Hitachi DH 20PB Technical Data And Service Manual Download Page 4

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1. PRODUCT NAME

Hitachi Hammer Drill (variable speed and reversing), Model DH 20PB

2. MARKETING OBJECTIVE

The Model DH 20PB has been developed based on the Model DH 24PB inheriting the reliable striking

mechanism. Thanks to the newly provided powerful motor, the Model DH 20PB has 20-mm drilling capacity (in

concrete) and the drilling speed is far faster than the competitors. The Model DH 20PB is an excellent cost/

performance hammer drill expected to expand our market share.

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 and wood screws (with chuck adapter)

[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 20PB

Page 1: ...POWER TOOLS TECHNICAL DATA AND SERVICE MANUAL HAMMER DRILL DH 20PB SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E462 Feb 2002 D MODELS DH 20PB ...

Page 2: ...L 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 BOSCH GBH2 20SRE B ...

Page 3: ...ns 10 8 REFERENCE MATERIAL 10 8 1 Lubrication 10 8 2 Tool Structure 10 8 3 Rotation Only and Rotation Striking Changeover Mechanism 13 8 4 Rotation Only no striking 14 8 5 Drill Bits 15 8 6 Chuck Section 16 8 7 Dust Collector B 16 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 18 9 1 Disassembly 18 9 2 Reassembly 20 9 3 Lubrication 20 9 4 Tightening Torque 20 9 5 Wiring Diagram 20 9 6 Internal Wire A...

Page 4: ...e 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 and wood screws with chuck adapter Typical applications Air conditioning Installation of air conditioners water coolers and heaters and air ducts Pipin...

Page 5: ... ensures more effective drilling into fragile materials such as tile and brick 5 Equipped with reversing switch By utilizing the newly designed optional accessory chuck adapter and appropriate driver bits and through the combined functions of the variable speed control switch and reversing switch the Model DH 20PB can be used to tighten and loosen a variety of screws The Model DH 20PB with gun typ...

Page 6: ...1 1 4 AC single phase 50 Hz or 60 Hz 0 1 000 min 1 0 750 min 1 0 4 200 min 1 AC single phase commutator motor Speed control switch with reversing switch Gun type handle of main body and side handle Housing Handle cover Gear cover 2 3 kg 5 1 lbs 4 6 kg 10 1 lbs Corrugated cardboard box with case 1 Case 1 2 Side handle 1 3 Depth gauge 1 Weight excludes cord and side handle Voltage V Current A Input ...

Page 7: ...gth mm 90 3 17 32 90 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 Straight shank bit for impact drills 13 mm 1 2 hammer drill chuck SDS plus sh...

Page 8: ...8 anchor setting adapter B C Large hole boring rotation striking Center pin core bit core bit shank and guide plate Guide plate Center pin Core bit Core bit shank SDS plus shank 1 Center pin Do not use bit with outer diameter of 25 mm 31 32 and 29 mm 1 5 32 Center pin A Center pin B Core bit outer diameter 32 35 38 mm 1 1 4 1 3 8 1 1 2 Core bit outer diameter 45 50 mm 1 25 32 2 Code No 982684 Code...

Page 9: ...lus 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 Crushing operation rotation striking Bull point round type only SDS plus shank Code No 303046 E Bolt placing operation with ch...

Page 10: ...he drill chuck onto the chuck adapter G Drill chuck adapter set SDS plus including a c b 13 mm 1 2 drill chuck 13VLR with chuck wrench 303820 303623 a Chuck adapter G for SDS plus shank system c Special screw M6 left hand threaded 950275 981122 1 Cross recessed head Phillips bit Overall length 70 mm For use with cross recessed head Phillips screw 2 Slotted head minus bit Overall length 50 mm For u...

Page 11: ...apter D for SDS plus shank type 13 mm 1 2 drill chuck 13VLA with chuck wrench Code No 303624 950272 NOTE The 13VLA drill chuck and chuck adapter D cannot be used 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 I Grease for electric impact drill Containing 500 g 1 1 lbs Code No 980927 C...

Page 12: ...12 17 32 318 12 17 32 334 13 5 32 360 14 3 16 185 7 9 32 185 7 9 32 205 8 1 16 72 2 27 32 72 2 27 32 79 3 1 8 2 3 5 1 Ibs 2 3 5 1 Ibs 2 3 5 1 Ibs 6 2 Drilling Speed Comparisons Drilling speed depends on the operating conditions The test results shown in Fig 1 are based on actual factory tests and are used as a reference only Fig 1 shows the drilling speed comparisons for downward drilling The dril...

Page 13: ...ive seal Special grease is used in the striking section Should the striking section within the gear cover be disassembled carefully remove the old grease from all parts and on reassembly insert 70 g 0 15 lbs of new grease into the gear cover Be careful not to exceed the designed amount of grease Excessive grease will reduce striking efficiency 8 2 Tool Structure While the structure is essentially ...

Page 14: ...allel with the cylinder axis Referring to Fig 2 the rotation of armature is transmitted to the second shaft via the first gear The second shaft rotation is further 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 inclinati...

Page 15: ... from that of conventional hammer drills When the drill bit is lifted from the concrete surface on completion of drilling the second hammer moves to the position indicated by the continuous lines in Fig 3 and the protruding lip portion at the tip of the striker is gripped by the o ring mounted on the inner wall of the cylinder In this state should the piston continue to move so that the small pist...

Page 16: ... possible operational trouble or a breakdown of the insulation Speed control The Model DH 20PB is equipped with a variable speed control switch which permits free change of the rotation speed and striking force When drilling fragile materials pull the switch trigger gently for low rotation speed striking force to achieve optimum results 8 3 Rotation Only and Rotation Striking Changeover Mechanism ...

Page 17: ... operation and Rotation Only operation is automatically obtained However since the Models DH 24PA and DH 24PB are equipped with a change lever for changeover between Rotation Striking and Rotation Only functions merely mounting the chuck adapter will not stop the striking action it is absolutely necessary to turn the change lever to the Rotation Only setting for drilling or driving screws Should t...

Page 18: ...ut this new structure 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 Cylinder 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 with a depth of 30 mm...

Page 19: ...h drill bits with overall length of 166 mm 160 mm or 110 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 rotate togeth...

Page 20: ...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 21: ...e Carbon Brushes 62 Remove Spring B 34 from the end of the Gear Shaft Set 35 and turn the Gear Shaft Set 35 so that the Piston 30 moves to its maximum upper position inner cover side The arm of the Reciprocating Bearing 40 can then be disconnected from the Piston Pin 31 and the Gear Shaft Set 35 and the components mounted on it can be removed from the Inner Cover 33 as a unit With a bearing puller...

Page 22: ...circumference of the O Ring I D 10 5 27 and pull it out As the O Ring I D 10 5 27 is employed to prevent idle striking please advise customers to replace it with a new one whenever it is disassembled Extract the Retaining Ring for D37 Hole 17 turn the Gear Cover 7 so that its tip portion is upward and use a hand press to extract the Ball Bearing 6904DDPS2L 16 from the Gear Cover 7 Next turn the Ge...

Page 23: ...ly grease to the inner circumference of the Oil Seal 14 However do not apply grease to its outer circumference Also when press fitting the Oil Seal 14 ensure it is straight and level 9 3 Lubrication Apply special grease N P C FG 6A Code No 980927 is recommended to the inner and outer circumferences of the Piston Pin 31 and Piston 30 O Ring A 29 mounted on the Striker 28 O Ring B 26 mounted on the ...

Page 24: ...om the Stator 49 Black from the Stator 49 Red from the Stator 49 Blue from the Carbon Brush 62 White from the Stator 49 Choke coil Noise Suppressor 60 Cord 72 Armature 46 Transparent neutral wire of Noise Suppressor 60 Speed Control Switch and Reversing Switch 59 Put the lead wires from the Stator 49 under the Brush Holder 63 Brush Terminal ...

Page 25: ...no abnormalities 110 V 127 V except U K products 9 8 No load Current Values After no load operation for 30 minutes the no load current value should be as follows Carbon brush Stator Black Blue White Brown Fig 14 Wiring of reversing switch Additional Wiring Work General internal wiring can be accomplished by referring to paragraphs 9 4 and 9 5 The following are special instructions for switch conne...

Page 26: ...ip Ball Holder Holder Spring Oil Seal Steel Ball Gear Cover Ball Bearing 6904DD Retaining Ring Armature Ass y Inner Cover O Ring Ball Bearing 608DD Washer A x2 Ball Bearing 608VV 60 min 50 Retaining Ring Cylinder Steel Ball x 4 Second Gear Spring A Washer A Retaining Ring Second Hammer O Ring B O Ring Housing Stator Spring B Gear Shaft Set Spacer Ball Bearing 626VV General Assembly ...

Page 27: ...l DH 20PB 2002 2 5 E1 E462 501 502 503 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 45 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 66 67 68 69 70 71 72 ...

Page 28: ...677 SECOND GEAR 1 22 301 678 SPRING A 1 23 301 679 WASHER A 1 24 948 310 RETAINING RING FOR D30 SHAFT 1 25 301 671 SECOND HAMMER 1 26 301 672 O RING B 1 27 301 680 O RING I D 10 5 1 28 315 148 STRIKER 1 29 301 670 O RING A 1 30 301 668 PISTON 1 31 301 666 PISTON PIN 1 32 303 977 WASHER C 1 33 314 880 INNER COVER 1 34 301 664 SPRING B 1 35 315 161 GEAR SHAFT SET 1 36 301 659 WASHER B 1 37 301 660 C...

Page 29: ...OL SWITCH 2P 100V 115V 1 59 314 921 SPEED CONTROL SWITCH 2P 220V 240V 1 60 994 273 NOISE SUPPRESSOR 1 61 302 488 EARTH TERMINAL 1 62 999 041 CARBON BRUSH 1 PAIR 1 62 999 072 CARBON BRUSH AUTO STOP TYPE 1 PAIR 1 63 955 203 BRUSH HOLDER 2 64 HITACHI LABEL 1 65 981 373 TUBE D 2 FOR CORD 66 315 147 DUST PACKING 1 67 314 922 CHOKE COIL A BLUE 1 68 314 923 CHOKE COIL A BROWN 1 69 984 750 TAPPING SCREW W...

Page 30: ...18 TAPER SHANK ADAPTER SDS PLUS NO 2 1 613 303 619 A TAPER SHANK ADAPTER SDS PLUS 1 614 303 620 B TAPER SHANK ADAPTER SDS PLUS 1 615 944 477 COTTER 1 616 303 332 HAMMER DRILL CHUCK SET 13MM 1 INCLUD 617 618 617 303 334 CHUCK HANDLE 1 618 303 335 RUBBER CAP 1 619 302 976 ANCHOR SETTING ADAPTER A SDS W1 4X260L 1 620 302 975 ANCHOR SETTING ADAPTER A SDS W5 16X260L 1 621 303 621 ANCHOR SETTING ADAPTER...

Page 31: ...D 650 650 982 690 GUIDE PLATE FOR CORE BIT 50MM 1 651 303 625 CORE BIT SHANK SDS PLUS 25 38MM 105L 1 652 303 626 CORE BIT SHANK SDS PLUS 25 38MM 300L 1 653 303 627 CORE BIT SHANK SDS PLUS 45 90MM 300L 1 654 303 046 BULL POINT SDS 250MM ROUND SHANK TYPE 1 655 303 044 CHEMICAL ANCHOR ADAPTER SDS 12 7MMX90L 1 656 303 045 CHEMICAL ANCHOR ADAPTER SDS 19 0MMX100L 1 657 303 820 DRILL CHUCK AND ADAPTER SE...

Page 32: ... 6 ITEM NO CODE NO DESCRIPTION REMARKS NO USED 2 02 Printed in Japan 020205N DH20PB ...

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