POWER TOOLS COIL NAILER NV 45AB2 NV 45AB2
Contents
1. 9 p 48 58 9 5 9 6 eg 9 Z 9 eg 9 5 9 6 eg 9 129 6 9 S Y Jeg 8 6 p Jeg 8 Et Jeq 6 9 6 Jeg 8 Et Jed 8 Et ainssaid amp unejedo SLONGOYd HVIINIS HLIM SNOSIHVdWOD 9 7 PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model NV 45AB2 Nailer 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 Instruction Manual and fully understands the meaning of the precautions listed on the Warning Label attached to each tool The Model NV 45AB2 Nailer is designed for continuous nail driving At time of sale the salesperson must inform the customer that the sequential trip mechanism kit which can change the Model NV 45AB2 to a single shot nailer is optionally available and recommend it to the customers who want to use it Refer to the leaflet attached together with the Instruction Manual for details 7 1 Instruction Manual 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 pneumatic tool cannot be completely eliminated Accordingly general precautions and suggestions for use of pneumatic tools and specific precautions and suggestions for the us2. Exhaust Valve 4 Safety valve portion los valve Exhaust Vent BES y p section Head cap 8 Trigger valve portion Exhaust cover Cap c 9 Piston 3 Air inlet Cylinder Spring 8 amp Oylinder ring Ost Driver Blade 9 Cylinder 2 Return Air E Magazine cover Chamber 6 ere Piston Bumper 7 Nail holder Magazine Adjuster 8 Magazine Nose Guard gt gt a Feeder Pushing lever Guide base Magazine Shingle guide section A A Guide lock Nail guide Main nail stopper Nose Magazine j Feed piston Feeder Fig 3 Construction 8 2 Operation Principle The operation of the Model NV 45AB2 is illustrated and described in Figures 4 through 7 The Bold numbers in the descriptions correspond to the item numbers shown in the mechanism illustration in Fig 3 In Figures 5 and 7 read the descriptions in alphabetical order 1 When the compressed air source air hose is connected to the nailer Air pressure is applied to the lower surfaces of the flanges located at the center portion of the Cylinder 2 forcing the cylinder upward The compressed air is thereby blocked from the upper end of the cylinder and no pressure is applied to the Piston 3 The Accumulator 1 is filled with compressed air The trigger and pushing lever are not operated and remain closed The exhaust vents are open a
3. Y T Holder Cap 91 Machine Screw M4 x 50 92 3 Spring Washer M4 93 Washer 94 Holder Shaft 95 Ratchet Spring 98 Nail Holder 99 Body 24 U Nut M5 96 U Nut M5 96 Feed Shaft Ring 72 Magazine 100 Bc 101 Sleeve 97 Guide Base 105 W Hex Socket Hd Bolt M5 x 14 106 gt Shingle Guide 107 Bolt 5 10 108 Fig 24 3 Single guide portion Tools required O Hex bar wrench 4 mm O Spanner 8 mm or slender hd pliers a Disassembly See Fig 22 O Remove the Nail Holder 99 from the Magazine Ass y 109 O Remove the Hex Socket Hd Bolt M5 x 10 108 Then the Shingle Guide 107 can be removed from the Guide Base 105 O Secure the U Nut M5 96 with a spanner 8 mm or a slender hd pliers Insert a hex bar wrench 4 mm from the two holes at the bottom of the Guide Base 105 and remove the Hex Socket Hd Bolt M5 x 14 106 Then the Guide Base 105 Magazine Guard 103 and Sleeve 97 can be removed The Nylon Nut M4 102 can be taken out of the hexagonal hole at the bottom of the Magazine 100 b Reassembly O Disassembly procedures should be followed in the reverse order O Drop the Nylon Nut M4 102 in the hexagonal hole at the bottom of the Magazine 100 and before mounting the Guide Base 105 and the Magazine Guard 103 to the Mag
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5. 949 665 HEX SOCKET HD BOLT M5X14 10 PCS 878 175 949 819 SHINGLE GUIDE HEX SOCKET HD BOLT M5X10 10 PCS FOR USA FOR USA 883 893 MAGAZINE ASS Y INCLUD 72 90 103 106 883 894 MAGAZINE ASS Y INCLUD 72 90 108 FOR USA STANDARD ACCESSORIES CODE NO 877 153 DESCRIPTION PNEUMATIC TOOL LUBRICANT 30CC REMARKS FOR EUROPE 943 277 HEX BAR WRENCH 3MM 944 458 HEX BAR WRENCH 4MM 875 769 EYE PROTECTOR 878 188 882 414 CAUTION TAG LEAFLET FOR USA FOR USA OPTIONAL ACCESSORIES CODE NO 878 226 DESCRIPTION SEQUENTIAL TRIP MECHANISM SET REMARKS 881 768 GRIP TAPE A 880 407 TAPE 317 918 GREASE ATTOLUB NO 2 500G ALTERNATIVE PARTS Printed in Japan 020315N 6 Hitachi Koki Co Ltd
6. Air leak part Cause When trigger valve safety valve are OFF When trigger valve safety valve are ON When trigger valve ON safety valve OFF Cap O Loose Hex Socket Hd Bolt M5 x 16 44 Broken Gasket D 42 O Defective seal surface of the Body Ass y 24 or Cap 43 D Feed piston O Defective front side O Ring 61 of Feed Piston 63 worn deformed or cut O Defective Feed Piston 63 sliding portion damaged deformed or broken Between feed piston cover and nose O Defective seal surfaces of Nose 32 and Feed Piston Cover 66 Broken Gasket E 65 O Defective rear side O Ring 61 of Feed Piston 63 worn deformed or cut O Slight amount of air is always leaked out of the Feed Piston Cover 66 structurally c9 10 DISASSEMBLY AND REASSEMBLY The items particularly necessary for disassembly and reassembly are described below The Bold numbers in the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram CAUTION e Before disassembly or reassembly be sure to remove all nails and disconnect the air hose from the nailer with your finger released from the trigger to exhaust all the compressed air 10 1 General Precautions in Disassembly and Reassembly e As the Valve Bushing 51 Plunger A 50 and Plunger B 59 are not interchangeable with similar parts on such models as the M
7. NV 45AB2 HITACHI POWER TOOLS TECHNICAL DATA COIL NAILER NV 45AB2 SERVICE MANUAL LIST No E004 Mar 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 P BOSTITCH RN45B Q SENCO SCN40R R PORTER CABLE RN175 S MAX CN450R CONTENTS Page 1 PRODUCT 1 2 MARKETING OBJECTIVE 1 SN CLdacqcs apa 1 4 SELLING POINTS 1 5 SPECIFICATIONS a atata aa ana ann aia a mada ap a za auda 3 5 1 Specifications ss Rt 3 5 2 Nail Selection E 4 5 3 Nail BINING FORCE nasal OS O O 5 5 4 Optional Accessories mean mana nana nana ana 5 6 COMPARISONS WITH SIMILAR PRODUCTS u 6 7 PRECAUTIONS IN SALES PROMOTION nunnan 7 7 1 Instr ction Manual sssrin i e e aa e e a a i a a d a al m a
8. Dust sticks to the inside of the nail guide groove or lubrication is needed xe Spring is abnormal missing damaged or fatigued The claw ridge section of the nail stopper is abnormal damaged worn or burrs e Check the operation of main nail stopper and nail stopper e Remove dust and then lubricate e Replace the abnormal parts Magazine section Pushing lever gt Magazine e Check that a nail does not catch on another nail in the magazine e Check that a nail does not catch on some part of the magazine e Check the height of the nail holder e Collate the nails correctly and reload the nailer with them Remove burrs or deformed part Replace the parts Adjust the height of the nail holder correctly Incorrect attachment of magazine Check for looseness of magazine ass y Secure screws Safety belt is not adjusted properly Check that the distance between the lower end of the nose and the lower end of the pushing lever is 5 0 5 mm 0 197 0 020 under the following conditions Pull up plunger B until it contacts plunger Pull up the pushing lever until plunger B contacts the safety bolt e Readjust the safety bolt according to 10 3 2 e Dia Problem Possible cause x most common cause Inspection method Remedy 1 Nails cannot be driven continued Output section Pis
9. Plate 16 Holding the two bolts lift upward while turning the Cylinder Plate 16 When the Cylinder Plate 16 has been removed the Cylinder 17 Cylinder Spring 19 and related parts which make up the output section can be removed If the Cylinder 17 is difficult to remove it may be pushed downward and removed from the lower part of Body Ass y 24 27 Hex Socket Hd Bolt M5 x 25 1 Top Cover 2 EP Exhaust Cover B 4 Hex Socket Hd Bolt M5 x 20 5 Body Guard 7 422 Gasket 8 7 Gasket G 9 ED Exhaust Valve 10 amp Head Cap 11 Piston O Ring 12 e Piston H 13 O Ring S 65 14 C Cylinder O Ring D 15 Cylinder Ring 1 a EZ Cylinder Spring 1 iS E Fig 12 Cy O Ring S 65 14 O O Ring A 20 Cylinder Guide 21 Cylinder O Ring B 22 Body Ass y 24 including the Grip Rubber 41 Cylinder Plate 16 Hex Socket Hd Bolt M5 x 20 5 Threaded hole for M5 bolts 28 b Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse However special attention should be given to the following items O Assemble Piston H 13 so that its semi circular grooved side is facing toward the Magzine side Same as paragraph 10 2 1 b O Ensure that the air vent holes on Gasket F 8 are proper
10. Bolt 5 x 8 30 N Nylock Hex Socket Hd Bolt 5 x 16 34 a reu Hex Socket Hd Bolt 5 x 10 68 DIR cniin Base tU ETSI REOR 37 F Machine Screw 5 x 22 39 Sox odd eee Hex Socket Hd Bolt M4 x 6 84 3 9 0 3 40 3 2 9 0 2 Machine Screw x 50 92 0 5 to 1 5 to 10 0 36 to 0 72 Hex Socket Hd Bolt M5 x 14 106 22 0 3 20 3 1 4 0 2 24 10 2 Disassembly and Reassembly of the Output Section 1 Piston Bumper 27 Bumper Sheet 28 and related parts Tool required O Hex bar wrench 4 mm O Phillips screwdriver O Roll pin puller 3 mm 0 118 a Disassembly See Figs 9 and 10 Remove the Machine Screw M5 x 22 39 and the Magazine Ass y 109 can be disassembled Body Ass y 24 Roll Pin D3x30 47 Machine Screw M5 x 22 39 Piston H 13 Cylinder O Ring 26 gt Piston Bumper Bumper Sheet 28 i Gasket A 29 Nose 32 N Magazine Ass y 109 Magazine Bushing 67 Nylock Hex Socket Hd Bolt M5 x 16 34 Fig 9 25 O Remove the Hex Socket Hd Bolt M5 x 8 30 and remove the Guard 31 from the Nose 32 From Body Ass y 24 extract the Roll Pin D3 x 30 47 which fastens and guides the Pushing Lever 3
11. before mounting the Nail Guide Shaft 74 Otherwise the Adjuster 75 cannot be mounted Mount the Adjuster 75 according to the following procedure see Fig 20 1 Mount the Adjuster Spring 76 and the Bolt 77 to the inside of the Adjuster 75 1 Insert the Nail Guide Shaft 74 into the Nose 32 Pressing the head of the Bolt 77 align the tip of the Bolt 77 with the female screw for mounting the adjuster Turn the Adjuster 75 clockwise and screw in pulling it toward the tip of the Nose 32 34 Mount the Nail Guide Shaft 74 according to the following procedure see Fig 21 1 Insert the Shaft Ring 73 between the protrusion of the Nose 32 and the Bolt 77 Turn the Adjuster 75 counterclockwise to narrow the distance between the protrusion of the Nose 32 and the Bolt 77 for easier operation Shaft Ring 73 becomes stable M Insert the Nail Guide Shaft 74 into the Nose 32 so that its grooved side faces the adjuster Push the tip in aligning with the Shaft Ring 73 until the Shaft Ring 73 snaps in the groove ai ET P amp IN Adjuster 75 Adjuster Adjuster 7s gt Spring 76 m E pring Ki potra HH Bolt 77 Shaft Ring 73 Nail Guide Shaft 74 Nail Guide Shaft Nose 32 Nose 32 Fig 20 Fig 21 2 Feed Piston 63 Feeder A 70 and related parts See Fig 22 T
12. B O Damaged Cylinder O ring B 22 or O ring X Broken or cracked Piston Nose of Cylinder Guide 21 worn deformed or Bumper 27 broken O Deformed Piston H 13 O Defective Body Ass y 24 or Nose 32 ODeformed Nose 32 worn corroded or deformed Defective Urethane Ball 07 14 54 ODefective Plunger O ring Trigger valve damaged or deformed O Defective ball sheet surface of Trigger Valve Bushing 56 damaged deformed or worn O Defective Valve Packing 53 damaged deformed or broken O Soiled or damaged valve packing sheet surface of Body Ass y 24 Incursion of foreign materials 49 worn deformed or broken O Defective outside O ring S 12 52 of Trigger Valve Bushing 56 G Safety valve x Defective Gaskets F G 8 9 damaged or Air will leak slightly from yielded x Discorded air vent of Gasket F 8 O Defective O ring S 65 14 or Cylinder O ring D 15 of the Cylinder Plate 16 worn deformed or broken O Defective Cylinder O ring D 15 worn deformed or broken the lower portion due to construction O Defective outside O ring S 12 52 of the Valve Bushing 51 worn deformed or broken ODefective Plunger O ring 49 worn deformed or broken o Defective Plunger Spring 48 deformed or broken O Defective Valve Bushing 51 deflected deformed or broken O Defective plunger deformed or deflected 22
13. piston moves downward the air below the piston section enters the F is forced into the Return Air Chamber 6 passage to the When the piston passes the feed piston middle vent some of the air pressure passes into the return air chamber This supplies auxiliary air to ensure complete return of the piston Fig 5 uu 3 If the trigger and pushing lever are kept pressed Air pressure is applied in the shaded areas in the illustration and each component is held in the position illustrated If the operator s grip is loosened air will leak As there is no O ring installed here a very small amount of air will leak from the slight clearance between the components The lower surface of the Piston 3 contacts the Piston Bumper 7 and prevents air leakage If the upper surface of the Piston Bumper 7 is damaged some air will leak Fig 6 EPIS 4 When the trigge r and or pushing lever are released C The air pressure on the upper surface of the Exhaust Valve 4 is When the air pressure at the upper side of the piston lowers the air pressure within the Return Air Chamber 6 pushes the piston upward released and the exhaust valve is pushed upward by the air pressure within the cylinder This opens the Exhaust Vent 5 and the air pressure in the cylinder and the left side surface of the feed piston are discharged from the nailer B Air pressure is discharged from the up
14. reputed for quick driving is adopted 2 Adjuster While the Model NV 45AB requires a wrench to adjust the nailing depth the Model NV 45AB2 requires no tool for adjustment Too shallow Flush Too deep m D Pull the adjuster down Turn the adjuster Flush 3 Magazine While the Model NV 45AB is equipped with a bottom loading magazine the Model NV 45AB2 is equipped with a top loading magazine The magazine can be opened closed just by the nail guide operation The Model NV 45AB requires operation of both the nail guide and the latch at the rear of the magazine 4 Carbide chip The carbide chips provided at the tip of the pushing lever are larger than the competitive products to prevent wear Maker HITACHI P Q R S Model NV 45AB2 NV 45AB 7 5 mm dia 4 5 x 10 mm 6 mm dia 6 mm dia 5 mm dia 4 mm dia Size of 1 1 0 6 0 6 0 4 0 3 carbide chip area ratio Q Q 5b Non slip rubber Although the Model NV 45AB is equipped with only a steel body guard at the side of the body a non slip rubber is added to the Model NV 45AB2 6 Handle grip Thanks to the adoption of the grip rubber that is common to the Model NR 90AC2 the handle grip of the Model NV 45AB2 is more durable than that of the Model NV 45AB 5 SPECIFICATIONS 5 1 Specifications Model NV 45AB2 Driving system Reciprocating piston type Operating pressure 5 8 5 kgf c
15. the Feed Piston 63 and Nose 32 However as excessive grease will cause improper movement of the Feed Piston 63 be very careful during grease application This is particularly important if the tool is to be used at relatively low air pressures O Carefully clean the air passage of the Nose 32 Any dust or foreign matter in the air passage will cause malfunction of the Feed Piston 63 due ERN M5 x 10 68 Magazine Bushing 67 Feed Piston Cover 66 lt Gasket E 65 Feed Piston O Ring LD 11 64 AS TED Feed Piston 63 eed Piston O Ring I D 14 62 O Ring P 9 61 Hex Socket Hd Bolt M5 x 8 30 P Feeder Spring 69 o Feeder A 70 1 Feeder Shaft 71 amp Feeder Shaft Ring 72 Fig 22 36 10 5 Disassembly and Reassembly of the Cap and the Magazine 1 Cap portion Tool required OHex bar wrench 4 mm a Disassembly See Fig 24 ORemove the Hex Socket Hd Bolt M5 x 16 44 Then Gasket D 42 and the Cap 43 can be removed b Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse OBefore reassembly check that no dust is adhered to the end surfaces of the Body Ass y 24 and the Cap 43 and Gasket D 42 2 Magazine portion Tool required OHex bar wrench 4 mm OPhilips screwdriver ORoll pin puller 4 mm 0 157 OSmall flat blade screwdriver a Di
16. 7 Ter Warning Sbi ERE 7 7 3 Related Laws and Regulations nenea nenea 8 8 MECHANISM AND OPERATION PRINCIPLE nnmnnn 8 8 1 Mechanism uuu a 8 8 2 Operation Principle 2 aa ca a genen 10 8 3 Interchangeability Au 14 9 TROUBLESHOOTING GUIDE isa aaa 55555 555555 ia ana aa dada AR ARR Sae ann da 16 9 1 Troubleshooting and Correction eene enne nnne nnns 16 9 2 Possible Causes and Corrections of Air Leakage mmm nenea nana 21 10 DISASSEMBLY AND REASSEMBLY 85859 u 24 10 1 General Precautions in Disassembly and Reassembly 24 10 2 Disassembly and Reassembly of the Output Section ana 25 10 3 Disassembly and Reassembly of the Valve Section nana 30 10 4 Disassembly and Reassembly of the Driving Section nana 33 10 5 Disassembly and Reassembly of the Cap and the Magazine 37 11 INSPECTION AND CONFIRMATION AFTER REASSEMBLY 39 12 STANDARD REPAIR TIME UNIT SCHEDULES 40 Assembly Diagra
17. 8 Then remove the Nylock Hex Socket Hd Bolt M5 x 16 34 which fasten the Nose 32 and remove the Nose 32 together with Pushing Lever 38 from Body Ass y 24 Opening the Nail Guide 78 beforehand makes it is easier to remove the Nylock Hex Socket Hd Bolt M5 x 16 34 O When disassembly as described above is completed Gasket A 29 Bumper Sheet 28 Piston Bumper 27 can be taken out in sequence from the lower portion of Body Ass y 24 Remove the Bumper Sheet 28 from Piston H 13 by opening the cut of the Bumper Sheet 28 Fig 10 At this time be careful not to scratch the hole of the Bumper Sheet 28 Open the cut Piston H 13 Bumper Sheet 28 Fig 8 b Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse However special attention should be given to the following items O When reassembling Piston H 13 ensure that the semi circular grooved side is facing toward the Magazine side See Fig 11 O When mounting the Bumper Sheet 28 to Piston H 13 open the cut of the Bumper Sheet 28 and put the driver blade in the Bumper Sheet 28 from its thin side facing the groove on the circumference of the Bumper Sheet 28 to the semi circular grooved side at the tip of Piston H 13 surely O Reassemble Gasket A 29 so that its air vents are properly aligned with the matching air vents on the Nose 32 and Body Ass y 24 O Assemble Body Ass y 24
18. B 878 170 VALVE RUBBER COVER 872 645 O RING P 9 877 763 FEED PISTON O RING D 14 878 152 FEED PISTON 877 764 FEED PISTON O RING 1 0 11 877 767 GASKET E 877 766 FEED PISTON COVER 877 479 MAGAZINE BUSHING 949 819 HEX SOCKET HD BOLT M5X10 10 PCS 877 761 FEEDER SPRING 883 901 FEEDER 877 825 FEEDER SHAFT 877 826 FEEDER SHAFT RING 883 885 SHAFT RING 883 884 NAIL GUIDE SHAFT 883 882 ADJUSTER 883 883 ADJUSTER SPRING 958 805 BOLT 883 887 NAIL GUIDE 877 820 LOCK SHAFT 877 821 GUIDE LOCK 949 776 ROLL PIN D3X10 10 PCS 877 372 SPRING 876 681 MAIN STOPPER SPRING 949 766 HEX SOCKET HD BOLT M4X6 10 PCS 949 865 ROLL PIN D3X28 10 PCS 878 185 MAIN NAIL STOPPER 878 186 STOPPER 877 468 SUB STOPPER SPRING 877 469 NAIL GUIDE COVER 883 899 MAGAZINE COVER 883 900 HOLDER CAP 949 230 MACHINE SCREW M4X50 10 PCS 949 453 SPRING WASHER M4 10 PCS 949 423 WASHER 10 PCS 883 897 HOLDER SHAFT 945 255 U NUT M5 878 164 SLEEVE 880 398 RATCHET SPRING 883 896 NAIL HOLDER 883 895 MAGAZINE 883 111 PIN 876 465 NYLON NUT M4 3 02 ALTERNATIVE PARTS 3 PARTS CODE NO 883 898 DESCRIPTION MAGAZINE GUARD REMARKS NV 45AB2 878 213 PLATE NUT FOR USA 878 176 GUIDE BASE FOR USA
19. CASI UP o o 12 4 6 20 Gin 5 6 7 8 85 1 I kgf cm T Nail dxL 09 60 70 80 90 100 110 120 psi mmxmm Air pressure setting to drive nail flush with NV45AB2 11 Fig 2 Required nailing energy and nailer output energy Size of Nail mm in 3 05x32 12 x1 1 4 4 3 05x38 12 x1 1 2 4 3 05x45 12 x1 3 4 4 5 4 Optional Accessories Sequential trip mechanism kit Single shot Code No 878226 A sequential trip mechanism kit is provided as an optional accessory for the Model NV 45AB2 By using this optional accessory a nail is driven by pressing the pushing lever first against a workpiece and then pulling the trigger single shot operation and no nail is driven when pulling the trigger first and then pressing the pushing lever against a workpiece Please recommend the sequential trip mechanism kit to the customers who want to use it Salespersons must instruct the customers to read the Handling Instructions attached to the sequential trip mechanism kit and also the Handling Instructions of the Model NV 45AB2 thoroughly for correct use 8 1 1 L 8 1 8 Z 1 8 Bua er Uu 61 Gp zz gg 61 er Uu 61 er WW 22 Sp WW 22 LOS LO LS LO so g LOS UO 90 LOS UO 90 LS LO
20. D3 x 28 85 Bolt 77 Main Nail Stopper 86 Fig 18 33 O After removing the Hex Socket Hd Bolt M4 x 6 84 the Nail guide Cover 89 Main Stopper Spring 83 and Sub Stopper Spring 88 can be taken out After removing the Roll Pin D3 x 28 85 the Main Nail Stopper 86 and Nail Stopper 87 can be taken out O To disassemble the guide lock portion extract the Roll Pin D3 x 10 81 and take off the Lock Shaft 79 The Guide Lock 80 and Spring 82 can then be taken off O Turn the Adjuster 75 counterclockwise pulling toward the lower end of the Nose 32 Then the Bolt 77 can be removed from the Nose 32 and the Adjuster 75 Adjuster Spring 76 and Bolt 77 can be removed in a unit Flat blade screwdriver Nail Guide Shaft 74 Pliers Fig 19 b Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse However special attention should be given to the following items Prior to reassembly thoroughly remove tar dirt and other foreign matter from the latch groove on the Nail Guide 78 O When reassembling the Main Stopper Spring 83 and Sub Stopper Spring 88 carefully ensure that they are properly inserted into the holes on the Main Nail Stopper 86 and Nail Stopper 87 O On completion of reassembly push up the Main Nail Stopper 86 and Nail Stopper 87 by hand and confirm that they return smoothly O Mount the Adjuster 75
21. ER GUIDE 877 124 CYLINDER O RING B 878 184 WARNING LABEL 883 889 BODY ASS Y 878 183 WARNING LABEL 877 125 CYLINDER O RING C 878 179 PISTON BUMPER 877 993 BUMPER SHEET 883 881 GASKET A 949 818 HEX SOCKET HD BOLT M5X8 10 PCS 878 151 GUARD 883 880 NOSE 878 173 NOSE GUARD 878 181 NYLOCK HEX SOCKET HD BOLT M5X16 878 178 SPRING 875 650 SAFETY BOLT 949 555 NUT M5 10 PCS 883 888 PUSHING LEVER 949 242 MACHINE SCREW M5X22 10 PCS 876 205 WASHER GRIP RUBBER 877 131 GASKET D 880 036 949 821 HEX SOCKET HD BOLT M5X16 10 PCS 872 035 DUST CAP NAME PLATE 949 866 ROLL PIN D3X30 10 PCS 875 643 PLUNGER SPRING 874 820 PLUNGER O RING 878 155 PLUNGER A 878 166 VALVE BUSHING 2 ALTERNATIVE PARTS 3 02 FOR EUROPE OI N j INCLUD 41 FOR EUROPE SUPPLIED WITH ITEM NO 602 603 N N ad G sch sch 2 A lt lt N lt lt 1 0 N Mil 2 sch lt lt PARTS NV 45AB2 CODE NO DESCRIPTION REMARKS 875 638 O RING 5 12 878 734 VALVE PACKING 875 645 URETHANE BALL C 07 14 875 644 VALVE PLATE 877 335 TRIGGER VALVE BUSHING 878 121 TRIGGER PLUNGER 876 203 TRIGGER 878 171 PLUNGER
22. Nose 32 and Magazine Ass y 109 in accordance with the following procedures I First assemble the Nose 32 and Pushing Lever 38 Then fasten Body Ass y 24 and the Nose 32 with the four Nylock Hex Socket Hd Bolts M5 x 16 34 and tighten them to rated torque II Fasten the Pushing Lever 38 with the Roll Pin D3 x 30 47 HD With the Magazine Bushing 67 assemble the Nose 32 and Magazine Ass y 109 and confirm that they are securely fastened Then fasten the Magazine Ass y 109 to Body Ass y 24 with the Machine Screw M5 x 22 39 O Confirm that each fastening nut and screw is tightened to rated torque as set forth in paragraph 10 1 26 Piston Bumper 27 Damper sheet 28 Semi circular groove Driver blade Groove Side portion of driver blade Semi circular groove Piston H 13 Driver blade Bumper Sheet 28 Fig 11 2 Cylinder 17 Piston H 13 and related parts Tools required O Hex bar wrench 4 mm O Phillips screwdriver O Roll pin puller 3 mm 0 118 a Disassembly See Figs 12 and 13 O As described in paragraph 10 2 1 disassemble the nose portion and remove the Bumper Sheet 28 from the Piston Bumper 27 O After removing the four Hex socket Hd Bolts M5 x 20 5 and Exhaust Cover B 4 Piston H 13 can be disassembled O Next insert two of the Hex Socket Hd Bolts M5 x 20 5 into the provided threaded holes in the Cylinder
23. Wire collated nails Min Max 10 5 mm 10 5 mm 0 413 0 413 gt E E 2 CN E E 3 05 mm 2 0 120 3 05 mm 0 120 Fig 1 Dimensions of nails 5 3 Nail Driving Force Fig 2 shows by type of wood and nail the nailer output energy provided by the supply pressure and the nailing energy required for driving the nail flush Air pressure which exceeds the intersecting point between the nailer output energy and the required nailing energy for driving the nail allows the nail to be fully driven For example when driving a nail of 3 05 mm dia x 45 mm length 0 120 x 1 3 4 into a workpiece of hemlock with the Model NV 45AB2 a pressure of about 6 5 bar 6 6 kgf cm 94 psi allows the nailer to drive the nail flush with the wood surface A pressure beyond this value causes the nail head to be driven below the wood surface Fig 2 should be used as reference only because those values vary depending on the type of wood moisture content and grain of wood Required nailing energy Nailer output energy ftlb J J 40 n soo 99 i sool 50 PS E EL HITACHI NV 45AB2 v HITACHI NV 45AB A 30 OG soo 40 aoo 40 30 7 1 3 E E soot 30 520 Hemlock f ui 2000 20 200 20 10 100 10 40 60 80 100 120 140 mm0 0 0 zur 5 6 7 8 83 bar 1 MIL REM 260 TM TERMED
24. azine 100 If the Guide Base 105 is mounted first the Nylon Nut M4 102 cannot be mounted to the Magazine 100 O Be careful of each tightening torque Refer to paragraph 10 1 11 INSPECTION AND CONFIRMATION AFTER REASSEMBLY Check that Plunger B 59 and Trigger Plunger 57 move smoothly e Check that there is no air leakage from each part e Ensure that the Main Nail Stopper 86 Nail Stopper 87 and Feeder A 70 return properly when they are pushed with a finger Confirm that the Feed Piston 63 and Piston H 13 return properly when the nailer is operated with an air pressure of 5 kg cm 70 psi Conduct check under the idle driving condition with the nail guide open Operate the nailer with an air pressure of 5 kg cm 70 psi and confirm that there is no abnormal driving or bending of nails Note Before conducting the driving test turn the Adjuster 75 to the deepest position Recheck the tightening torque of each screw Check that the Pushing Lever 38 slides smoothly Check that the machine will not operate only by actuating the Trigger 58 Also check that the machine will not operate only by depressing the Pushing Lever 38 12 STANDARD REPAIR TIME UNIT SCHEDULES MODEL Fixed Variable 10 20 30 40 50 60 min General Assembly Work Flow Cylinder Plate Pushing Lever Spring Feeder A Adjuster Feed Pisto
25. e Inspection priorities In the table below possible causes of air leakage and their repair procedures are marked in accordance with the likelihood of possible failure 1 First priority items are marked with an asterisk x 2 Second priority items seal portions are marked with a double circle 3 Remaining items are marked with a single circle See Parts List and exploded assembly diagram for part name and location Cause Air leak part 7 i When trigger valve When trigger valve ON When tri Ive safet OFF EE safety valve are ON safety valve OFF x Cylinder 17 does not return Defective Exhaust Valve Exhaust vent o Swollen Cylinder O ring D 15 Use of unsuitable oil causes swelling Advise the customer to use Shell Tonna Oil S32 O Deformed Cylinder 17 or Cylinder Guide 21 O Yielded or broken Cylinder Spring 19 Defective Head Cap 11 worn rubber portion or broken Broken Gaskets 9 O Loose Hex Socket Hd Bolt M5 x 25 1 O Broken Exhaust Cover B 4 10 worn deformed or broken Exhaust cover O Loose Hex Socket Hd Bolt M5 x 25 1 Broken Gasket F 8 O Damaged seal surfaces of Body Ass y 24 and Exhaust Cover B 4 2 Broken or deformed Nose Gasket A 29 OLoose Nylock Hex Socket Hd Bolt M5 x 16 34 Air will leak slightly from around adjustment bolt Nose due to construction
26. e abnormal part e Apply grease 2 Nails are driven but bent Nails are not completely fed into the injection port Unspecified nails are used See item 1 See item 1 Xe Driver blade is worn Check that the driver blade tip is not abnormally worn Replace the part Workpiece is too hard Check if a nail is bent even when driven into soft wood Nailer cannot be used because the material is beyond its applicable range zog Problem Possible cause x most common cause Inspection method Remedy 3 Nails cannot be driven into the workpiece completely the heads cannot be made flush Adjuster is incorrectly set e Turn the adjuster to the deepest driving position and then drive nails e Set the adjuster to the optimum position e Air pressure is too low Adjust air pressure to 4 9 8 3 bar 5 8 5 kgf cm 70 120 psi Workpiece is too hard Check if a nail is bent even when driven into soft wood Nailer cannot be used because the material is beyond its applicable range Driver blade is worn Perform idle driving to check the driver blade is projected from the nose tip e Replace the part xe Piston O ring is abnormal worn or damaged e Cylinder inside surface is abnormal worn or rough e Cylinder O ring is abnormal worn or damaged e Sliding surface of the circumfe
27. e of the pneumatic nailer are listed in the Instruction Manual to enhance the safe efficient use of the tool by the customer Salespersons must be thoroughly familiar with the contents of the Instruction Manual to be able to offer appropriate guidance to the customers during sales promotion 7 2 Warning Label Each Model NV 45AB2 unit is provided with a Warning Label illustrated below which lists basic safety precautions in its use Carefully ensure that customers fully understand and follow these precautions before using the tool A DANGER READ AND UNDERSTAND INSTRUCTION AND SAFETY MANUAL before use Failure to follow instructions WILL RESULT IN SERIOUS INJURY OR DEATH eOperator and others work area MUST WEAR ANSI REQUIRED 287 1 EYE PROTECTOR WITH SIDE SHIELDS eNEVER USE BOTTLED GASES Use regulated air only i dic L eDO NOT EXCEED 120psi 8 3bar e NEVER CARRY WITH FINGER ON TRIGGER eDISCONNECT AIR before servicing unjamming or when not in use 315808 7 3 Related Laws and Regulations As nailers and staplers are designed to instantaneously drive nails and staples there is an ever present danger of misfiring and subsequent possible serious injury Accordingly close attention in handling is absolutely necessary at all times Carefully ensure that the customer is fully aware of the precautions listed in the Instruction Manual provided with each unit While there are no specific safety regulations there ar
28. e related items in various general safety regulations with which the salespersons should be familiar in order to properly advise the customer Please check your national and or local regulations for applicable items Some applicable items are outlined below The U S A OSHA 1926 102 Eye and face protection 1926 302 Power operated hand tools ANSI SNT 101 1993 Portable Compressed Air Actuated Fastener Driving Tools Safety Requirements for 8 MECHANISM AND OPERATION PRINCIPLE 8 1 Mechanism As illustrated in Fig 3 the Model NV 45AB2 can be generally divided into four sections output section control valve section driving section and magazine section Although the output section and the valve section are basically common to those of the Model NV 45AB most of the parts of the driving section and the magazine section have been newly designed Primary differences from the Model NV 45AB are described below e Output section The handle employs a grip rubber Model NV 45AB grip tape The body guard has been newly designed to mount the non slip protector e Driving section The nose nail guide shaft etc have been newly designed to adopt the tool less adjuster e Magazine section Most of the parts of the magazine section have been newly designed to make the magazine top loading type The Bold numbers in the figure below correspond to the numbers in 8 2 Operation Principle Accumulator 1
29. ecified nails are used Check the nails as follows Use specified nails e Remove the abnormal nails and load the nailer with proper nails UNIT mm inch 7 16 0 276 0 630 7 25 0 630 0 984 lt Body Nail feeding is incomplete Feeder is worn and the sliding section is abnormal Nail guide face of the nose or the sliding section of the feeder is abnormal deformed burrs or damaged 9 Spring or feeder spring is abnormal damaged fatigued or removed Open the nail guide and check the position of the feeder claw Check that the feeder claw holds a nail and the first nail is positioned in the injection port Check that the second claw holds the nail shaft and feeds it Replace the abnormal part e x Foreign matter enters in the feed piston chamber Remove the foreign matter from the feed piston chamber lt Body Nail guide section gt e Nail guide section is abnormal 9 See item 1 Nail guide section See item 1 Nail guide section Driver blade is not returned completely See item 1 Output section piston driver blade etc e Perform idle or actual driving to check if the driver blade is returned completely See item 1 Output section piston driver blade etc 20 9 2 Possible Causes and Corrections of Air Leakage Air leakage repair location Fig 8 E
30. ent securely tighten the Nut M5 37 Plunger A 501 Plunger B 59 Nut M5 37 Pushing Lever 38 e 6 olo pH N T Nose 32 Fig 17 22932 10 4 Disassembly and Reassembly of the Driving Section 1 Nail guide portion and adjuster portion Tools required O Hex bar wrench 3 mm 4 mm O Phillips screwdriver O Roll pin puller 8 mm 0 118 O Pliers a Disassembly See Figs 18 and 19 O By following the procedures in paragraph 10 2 1 a disassemble the Pushing Lever 38 from the main body O Next pinch the lower tip of the Nail Guide Shaft 74 with pliers and pull down Fig 19 a Then the Shaft Ring 73 can be removed from the Nail Guide Shaft 74 and the Nail Guide Shaft 74 can be pulled out of the Nose 32 The entire nail guide section can be removed from the Nose 32 Do not remove the Nail Guide Shaft 74 with a flat blade screwdriver as shown in Fig 19 b Otherwise the Adjuster 75 may be scratched Take out the removed Shaft Ring 73 from between the Adjuster 75 and the Nose 32 Nail Guide 78 Lock Shaft 79 Guide Lock 80 Roll Pin D3 x 10 81 Nose 32 Spring 82 Shaft Ring 73 _ Main Stopper Spring 83 Hex Socket Hd Bolt Nail Guide Shaft 74 M4 x 6 84 Adjuster 75 Adjuster Spring 76 Nail Guide Cover 89 Sub Stopper Spring 88 Nail Stopper 87 Roll Pin
31. he driving section and the magazine section have been newly designed The parts listed below are not interchangeable with the Model NV 45AB The Bold numbers in the descriptions below correspond to the item numbers in the Parts List Part NV 45AB2 Body Ass y 24 The mounting portion of the magazine is different in shape Grip rubber Mounting portion of the magazine is thickened No difference e A protrusion is provided at the mounting portion of the adjuster Nose 32 Mounting portion of the adjuster NV 45AB Grip tape Mounting portion of the magazine is not thickened There is a difference Spare parts will be unified to the ones for the Model NV 45AB2 Gasket A 29 Thickness 0 5 mm e Thickness 0 4 mm Mounting portion of the bolt Feeder A 70 e The hooks are different in shape 2 slopes 0 1 2 5 mm Spare parts will be unified to the ones for the Model NV 45AB2 mm 0 2 1 slope E NV 45AB2 NV 45AB Nail Guide Shaft A groove for mounting the shaft ring is provided Nail Guide 78 e A protrusion for holding the magazine cover is provided Protrusion Magazine Ass y Top loading type 109 The newly designed nail guide is required to close the magazine cover It can be mounted to the newly designed body only Following parts are common to the Model NV 45AB P
32. late Nut 104 Guide Base 105 Shingle Guide 107 Hex Socket Hd Bolt M5x10 108 e Bottom loading type 15 9 TROUBLESHOOTING GUIDE 9 1 Troubleshooting and Correction Problem Possible cause x most common cause Inspection method Remedy 1 Nails cannot be driven Nails e Magazine is not loaded with specified genuine nails e Magazine is loaded with abnormal nails bent nails too large or too small nail heads abnormal collation others e Nails or link pieces are jammed Link pieces are deformed or broken Check that the magazine is correctly loaded with specified nails Use specified nails e Remove the abnormal nails and load the nailer with proper nails Driving section Nose feeder feed piston etc Sliding resistance of the feed piston is too high Remove the feed piston and check the feed piston sliding surface of the nose e Apply grease to the sliding surface Polish the scratched portion with sandpaper Replace the parts e Nail guide face of the nose is abnormal deformed burrs or damaged e Spring or feeder spring is abnromal damaged or fatigued e Feeder is abnormal damaged or worn e Check that the driving section is not abnormal burrs deformed damaged or worn Deburr the nail guide face Correct the deformed parts Replace the abnormal parts 9 Nails are not correctly loaded i
33. ly ensure that when Plunger B 59 is pushed up with a finger and released it smoothly returns to its original portion 30 Body Ass y 24 e Valve Packing 53 O Urethane Ball C 07 14 54 Plunger Spring 48 ungerspng piel 8 e9 O Ring 5 12 52 DL Valve Plate 55 8 Trigger Valve Bushing 56 Trigger Plunger 57 Plunger A 50 Valve Bushing 51 lt LS O Ring S 12 52 Plunger O Ring 49 EEA Trigger 58 Roll Pin D3 x 30 47 Plunger B 59 Valve Rubber Cover 60 Fig 15 Valve Bushing 51 Groove Valve Rubber Cover 60 Plunger B 59 Groove agis 2 Adjustment of Safety Bolt 36 See Fig 17 Tool required O 8 mm 0 315 spanner a To adjust the Safety Bolt 36 loosen the Nut M5 37 and turn the Safety Bolt 36 b Perform adjustment so that the distance between the bottom end of the Nose 32 and the bottom end of the Pushing Lever 38 is 5 0 5 mm 0 197 0 020 when the Pushing Lever 38 is pushed up so that Safety Bolt 36 pushes up Plunger B 59 to a position where it in turn begins to push up Plunger A 50 When Plunger B 59 is pushed upward you will feel the slight resistance when it reaches the position where it begins to push up Plunger A 50 c On completion of adjustm
34. ly aligned with the matching holes in Body Ass y 24 3 Head Cap 11 and related parts See Fig 12 a Disassembly O Remove Exhaust Cover 11 Refer to paragraph 10 2 2 O Remove the two Hex Socket Hd Bolts M5 x 25 1 and disassemble Head Cap 11 Exhaust Valve 10 and Gasket G 9 b Reassembly O Reassembly can be accomplished by following the disassembly procedures in reverse However special attention should be given to the following items O Ensure that the air vent holes in Gasket G 9 are properly aligned with the matching holes in Head Cap 11 and Exhaust Cover B 4 4 Grip Rubber O The Grip Rubber 41 assembled in the Body Ass y 24 is not supplied singly because the disassembly and reassembly are not easy When replacement of the Grip Rubber 41 is required replace the Body Ass y 24 Body Ass y 24 comes with the Grip Rubber 41 or install grip tape A according to the following procedure O Installation of grip tape A and tape Adhere the adhesive backed grip tape A and the tape to the Body Ass y 24 First adhere the end of grip tape A under the trigger valve of the Body Ass y 24 and wind around the Body Ass y 24 Wind the Tape at both ends of grip tape A see Fig 14 Be careful that grip tape A and tape cannot be removed once they are adhered End of grip tape A End of grip tape A j Trigger valve Griptape j Fig 14 29 10 3 Disassembly a
35. m 70 120 psi 4 9 8 3 bar Gauge pressure Driving speed Min 3 pcs sec Weight 2 5 kg 5 5 155 Dimensions Length x Height x Width 250 mm x 264 mm x 117 mm 9 27 32 x 10 3 8 x 4 5 8 Nail feed system Reciprocating piston type Nail capacity 120 1 roll Air consumption 1 3 Itr cycle at 7 kgf cm 046 ft cycle at 100 psi 1 3 Itr cycle at 6 9 bar Air inlet 3 8 NPT thread Packaging Corrugated cardboard box Packaging dimensions Length x Height x Width 335 mm x 155 mm x 320 mm 13 3 16 x 1 1 8 x 12 5 8 Standard accessories Hex bar wrench for M4 screw Code No 943277 Hex bar wrench for M5 screw Code No 944458 Eye protector Code No 875769 Optional accessories Sequential trip mechanism kit Single shot Code No 878226 Pneumatic tool lubricant 1 oz oil feeder Code No 877153 9 Pneumatic tool lubricant 4 oz oil feeder Code No 874042 e Pneumatic tool lubricant 1 Code No 876212 5 2 Nail Selection The Model NV 45AB2 utilizes roofing nails which are common round head nails collated by wire into coils from 120 nails Applicable nail dimensions are shown below However it is recommended to use genuine HITACHI nails to ensure satisfactory driving quality CAUTION Ensure that nails are as specified in Fig 1 Other nails will cause clogging of nails and subsequent damage to the nailer
36. m for NV 45AB2 1 PRODUCT NAME Hitachi 1 3 4 Coil Nailer Model NV 45AB2 2 MARKETING OBJECTIVE The current Model NV 45AB coil nailer is well reputed in the U S A market as a roofing nailer suitable for roofing asphalt shingles in building construction However competitively priced roofing nailers have been put on the U S A market recently The newly introduced Model NV 45AB2 is developed by making minor changes to the Model NV 45AB to meet the market demands The output section is basically common to that of the Model NV 45AB and the 2 valve cylinder drive system that is well reputed for quick driving is adopted To meet the market demands the Model NV 45AB2 is equipped with a tool less nailing depth adjuster top loading magazine non slip rubber etc Applicable nails are the same as those of the Model NV 45AB The Model NV 45AB2 weighs only 2 5 kg same as the Model NV 45AB 3 APPLICATIONS e Installation of asphalt roofing shingles in building construction e Installation of insulation boards in building construction 4 SELLING POINTS Quick driving 2 valve cylinder drive system Non slip rubber Grip rubber Tool less adjuster Top loading magazine Lightweight 2 5 kg 5 5 Ibs Large carbide chip 1 Output section The basic construction is the same as that of the Model NV 45AB except the 2 valve cylinder drive system that is well
37. n O ring x 3 Feed Piston Piston H Cover Piston O ring Exhaust Cover B Exhaust Valve Head Cap Trigger Plunger Plunger A Plunger Spring Valve Packing Urethane Ball O ring x 5 Adjustment Cylinder Body Valve Oylinder Guide Oylinder Oylinder Ring O ring x 7 Piston Bumper Tail Cover Nail Guide Guide Lock Main Nail Stopper Nail Stopper Nail Guide Cover Magazine Ass y Body 40 LIST E004 LIST PNEUMATIC TOOL PARTS 2002 3 15 E1 Model NV 45AB2 M S E A 2 Q N d Vi 9 Q amp N lie gj eee gt EN 4 5 A act 799599 ig 5 lt S use PARTS NV 45AB2 CODE NO DESCRIPTION REMARKS 949 662 HEX SOCKET HD BOLT M5X25 10 PCS 876 179 TOP COVER 883 513 WARNING LABEL A 880 275 EXHAUST COVER B 949 757 HEX SOCKET HD BOLT M5X20 10 PCS 883 891 PROTECTOR 883 890 BODY GUARD 883 892 GASKET F 876 713 GASKET G 878 417 EXHAUST VALVE 876 711 HEAD CAP 876 174 PISTON O RING 878 156 PISTON H 876 161 O RING 5 65 877 126 CYLINDER O RING D 876 168 CYLINDER PLATE 877 486 CYLINDER 876 167 CYLINDER RING 876 172 CYLINDER SPRING 877 123 CYLINDER O RING A 877 122 CYLIND
38. n the groove of the nose e Check that nails are correctly loaded in the groove of the nose e Load nails in the correct position in the nose xe Dust sticks to the feeder sliding portion of the nose or lubrication is needed Air pressure is too low Air passage is clogged with broken pieces of piston bumper etc Feeder piston chamber contains foreign matter such as broken pieces of piston bumper etc e Open the nail guide and perform idle driving to check the feeder s operation Remove dust and then lubricate the sliding surface e Adjust the air pressure to 4 9 8 3 bar 5 8 5 kgf cm 70 120 psi Remove foreign matter Replace the piston bumper with new one Body Remove foreign matter in the return air chamber e Nose Remove foreign matter in the air passage and the feed piston chamber 246 Problem Possible cause x most common cause Inspection method Remedy 1 Nails cannot be driven Air leaks from Gasket A or Gasket E O rings are worn or deformed O rings need lubrication Tighten screws and replace gaskets Replace the O rings Apply grease or lubricate Nail guide section Nail guide face is abnormal deformed burrs or damaged e Check that the nail guide is not abnormal worn deformed damaged etc Correct or replace the parts
39. nd Reassembly of the Valve Section See Figs 15 and 16 1 Trigger Valve Bushing 56 Valve Bushing 51 and related parts Tools required O Roll pin puller 3 mm 0 118 O Flat blade screwdriver O Phillips screwdriver O Hex bar wrench 4 mm a Disassembly O Disassemble the magazine section and nose portion from the main body Refer to paragraph 10 2 1 a O Extract the Roll Pin D3 x 30 47 and remove the Trigger 58 Trigger Plunger 57 and Plunger B 59 O Insert the flat blade screwdriver into the groove on the Trigger Valve Bushing 56 and while being very careful not to damage the groove turn it counterclockwise to loosen it O Next extract the Trigger Valve Bushing 56 and Valve Bushing 51 b Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse However special attention should be given to the following items O Thoroughly remove any tar or dirt which may be stuck on the tip of the Nose 32 and the inside sliding portion of the Pushing Lever 38 O Pay particular attention not to twist the Plunger Spring 48 and break or damage the O Rings O After mounting the Valve Rubber Cover 60 on Plunger B 59 reassemble Plunger B 59 into the Valve Bushing 51 As illustrated in Fig 15 ensure that the lips of the Valve Rubber Cover 60 are properly inserted into the grooves provided between the Valve Bushing 51 and Plunger B 59 O On completion of reassemb
40. nd no air pressure is applied to the valve air passage Compressed air is applied to the right side surface of the feed piston through the passage from the accumulator and moves the feed piston to the left Fig 4 e 2 When the trigger and pushing lever are operated D Compressed air is applied to the upper side of the D Although air pressure is applied to both the Exhaust Valve 4 forcing it upper and lower surfaces of the cylinder the downward and closing cylinder is forced downward due to the larger Sylinder ring the Exhaust Vent 5 effective area of the upper surface Accordingly the upper portion of the cylinder is opened and the compressed air forces the piston downward B When the trigger and pushing lever are operated simultaneously the safety valve and trigger valve are opened A The trigger and pushing lever are operated simultaneously Note If either the trigger or pushing lever is operated individually compressed air will not enter the valve air passage and the nailer will not function When the trigger and pushing lever are operated simultaneously the exhaust vents are closed 24 E Because of the larger effective area the air pressure appied to the left side surface of the feed piston overcomes the air pressure on the right side and moves the feed piston to the right When the cylinder moves down compressed air Fur from the head cap g y E As the
41. odel NV 50AA and NV 5041 be very careful to ensure that parts from other models are not inadvertently assembled on the Model NV 45AB2 Inadvertent assembly of such parts could result in malfunction misfiring etc and is very hazardous e Apply grease Nippeco SEP 3A Code No 930035 to the O rings and O rings sliding portions When installing the O rings be careful not to damage the O rings and prevent dirt entry e Coat a small amount of grease a silicone based grease is recommended on the sliding portions of the nail feeding section e Oil required Hitachi pneumatic tool lubricant 1 oz 30 cc oil feeder Code No 877153 4 02 120 cc oil feeder Code No 874042 1 quart 1 Itr can Code No 876212 f the packings are damaged replace them and ensure that there is no air leakage after repair Be especially careful to prevent the entry of foreign particles into the control valve section Use the conventional grip tape for repair of the grip rubber because the grip rubber cannot be mounted without the specifically designed jig Tightening torque for each part Tightening torque Bolt and screw N m kgf cm ft lb Hex Socket Hd Bolt 5 x 25 1 Hex Socket Hd Bolt 5 x 16 44 6 4 0 5 65 5 4 7 0 4 Hex Socket Hd Bolt M5 x 10 108 Hex Socket Bolt 5 x 20 5 Hex Socket Hd
42. ools required O Hex bar wrench 4 mm O Phillips screwdriver a Disassembly O By following the procedures in paragraph 10 2 1 a disassemble the Magazine Ass y 109 from the output section O Remove the Magazine Bushing 67 from the Nose 32 O Remove the Hex Socket Hd Bolt M5 x 8 30 and detach the Guard 31 from the Nose 32 O After removing the Hex Socket Hd Bolt M5 x 10 68 the Feed Piston Cover 66 and Gasket E 65 can be taken out O Remove the Feeder Shaft Ring 72 from the Feeder Shaft 71 and extract the Feeder Shaft 71 from the Feed Piston 63 The Feeder A 70 and Feeder Spring 69 can then be removed O Next the Feed Piston 63 can be taken out of the Nose 32 35 b Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse However special attention should be given to the following items O Prior to reassembly thoroughly remove any tar or dirt which may be stuck on the Guard 31 or on the sliding portion of the Feeder A 70 O Assemble the Feeder Shaft Ring 72 onto the Feeder Shaft 71 so that the chamfered inner surface is facing toward the Feeder Spring 69 side O Ensure that the hooked portions at both ends of the Feeder Spring 69 are properly inserted into the provided grooves on Feeder A 70 O Prior to reassembly coat grease on the O Ring P 9 61 the Feed Piston O Rings 62 64 and the O Ring sliding portions of
43. per end of the cylinder and the cylinder is pushed upward by the air pressure on the lower surfaces of the flanges and the force of the Cylinder Spring 8 This closes the upper end of the cylinder and blocks further compressed air from entering the cylinder A When the trigger is released the trigger valve closes and the compressed air does not flow into the air passage The air pressure within the valve air passage is discharged through Valve Exhaust Vent T In addition when the pushing lever is lifted from the wood surface the safety valve closes and the air pressure within the valve air passage is discharged through Valve Exhaust Vent ID The illustration shows both the trigger and pushing lever released E At the time the piston returns any remaining air pressure at the lower end of the piston is discharged through the clearance between the Piston Bumper 7 and the Driver Blade 9 Note If the clearance were any larger the piston would not return if it were smaller driving force would be decreased F As the air pressure at the left side surface of the feed piston is reduced the air pressure at the right side surface moves the feed piston toward the ejecting gate and the next nail is fed into firing position by the feeder Fig 7 243 5 6 3 Interchangeability Although the output section and the control valve section are basically common to those of the Model NV 45AB most of the parts of t
44. rence of the cylinder is abnormal worn or damaged Disassemble the output section and check inside and outside surfaces of the O ring and the cylinder for abnormality Replace the abnormal part xe Short of oil on both inside and outside surfaces of the cylinder worn or damaged e Check for shortage of grease on the sliding surface of the O ring e Apply grease e Exhaust valve is abnormal or short of oil worn or scratches on seat side Disassemble the exhaust valve section and check for abnormality or shortage of oil Apply grease Replace the abnormal part e Safety belt is not adjusted properly Check that the distance between the lower end of the nose and the lower end of the pushing lever is 5 0 5 mm 0 197 0 020 under the following conditions 9 Pull up plunger B until it contacts plunger A e Pull up the pushing lever until plunger B contacts the safety bolt Readjust the safety bolt according to 10 3 2 aos Problem Possible cause x most common cause Inspection method Remedy 4 Nails jam Nails xe Unspecified nails are used x e Abnormal nails are mixed x e Nail heads are too large or too small Collating wires are abnormal broken welding failed deformed or welding position failed x e Collating wires are deformed deformed in collation angle or collation pitch Check if the sp
45. sassembly See Fig 23 Remove the Machine Screw M5 x 22 39 from the Body Ass y 24 Then the Magazine Ass y 109 can be removed O Push out the Pin 101 using a roll pin puller 4 mm 0 157 Then the Magazine Cover 90 and the Feeder Shaft Ring 72 that prevents the Pin 101 from coming off can be removed O Insert a small flat blade screwdriver between the Holder Cap 91 and the Nail Holder 99 to widen the clearance Then the Holder Cap 91 can be removed Fig 23 At this time be careful not to scratch the Nail Holder 99 and the Holder Cap 91 Remove the Machine Screw M4 x 50 Then the Holder Shaft 95 Nail Holder 99 and other parts can be removed O Put the small flat blade screwdriver on the end of the Ratchet Spring 98 and push the Ratchet Spring 98 out of the groove on the Nail Holder 99 b Reassembly O Disassembly procedures should be followed in the reverse order O Drop the Feeder Shaft Ring 72 in the groove at the center of the hinge of the Magazine Cover 90 and put the Pin 101 through the hole of the hinge before mounting the Magazine Cover 90 to the Magazine 100 After reassembly check that the Feeder Shaft Ring 72 fits in the notch at the center of the Pin 101 Holder Cap 91 Small flat blade Nail Holder 99 E screwdriver Fig 23 se Cap 43 Hex Socket Hd Bolt M5 x 16 44 Gasket D b Washer 40 Machine Screw M5 x 22 1 Magazine Cover 90
46. ton driver blade etc e Air pressure is too low xe Piston O ring is abnormal worn or damaged xe Piston bumper or bumper sheet is abnormal 9 Cylinder ring is abnormal removed deformed or damaged e Driver blade is abnormal deformed burrs or damaged e Open the nail guide and perform idle driving to check that the driver blade is returned e Adjust the air pressure to 4 9 8 3 bar 5 8 5 kgf cm 70 120 psi Replace the O ring Replace the piston bumper or bumper sheet Reassemble or replace the parts Correct or replace the parts Cylinder inside surface is abnormal packed with dust or worn Check that nails can be driven at 4 9 bar 5 kgf cm 70 psi Remove dust and then lubricate Replace the part Sliding surface between the cylinder and the cylinder guide or sliding surface between the cylinder and the cylinder plate is abnormal seized or damaged or lubrication is needed lt Control valve section e Trigger plunger plunger A B trigger valve bushing valve bushing or urethane ball C is abnormal seized or damaged Perform idle driving to check the driving operation Replace the part Apply grease Replace the abnormal part e O ring or sliding surface is worn or needs lubrication Disassemble the control valve section and check the O rings Replace th
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