POWER TOOLS
Contents
1. 8 las Sulti e i s a er OI TM 8 Z CAO PR Hm 8 7 3 Grease CD uu 8 7 4 O Ring Replacement 9 8 REFERENCE INFORMATIONN UO mud v 9 OPE 0 9 9 2 Idliig Proor Mechanism sans uuu uuu uuu uu uuu lu l u 10 8 3 Shock Absorbing Mechanism sise 10 8 4 Sealed Dustproof sisi 11 8 5 Vibration Absorbing Construction 11 9 6 HOlgligb uu vanes UU cm 12 8 7 Adjusting Mechanism for the Tool Swivel Angle 12 222445 2 54 16 12 9 REPAIR GUIDE aa 13 9 1 Precautions and Suggestions for Disassembly Reassembly of the Main 13 10 STANDARD REPAIR TIME UNIT SCHEDULES 18 Assembly Diagram for H 45MR 1 PRODUCT NAME Hitachi Electric Hammer Model H 45MR 2 MARKETING OBJECTIVE The Model 45MR is an upgraded version of the current Model 45MA which features the use of maker B s SDS max shank tools The performance durability2. the two Needle Rollers D8 x 20 5 and Spring A 6 can be removed from the Retainer Sleeve 16 Remove the Retaining Ring D42 7 by means of a snap ring remover then the Ball Holder 8 Grip B 9 and the four Steel Balls D6 35 11 can be removed from the Front Cover 13 Furthermore remove the Retaining Ring D42 7 by means of a snap ring remover then Grip C 10 can be removed from the Front Cover 13 Fig 13 Piston and striker disassembly Remove the Seal Lock Hex Socket Hd Bolts M6 x 25 12 fixing the Front Cover 13 then the Retainer Sleeve 16 and the Front Cover 13 Hammer Holder A 18 Damper A 17 Second Hammer 20 Hammer Holder B 22 Damper B 23 Washer 24 Hammer Holder C 25 Damper C 21 Cylinder Holder 28 Cylinder 31 Sleeve A 29 and Spring C 30 can be removed from the Cylinder Crank Case 48 The Striker 26 can be removed by tapping the Cylinder 31 lightly with a plastic hammer As the Piston 33 remains in the Cylinder Crank Case 48 side remove the Seal Lock Hex Socket Hd Bolts M4 x 12 36 fixing the Crank Cover 38 then the Crank Cover 38 can be removed from the Cylinder Crank Case 48 and remove the Retaining Ring for D10 Shaft 41 to remove the Connecting Rod 34 from the Crank Shaft 42 s First gear and crank shaft disassembly Remove the grease from the Connecting Rod 34 side and the First Gear 53 side of the Cylinder Crank Case
3. 48 Remove the two Seal Lock Hex Socket Flat Hd Bolts M5 x 12 44 fixing Bearing Cover A 45 Then place the Connecting Rod 34 side of the Cylinder Crank Case 48 downward on a workbench and apply pressure on the end surface of the Crank Shaft 42 with a hand press to remove the First Gear 53 and the Crank Shaft 42 Fig 14 Before removing them make sure that the two Seal Lock Hex Socket Flat Hd Bolts M5 x 12 44 fixing Bearing Cover A 45 are removed lt gt Apply pressure on the end Crank Shaft 7 surface of the crank shaft with a hand press Fig 14 9 1 2 Reassembly Reassembly can be accomplished by following the disassembly procedure in reverse However special attention should be given to the following items e First gear and crank shaft reassembly Press fit the Ball Bearing 6203DDCMPS2L 46 in the Cylinder Crank Case 48 and fix Bearing Cover A 45 with the two Seal Lock Hex Socket Flat Hd Bolts M5 x 12 44 Press fit the Crank Shaft 42 Then mount the Oil Seal 47 Put the Feather Key 4 x 4x 10 43 into the groove of the Crank Shaft 42 and press fit the First Gear 53 with a suitable tool while holding the flat portion of the Crank Shaft 42 with a steel bar Before press fitting make sure that the Feather Key 4 x 4 x 10 43 fits in the key groove of the First Gear 53 Fig 15 ZY First gear AL seal T ot Hd D s T FN Pat ex socket hd fla ee ME
4. The tool swivel angle can be easily changed in 12 steps The tool swivel angle can be set freely to the desired position by pushing out grip B ahead in A direction and then turning grip A in direction Fig 10 Grip A Grip B Fig 10 8 8 Side Handle The side handle can be adjusted by 360 rotation and also allows operation from front to rear Loosen the handle by turning the grip A direction and adjust the handle to a convenient position Turn the grip in direction to fix the side handle Fig 11 12 9 REPAIR GUIDE 9 1 Precautions and Suggestions for Disassembly and Reassembly of the Main Body The numbers in Bold correspond to the item numbers in the Parts List and exploded assembly diagrams 9 1 1 Disassembly Retainer disassembly See Figs 12 and 13 Pull Grip 2 fully in the arrow direction as shown Fig 12 and remove the Front Cap 1 since the Front Cap 1 is made of rubber and engaged firmly with the Retainer Sleeve 16 pull it strongly to remove This allows Grip A 2 to be separated from the Retainer Sleeve 16 Front cap Grip A Needle roller D8 x 20 2 pcs Ball holder Grip B Ring EH oc fo pe n pns mangos re Retainer sleeve Spring A ring Steel ball 4 pcs Grip C Front cover Fig 13 Remove the Ring 3 by means of a snap ring remover then the Needle Holder 4
5. BEARING M661 320 841 GEAR COVER ASS Y 317 107 317 106 BOLT M8 HANDLE HOLDER B 317 105 HANDLE HOLDER A 320 635 BAND 317 108 GRIP 317 103 935 829 SIDE HANDLE ASS Y m INCLUD 56 60 z 999 073 971 001 938 477 320 834 877 839 BRUSH CAP CARBON BRUSH AUTO STOP TYPE 1 PAIR BRUSH HOLDER HEX SOCKET SET SCREW M5X8 TAIL COVER SEAL LOCK HEX SOCKET HD BOLT M5X10 620 1DD BALL BEARING 6201DDCMPS2L 302 429 DUST WASHER B 360 571C ARMATURE 110V 360 571U 360 571E ARMATURE ASS9S Y 120V ARMATURE 220V 230V INCLUD 68 69 76 77 360 571F ARMATURE 240V 320 832 FAN GUIDE 953 174 HEX HD TAPPING SCREW D5X55 340 519C 340 519G INCLUD 74 u INCLUD 74 75 STATOR ASS Y 110V STATOR ASS Y 120V 340 519H STATOR ASS Y 220V 230V INCLUD 74 75 340 519E STATOR ASS Y 220V 230V INCLUD 74 FOR GBR 230V EUROPE NOR SWE DEN FIN SUI 340 519F 930 703 STATOR ASS Y 240V BRUSH TERMINAL INCLUD 74 930 804 TERMINAL M4 0 10 PCS EXCEPT FOR AUS GBR EUROPE NOR SWE DEN FIN SUI 982 631 WASHER A 608 VVM 320 833 BALL BEARING 608VVC2PS2L HOUSING ASS Y 320 836 SLEEVE B 320 838 HANDLE PACKING B 984 509 SEAL LOCK HEX SOCKET HD BOLT M5X14 980 754 310 424 INTERNAL WIRE HOLDER INTERNAL WIRE HOLDER FOR AUS GBR EURO
6. M5 x 10 6 Attached bolts of crank cover 4 41 0 49 N m 45 5 kgf cm 39 41 4 3 in lbs Hex socket hd bolts M4 x 12 7 Tapping screws D4 1 96 0 49 N m 20 5 kgf cm 17 4 4 3 in Ibs 8 Attached bolts of handle 4 99 Nem 50 kgf cm 43 4 7 in Ibs Hex socket hd bolts M5 x 12 9 Attached bolts of internal wire holder 7 84 Nem 80 2 kgf cm 69 4 14 in Ibs Hex socket hd bolts M5 x 14 AG 9 1 5 Internal wiring e Wiring diagram for products with noise suppressor Switch Stator Connector 010100 o Brown 12 MEN Plug Bi Noise Armature suppressor u cs 1er Blue Le T OOOC e Stator Pillar terminal Fig 18 e Wiring diagram for products without noise suppressor Stator puer 0101010 o Black Plug A Armature 0000 wi Stator Connector Fig 19 9 1 6 Insulation tests On completion of disassembly and repair measure the insulation resistance and dielectric strength Insulation resistance 7 MQ or more with DC 500 V Megohm Tester Dielectric strength 4 000 V 1 minute with no abnormalities 220 V 240 V and 110 V for U K products 2 500 minute with no abnormalities 110 V 127 V except U K products 9 1 7 No load current value After no load operation for 30 minutes the no load current value should be as follows Seem e s ie 10 STA
7. cy Slotted housing and the handle connected through four cylindrical rubbers handle dampers ylindrical Vibration is absorbed by the rolling and convex compression of the four rubbers on inclined surfaces Because the vibration absorbing unit has non linear spring characteristics its spring constant factor is lower than that of the Handle damper retaining material Cylinder crank case and housing conventional shearing rubber type vibration Vibration absorbing construction and it provides Hand de significantly higher efficiency minimizing Pressing force of the main body vibration In addition the interlocking slotted groove and cylindrical convex portions at the center prevent the handle from being Main body side Reaction gt disconnected by twisting or pulling a common a At no load b At full load problem with conventional hammers Fig 8 8 6 Tool Retainer The Model 45MR is equipped with a slide type tool retainer Tools can be attached and detached just by pulling grip A While pulling grip A in direction insert the tool in the hole of the front cap Fig 9 Adjust the groove position by turning the tool and push it in to the end Lock the tool by returning grip A back to the original position Grip A l Tool shank E Front cap Fig 9 8 7 Adjusting Mechanism for the Tool Swivel Angle
8. s o T 1 Rammer 2 Shank SDS max shank type 1 313478 220 mm 8 21 32 313479 150 mm x 150 mm 7 Grease for impact drill 500 g 1 1 lbs Can 70 g 2 5 oz Tube 30 g 1 oz Tube Code No 980927 Code No 308471 Code No 981840 Note Code numbers listed above are subject to change without notice Please refer to periodic Technical News Bulletins 6 COMPARISONS WITH SIMILAR PRODUCTS 6 1 Specification Comparison Maker HHACH 45 For EN H 45MA EN U S A etc s a 1 h 454 445 524 450 engt mm 1 7 7 8 1 7 33 64 20 5 8 1 7 23 32 Dimensions 230 210 224 230 Height mm 9 1 16 8 9 32 8 13 16 9 1 16 106 106 102 mm 4 11 64 4 11 64 3 55 64 4 1 64 Weight without cord and 5 9 5 4 6 1 5 4 side handle 13 0 Ibs 11 9 Ibs 13 5 Ibs 11 9 Ibs Insulation structure Double insulation insulation Double insulation Double insulation insulation Double insulation insulation 6 2 Demolition Performance Comparison The data shown in Fig 1 are obtained in actual factory tests and are for reference only Demolished amount may vary in accordance with operating conditions operator skill etc Demolished amount 80 kg 30 min 81 Demolished weight for 30 min kg 6 3 Full load Vibration Level Comparison The graph shown in Fig 2 illustrates the relationship between handle pressin
9. 53 g 1 9 oz of new grease into the cylinder crank case connecting rod side Do not exceed the designated amount of grease Excessive grease insertion may cause reduced striking performance The speed reduction portion inside the gear cover uses Hitachi Motor Grease No 29 Code No 930035 The proper supply volume is 20 g 0 7 oz Never use the striking portion special grease in the speed reduction portion Special grease would leak into the motor portion and cause subsequent trouble 7 4 O Ring Replacement The O rings mounted on the striker and piston are extremely important to ensure adequate sealing of the air pressure Although the O rings are made of special rubber to give them a long service life they do nonetheless become worn and should be replaced by new ones periodically depending on frequency of use of the tool With average use it is recommended that the O rings be replaced at least every six months to ensure maximum effectiveness 8 REFERENCE INFORMATION Structure Crank cover S T O rings dE a Striker Connecting rod Crank shaft A IBS AR 7 PA Jl a 4 In SG EORR un HE pax ys En Lee 0 DE Ee toe Me Air chamber Cylinder Piston Armature Fig 4 8 1 Striking Operation The rotation of the armature is transferred to the crank shaft and connecting rod which in turn cause the piston to recip
10. Bearing cover Crank shaft Cylinder crank case Suitable tool i I 2 Feather key 8 C Steel bar Fig 15 ES Piston reassembly Insert the Piston Pin 32 into the D8 hole marked of the Piston 33 and the Connecting Rod 34 then press fit it Be careful not to protrude the Piston Pin 32 from the outside diameter of the Piston 33 Move the crank pin of the Crank Shaft 42 to the bottom dead center and insert the piston ass y into the Crank Shaft 42 from the cylinder case of the Cylinder Crank Case 48 Mount the Retaining Ring for D10 Shaft 41 using a retaining ring puller Piston pin D8 hole Mark Cylinder reassembly Move the crank pin of the Crank Shatt 42 then move the Piston 33 to the top dead center Insert the Cylinder 31 into the Cylinder Crank Case 48 Cylinder Piston Crank pin portion Lubrication Apply special grease grease for electric impact drills to the inner circumference of the Connecting Rod 34 the O rings 27 in the Striker 26 and in the Piston 33 the outer circumference of the Retainer Sleeve 16 the sliding portion of the Second Hammer 20 the Oil Seal 47 Damper A 17 Damper B 23 Damper C 21 the inner circumference of Sleeve A 29 Hammer Holder B 22 Hammer Holder C 25 and the end surface of Spring A 6 Seal 53 g of the special grease into the Cylinder Crank Case 48 the Connecting Rod 34 side A
11. D6 35 10 PCS 981 942 SEAL LOCK HEX SOCKET HD BOLT M6X25 320 809 FRONT COVER 980 879 O RING 5 34 16 990 067 320 805 O RING 1AS 50 RETAINER SLEEVE 17 320 812 DAMPER A 18 320 811 HAMMER HOLDER A 19 319 572 O RING 5 25 20 320 813 320 817 SECOND HAMMER DAMPER C 320 814 HAMMER HOLDER B 320 815 DAMPER B 320 835 WASHER 26 320 816 320 822 HAMMER HOLDER C STRIKER 27 320 823 O RING 28 320 818 CYLINDER HOLDER 29 320 820 SLEEVE A 30 320 821 320 819 SPRING CYLINDER 320 826 PISTON PIN 320 824 PISTON 320 825 CONNECTING ROD 986 940 SEAL LOCK HEX SOCKET HD BOLT M6X45 I N 983 162 LOCK HEX SOCKET HD BOLT M4X12 HITACHI LABEL 320 831 CRANK COVER HITACHI LABEL 956 996 O RING 1AS 60 939 540 RETAINING RING FOR D10 SHAFT 10 PCS 320 829 CRANK SHAFT 930 511 FEATHER KEY 4X4X10 980 760 SEAL LOCK HEX SOCKET FLAT HD BOLT M5X12 980 761 BEARING COVER A 620 3DD BALL BEARING 6203DDCMPS2L 310 119 OIL SEAL 320 828 CYLINDER CRANK CASE NAME PLATE 320 837 HANDLE PACKING A 310 124 HANDLE DAMPER 8 ALTERNATIVE PARTS 5 02 310 123 45 one EJ _ TRANSATORY UNIT 320 830 FIRST GEAR 939 299 NEEDLE
12. IFICATIONS Enclosure Materials Aluminum alloy die casting Nylon resin Handle tail cover and crank cover Paint Silver green metallic black Type of handles D shaped handle and side handle Full load current For Europe Australia U S A 9 1 A 110 V 8 3 120 V 5 0 A 220 4 4 A 230 4 2 240 V won iow Striking speed No load 4 000 min Full load 3 000 Weight Product 5 9 kg 13 0 lbs excluding cord and side handle Packed 10 2 kg 22 5 Ibs Packaging Corrugated cardboard box with plastic tool case Standard accessories Bull point 280 mm 11 1 32 e Side handle e Hex bar wrench for M6 e Hex bar wrench for M5 e Hex bar wrench for M4 e Plastic tool case 5 1 Optional Accessories 1 Demolition work lt 1 Bull point SDS max shank type 280 mm 11 1 32 313471 400 mm 15 3 4 313472 2 Grooving and chiseling work ee 1 Cold chisel SDS max shank type 280 mm 11 1 32 313473 400 mm 15 3 4 313474 3 Cutting and stripping work asphalt cutting etc DE E 1 Cutter SDS max shank type Width Overall length 50 mm 2 400 mm 15 3 4 313475 4 Digging substitute pick ax Ce 1 Scoop SDS max shank type 400 mm 15 3 4 313476 5 Roughing surface work CT 1 Bushing tool 2 Shank SDS max shank type 313477 220 mm 8 21 32 313479 6 Tamping work
13. MODEL 45 HITACHI POWER TOOLS TECHNICAL DATA HAMMER 1 45MR SERVICE MANUAL LIST No E463 MAY 2002 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT REMARK Throughout this TECHNICAL 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 Competitors Symbols Utilized Company Name Model Name BOSCH GSH5E CONTENTS Page I PRODUCT NAME uuu u u u eee dan ananas nat a ie ici 1 2 MARKETING OBJECTIVE 1 SM APPLICAIIONS5 u s 1 SEPEPINO POINT S ux ie 1 4 1 Selling Point 2 5 SPECIFICATIONS uuu gt Ce 3 p L OPONA C O SO 4 6 COMPARISONS WITH SIMILAR PRODUCITS 6 6 1 Specification Comparison ccccccccccsseeeccceeceeeeecceeeeseeeeeceeeeeseeseeeeeesauseeceeeesseeeeeeeesssaaeeeeeesssaaeeeeees 6 6 2 Demolition Performance Comparison iii 6 6 3 Full load Vibration Level Comparison se 7 6 4 Quantity of Working Tool Penetration and Quantity of Body JUMPING 7 7 PRECAUTIONS IN SALES
14. NDARD REPAIR TIME UNIT SCHEDULES General Assembly Work Flow Crank Cover O ring Side Handle Ass y Front Cap Grip A Needle Holder Ball Holder Grip B Grip C B Front Cover O ring S 34 O ring 1AS 50 Retainer Sleeve Spring A Damper A Hammer Holder A O ring S 25 Second Hammer Damper B Damper C Hammer Holder B Hammer Holder C Cylinder Holder Handle B Transatory Unit Gear Cover Ass y Needle Bearing Armature Ass y Ball Bearing 6201DD Ball Bearing 608VV Dust Washer B Washer A A Crank Shaft Key 4x4x10 Ball Bearing 6203DD Oil Seal First Gear Striker Sleeve A O ring x 2 Spring C Piston Cylinder Piston Pin Connecting Rod 8 Housing Ass y Stator Ass y Cylinder Crank Case ITACH LIST 463 ELECTRIC TOOL PARTS LIST 2002 5 30 Model 45 1 24 5 Ni 5 Le a SR PARTS ms _ 315 529 FRONT 45MR 320 802 GRIP 320 803 RING 320 804 NEEDLE HOLDER 313 421 320 806 NEEDLE ROLLER D8X20 SPRING A 317 088 RETAINING RING D42 320 810 BALL HOLDER 320 807 GRIP B 1 320 808 959 150 GRIP C STEEL BALL
15. PE NOR SWE DEN FIN SUI 991 690 SEAL LOCK HEX SOCKET HD BOLT M5X12 991 711 DISTANCE PIECE B 320 839 HANDLE A 990 861 994 273 INTERNAL WIRE NOISE SUPPRESSOR FOR AUS GBR EUROPE NOR SWE DEN FIN SUI FOR AUS GBR EUROPE NOR SWE DEN FIN SUI 317 492 FOR NOISE SUPPRESSOR SUPPORT B 981 974 INTERNAL WIRE FOR AUS GBR EUROPE NOR SWE DEN FIN SUI VINYL TUBE FOR USA CAN 320 840 HANDLE B 306 143 SWITCH B 1P SCREW TYPE W LOCK INCLUD 64 65 ALTERNATIVE PARTS I PARTS H 45MR NOE CODE NO DESCRIPTION 93 307 028 TAPPING SCREW W FLANGE D4X25 BLACK 94 959 140 CONNECTOR 50091 10 PCS FOR AUS GBR EUROPE NOR SWE DEN FIN SUI 95 938 307 PILLAR TERMINAL FOR AUS GBR EUROPE NOR SWE DEN FIN SUI E USA CAN 96 959 141 CONNECTOR 50092 10 PCS EXCEPT FOR USA CAN 97 SDS MAX LABEL 98 984 750 TAPPING SCREW W FLANGE D4X16 99 960 266 CORD CLIP 99 981 9877 CORD CLIP FOR SUI 100 949 423 WASHER 10 PCS FOR AUS GBR EUROPE NOR SWE DEN FIN SUI 981 373 TUBE D FOR CORD 980 063 TERMINAL FOR AUS GBR 110V EUROPE NOR SWE DEN FIN SUI 992 810 TERMINAL FOR GBR 230V 930 804 TERMINAL 4 0 10 5 FOR USA CAN 953 327 CORD ARMOR 08 8 T 938 051 CORD ARMOR D10 1 500 3947 CORD CORD ARMOR D10 1 si 500 4082 CORD ARMOR D8 8 FOR AUS 500 4462 CO
16. RD ARMOR D8 8 FOR 230V 500 4547 CORD CORD ARMOR D8 8 FOR GBR 110V 500 390Z CORD ARMOR D8 8 FOR EUROPE NOR SWE DEN FIN 500 3917 ARMOR D8 8 FOR SUI 500 4347 CORD ARMOR D8 8 FOR USA CAN STANDARD ACCESSORIES TE coeno esonero fu mms o 313 471 BULL POINT SDS 2801 943 277 HEX BAR WRENCH 3MM FOR AUS GBR EUROPE NOR SWE DEN FIN SUI 944 458 BAR WRENCH 4MM 944 459 BAR WRENCH 5 320 842 CASE OPTIONAL ACCESSORIES 313 472 BULL POINT SDS 400L 313 473 COLD CHISEL SDS MAX 280MM 313 474 COLD CHISEL SDS MAX 400MM 313 475 CUTTER SDS MAX W50X400L 313 476 SCOOP SDS MAX 400L 313 478 RAMMER SDS MAX 150MM X 150MM 313 479 SHANK SDS MAX FOR RAMMER BUSHING TOOL 981 840 GREASE A FOR HAMMER HAMMER DRILL 30G 308 471 GREASE FOR HAMMER HAMMER DRILL 70G 980 927 GREASE FOR HAMMER HAMMER DRILL 500G EXCEPT FOR USA CAN ALTERNATIVE PARTS Printed in Japan 4 020530N Hitachi Koki Co Ltd Tokyo Japan
17. and operability are greatly improved With this competitive Model H 45MR we aim to enhance the share of the SDS max type hammers The main specifications are as follows 1 High chipping and demolishing performance with low vibration and noise level 2 Self chiseling Good feeling 3 Internal double insertion construction with sturdy aluminum frame 4 A highly reliable mechanism for prevention of idle hammering and shock absorbing mechanism results in prolonged service life and comfortable operation 5 D type side handle with adjustable mechanism for 360 rotation plus positioning from front to rear 6 7 Soft touch grip for easier handling Simply turning method variable lock mechanism for easy working angle adjustment of chisels etc 5 6 7 8 8 very original design 3 APPLICATIONS Demolishing and chiseling of concrete Edging gravel road digging compacting and tamping grooving cutting stripping and roughing etc 4 SELLING POINTS High chipping and demolishing performance with low vibration and noise level e Self chiseling Good feeling A very original design A highly reliable mechanism for prevention of idle Hitachi original design hammering and shock absorbing mechanism results vibration absorbing handle for in prolonged service life and comfortable operation excellent vibration reduction Large trigger switch for comfortable operation Simply turning method variable lo
18. ck mechanism for easy working angle adjustment of chisels etc D type side handle with adjustable mechanism for 360 rotation plus positioning from front to rear Internal double insulation construction Soft touch grip with sturdy aluminum frame for easier handling ES 4 1 Selling Point Descriptions 4 1 1 High chipping and demolishing performance with low vibration and noise level Demolition performance is 1 2 to 1 5 times higher than that of similar products thanks to the 12 5 J impact energy and efficient striking The chipping performance is 1 2 to 1 5 times higher than that of similar products Even so the Model H 45MR produces equivalent or lower vibration and sound levels than those of similar products and Equipped with constant speed control 4 1 2 Self chiseling Good feeling Thanks to the computer simulated optimum striking characteristics the quantity of body jumping is less than that of the current Model H 45MA and the working tool smoothly penetrates into the workpiece with a light pressing force The Model H 45MR realizes quicker self chiseling with better impact feeling Impact energy 40 up 9 0 J to 12 5 J Maximum compressed air force piston force About 30 down Quantity of body jumping About 45 down 4 1 3 Internal double insulation construction with sturdy aluminum frame The aluminum die cast outer frame is very sturdy highly rigid In addition a plastic internal S hold
19. er holder A then the cushion damper A provided between hammer holder A and the front cover absorbs the striking force of the second hammer Thus the Model H 45MR has greater durability than the similar products 4 1 5 D type side handle with adjustable mechanism for 360 rotation plus positioning from front to rear The D type side handle can be adjusted by 360 rotation and also allows convenient operation from front to rear This side handle has a two layer plastic construction integral molding made of nylon resin as the base and soft resin around it for a comfortable cushion grip 4 1 6 Soft touch grip for easier handling The double layer molded handle consists of a nylon resin base covered with a soft plastic layer to ensure a soft touch and firm non slip grip of the handles 4 1 7 Simply turning method variable lock mechanism for easy working angle adjustment of chisels etc The tool swivel angle can be easily changed in 12 steps by pushing out grip B ahead and then turning grip A 4 1 8 Original design vibration absorbing handle Vibration absorbing is significantly improved Hitachi s original design vibration absorbing handle minimizes vibration through the rolling and compression of four cylindrical rubber cushions on inclined surfaces The spring constant factor is as low as that of the Models H 45SB2 H 41SC H 45SR H 60KA H 60MA and H 60MB and the cushioning structure greatly reduces vibration 5 SPEC
20. er is adopted to realize double insulation construction Thus the housing has greater rigidity and the double insulated motor has greater durability The Model H 45MR is heavy duty and the service life of the carbon brush is greatly prolonged 3 times longer than the conventional one minimizing disconnection of the armature deviation of the core and grease leakage 4 1 4 A highly reliable mechanism for prevention of idle hammering and shock absorbing mechanism results in prolonged service life and comfortable operation Conventional mechanism for prevention of idle hammering is to open and close the air holes according to the movement of the striker The Model H 45MR has air holes located at the position unaffected by the rebound of the striker at no load The air holes are opened and closed by the movement of sleeve A provided around the cylinder that interlocks with the tool and the second hammer to prevent idle hammering This mechanisms securely prevents idle hammering even in wall hammering works or even if a tool that can cause great rebound on the striker such as a cutter is used Thanks to the highly reliable mechanism for prevention of idle hammering the service life of the Model H 45MR is prolonged and hammering works requiring much attention not to break the surroundings can be efficiently performed with the Model H 45MR At the instance of releasing the bull point from the concrete by moving the main body up the second hammer contacts hamm
21. g force and handle vibration level in the Z direction 126 0 HITACHI 45MR HITACHI H 45MA 124 0 C T La B Normal pressing force range m 122 0 2 D 120 0 c 118 0 116 0 114 0 100 150 200 250 Pressing force load N Fig 2 6 4 Quantity of Working Tool Penetration and Quantity of Body Jumping The graph shown in Fig 3 illustrates the relationship between ratio of quantity of working tool penetration and ratio of quantity of body jumping The quantity of body jumping is less than the similar products and the working tool quickly penetrates into the workpiece Pressing force 100N Ratio of quantity of body jumping Ratio of quantity of working tool penetration 7 PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model H 45MR Electric 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 attached to each tool 7 1 Handling Instructions Although every effort is made in each step 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 fo
22. ing force of the second hammer Thus the durability of the Model H 45MR is increased greatly because the second hammer does not strike the tool retainer directly Second hammer Hammer holder A Damper A Fig 6 zx es Vibration absorbing unit O ring Cylinder crank case O ring Switch handle Mi T sr SE RES e pe ELLE Ila PRE EME EN Retainer sleeve ha V MEE Front cover SE E E RES testet Housin gi EL i D m Ir E n di gt PNE T 228 39 ALITUR V Vibration absorbing Fig 7 unit d 8 4 Sealed and Dustproof Construction The cylinder crank case is sealed by four O rings and an oil seal which serve to prevent leakage of the grease as well as to prevent dust and dirt from entering the mechanism 8 5 Vibration Absorbing Construction Hitachi original innovative units which absorb vibration are installed between the switch handle and the cylinder crank case and between the switch handle and the housing As a result the amount of vibration transmitted from the main body to the arms of the operator is considerably less in comparison with conventional hammers Construction of vibration absorbing unit Cylindrical rubbers handle damper 4 pcs Handle damper retaining material handle side The main body cylinder crank case and y
23. pply Hitachi Motor Grease No 29 to the Needle Bearing M661 54 the pinion portion of the Armature 70 the Needle Roller D8 x 20 5 and the Steel Ball D6 35 11 Seal 20 g of the Hitachi Motor Grease No 29 into the Cylinder Crank Case 48 the First Gear 53 side 25 e Oil seals Be very careful not to damage the O ring 1 5 50 15 on the Front Cover 13 the O ring 5 34 14 in the Front Cover 13 the O ring S 25 19 in Hammer Holder A 18 the O ring 1AS 60 40 in the Crank Cover 38 the O rings 27 in the Striker 26 and in the Piston 33 and the Oil Seal 47 in the Cylinder Crank Case 48 9 1 3 Screw locking agent TB1401 Apply screw locking agent TB1401 to all hex socket hd bolts M4 M5 and M6 Caution If bolts are loosened by vibration it could cause damage to the hammer body Ensure without fail that screw locking agent is applied to threaded portions prior to reassembly 9 1 4 Tightening torque 1 Attached bolts of front cover 18 7 998 Nem 140 10 kgf cm 121 5 7in Ibs Hex socket hd bolts M6 x 25 2 Attached bolts of bearing cover A 4 41 0 49 45 5 kgf cm 39 1 4 3 in Ibs Hex socket hd flat bolts M5 x 12 3 Tapping screws D5 2 94 0 49 N m 30 5 kgf cm 26 0 4 3 in Ibs 4 Hex socket hd bolts M6 x 45 9 8 5 100 7 kgf cm 86 8 17 in Ibs 5 Attached bolts of tail cover 4 9 7 Nem 50 i kgf cm 43 4 174 in Ibs Hex socket hd bolts
24. r the use of electric power tools and specific precautions and suggestions for the use of the Electric 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 7 2 Caution Plate The Model H 45MR 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 the tool For Australia Hitachi Koki MADE IN JAPAN CAUTION eRead thoroughly HANDLING INSTRUCTIONS before use For the U S A and Canada Hitachi Koki MADE IN JAPAN WARNING mmm To reduce the risk of injury user must read and n n in de reduire le risque AVERTISSEMENT de blessures Putilisateur doit lire et bien comprendre le mode d emploi 7 3 Grease Replacement The striking portion and the speed reduction portion of the Model 45MR respectively use different types of grease Grease replacement is required if the unit is disassembled for maintenance of O rings become damaged and worn as described in 7 4 The striking portion uses special grease If the striking portion inside the cylinder crank case is disassembled thoroughly remove all of the old grease from each part On reassembly insert
25. rocate inside the cylinder As the piston reciprocates the changing air pressure inside the air chamber between the piston and the striker causes the striker to continuously strike against the end of the second hammer At the same time the air cushion effect within the air chamber absorbs the impact of the striker Should the air escape from the air chamber the air cushion effect would cease and the impact energy would not be absorbed Accordingly the O rings mounted on the striker and piston play an extremely important role in sealing the air within the air chamber 8 2 Idling Proof Mechanism When the bull point is released from the concrete surface sleeve and the second hammer are forcibly moved to the position illustrated in Fig 5 by spring C and the striker moves out of striking position When this occurs the air holes located at the position unaffected by the rebound of the striker at no load are opened and the pressure within the air chamber remains unchanged even though the piston continues to reciprocate thereby preventing striking operation Second hammer Striker Sleeve A Spring C Forward movement of Air hole second hammer amp striker Fig 5 8 3 Shock Absorbing Mechanism At the instance of releasing the bull point from the concrete by moving the main body up the second hammer contacts hammer holder A then the cushion damper A provided between hammer holder A and the front cover absorbs the strik
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