 5 Steel Ball D7 0 14 Holder Plate 6 and Holder Spring 7 can be removed from the Bit Holder 13 Front Cap 2 Stopper Ring 3 Ball Holder 5 Holder Plate 6 Ho...

Page 29: ...k holder Engage the chuck holder jig J 345 with the spline as shown in Fig 20 Hold the width across flats in a vise and remove Flat Hd Screw A Left Hand M6 x 25 26 Put a hexagonal bar in the Drill Chuck 13VLRH N W O Chuck Wrench 27 then loosen and remove it using a torque wrench Remove the Stopper 28 Then the chuck holder can be removed in the same manner as the bit holder Fig 20 Chuck holder jig ...

Page 30: ...support the end face of the gear cover on the gear cover jig J 344 and press the tip of the Cylinder 38 by tapping with a hand press as shown in Fig 21 If the Cylinder 38 is pressed excessively the gear cover will be deformed and the Cylinder 38 cannot be removed Be sure to tap with a hand press in order to remove the Cylinder 38 Gear cover jig J 344 Gear Cover Ass y 18 Cylinder 38 Fig 21 ...

Page 31: ... J 341 into the Cylinder 38 until it contacts the end surface of the Damper Holder 49 Hold the Cylinder 38 and the end surface of stopper ring jig A J 341 with a vise and compress Damper A 47 it moves a little when the Stopper Ring 50 is pressed with punch C J 341 Insert punch C J 341 into the 5 mm diameter hole 2 places in the Cylinder 38 and tap the outside of the Stopper Ring 50 until the Stopp...

Page 32: ...5 and fix the pinion sleeve puller to a vise Pull the Gear Cover Ass y 18 to remove the Pinion Sleeve 57 from the Gear Cover Ass y 18 Figs 23 and 24 Claws of pinion sleeve puller Pinion sleeve puller J 302 Hold with a vise Pinion sleeve puller J 302 Fig 23 Pinion Sleeve 57 Gear Cover Ass y 18 Pinion Sleeve 57 Adjuster Fig 24 ...

Page 33: ...y Molub Alloy No 777 1 grease to the contact portion between the Clutch 61 Washer D 62 and the Lock Plate 58 Fill Molub Alloy No 777 1 grease in the ball portion of the Reciprocating Bearing 65 Apply Hitachi Motor Grease No 29 to the O ring S 18 33 for the Change Lever 34 and the Steel Ball D7 0 14 2 Mounting the Cylinder 38 Mount the Second Hammer 43 O ring 1AP 20 44 Hammer Holder 45 O ring B 46 ...

Page 34: ...he Second Shaft 63 After press fitting the First Gear 66 check that the inside ring of the Reciprocating Bearing 65 turns smoothly 5 Mounting the oil seal Prior to reassembly apply grease to the inner circumference of the Oil Seal 21 However do not apply grease to its outer circumference Also when press fitting the Oil Seal 21 ensure that it is straight and level 6 Reassembly of the internal press...

Page 35: ...n the Lock Grip 11 turning in the arrow direction on the Lock Grip 11 as shown in Fig 29 and fix it with the Retaining Ring for D25 Shaft 8 If it is impossible to mount Washer B 9 to the fixing position of the Retaining Ring for D25 Shaft 8 remove Washer B 9 and check that the Sping 10 is inserted to the proper position Fig 19 Support Fig 28 Bit Holder 13 or Chuck Holder 29 Fig 29 Spring 10 Lock G...

Page 36: ...of the Gear Cover Ass y 18 contacts that of the Housing 83 At this time rotate the Grip 4 to check that the rotation of the Cylinder 38 is transmitted to the armature shaft Spring B 35 End surface of the Gear Cover Ass y 18 Rail in the Gear Cover Ass y 18 Gear Cover Ass y 18 Fig 31 Housing 83 Move the Piston 53 to the top dead center Position the wing portion of the Lock Plate 58 horizontally Enga...

Page 37: ... noise suppressor Reversing SW White Brown Black or brown Choke coil Choke coil Blue Black Red Speed control SW White or blue Cord ass y Noise suppressor Gray Stator Stator Reversing SW White Brown Black or brown Blue Black Red Speed control SW White or blue Cord ass y Gray Stator Stator ...

Page 38: ...rrangement and Wiring Work A Internal wire arrangement 1 Product with noise suppressor Choke Coil A Brown 84 Noise Suppressor 93 Brown Choke coil Black Stator Gray Stator White Stator Red Stator Blue Choke coil Black or brown White or blue White Stator ...

Page 39: ... 36 Fig 35 2 Product without noise suppressor Brown CB Black Stator Gray Stator White Stator Red Stator Blue CB Black or brown White or blue White Stator ...

Page 40: ...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 41: ... 50 Switch Cord Armature Ass y O ring P 22 Ball Bearing 608DD Ball Bearing 608VV Inner Cover Ass y Spring B Second Shaft Clutch Spring Clutch Reciprocating Bearing First Gear Ball Bearing 626VV Lock Plate Second Pinion 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 Gear Cover Ass y Oil Seal Ball Beari...

Page 42: ...100 2 3 4 5 6 7 11 8 9 10 12 14 15 16 17 18 19 20 21 22 23 24 36 37 26 27 28 12 8 9 10 29 30 31 32 33 34 35 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 55 56 64 54 69 70 71 72 73 74 75 76 77 78 79 80 76 81 82 83 84 85 86 87 88 89 90 91 92 90 93 94 96 97 98 99 95 67 68 57 58 59 60 61 63 65 66 13 11 503 501 502 ...

Page 43: ...L SEAL 1 22 322 815 SLEEVE 1 23 323 232 FELT PACKING B 1 24 690 4DD BALL BEARING 6904DDPS2L 1 25 326 271 CHUCK HOLDER ASS Y 1 INCLUD 8 12 15 16 26 30 26 995 344 FLAT HD SCREW A LEFT HAND M6X25 1 27 322 357 DRILL CHUCK 13VLRH N W O CHUCK WRENCH 1 28 326 527 STOPPER 1 29 326 526 CHUCK HOLDER 1 30 959 156 STEEL BALL D7 0 10 PCS 2 31 324 530 PUSHING BUTTON 1 32 317 223 PUSHING SPRING 1 33 878 885 O RI...

Page 44: ...PS2L 1 76 982 631 WASHER A 2 77 360 720U ARMATURE ASS Y 110V 120V 1 INCLUD 75 76 81 77 360 720E ARMATURE 220V 230V 1 77 360 720F ARMATURE 240V 1 78 324 531 FAN GUIDE 1 79 961 672 HEX HD TAPPING SCREW D4X50 2 80 340 635C STATOR 110V 120V 1 80 340 635E STATOR 220V 230V 1 80 340 635F STATOR 240V 1 81 608 VVM BALL BEARING 608VVC2PS2L 1 82 326 523 HITACHI PLATE 1 83 324 553 HOUSING 1 84 324 549 CHOKE C...

Page 45: ...84 750 TAPPING SCREW W FLANGE D4X16 2 98 324 554 HANDLE COVER 1 99 301 653 TAPPING SCREW W FLANGE D4X20 BLACK 3 100 500 390Z CORD 1 100 500 249Z CORD 1 FOR USA CAN 100 500 446Z CORD 1 FOR GBR 230V 100 500 454Z CORD 1 FOR GBR 110V 100 500 391Z CORD 1 FOR SUI 100 500 408Z CORD 1 FOR AUS NZL ...

Page 46: ...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 CORE...

Page 47: ...DS W1 4X260L 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 ...

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