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Hitachi DH 22PB, Technical Data And Service Manual, Page: 5 / 38

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Hitachi DH 22PB Technical Data And Service Manual Download Page 5

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4. SELLING POINTS

Push-button type forward-
reverse changeover switch

Compact body

One-push tool retainer

Class-top drilling speed
Improved resistance to grease leakage
New and powerful design

4-1. Selling Point Descriptions

4-1-1. Class-top drilling speed

The drilling speed of the Model DH 22PB is 1.8 times higher than B and 1.4 times higher than D and 1.1 times

higher than C thanks to the efficient transmission of the hammering energy.

4-1-2. Improved resistance to grease leakage

The Model DH 22PB is equipped with a sealed type ball bearing at the tip of the bearing unit while the current

Model DH 24PB is equipped with an open type ball bearing.  In addition, the clearance around the bearing is

minimized to improve the resistance to grease leakage.

4-1-3. One-push tool retainer

The tool retainer of the current Model DH 24PB needs sliding the grip to mount the bit.  The one-push tool retainer

of the Model DH 22PB eliminates the need for sliding the grip to mount the bit (sliding the grip is required at

removal of the bit).

4-1-4. Push-button type forward-reverse changeover switch

The Model DH 22PB is equipped with the push-button type forward-reverse changeover switch that is more

convenient and reliable than the lever-type switch of the current Model DH 24PB.

Summary of Contents for DH 22PB

Page 1: ...TECHNICAL DATA AND SERVICE MANUAL ROTARY HAMMER DH 22PB SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E481 Aug 2004 D MODEL DH 22PB Hitachi Power Tools ...

Page 2: ...ND 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 HR2021 C BOSCH GBH2 22SRE B HILTI TE2 D ...

Page 3: ... 11 7 2 Caution Plate 11 8 REFERENCE MATERIAL 12 8 1 Lubrication 12 8 2 Tool Structure 12 8 3 Rotation Only and Rotation Hammering Changeover Mechanism 16 8 4 Rotation Only no hammering 16 8 5 Drill Bits 17 8 6 Chuck Section 18 8 7 Dust Collector B 18 9 PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY 20 9 1 Disassembly 20 9 2 Reassembly 22 9 3 Tightening Torque 23 9 4 Wiring Diagrams 24 9 5 Internal Wir...

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

Page 5: ... ball bearing at the tip of the bearing unit while the current Model DH 24PB is equipped with an open type ball bearing In addition the clearance around the bearing is minimized to improve the resistance to grease leakage 4 1 3 One push tool retainer The tool retainer of the current Model DH 24PB needs sliding the grip to mount the bit The one push tool retainer of the Model DH 22PB eliminates the...

Page 6: ...400 min 1 Housing Handle cover Gear cover AC single phase commutator motor Type of motor Model DH 22PB 13 mm 1 2 32 mm 1 1 4 Voltage V Current A Input W 110 5 9 120 5 4 220 3 0 230 2 8 240 2 7 620 Rotation speed Forward 0 to 1 050 min 1 Reverse 0 to 640 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 ...

Page 7: ...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...

Page 8: ...ame 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 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 con...

Page 9: ...k SDS plus shank Core bit shank A Core bit outer diameter 25 38 mm 31 32 1 1 2 Overall length 105 mm 4 1 8 Code No 303625 Overall length 300 mm 11 52 64 Code No 303626 Core 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 Crushing operation rotation hammering Bull point round type only SDS plus shank Code No 303046 E Bolt placing operation with...

Page 10: ...nd 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 13VLR with chuck wrench Special screw M6 left hand threaded Code No 303623 321814 981122 a b c 2 Slotted head minus bit Overall length 50 mm For use with slot...

Page 11: ...d 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 I Grease for electric impact drill Containing 500 g 1 1 lbs Code No 980927 Containing 30 g 0 07 lbs Code No 98184...

Page 12: ...cord and side handle mm 69 2 23 32 92 Function Forward reverse changeover switch Tool retainer Push button type 119 dB VL Full load vibration level Full load noise level dB A 2 modes Changeover modes One push type 2 modes 2 modes C 20 15 16 710 0 1 050 0 4 050 2 3 5 1 lbs 13 1 2 352 13 55 64 197 7 3 4 32 1 1 4 76 3 87 118 One push type 2 modes 22 7 8 500 0 1 100 0 3 900 2 3 5 1 lbs 13 1 2 332 13 5...

Page 13: ... 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 Drill bit dia mm Drilling speed mm min ...

Page 14: ...erent 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 of th...

Page 15: ...o enhance your understanding of the tool and its mechanisms Transmission of rotation Unlike conventional rotary hammers the armature shaft in the Model DH 22PB 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 22PB more compact for easier handling and operability Thus the appearance of the Model DH ...

Page 16: ...rallel 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 inclinat...

Page 17: ...f conventional rotary hammers 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 O ring C mounted between the hammer holder and the damper holder In this state should the piston continue to move so that the small pis...

Page 18: ...of 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 oper...

Page 19: ...entric pin of the change lever forces the clutch to move against the pressure of the clutch spring in the direction of the front cap so that it disengages from the claws on the reciprocating bearing and the reciprocating bearing stops rotating on the second shaft When the change lever is returned to the Rotation Striking mark position the force of the clutch spring presses the clutch back against ...

Page 20: ...ey slot two pieces Key rail 2 pcs Shape of SDS plus shank bit Ball holder Steel ball Section A A Cylinder 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 If reground before the end of its service life the drill bit will continue to provide efficient drilling Figure 5 shows the regrinding angle Regrinding ang...

Page 21: ...te surface 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 completi...

Page 22: ...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 7 Dust collector B structure Retaining ring for D30 shaft Seal cover Socket adapter B Drill bit length 110 mm ...

Page 23: ...mpting to pull them out first could cause the Armature 57 to be pulled out at the same time causing damage to the Carbon Brushes 66 Remove the Spacer 42 and Spring B 43 from the end of the Second Shaft 44 and turn the Second Shaft 44 so that the Piston 37 moves to its maximum upper position inner cover side The arm of the Reciprocating Bearing 48 can then be disconnected from the Piston Pin 40 and...

Page 24: ...Cylinder 22 from the Gear Cover 10 with a hand press Then the Sleeve 17 can be removed from the Cylinder 22 Remove the Retaining Ring for D30 Shaft 26 from the Cylinder 22 with a retaining ring puller Then the Second Gear 23 Spring A 24 and Washer A 25 can be removed from the Cylinder 22 4 Disassembly of the cylinder and the second hammer Remove the Stopper Ring 34 from the inside diameter portion...

Page 25: ...Reciprocating Bearing 48 rotary shaft of the Second Shaft 44 clutch claw of the Cylinder 22 inner circumference of the metal of the Inner Cover 39 Second Hammer 27 and the lip portion of the Oil Seal 16 Fill 50 g of the special grease in the gear cover and 10 g in the inner cover groove Apply Molub Alloy No 777 1 grease to the outer circumference of the Clutch 47 groove and the pin portion of the ...

Page 26: ... oil seal Prior to reassembly apply grease to the inner circumference of the Oil Seal 16 However do not apply grease to its outer circumference Also when press fitting the Oil Seal 16 ensure that it is straight and level 5 Mounting the piston Mount the Piston 37 facing its two 2 mm diameter holes to the Second Shaft 44 as shown in Fig 13 9 3 Tightening Torque Tapping Screw D3 x 10 68 0 7 0 2 N m 7...

Page 27: ...lack Red Brown Noise suppressor 1 Products with noise suppressor Fig 14 Blue Gray White Choke coil Cord Black Red Brown 2 Products without noise suppressor Fig 15 Stator Stator Stator Stator Forward reverse changeover switch Variable speed switch Forward reverse changeover switch ...

Page 28: ...ray Stator Brown Choke coil Choke Coil Blue 71 Choke Coil Brown 70 Noise Suppressor 74 Red Stator Black Stator 9 5 Internal Wire Arrangement and Wiring Work A Internal wire arrangement 1 Product with noise suppressor White Stator ...

Page 29: ... 26 Blue CB Fig 17 Gray Stator Brown CB Support B 72 Support B 72 Red Stator Black Stator White Stator 2 Product without noise suppressor ...

Page 30: ...r 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 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 near the terminals and pull out the lead wires Fig 18 Wiring of reversin...

Page 31: ...tch Cord Armature O ring P 22 Ball Bearing 608DD Ball Bearing 608VV Inner Cover Spring B Second Shaft Clutch Spring Clutch 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 Cover Oil Seal Bal...

Page 32: ...Hitachi Power Tools 1 10 12 21 22 23 24 25 26 27 28 29 30 31 32 34 35 36 37 38 52 53 54 56 55 57 58 59 60 56 61 62 63 501 68 67 69 66 81 78 76 77 79 80 64 65 70 70 71 73 74 75 44 45 46 47 48 49 50 51 43 42 39 40 41 13 11 14 15 2 3 4 5 6 7 8 9 72 71 72 502 503 504 16 17 18 19 20 33 ...

Page 33: ...NG RING 37MM 1 21 959 156 STEEL BALL D7 0 10 PCS 1 22 322 814 CYLINDER 1 23 301 677 SECOND GEAR 1 24 301 678 SPRING A 1 25 301 679 WASHER A 1 26 948 310 RETAINING RING FOR D30 SHAFT 1 27 322 803 SECOND HAMMER 1 28 944 486 O RING 1AP 20 1 29 322 804 HAMMER HOLDER 1 30 322 802 O RING B 1 31 322 805 DAMPER A 1 32 322 808 O RING C 1 33 322 806 DAMPER HOLDER 1 34 322 807 STOPPER RING 1 35 322 801 STRIK...

Page 34: ...KE COIL BROWN 1 FOR NZL AUS GBR 230V EUROPE FIN NOR SWE DEN SUI KOR CHN 70 322 821 INTERNAL WIRE BROWN 1 FOR VEN USA CAN 70 322 828 CHOKE COIL BROWN 1 FOR TPE GBR 110V 71 322 829 INTERNAL WIRE BLUE 1 71 322 830 CHOKE COIL BLUE 1 FOR NZL AUS GBR 230V EUROPE FIN NOR SWE DEN SUI KOR CHN 71 322 822 INTERNAL WIRE BLUE 1 FOR VEN USA CAN 71 322 831 CHOKE COIL BLUE 1 FOR TPE GBR 110V 72 322 823 SUPPORT B ...

Page 35: ...HKG 77 500 391Z CORD 1 CORD ARMOR D8 8 FOR SUI 77 500 454Z CORD 1 CORD ARMOR D8 8 FOR GBR 110V 77 500 446Z CORD 1 CORD ARMOR D8 8 FOR GBR 230V 77 500 456Z CORD 1 CORD ARMOR D8 8 FOR CHN 78 937 631 CORD CLIP 1 79 984 750 TAPPING SCREW W FLANGE D4X16 2 80 301 653 TAPPING SCREW W FLANGE D4X20 BLACK 2 81 322 837 HANDLE COVER 1 ...

Page 36: ... CHUCK 13VLD D 1 611 971 511Z DRIVER BIT A NO 2 25L 1 612 971 512Z DRIVER BIT A NO 3 25L 1 613 944 477 COTTER 1 614 982 684 CENTER PIN A 109L FOR CORE BIT D32 38 1 615 982 685 CENTER PIN B 104L FOR CORE BIT D45 90 1 616 982 672 CORE BIT A 25MM 1 617 982 673 CORE BIT A 29MM 1 618 982 674 CORE BIT A 32MM 1 INCLUD 619 619 982 686 GUIDE PLATE FOR CORE BIT 32MM 1 620 982 675 CORE BIT A 35MM 1 INCLUD 62...

Page 37: ... ANCHOR SETTING ADAPTER B SDS W3 8X260L 1 650 303 332 HAMMER DRILL CHUCK SET 13MM 1 INCLUD 651 652 651 303 334 CHUCK HANDLE 1 652 303 335 RUBBER CAP 1 653 303 617 TAPER SHANK ADAPTER SDS PLUS NO 1 1 654 303 618 TAPER SHANK ADAPTER SDS PLUS NO 2 1 655 303 619 A TAPER SHANK ADAPTER SDS PLUS 1 656 303 620 B TAPER SHANK ADAPTER SDS PLUS 1 657 981 122 SPECIAL SCREW M6X22 1 658 303 627 CORE BIT SHANK SD...

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