DH 22PG - hitachi
Contents
1. Voltage V 110 120 220 230 240 Current A max 3 0 2 8 1 6 1 5 1 4 25 STANDARD REPAIR TIME UNIT SCHEDULES MODEL Fixed Variable 10 20 30 40 50 60 min DH22PG General Assembly Work Flow Handle Cover Cord Armor Front Cap Grip Ball Holder Holder Spring Steel Ball D7 0 Switch Cord Lever O ring 1AP 10 Stopper Striker O ring A Thrust Washer Thrust Plate Spring B Piston O ring A Piston Pin Washer A Armature Ass y O ring S 24 Ball Bearing 609DD Ball Bearing 608VV Inner Cover Ass y Second Shaft Clutch Reciprocating Bearing Needle Cage First Gear Ball Bearing 626VV Housing Stator Second Hammer O ring B O ring P 15 Hammer Holder Gear Cover Cylinder Second Gear Spring A 26 LIST NO E497 Hitachi Power Tools ELECTRIC TOOL PARTS LIST ROTARY HAMMER 2007 4 E1 Model DH 22PG CODE NO 306 345 DESCRIPTION FRONT CAP REMARKS DH 22PG 306 340 STOPPER RING 325 597 GRIP 327 879 BALL HOLDER 324 526 322 812 HOLDER PLATE HOLDER SPRING 327 873 GEAR COVER 305 490 TAPPING SCREW W FLANGE D4X30 BLACK NAME PLATE 965 469 944 274 RETAINING RING FOR D25 SHAFT WASHER 327 875 STOPPER 872 654 O2. FAN GUIDE 981 824 HEX HD TAPPING SCREW D4X45 340 701C STATOR 110V 120V 340 701E 340 701F STATOR 220V 230V STATOR 240V 982 631 WASHER A 608 VVM BALL BEARING 608VVC2PS2L HITACHI LABEL 327 881 324 537 HOUSING INTERNAL WIRE A BROWN N FOR VEN THA INA SYR SIN HKG KUW USA CAN IND 324 549 CHOKE COIL A BROWN EXCEPT FOR VEN THA INA SYR SIN HKG KUW USA CAN IND 322 853 324 551 PUSHING BUTTON CHOKE COIL A BLUE EXCEPT FOR VEN THA INA SYR SIN HKG KUW USA CAN IND 324 538 INTERNAL WIRE A BLUE FOR VEN THA INA SYR SIN HKG KUW USA CAN IND 955 203 999 041 BRUSH HOLDER CARBON BRUSH 1 PAIR 324 536 SWITCH 1P PILLAR TYPE 953 327 CORD ARMOR D8 8 938 051 CORD ARMOR D10 1 930 039 NOISE SUPPRESSOR EXCEPT FOR VEN THA INA SYR SIN HKG KUW USA CAN IND 937 631 CORD CLIP 984 750 TAPPING SCREW W FLANGE D4X16 500 390Z CORD CORD ARMOR D8 8 500 447Z 500 424Z CORD CORD ARMOR D8 8 FOR SYR CORD ARMOR D8 8 FOR SIN KUW 500 235Z CORD ARMOR D8 8 FOR INA IND 500 239Z CORD ARMOR D10 1 FOR THA 930 055 CORD ARMOR D10 1 FOR VEN 500 408Z 500 249Z CORD ARMOR D8 8 FOR NZL AUS CORD ARMOR D8 8 FOR USA CAN 500 446Z CORD ARMOR D8 8 FOR GBR 230V
3. T marks 4 Press fitting the First Gear 40 Press fit the First Gear 40 aligning with the shaft end surface of the Second Shaft 36 After press fitting the First Gear 40 check that the inside ring of the Reciprocating Bearing 38 turns smoothly 18 5 Reassembly of the internal pressure adjustment mechanism As shown in Fig 13 push Felt Packing A 43 Valve 44 and Felt Packing B 45 in the Inner Cover Ass y 33 as far as they will go in this order Lui away ER NNT Valve 44 Felt Packing A 43 Inner Cover Ass y 33 6 Mounting the Piston 30 Mount the Piston 30 as shown in Fig 14 At this time mount the Thrust Plate 28 aligning the change lever pocket of the Inner Cover Ass y 33 with the notch of the Thrust Plate 28 See Fig 15 Spring B 29 Inner Cover Ass y 33 Thrust Plate 28 Piston 30 P ol Striker 25 1 4 Il Second Shaft 36 Spacer 35 Clutch 37 O ring A 26 Needle Cage 39 Reciprocating Bearing 38 Washer B D12 5 41 First Gear 40 19 Change lever pocket Thrust Plate 28 Inner Cover Ass y 33 7 Tightening torque Tapping Screw D4 8 52 69 72 1 47 2 45 Nem 15 25 kgfecm o Machine Screw M4 x 5 15 0 39 0 78 Nem 4 8 kgfecm 8 Wiring diagrams 1 Produc
4. 500 465Z CORD ARMOR D8 8 FOR GBR 110V 500 391Z CORD ARMOR D8 8 FOR SUI 500 440Z 500 456Z CORD CORD ARMOR D8 8 FOR CHN 323 974 CORD CORD ARMOR D10 1 FOR TPE 500 475Z CORD CORD ARMOR D8 8 FOR KOR 327 882 HANDLE COVER 301 653 TAPPING SCREW W FLANGE D4X20 BLACK N ALTERNATIVE PARTS STANDARD ACCESSORIES DESCRIPTION CODE NO 327 883 CASE REMARKS DH 22PG 324 548 SIDE HANDLE 303 709 DEPTH GAUGE 310 331 DEPTH GAUGE FOR USA CAN OPTIONAL ACCESSORIES CODE NO 308 471 DESCRIPTION GREASE FOR HAMMER HAMMER DRILL 70G REMARKS 980 927 GREASE FOR HAMMER HAMMER DRILL 500G 981 840 GREASE A FOR HAMMER HAMMER DRILL 30G 321 814 DRILL CHUCK 13VLRB D INCLUD 605 995 344 971 511Z FLAT HD SCREW A LEFT HAND M6X25 DRIVER BIT A NO 2 25L 971 512Z DRIVER BIT A NO 3 25L 981 122 SPECIAL SCREW M6X22 971 794 ANCHOR SETTING ADAPTER A W1 4 MANUAL 971 795 971 796 ANCHOR SETTING ADAPTER A W5 16 MANUAL ANCHOR SETTING ADAPTER A W3 8 MANUAL 971 797 ANCHOR SETTING ADAPTER A W1 2 MANUAL 971 798 ANCHOR SETTING ADAPTER A W5 8 MANUAL 971 799 ANCHOR SETTING ADAPTER B W1 4 MANUAL 971 800 971 801 ANCHOR S
5. Accordingly rotation of the second shaft is not transmitted to the reciprocating bearing and the reciprocating bearing stops to stop the striking motion of the piston and the striker The pressing force of spring B is as low as 1 0 kg to 2 0 kg in comparison with the conventional mouth system The Model DH 22PG is also suitable for drilling in upward direction Piston Tool shaft r 1 ETAT TAN Second gear Clutch Cylinder flange Reciprocating bearing Needle beari eedle bearing 11 O Internal pressure adjustment mechanism An air passage is provided as shown in Fig 4 to let out air inside the gear cover and let 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 grease leakage Fig 4 A A Inside the Gear cover Air passage Outside the Gear cover prima O Slip mechanism The slip mechanism in the Model DH 22PG consists of a coil spring which applies a pre set amount of pressure to ensure the interlocking of three claws provided on the flange of the cylinder the final rotating shaft and three matching claws provided on the face of the second gear by which rotation is transmitted to the cylinder The second gear is fitted on the cylinder with a certain amount of play If an excessively large torqu
6. Tool retainer section 14 7 Dust collector 15 REPAIR GUIDE 16 1 Precautions in disassembly and 16 STANDARD REPAIR TIME UNIT SCHEDULES rr TM 26 Assembly diagram for DH 22PG SELLING POINT DESCRIPTIONS Q Most compact and lightweight in its class Based on our own research The Model DH 22PG is most compact and lightweight in its class thanks to the optimum striking mechanism Maker HITACHI Model DH 22PG Overall length Weight 1 9 kg 289 mm Internal pressure adjustment mechanism An air passage is provided as shown below to let out air inside the gear cover and let outside air in the gear cover This passage is sandwiched between felt packings to pass only air Thus variations in the internal pressure are minimized for stable hammering operation and prevention of grease leakage A A Inside the Gear cover Air passage Outside the Felt packing A Inner cover dle striking prevention mechanism When the drill bit is lifted from the concrete surface the reciprocating bearing that converts rotation into reciprocating
7. arm of the Reciprocating Bearing 38 can be removed from the Piston Pin 34 and the components mounted on the Second Shaft 36 can be removed from the Inner Cover Ass y 33 as a unit Remove the First Gear 40 from the Second Shaft 36 with a bearing puller and remove the Reciprocating Bearing 38 Needle Cage 39 and Clutch 37 from the Second Shaft 36 Note that the First Gear 40 is aligned with and press fitted onto the 9 mm diameter end surface of the Second Shaft 36 16 3 Removal of the Cylinder 19 and the Second Gear 17 slip mechanism section Remove the Machine Screw M4 x 5 15 securing the Lever 14 to the Stopper 12 from the inside of the Gear Cover 7 Pull out the Lever 14 from the Gear Cover 7 Then the Stopper 12 can be removed Push the tip of the Cylinder 19 to remove the Cylinder 19 from the Gear Cover 7 Remove the Retaining Ring for D25 Shaft 10 from the Cylinder 19 with a retaining ring puller Then the Second Gear 17 Spring A 16 and Washer 11 can be removed from the Cylinder 19 4 Removal of the Cylinder 19 and the Second Hammer 20 Remove the Stopper Ring 24 from the inner circumference of the Cylinder 19 Then the Hammer Holder 23 Second Hammer 20 and O ring P 15 22 can be removed from the Cylinder 19 As shown in Fig 11 insert punch A J 85 into the 4 mm dia hole 2 pcs of the Cylinder 19 and tap the Stopper Ring 24 until the Stopper R
8. continuously strike against the end of the second hammer At the same time the changing air pressure within the air chamber which moves the striker also provides an air cushion which absorbs the impact of the hammering action As any air leakage from the air chamber would weaken the air cushion effect and reduce impact absorption the O ring mounted on the striker is extremely important to seal the air Although special rubber material is utilized in construction of the O ring to make its effective service life as long as possible wear cannot be fully avoided Accordingly it is recommended that the O ring be replaced approximately once a year depending on the frequency of usage of the tool O Idle striking prevention mechanism The idle striking prevention mechanism in the Model DH 22PG is different from those of conventional hammer drills in other classes When the drill bit is lifted from the concrete surface on completion of drilling or during no load operation the reciprocating bearing that converts rotation into reciprocating motion stops to prevent idle striking Upon lifting the drill bit from the concrete surface the tool shaft cylinder is moved forward about 5 mm by the force of spring B as shown in Fig 3 Then the clutch is moved forward by the thrust plate that is connected to the cylinder to disengage the clutch from the reciprocating bearing Thanks to the needle bearing on the second shaft the reciprocating bearing can idle
9. motion stops to prevent idle striking Thanks to this mechanism vibration and noise during no load operation are reduced 1 Specifications Capacity Concrete SPECIFICATIONS Capacity Steel Wood Input power Impact energy o load rpm Forward o load rpm Reverse ull Load bpm Mode Variable speed Reverse switch type Push button Handle Gear cover No No 289 11 3 8 No load vibration level Tri axial measured Full load vibration level Tri axial measured No load noise level measured Full load noise level measured Weight 2 2 Optional accessories 1 Drilling anchor holes rotation and hammering Drill bit SDS plus shank Overall length Overall Effective Overall Effective length length Code No outer dia length length Code No mm mm mm mm mm mm 303592 100 166 12 5 303571 4 0 303607 200 260 12 5 303572 303593 100 166 12 7 303573 50 110 303608 200 260 12 7 303574 303594 13 0 303575 303595 100 166 14 0 303578 100 160 5 0 303596 14 3 303576 7 346 303609 200 260 14 3 303577 6 0 303597 100 166 14 5 303579 303610 200 260 14 5 303580 303598 100 166 15 0 303581 303599 16 0 303582
10. 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 Competitors Symbols utilized i Company name Model name B BOSCH GBH2 22RE C MAKITA HR2020 CONTENTS Page SELLING POINT DESCRIPTIONS mmm 1 SPECIFICATIONS er rr eee nn eee eee zena nn nnn rn rn eee 2 1 Specifications 2 2222222222222 JJ 2 2 Optional accessories JJ 3 COMPARISONS WITH SIMILAR PRODUCTS eo rn nn nn nn nn TM 7 1 Specifications comparisons aaa 7 2 Drilling speed 8 PRECAUTIONS IN SALES PROMOTION e mamma 9 see 9 REFERENCE MATERIALS nr nn nnn rr nn n 10 1 Lubrication 10 2 Tool structure JJJ 10 3 Changeover between Rotation only and Rotation and hammering 13 4 Precautions for use of Rotation only no hammering function 13 5 Drill bits 13 6
11. 2 Reassembly of the Cylinder 19 section Mount the O ring P 15 22 Second Hammer 20 O ring B 21 and Hammer Holder 23 in the Cylinder 19 as shown in Fig 12 Push the new Stopper Ring 24 in the Cylinder 19 at an angle and fit it in the groove with a hand press using the stopper ring jig J 234 Check that the Stopper Ring 24 is securely fitted in the groove of the Cylinder 19 viewing from the 4 mm dia hole 2 pcs on the Cylinder 19 Stopper ring groove 4 mm dia hole 2 pcs O ring P 15 22 Second Hammer 20 Cylinder 19 2 Z een ZA gt Stopper ring jig J 234 ring B 21 Stopper Ring 24 Hammer Holder 23 3 Mounting the Lever 14 Mount the Second Gear 17 Spring A 16 and Washer 11 to the Cylinder 19 and secure them with the Retaining Ring for D25 Shaft 10 Push this assembly in to the tip of the Gear Cover 7 and mount the Holder Spring 6 Holder Plate 5 and Steel Ball D7 0 18 to the tip of the Cylinder 19 Mount the Ball Holder 4 Grip 3 Stopper Ring 2 and Front cap 1 Mount the Thrust Washer 27 to the Cylinder 19 Show the Lever 14 in the Gear Cover 7 and fit the Stopper 14 in the groove of the Lever 14 then push the Lever 14 in the Gear Cover 7 hard Secure the Lever 14 to the Gear Cover 7 with the Machine Screw M4 x 5 15 When assembling the component parts be sure to set the Lever 14 to rotation and hammering
12. 303611 200 260 16 0 303583 100 160 100 303600 16 5 303584 303601 17 0 303585 308485 200 260 17 0 303586 303602 100 166 17 5 303587 303612 200 260 17 5 303588 10 0 303603 100 166 18 0 303604 200 260 10 0 303613 200 260 19 0 303589 100 160 10 5 303614 20 0 303605 200 260 10 5 303590 22 0 303615 303591 303606 3 Slender bit and adapter for slender shaft SDS plus shank 4 po 1 Drill bit slender shaft 2 Adapter for slender shaft SDS plus shank 1 Drill bit Slender shaft 2 Adapter for slender shaft Outer dia Overall length Effective length Code No Code No mm mm 306369 90 45 306368 306370 Drill bit taper shank SI J 1 Drill bit taper shank 2 Taper shaft adapter SDS plus shank Y 3 Cotter 1 Drill bit taper shank 2 Taper shank adapter 3 Cotter Outer dia mm Code No Type Code No Code No 11 944460 12 3 944461 12 7 993038 14 3 944462 Morse taper No 1 303617 944477 14 5 944500 17 5 944463 13 mm hammer drill chuck Rubber cap Straight shank bit for J 13 mm hammer drill chuck impact drills SDS plus shank Chuck wrench 4 Code No 303332 303334 303335 Part name 13 mm hammer drill chuck including chuck wrench and rubber cap Chuck wrench Rubber cap 2 Anchor s
13. ETTING ADAPTER B W5 16 MANUAL ANCHOR SETTING ADAPTER B W3 8 MANUAL 971 802 ANCHOR SETTING ADAPTER B W1 2 MANUAL 971 803 ANCHOR SETTING ADAPTER B W5 8 MANUAL 944 477 COTTER 303 046 302 976 BULL POINT SDS 250MM ROUND SHANK TYPE ANCHOR SETTING ADAPTER A SDS W1 4X260L 302 975 ANCHOR SETTING ADAPTER A SDS W5 16X260L 303 621 ANCHOR SETTING ADAPTER A SDS W3 8X160L 302 974 ANCHOR SETTING ADAPTER A SDS W3 8X260L 302 979 302 978 ANCHOR SETTING ADAPTER B SDS W1 4X260L ANCHOR SETTING ADAPTER B SDS W5 16X260L 303 622 ANCHOR SETTING ADAPTER B SDS W3 8X160L 302 977 ANCHOR SETTING ADAPTER B SDS W3 8X260L 303 334 CHUCK HANDLE 930 515 303 332 CHUCK WRENCH 10G HAMMER DRILL CHUCK SET 13MM INCLUD 632 633 303 334 CHUCK HANDLE 303 335 RUBBER CAP 321 813 DRILL CHUCK 13VLD D 320 859 303 617 SYRINGE BLOW OUT BULB TYPE TAPER SHANK ADAPTER SDS PLUS NO 1 303 618 TAPER SHANK ADAPTER SDS PLUS NO 2 303 619 A TAPER SHANK ADAPTER SDS PLUS 303 620 B TAPER SHANK ADAPTER SDS PLUS A 303 624 303 623 CHUCK ADAPTER G SDS PLUS j j L Lol n n A n A j j j ALTERNATIVE PARTS OPTIONAL ACCESSORIES DH 22PG CODE NO DESCRIPTION REMARKS 321 825 DRILL CHUCK AND ADA
14. Hitachi Power Tools TECHNICAL DATAAND SERVICE MANUAL LIST No E497 Aug 2007 PRODUCT NAME Hitachi Rotary Hammer Model DH 22PG MARKETING OBJECTIVE _ 00000 D The new Model DH 22PG features the concrete drilling capability with the maximum drill bit diameter 22 mm and the use of SDS plus shank tools This is a professional use and low priced rotary hammer The main features of the Model DH 22PG are as follows 1 Most compact and lightweight in its class 289 mm in overall length and 1 9 kg in weight 2 The internal pressure adjustment mechanism prevents grease leakage 3 The idle striking prevention mechanism prevents reciprocating motion during no load operation to reduce noise APPLICATIONS reete 0 e Drilling holes in concrete brick and stone e Drilling holes in steel and wood e Tightening and loosening machine screws and wood screws SELLING POINTS NEW FEATURES 0 Most compact and lightweight in its class for ease of operation Hitachi s own internal pressure adjustment ISS mechanism Clutch cut type idle striking prevention mechanism SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT HITACHI Hitachi Koki Co Ltd International Sales Division REMARK For more information about HANDLING INSTRUCTIONS visit our website at http www hitachi koki com manual_view_export Throughout this TECHNICAL DATA AND SERVICE MANUAL a symbol
15. PTER SET INCLUD 604 642 306 369 DRILL BIT SLENDER SHAFT D3 4X90 306 368 DRILL BIT SLENDER SHAFT D3 5X90 306 370 ADAPTER FOR SLENDER SHAFT SDS PLUS 944 460 SHANK DRILL BIT D11X100 944 461 TAPER SHANK DRILL BIT D12 3X110 993 038 TAPER SHANK DRILL BIT D12 7X110 944 462 TAPER SHANK DRILL BIT D14 3X110 944 500 SHANK DRILL BIT D14 5X110 944 463 SHANK DRILL BIT D17 5X120 944 464 TAPER SHANK DRILL BIT D21 5X140 971 787 DUST CUP 931 844 STOPPER 306 885 DUST COLLECTOR B ASS Y 306 910 SOCKET ADAPTER B 986 802 DUST COLLECTOR ASS Y 986 803 DUST COVER 986 804 SEAL COVER 948 310 RETAINING RING FOR D30 SHAFT 958 063 WASHER 959 150 STEEL BALL D6 35 10 PCS 986 805 OUTER RACE 986 806 SOCKET INCLUD 656 657 INCLUD 658 664 h k k h lt k k h k k 6 07 ALTERNATIVE PARTS 5 ITEM CODE NO DESCRIPTION NO REMARKS DH 22PG Printed in Japan 6 07 070604N
16. RING 1AP 10 325 594 LEVER 949 213 306 334 MACHINE SCREW M4X5 10 PCS SPRING A 306 333 SECOND GEAR 959 156 STEEL BALL D7 0 10 PCS 327 876 CYLINDER 327 877 301 672 SECOND HAMMER O RING B 311 814 O RING P 15 327 878 HAMMER HOLDER 306 340 STOPPER RING 325 601 306 326 STRIKER O RING A 327 880 THRUST WASHER 325 588 THRUST PLATE 306 976 SPRING B 306 324 328 660 PISTON WASHER 327 870 O RING A 327 869 INNER COVER ASS Y INCLUD 43 45 306 322 PISTON PIN 325 587 327 871 SPACER SECOND SHAFT 325 584 CLUTCH 325 585 RECIPROCATING BEARING 306 320 NEEDLE CAGE 327 872 995 634 FIRST GEAR WASHER B D12 5 626 VVM BALL BEARING 626VVC2PS2L 324 543 FELT PACKING A 324 545 VALVE 324 544 878 609 FELT PACKING B O RING S 24 306 312 FRINGER 609 DDC BALL BEARING 609DDC3PS2 L 958 915 WASHER A 360 798U 360 798E ARMATURE ASS Y 110V 120V ARMATURE 220V 230V b A ASA dai Ni ii dalai gt INCLUD 47 49 ALTERNATIVE PARTS 54 55 PARTS CODE NO 360 798F DESCRIPTION ARMATURE 240V REMARKS DH 22PG 327 868
17. e is applied to the tool shaft cylinder the force of the torque will exceed the pressure of the coil spring and cause the claws on the second gear to disengage from and ride over the claws on the cylinder so that the second gear idles and does not transmit rotation Even should the drill bit come in contact with a reinforcing bar within the concrete causing sudden excessive torque the slip mechanism functions to prevent damage to the gears and possible loss of control of the tool by the operator slip torque setting applied to the tool shaft 1 7 to 2 2 kgm O 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 operation of the chuck portion The speed control switch is also fully dustproof to prevent dust and chips from entering the handle section and causing possible operational trouble or a breakdown of the insulation O Speed control The Model DH 22PG is equipped with a variable speed control switch which permits 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 can
18. ead minus screw For use with cross recessed head Phillips screw i B8 3 Tip thickness Stamped bit No Applicable screw Bit tip thickness Code No dia mm 0 8 955659 4 1 955674 5 6 Code No Applicable screw dia mm 983006 3 5 983011 6 8 Temporary tightening 5 Grease for hammer and hammer drill O Containing 30 g Containing 70 g Y U T C c Code No 980927 Code No 981840 Code No 308471 Containing 500 g ice 6 Dust cup and dust collector B Dust collector B Code No 971787 Code No 306885 Dust cup COMPARISONS WITH SIMILAR PRODUCTS Superior specifications 1 Specifications comparisons Maker HITACHI B c Model name DH22PG mm 22 22 20 Capacity Concrete Inch 7 8 7 8 13 16 mm 13 24 13 30 13 32 Capacity Steel Wood Inch 1 2 1 1 2 1 3 16 1 2 1 1 4 Input power W 620 620 710 Impact energy J 1 4 2 2 2 2 No load rpm Forward min 0 1 500 0 1 000 0 1 050 No load rpm Reverse min 0 980 0 1 000 0 525 Full load bpm min 0 6 200 0 4 400 0 4 050 Mode 2 2 2 Variable speed Yes Yes Yes Reverse switch type Push button CB holder Switch Lever Handle No Yes No Soft grip d No No No cover mm 289 342 352 Overall length Inch 11 3 8 11 15 32 13 55 64 No load vibration level 1 42 12 4 87 Tri axia
19. ere is grease leakage due to a defective seal Changing grease is required once a year to extend the service life of the tool Special grease is used in the striking section Should the striking section within the gear cover be disassembled remove the old grease from all parts completely and on reassembly replenish 30 g of new grease in the gear cover and 10 g in the groove of the inner cover Be careful not to exceed the designated amount of grease Excessive grease will reduce striking efficiency 2 Tool structure Transmission of rotation See Fig 2 The rotation of the armature is transmitted to the second shaft via the first gear and causes it to rotate The second shaft pinion mounted on the second shaft engages with the second gear mounted on the outer circumference of the cylinder The cylinder is coupled to the second gear by means of a slip mechanism and they rotate together The end of the cylinder also functions as the drill bit retainer The cylinder is key connected to the inserted drill bit by means of two key rails and a steel ball and transmits rotation to the drill bit O Piston reciprocating mechanism In the Model DH 22PG through adoption of a spiral drive system a mechanism using a reciprocating bearing a more compact design has been achieved by arranging the motor shaft in parallel with the tool shaft Figure 2 shows that the drill bit is pressed against the workpiece and the tool shaft is retracted The rotation of
20. etting Anchor setting bar Anchor setting adapter SDS plus shank Part name Overall length mm Code No Part name Overall length mm Code No W 1 4 Anchor setting adapter A 260 302976 W 1 4 Anchor setting adapter B 260 302979 W 5 16 Anchor setting adapter A 260 302975 W 5 16 Anchor setting adapter B 260 302978 W 3 8 Anchor setting adapter A 160 303621 W 3 8 Anchor setting adapter B 160 303622 W 3 8 Anchor setting adapter A 260 302974 W 3 8 Anchor setting adapter B 260 302977 Internal cone type External cone type 3 Crushing operation rotation and hammering Bull point SDS plus shank Code No 303046 13 mm drill chuck 13VLRB D Chuck adapter G SDS plus shank Special screw NOTE If the tool is to be used for tightening or loosening screws open the three jaws of the drill chuck and 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 5 Part name Code No Chuck adapter G 303623 13 mm drill chuck with chuck wrench 321814 981122 Special screw M6 left hand threaded 1 Cross recessed head Phillips bit 2 Slotted head minus bit Overall length 65 mm Overall length 70 mm For use with slotted h
21. he tool retainer is structured as shown in Fig 7 The tip of the tool retainer is covered with the front cap made of rubber to prevent dust and chips from getting inside The steel ball falls into the round groove of the bit to prevent the tool from coming off and the two key rails transmit the rotation torque To mount the bit push the bit in the tool retainer as far as it will go Pushing lightly turn the bit until it is caught At this position push the bit in as far as it will go sliding the grip is not required for mounting the bit To remove the bit slide the grip backward to the full and remove the bit Stopper ring Cylinder Holder plate Key rail 2 pes 14 7 Dust collector B When drilling holes overhead dust collector B optional accessory can be mounted on the Model DH 22PG to prevent dust and chips from falling downward Dust collector B is intended solely for use when drilling holes in concrete and cannot be used for drilling holes in steel or wood It is designed for use with drill bits with overall length of 166 mm 160 mm and 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 socket adapter B rotates together with the tool shank there is a stee
22. ing 24 cannot be seen from the 4 mm dia hole 2 pcs to remove the Stopper Ring 24 from the groove of the inner circumference of the Cylinder 19 Then pull out the Stopper Ring 24 from the inner circumference of the Cylinder 19 with a retaining ring puller B J 341 being careful not to pop out the Stopper Ring 24 At reassembly replace the Stopper Ring 24 with new one as the removed Stopper Ring 24 is deformed Tap with a hammer Punch A J 85 Hammer Holder 23 Stopper Ring 24 17 Reassembly Reassembly can be accomplished by following the disassembly procedure in reverse However special attention should be given to the following items 1 Application of lubricant Apply special grease to the lip portion of the oil seal in the Gear Cover 7 inner circumference of the needle bearing clutch claws of the Second Gear 17 and the Cylinder 19 inner circumference of the needle bearing in the Inner Cover Ass y 33 O ring B 21 of the Second Hammer 20 O ring P 15 22 O ring A 26 of the Striker 25 inner and outer circumference of the Piston 30 Washer 31 claw portion of the Clutch 37 claw portion inner circumference and arm portion of the Reciprocating Bearing 38 and O ring 1AP 10 13 of the Lever 14 Fill 30 g of special grease in the Gear Cover 7 and 10 g in the groove of the Inner Cover Ass y 33 Apply Hitachi Motor Grease No 29 to the Steel Ball D7 0 18
23. l measured Full load vibration level ile 8 75 16 8 16 2 Tri axial measured No l load noise level dB 83 7 91 3 87 7 measured Full I Load noise level dB 89 2 87 1 85 0 measured kg 1 9 2 3 2 3 Weight lbs 4 2 5 1 5 1 Internal pressure _ No No adjustment mechanism No load hammering No No prevention mechanism 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 HITACHI DH22PG B C E E E E o o Q 10 12 Drill bit dia mm Test conditions e Direction Downward drilling Pushing force 98 N 10 kgf e Test material Concrete panel with a compression strength of 2 352 N cm 240 kgf cm 8 PRECAUTIONS IN SALES PROMOTION Safety Instructions In the interest of promoting the safest and most efficient use of the Model DH 22PG Rotary hammer by all of our customers it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes the importance of the contents of the Handling Instructions and fully understands the meaning of the precautions listed on the Caution Plate and Name Plate attached to each tool A Handling Instructions Although every effort is made in each ste
24. l ball between the outer race and the socket which serves as a ball bearing Should the dust cover be forced against the concrete surface it will not rotate even though the tool shank continues to rotate Should the tool be operated when the dust cover is not being held against a concrete surface friction 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 tuning 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 the drilling operation the customer should be advised to always wear protective glasses When dust collector B is disassembled for repair or maintenance be very careful to prevent oil or grease from adhering to the steel balls Grease or oil on the steel balls may cause concrete dust to enter the unit and cause defective rotation Dust collector B structure Approx 72 mm 2 27 32 Approx 16 mm 5 8 Grip on the main s u1121 12 yyrT1 Drill bit 1 length 166 mm 5 LUE A body side Drill bit 27 IMI length 110mm Socket adapter Seal cover Socket Dust cover Retaining ring for D30 shaft Outer race Washer Steel Ball D6 35 15 REPAIR GUIDE Be sure to disc
25. not 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 drilling 12 Changeover between Rotation only and Rotation and hammering The change lever on the Model DH 22PG permits easy changeover between the rotation only and rotation and hammering functions Set the change lever to rotation and hammering T marks Press the drill bit against the workpiece and pull the switch trigger Then the armature starts rotating and the rotation and the striking force are transmitted to the drill bit by the mechanism as described in page 10 Piston reciprocating mechanism After drilling take the drill bit away from the workpiece Then the rotation of the reciprocating bearing and the hammering operation are stopped by the idle striking prevention mechanism as described in page 11 Set the change lever to rotation only ark The stopper of the change lever contacts the rear surface of the thrust plate that is pushed forward by spring B Thus the cylinder cannot go back even if the main body is pressed and the claws on the clutch cannot engage the matching claws on the reciprocating bearing The reciprocating bearing idles on the second shaft and only the rotation is transmitted to the drill bit 4 Precautions for use of Rotation only no hammering function The Model DH 22PG i
26. onnect the power cord plug from the wall outlet before repairing Otherwise the motor turns abruptly and it is very dangerous 1 Precautions in disassembly and reassembly The Bold numbers in the description below correspond to the item numbers in the Parts List and the exploded assembly diagram for the Model DH 22PG Disassembly 1 Disassembly of the tool retainer Slide the Grip 8 fully in the arrow direction as shown in Fig 9 and remove the Front Cap 1 Pulling the Grip 3 in the arrow direction as shown in Fig 10 remove the Stopper Ring 2 with a retaining ring puller Then the Grip 3 Ball Holder 4 Steel Ball D7 0 18 Holder Plate 5 and Holder Spring 6 can be removed from the Cylinder 19 Grip 3 7 rip 3 Holder Spring 6 Steel Ball D7 0 18 Cylinder 19 Stopper Ring 2 Front Cap 1 Holder Plate 5 Ball Holder 4 2 Disassembly of the hammering mechanism Set the Lever 14 to rotation and hammering T marks Remove the Tapping Screw W Flange D4 x 30 Black 8 from the Gear Cover 7 to remove the Gear Cover 7 At this time check that the Spacer 35 at the tip of the Second Shaft 36 is not adhered to the ball bearing press fitted into the Gear Cover 7 Remove the Spacer 35 from the tip of the Second Shaft 36 and move the Piston 30 to the top dead center Inner Cover Ass y 33 side by turning the Second Shaft 36 Then the
27. p of design manufacture and inspection to provide protection against safety hazards the dangers inherent in the use of any electric 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 the Handling Instructions to be able to offer appropriate guidance to the customer during sales promotion B Caution Plate The Model DH22PG unit is provided with a Caution Plate illustrated below which lists basic safety precautions in use Carefully ensure that the customer fully understands and follows these precautions before using tool For Australia and New Zealand CAUTION Read thoroughly HANDLING INSTRUCTIONS before use For the U S A and Canada WARNING To reduce the risk of injury user Ksa must read and understand instruction manual Mi AVERTISSEMENT Afin de r duire le risque de blessures l utilisateur doit lire et bien comprendre le mode d emploi For China ta RAB a FASE AHAB For Mexico ADVERTENCIA Lea las instruciones de manejo antes de usar For Taiwan R e i RATE at AS REFERENCE MATERIALS 1 Lubrication Replenish the grease lubricant when the tool is disassembled or th
28. river into the windows near the terminals and pull out the lead wires Fig 20 Wiring of reversing switch 2 Wiring of speed control switch Insert each cord into the terminal 1 and terminal 2 of the speed control switch as shown in Fig 21 and tighten the screw tightening torque 0 6 0 2 Nm 6 2 kgf cm 5 2 1 7 in Ibs Insert the lead wire gray 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 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 21 Wiring of speed control switch o o 2 a 2 o o 2 9 z Red Stator Gray Stator Noise supperssor White White 24 10 Insulation tests On completion of disassembly and repair measure the insulation resistance and conduct the dielectric strength test Insulation resistance 7 M Q or more with DC 500 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 1minute with no abnormalities 110 V 120 V except U K products 11 No load current values After no load operation for 30 minutes the no load current value should be as follows
29. s equipped with a change lever for changeover between rotation only and rotation and hammering functions Be sure to set the change lever to rotation only for drilling into wood or metal materials or for driving screws by means of the optional chuck adapter or drill chuck Should the change lever be set to rotation and hammering when such an optional tool is used for drilling or driving screws the hammering action may cause the drill chuck or other optional tool to be broken or damaged Salespersons should carefully ensure that the buyer is thoroughly advised on this point 5 Drill bits The chuck section is designed exclusively for the popular and widely available SDS plus shank bits as shown in Fig 5 Rotating torque is transmitted to the drill bit by two key rails provided in the tool holding section A steel ball is used to prevent the bit from falling out Key slot two pieces Section A A Shape of SDS plus shank bit Key rail 2 pcs Ball holder Steel ball Section of the chuck section 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 6 shows the regrinding angle 13 Regrinding angle of drill bit Rotation direction Section A B 6 Tool retainer section T
30. t with noise suppressor Fig 16 Choke coil Black or brown Cord ass y Noise suppressor White or blue Speed control SW Reversing SW 20 2 Product without noise suppressor Fig 17 Black or brown Cord ass y White or blue 72 Speed control SW Reversing SW 21 9 Internal wire arrangement and wiring work A Internal wire arrangement 1 Product with noise suppressor Fig 18 Brown Choke coil Black Stator Choke Coil A Blue 61 oxe COIA Bir THIS Je 1 Choke coil Brown 59 AU JL vill 3 White Stator f Red Stator 7 Blue Choke coil PI White or blue 22 2 Product without noise suppressor Fig 19 Brown CB Black Stator 1 Ph B Additional wiring work General internal wiring can be accomplished by referring to paragraphs 8 and 9 The following are special instructions for switch connection 1 Wiring of reversing switch Insert the lead wire black coming from the stator into the terminal 4 of the reversing switch and the lead wire white into the terminal 3 as shown in Fig 20 Insert the lead wire brown coming from the carbon brush or choke coil into the terminal 2 and the lead wire blue into the terminal 1 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 screwd
31. the armature is transmitted to the second shaft via the first gear The second shaft rotation is further transmitted through a spline to the clutch The cylinder flange is pressed against the clutch by the retracted tool shaft and the clutch engages with the reciprocating bearing to transmit rotation to the reciprocating bearing However ring grooves on the inner race of the reciprocating bearing are positioned on an angle of inclination with relation to the second shaft Rod Air chamber Piston pin Piston O ring Slip mechanism Tool shaft Armature Motor shaft KL Cylinder Second hammer Second gear Second pinion Cylinder flange First gear Second shaft spline Second shaft Ringed ditch Reciprocating bearing The rotation of the inner race and the shaft causes that angle of inclination to change regularly forward and backward with relation to the second shaft and produces a rocking motion to the outer race of the reciprocating bearing Finally a rod extending from the outer race of the reciprocating bearing is connected to the piston by the piston pin and causes the reciprocating bearing motion of the piston 10 Hammering function The piston reciprocates within the cylinder to move the striker in the same manner as in conventional hammer drills As the piston reciprocates the changing air pressure inside the air chamber between the piston and the striker causes the striker to move and
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