Hitachi DH 25PA Technical Data And Service Manual Download Page 1

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POWER TOOLS

TECHNICAL DATA

AND

SERVICE MANUAL

HAMMER DRILL

DH 25PA, DH 25PB

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST Nos. DH 25PA: E453

DH 25PB: E454

Nov. 1999

MODELS

DH 25PA
DH 25PB

Summary of Contents for DH 25PA

Page 1: ...WER TOOLS TECHNICAL DATA AND SERVICE MANUAL HAMMER DRILL DH 25PA DH 25PB SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST Nos DH 25PA E453 DH 25PB E454 Nov 1999 D MODELS DH 25PA DH 25PB ...

Page 2: ...AL DATA AND SERVICE MANUAL a symbol s is are used in the place of company name s and model name s of our competitor s The symbol s utilized here is are as follows Symbols Utilized Competitors Company Name Model Name MAKITA HR2010 C ...

Page 3: ...DH 25PA and DH 25PB Hammer Drills 15 8 4 Rotation Only and Rotation Striking Changeover Mechanism DH 25PB only 17 8 5 Rotation Only no striking DH 25PB only 17 8 6 Drill Bits 18 8 7 Chuck Section 19 8 8 Dust Collector B 19 Service Section 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 21 9 1 Disassembly 21 9 2 Reassembly 24 9 3 Tightening Torque 25 9 4 Wiring Diagrams 26 9 5 Wiring Work 27 9 6 Insula...

Page 4: ...his series includes the single mode operation hammer drill Model DH 25PA equipped with a Rotation Striking function which is based on the Model DH 25PB 3 APPLICATIONS 1 Rotation and striking 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 a...

Page 5: ...13 7 8 Weight 3 1 kg 6 8 lbs B Overall length 287 mm 11 5 16 Weight 3 1 kg 6 8 lbs Variable speed control switch Fast drilling speed About 20 faster than the Model DH 20V when the pressing force is 10 kgf Powerful 650 W motor DH 25V 600 W DH 20V 460 W Soft touch handle Rotation Striking Rotation only dual mode DH 25PB only Rotation Striking single mode DH 25PA NOTE The Model DH 25PA does not have ...

Page 6: ...l DH 20V power consumption was raised to 650 W by improving the winding specifications and the motor cooling efficiency These are powerful hammer drills that are also compact and lightweight 4 1 3 Variable speed control switch The variable speed control switch allows the rotation speed to be changed freely throughout the drilling operation This permits easy centering and positioning and ensures mo...

Page 7: ...000 min AC single phase commutator motor Variable switch D type handle and side handle Materials Gear cover Crank case Aluminum alloy die casting silver Cylinder case Housing green Handle cover gray Handle Glassfiber reinforced Tail cover polyamide resin black Grip Rotation and striking 3 4 kg 7 5 lbs 3 3 kg 7 3 lbs 5 9 kg 13 0 lbs 6 0 kg 13 2 lbs Rotation and striking Rotation only Corrugated car...

Page 8: ...0 3 17 32 Code No 306369 306368 Code No 306370 Adapter for slender shaft 1 Drill bit taper shank Outer dia mm 11 7 16 12 3 31 64 12 7 1 2 14 3 9 16 14 5 73 128 17 5 11 16 Code No 944460 944461 993038 944462 944500 944463 Type Morse taper No 1 Code No 303617 Code No 944477 3 Cotter 2 Taper shank adapter 21 5 27 32 944464 Morse taper No 2 303618 Straight shank bit for impact drills 13mm 1 2 Hammer d...

Page 9: ... W 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 Internal cone type Code No Part name Code No 971794 971795 971796 971797 971798 971799 971800 971801 971802 971803 External cone type Manual hammer W 1 4 Anchor setting adapter B W 5 16 Anchor setting adapter B W 3 8 Anchor setting adapter B W...

Page 10: ...1 4 Core bit shank SDS plus shank Core bit shank A Core bit shank B Core bit outer diameter 25 38 mm 31 32 1 1 2 Overall length 105 mm 4 1 8 Overall length 300 mm 11 52 64 Core bit outer diameter 45 90 mm 1 25 32 3 9 16 Overall length 300 mm 11 52 64 Code No 303625 Code No 303626 Code No 303627 D Bolt placing operations with chemical anchor rotation striking Standard sockets available on the marke...

Page 11: ...ly for drilling holes in steel and wood DH 25PB only Drill chuck 13VLA Chuck adapter D SDS plus shank Chuck adapter D for SDS plus shank type 13 mm 1 2 Drill chuck 13VLA with chuck wrench Part name Code No 303624 950272 Chuck wrench ...

Page 12: ...50 mm For use with slotted head minus screw Stamped bit No Tip thickness Bit No No 2 No 3 Code No 955654 955655 Applicable screw dia mm 3 5 6 8 Bit tip thickness 0 8 1 Code No 955658 955673 Applicable screw dia mm 4 5 6 H Drilling screws rotation only DH 25PB only Plus Phillips driver bit overall length 25 mm for cross recessed head Phillips screws Bit No Chuck adapter D SDS plus shank Bit No No 2...

Page 13: ... 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 J Dust cup dust collector B Dust collector B ass y Code No 306885 ...

Page 14: ...1 2 32 1 1 4 20 25 32 13 1 2 15 19 32 25 1 13 1 2 20 25 32 13 1 2 24 15 16 650 650 460 520 600 0 1 100 0 1 100 0 900 0 800 0 900 0 800 0 800 0 700 0 650 0 735 0 4 000 0 4 000 0 3 500 0 3 150 0 4 000 89 89 92 85 82 1 mode 2 modes 2 modes 2 modes 1 mode SDS plus shank SDS plus shank SDS plus shank Round shank SDS plus shank Round shank SDS plus shank Round shank 318 12 1 2 318 12 1 2 320 12 19 32 35...

Page 15: ...eference only The drill bits which used in the test are the Hitachi genuine SDS plus shank bits 0 6 8 10 12 14 Drill bit dia mm Drilling speed mm min 16 18 20 22 25 100 200 300 400 500 600 700 C DH 25PA DH 25PB DH 25V DH 20V Pressing force 98 N 10 kgf Test material Concrete panel with a compression strength of 2352 N cm2 240 kgf cm2 Fig 1 Drilling speed comparisons downward drilling ...

Page 16: ...ower 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 Hammer Drill 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 of the Handling Instructions to be able ...

Page 17: ...ase and 17 5 g in the Crank Case on the Connecting Rod side Take care not to overfill the grease as an excessive amount of grease can cause hammering failure The gear change section in the Gear Cover uses Hitachi Motor Grease No 29 for power tools Supply with 60 g of this grease Do not use the special grease used for the hammering section or it will leak into the motor parts and result in a failur...

Page 18: ...n of the third gear is then transmitted to the cylinder threaded onto the third gear Rotation of the cylinder is transmitted to the retainer sleeve coupled together by means of three needle pins and then to the drill bit inserted into the retainer sleeve by way of two key rails and a steel ball which hold the bit Striking function Rotation of the armature is transmitted to the crank shaft and the ...

Page 19: ...comparison with the conventional mouth system that practically no pressing force at all is required to restart the striking operation Cylinder Travel distance Striker Air escape slot O ring Second hammer Retainer sleeve Tool shaft Fig 3 Slip mechanism A clutch plate holding a steel ball is inserted between the second gear and the spring plate as a slip mechanism in the Models DH 25PA and DH 25PB I...

Page 20: ...aft via the two steel balls in the groove of the first gear When the change lever is set to the Rotation Only position the eccentric pin of the change lever pushes up the clutch shaft and the steel balls fall in the groove Thus the first gear idles on the crank shaft When the change lever is returned to the Rotation Striking position the force of the spring in the crank shaft presses the clutch sh...

Page 21: ...this new design reduces damage to the shank of the drill bit and extends the service life of the chuck section Ball holder Key rail two pieces Key slot two pieces Section A A Steel ball Retainer sleeve A A Shape of SDS plus shank bit Section of the chuck section Fig 4 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 ...

Page 22: ...use with drill bits with overall lengths of 110 mm 160 mm or 166 mm and cannot be used with any longer bits When using a drill bit with an overall length of 166 mm with dust collector B drilling up to a depth of approximately 72 mm is possible When using dust collector B ensure it is securely fastened to the grip on the main body with socket adapter B Although the socket and socket adapter B rotat...

Page 23: ...ructure Approx 72 mm 2 27 32 Approx 16 mm 5 8 Drill bit length 166 mm Drill bit length 110 mm Grip on the main body side Socket adapter B Socket Outer race D6 35 Steel ball Washer Retaining ring for D30 shaft Dust cover Seal cover ...

Page 24: ...rom the Crank Case 46 46 Remove the Connecting Rod 9 9 from the Crank Shaft 47 47 to remove the Piston 7 7 from the Crank Case 46 46 Lightly tap the Cylinder 2 2 with a plastic hammer to remove the Striker 3 3 If the Striker 3 3 is hard to be removed push the Piston 7 7 connected with the Connecting Rod 9 9 in the Cylinder 2 2 and pull it out with a jerk Then the Striker 3 3 can be pulled out toge...

Page 25: ...ction of this O Ring 20 20 fit a Special Repair Tool J 201 Spring Hook H 75 J 201 onto the outer circumference of the O Ring 20 20 and pull it out As the O Ring 20 20 is employed to prevent idle striking please advise customers to replace it with new one whenever it is disassembled Be careful not to lose the three Needle Pins 1 1 and the three Needles 16 16 4 Disassembly of the Gear and the Crank ...

Page 26: ... inserted at the inner part of the Retainer Sleeve 15 15 which is designed to catch and grip the striker to prevent idle hammering As shown in Fig 11 fit the Spring Hook J 201 onto the O Ring 20 20 from the outer circumference of the O Ring 18 18 and pull it out 140 45 1 2 dia 1 Snap ring pliers J 200 Code No 970976 Fig 9 All dimensions in millimeters 217 R2 2 Spring hook J 201 Code No 970977 Fig ...

Page 27: ...16 to make reassembly work easier 2 Mounting the First Gear DH 25PB only Insert the Clutch Spring 53 and the Clutch Shaft 54 from the constricted side into the hole of the Crank Shaft 47 Apply power tool grease No 29 to the side hole of the crank shaft and then insert the Steel Ball D4 76 48 Insert a steel bar of about 10 mm diameter having flat ends into the First Gear 51 Pressing the Clutch Shaf...

Page 28: ...x 20 Black 83 93 1 96 N m 20 kgf cm Tapping Screw W Flange D4 x 12 Black 81 1 96 N m 20 kgf cm Seal Lock Screw W SP Washer M4 x 12 52 52 1 96 N m 20 kgf cm Seal Lock Screw W SP Washer M4 x 8 70 1 96 N m 20 kgf cm Oil Cap 12 12 2 94 0 49 N m 30 5 kgf cm 2 Special grease Although the newly developed grease light yellow is used in the Models DH 25PA and DH 25PB the conventional grease for hammer dril...

Page 29: ...or Variable switch Black Cord 2 C2 M2 Black Black Noise suppressor CR unit Stator Choke coil Choke coil Stator Black Armature Fig 12 M1 C1 1 2 Products without noise suppressor Variable switch Black Black M1 C1 1 2 C2 M2 Stator Stator Armature Cord Fig 13 ...

Page 30: ...e lead wire black into the terminal M2 Insert each lead wire black coming from the Noise Suppressor 79 89 into the terminals C1 and C2 After the insertion pull each lead wire slightly to check that the lead wires do not come off To disconnect the lead wires insert a small flat blade screwdriver into the windows near the lead wires and pull out the lead wires Noise Suppressor Noise Suppressor Stato...

Page 31: ...0 V Megohm Tester Dielectric strength AC 4 000 V 1 minute with no abnormalities 220 V 240 V and 110 V for U K products AC 2 500 V 1 minute with no abnormalities 110 V 127 V except for U K products 9 7 No Load Current Value After no load operation for 30 minutes the no load current value should be as follows Voltage V Current A Max 6 2 5 9 5 7 5 4 3 1 3 0 2 8 240 230 220 127 120 115 110 ...

Page 32: ... First Gear Clutch Spring Clutch Shaft Handle 60 min 50 Third Pinion Ball Bearing 6001DDCMPS2L Second Gear Clutch Plate Spring Plate Ball Bearing 608VVC2PS2L Housing Ass y Stator Ass y DH 25PA Gear Cover Armature Ass y Ball Bearing 6000DDCMPS2L Ball Bearing 626VVC2PS2L Connecting Rod Striker O Ring x 2 Piston Oil Seal Retainer Sleeve Second Hammer Ball Bearing 6906 Cylinder Steel Ball Crank Case G...

Page 33: ... 30 Assembly Diagram for DH 25PA ...

Page 34: ...BB BALL BEARING 6906 1 24 992 906 URETHANE RING 1 25 980 891 PIPE 1 26 318 028 FRONT CAP 1 27 318 029 GRIP 1 28 318 030 BALL HOLDER 1 29 306 342 HOLDER SPRING 1 30 984 118 WASHER B 1 31 318 021 CYLINDER CASE 1 32 992 253 HEX SOCKET HD BOLT W FLANGE M5X25 4 33 HITACHI LABEL 1 34 992 914 THIRD PINION 1 35 600 1DD BALL BEARING 6001DDCMPS2L 1 36 992 503 WASHER 1 37 992 928 SECOND GEAR 1 38 971 087 STO...

Page 35: ... 68 340 451K STATOR ASS Y 220V 240V 1 INCLUD 60 69 992 500 WASHER A 1 70 986 812 HOUSING ASS Y 1 INCLUD 64 71 71 938 477 HEX SOCKET SET SCREW M5X8 2 72 318 018 HANDLE 1 73 980 900 PLATE 1 74 305 558 TAPPING SCREW W FLANGE D5X25 BLACK 2 75 981 373 TUBE D 2 FOR CORD 76 953 327 CORD ARMOR D8 8 1 76 938 051 CORD ARMOR D10 1 1 77 993 880 SEAL LOCK SCREW W WASHERS M5X25 2 78 318 033 SWITCH B 1 79 994 27...

Page 36: ...RILL BIT SDS PLUS D5 5X110 1 608 303 577 DRILL BIT SDS PLUS D6 0X110 1 609 303 579 DRILL BIT SDS PLUS D6 0X160 1 610 303 580 DRILL BIT SDS PLUS D6 4X160 1 611 303 581 DRILL BIT SDS PLUS D6 5X160 1 612 303 582 DRILL BIT SDS PLUS D7 0X160 1 613 303 583 DRILL BIT SDS PLUS D7 5X160 1 614 303 584 DRILL BIT SDS PLUS D8 0X160 1 615 303 585 DRILL BIT SDS PLUS D8 5X160 1 616 303 586 DRILL BIT SDS PLUS D9 0...

Page 37: ...RILL BIT D14 3X110 1 653 944 500 TAPER SHANK DRILL BIT D14 5X110 1 654 944 463 TAPER SHANK DRILL BIT D17 5X120 1 655 944 464 TAPER SHANK DRILL BIT D21 5X140 1 656 303 617 TAPER SHANK ADAPTER SDS PLUS NO 1 1 657 303 618 TAPER SHANK ADAPTER SDS PLUS NO 2 1 658 944 477 COTTER 1 659 302 976 ANCHOR SETTING ADAPTER A SDS W1 4X260L 1 660 302 975 ANCHOR SETTING ADAPTER A SDS W5 16X260L 1 661 303 621 ANCHO...

Page 38: ...8MM 1 694 982 689 GUIDE PLATE FOR CORE BIT 45MM 1 695 982 690 GUIDE PLATE FOR CORE BIT 50MM 1 696 982 691 GUIDE PLATE FOR CORE BIT 65MM 1 697 982 692 GUIDE PLATE FOR CORE BIT 80MM 1 698 982 693 GUIDE PLATE FOR CORE BIT 90MM 1 699 982 684 CENTER PIN A 109L FOR CORE BIT D32 38 1 700 982 685 CENTER PIN B 104L FOR CORE BIT D45 90 1 701 303 625 CORE BIT SHANK SDS PLUS 25 38MM 105L 1 702 303 626 CORE BI...

Page 39: ... 36 Assembly Diagram for DH 25PB ...

Page 40: ...BB BALL BEARING 6906 1 24 992 906 URETHANE RING 1 25 980 891 PIPE 1 26 318 028 FRONT CAP 1 27 318 029 GRIP 1 28 318 030 BALL HOLDER 1 29 306 342 HOLDER SPRING 1 30 984 118 WASHER B 1 31 318 021 CYLINDER CASE 1 32 992 253 HEX SOCKET HD BOLT W FLANGE M5X25 4 33 HITACHI LABEL 1 34 992 914 THIRD PINION 1 35 600 1DD BALL BEARING 6001DDCMPS2L 1 36 992 503 WASHER 1 37 992 928 SECOND GEAR 1 38 971 087 STO...

Page 41: ...ING 1 72 959 148 STEEL BALL D3 175 10 PCS 1 73 992 912 O RING S 8 1 74 302 140 CHANGE LEVER ASS Y 1 INCLUD 73 75 992 911 FAN GUIDE 1 76 340 451H STATOR ASS Y 110V 1 INCLUD 63 FOR GBR 110V 76 340 451F STATOR ASS Y 220V 1 INCLUD 63 FOR THA 76 340 451K STATOR ASS Y 220V 240V 1 INCLUD 63 77 992 500 WASHER A 1 78 986 812 HOUSING ASS Y 1 INCLUD 67 79 79 938 477 HEX SOCKET SET SCREW M5X8 2 80 318 031 TAI...

Page 42: ...ARKS 601 303 571 DRILL BIT SDS PLUS D4 0X110 1 602 303 572 DRILL BIT SDS PLUS D4 3X110 1 603 303 573 DRILL BIT SDS PLUS D4 5X110 1 604 303 574 DRILL BIT SDS PLUS D4 8X110 1 605 303 575 DRILL BIT SDS PLUS D5 0X110 1 606 303 578 DRILL BIT SDS PLUS D5 0X160 1 607 303 576 DRILL BIT SDS PLUS D5 5X110 1 608 303 577 DRILL BIT SDS PLUS D6 0X110 1 609 303 579 DRILL BIT SDS PLUS D6 0X160 1 610 303 580 DRILL...

Page 43: ...BIT SDS PLUS D22 0X250 1 647 308 486 DRILL BIT SDS PLUS D24 0X250 1 648 303 616 DRILL BIT SDS PLUS D25 0X450 1 649 303 619 A TAPER SHANK ADAPTER SDS PLUS 1 650 303 620 B TAPER SHANK ADAPTER SDS PLUS 1 651 303 624 CHUCK ADAPTER D SDS PLUS 1 652 944 460 TAPER SHANK DRILL BIT D11X100 1 653 944 461 TAPER SHANK DRILL BIT D12 3X110 1 654 993 038 TAPER SHANK DRILL BIT D12 7X110 1 655 944 462 TAPER SHANK ...

Page 44: ...38MM 1 INCLUD 700 693 982 677 CORE BIT B 45MM 1 INCLUD 701 694 982 678 CORE BIT B 50MM 1 INCLUD 702 695 982 679 CORE BIT B 65MM 1 IMCLUD 703 696 982 680 CORE BIT B 80MM 1 INCLUD 704 697 982 681 CORE BIT B 90MM 1 INCLUD 705 698 982 686 GUIDE PLATE FOR CORE BIT 32MM 1 699 982 687 GUIDE PLATE FOR CORE BIT 35MM 1 700 982 688 GUIDE PLATE FOR CORE BIT 38MM 1 701 982 689 GUIDE PLATE FOR CORE BIT 45MM 1 7...

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