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strip nailer nr 90ac2

1. 7 8 MECHANISM AND OPERATION PRINCIPLE J 8 8 8 2 Interchangeability 9 uu E EET 11 9 TROUBLESHOOTING GUIDE dass dan uad aad d 13 9 1 Iroubleshooli ng COCO R o o D 13 9 2 Possible Causes and Corrections of Air Leakage Vs 16 10 DISASSEMBLY AND REASSEMBEY P dE aru 18 10 1 General Precautions in Disassembly and Reassembly 18 10 2 Disassembly and Reassembly of the Output Section 19 10 3 Disassembly and Reassembly of the Control Valve Section See Fig 12 21 10 4 Disassembly and Reassembly of the Driving Section See Fig 16 24 10 5 Disassembly and Reassembly of the Cap and the Magazine Section 25 11 INSPECTION AND CONFIRMATION AFTER REASSEMBLY 28 12 STANDARD REPAIR TIME UNIT SCHEDULES 29 Assembly Diagram for NR 90AC2 1 PRODUCT NAME Hitachi 90 mm 3 12 Strip Nailer Model NR 90AC2 2 MARKETING OBJECTIVE The Mod
2. 878 884 PLUNGER SPRING 58 880 673 PLUNGER A 59 878 888 O RING 1 0 1 8 60 880 671 VALVE BUSHING A 61 949 759 HEX SOCKET HD BOLT M8X30 10 PCS 62 883 690 CONNECTOR 63 883 682 NAIL RAIL 64 883 689 HANDLE ARM 65 963 837 NYLON NUT M6 66 883 499 SLEEVE 67 883 683 MAGAZINE COVER 68 883 685 NAIL FEEDER A 69 949 688 ROLL PIN D4X40 10 PCS 70 883 687 SPRING 71 883 688 PUSHING LEVER STOPPER 72 883 686 NAIL FEEDER B 73 949 776 ROLL PIN D3X10 10 PCS 74 883 503 RIBBON SPRING 75 943 364 NEEDLE ROLLER D4X20 76 883 681 MAGAZINE 77 984 443 HEX SOCKET HD BOLT W FLANGE M6X12 78 883 684 NAIL STOPPER ALTERNATIVE PARTS STANDARD ACCESSORIES NR 90AC2 Heu CODE NO DESCRIPTION Ka 881 968 NOSE CAP 944 458 HEX BAR WRENCH 4MM 944 459 HEX BAR WRENCH 5MM 872 422 HEX BAR WRENCH 6MM 875 769 EYE PROTECTOR 881 976 CAUTION TAG 882 414 LEAFLET OPTIONAL ACCESSORIES E _ 881 973 SEQUENTIAL TRIP MECHANISM SET sd ALTERNATIVE PARTS Printed in Japan 9 01 010905N Hitachi Koki Co Ltd Tokyo Japan
3. 28 Collar B 29 Protruded _ gt NR 90AC 13 3 mm 0 524 NR 90AC 10 mm 0 394 10 8 3 Operation Principle 1 Before nailing See Fig 5 and Fig 6 1 When compressed air is fed to the main body it fills the accumulator portion 2 At the same time the compressed air flows into the valve piston lower chamber of the control valve section and forces Valve Piston B 54 upward Compressed air is then fed through the air supply vent and air passage to the head valve chamber As a result the Head Valve Spring 8 is pushed down to seal the Head Valve 10 and Cylinder 17 2 When nailing See Fig 4 and Fig 5 1 When Pushing Lever A 37 and Trigger A 46 are operated together and Plunger A 58 is pushed upward the compressed air in the valve piston lower chamber is discharged from the bottom of Plunger A 58 As a result the compressed air in the accumulator pushes down Valve Piston B 54 blocking the air supply vent and opening the exhaust valve 2 When the exhaust valve opens the compressed air in the head valve chamber is discharged into the atmosphere through the air passage 3 When the air pressure on the bottom surface of the Head Valve 10 overcomes the strength of the Head Valve Spring 8 the Head Valve 10 is pushed upward At this time the Head Valve 10 seals with the Exhaust Valve Rubber 7 blocking the passage to the exhaust vent 4
4. 61 then the Nose 30 Pushing Lever Pushing Lever B Adjuster A TE Spring C 35 Steel 03 97 36 Push Lever A 97 Washer 38 B 33 and others can be removed Hee sb push Lever Stopper 71 Bolt M6 x 12 39 Fig 17 Disassembly and reassembly of the drivng section Nail Feeder B 72 Pushing Lever B 33 Fig 18 b Reassembly Disassembly procedures should be followed in the reverse order Note the following points e Apply designated grease to the O ring 1AS 60 26 and then install it e Check that Nail Feeder B 72 moves smoothly Check that the Pushing Lever Stopper 71 is placed over Pushing Lever B 33 when Nail Feeder B 72 is at the front end See Fig 18 24 10 5 Disassembly and Reassembly of the Cap and the Magazine Section 1 Disassembly and reassembly of the cap See Fig 19 Tool required Hex bar wrench 4 mm Hex Socket Hd Bolt M5 x 16 43 Cap 42 Dust Filter 41 Gasket B 40 Fig 19 Disassembly and reassembly of the cap a Disassembly e Remove the three Hex Socket Hd Bolts M5 x 16 43 with the hex bar wrench so that the Cap 42 dust Filter 41 and Gasket B 40 can be removed b Reassembly e Disassembly procedures should be followed in the reverse order 2 Magazine 76 Nail Feeder B 72 and the related parts See Fig 20 Tool required e Hexagon bar
5. Disassembly Tope eve e Remove the four Hex Socket Hd Bolt W Flange Hex Socket Hd Bolt amp M6 x 35 4 with a hex bar wrench The entire Exhaust eu Cover 5 can now be removed from the Body 22 e Remove the Hex Socket Hd Bolt M6 x 16 1 with a hex Exhaust Cover 5 bar wrench The Plate 2 and the Top Cover 3 can now be removed e As shown in Fig 9B insert 4 to 5 mm dia bar into the hole of M6 screw in the Exhaust Cover 5 and force out the Exhaust Valve Rubber 7 with a hammer Now the Exhaust Valve Rubber 7 parts forming the Exhaust Valve Rubber 7 can be taken out CAUTION Cylinder O ring B 9 D To prevent damage to the Exhaust Valve Rubber 7 do not use a pointed bar or a bar wth a diameter of less than Head Valve 10 4 mm Cylinder O ring m D Hammer T Head Valve Rubber 1 a 2 Exhaust Cover 5 Exhaust Valve Rubber 7 Bar of 4 to 5 mm dia 2 2277571 7 Z 4 A TR E a Body 22 71 we RE L BLN Fig 9A Disassembly and reassembly of the Fig 9B exhaust cover head valve exhaust valve rubber etc 10 Exhaust Cover 5 b Reassembly Exhaust Valve Head Valve 10 Disassembly procedures should be followed in the Rubber 7 reverse order Note the following points e Charge the sliding portion of the Head Valve 10 of the Exhaust Cover 5 with about 3 grams of VW TERMIN SIDE 2 grease and apply grease to each s
6. Fig 2 Required nailing energy and nailer output energy 5 4 Optional Accessories Sequential fire parts set The Sequential Fire Parts Set is provided as an optional accessory for the Model NR 90AC2 By using this optional accessory a nail is driven by pressing the push lever first against a workpiece and then pulling the trigger and no nail is driven when pulling the trigger first and then pressing the push lever against a workpiece single shot operation Please recommend the sequential fire parts set to the customers who want to use it Salespersons must instruct the customers to read the Handling Instructions attached to the sequential fire parts set and also the Handling Instructions of the Model NR 90AC2 thoroughly for correct use 6 COMPARISONS WITH SIMILAR PRODUCTS Maker HITACHI Model NR90AC2 NR 90AC 5 8 5 kgf cm 5 8 5 kgf cm 5 8 5 kgf cm 5 6 8 5 kgf cm Operating pressure 70 120 psi 70 120 psi 70 120 psi 80 120 psi Weight 4 0 kg 8 9 Ibs 4 3 kg 9 5 lbs 3 7 kg 8 2 lbs 3 9 kg 8 6 lbs Dimensions 503 x 353 x 121 mm 548 x 353 x 121 mm 501 x 343 x 111 mm 569 x 332 x 130 mm Lx Hx W 19 13 16 x 13 7 8 x 4 3 4 21 9 16 x 13 7 8 x 4 3 4 19 3 4 x 13 5 8 x 4 3 8 22 13 32 x 13 1 16 x 5 1 8 Air consumption at 2 7 Itr cycle 2 7 Itr cycle 2 3 Itr cycle 2 4 ltr cycle 7 kgf cm 100 psi 095 ft cycle 095 ft cycle 081 ft cycle 085 ft cycle Nail capacity i
7. Rear loading Top loading Rear loading Top loading iocis Lad Aluminum Plastic Aluminum Aluminum Tool not required Tool not required With wrench With wrench do Tool not required Tool not required With wrench With wrench Handle grip AGO 2 9 4 1 mm 2 9 4 1 mm 2 9 4 1 mm 2 9 4 1 mm Applicable 0 113 0 162 0 113 0 162 0 113 0 162 0 113 0 162 nails 60 90mm 60 90mm 60 90 mm 50 90 mm 2 3 8 3 1 2 2 3 8 3 1 2 2 3 8 3 1 2 2 3 1 2 Note The Model NR 90AC2 is equipped with a pushing Pushing Lever Stopper 72 lever stopper as an idling protector The Pushing Lever Stopper 72 is placed over Pushing Lever B 33 to prevent Pushing Lever B 33 from being pushed up when no nail is loaded in the magazine or the number of nails remained in the magazine is five or less depending on the types of nails See Fig 3 Fig 3 7 PRECAUTIONS IN SALES PROMOTION In the interest of promoting the safest and most efficient use of the Model NR 90AC2 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 NR 90AC2 Nailer is designed for continuous nail driving however some of the Model NR 90AC2 are designed for single shot
8. ardor Ye e ew A AE QUA te READ AND UNDERSTAND INSTRUCTION AND SAFETY MANUAL before use Failure to follow instructions WILL RESULT IN SERIOUS INJURY OR DEATH eOperator and others in work area MUST WEAR ANSI REQUIRED 7787 17 EYE PROTECTOR WITH SIDE SHIELDS eNEVER USE BOTTLED GASES Use regulated air B eDO NOT EXCEED e NEVER CARRY WITH FINGER ON TRIGGER e DISCONNECT AIR before servicing unjamming or when not in use The following label is adhered to the Model NR 90AC2 for Europe to prohibit the use of the Model NR 90AC2 standing on a stepladder Carefully ensure that customers fully understand and follow the precaution before using the tool 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 are 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 p
9. fully fed into the injection port e Unspecified nails are used Driver blade is worn Workpiece is very hard 3 Head of a nail driven into a workpiece protrudes e Adjuster is improperly adjusted e Air pressure is too low from the wood Workpiece is very hard surface e Driver blade is worn Piston ring is abnormal worn or damaged e Cylinder s internal surface is abnormal worn or rough Check if the adjuster is raised too high e See item 1 e Check if the driver blade tip is abnormally worn e Drive a nail into soft wood workpiece and check if the nail is bent Turn the adjuster to the lowest position and drive a nail Drive a nail into soft wood workpiece and check if the head protrudes from the wood surface Operate the nailer without nails and check if the driver blade is projected from the nose tip Disassemble the output section and check the piston ring O ring and the inner outer surfaces of the cylinder for abnormal condition m e Turn the adjuster to the lower position to decrease the pressure e See item 1 e Replace the driver blade e Do not use unspecified workpieces e Adjust the adjuster to the proper position e Adjust for 5 to 8 5 kgf cm e Do not use unspecified workpieces e Replace the drive blade e Replace the defective part 9 2 Possible Causes and Corrections of Air Leakage Air leakage repair location e Repa
10. operation only for some destinations At time of sale the salesperson must inform the customer that the sequential trip mechanism kit which can change the Model NR 90AC2 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 use 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 NR 90AC2 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 E B E s EU 2 alicia putt 2 CRE DUE LE PORT RS ta LA ect is 1007794 z mt far a E ES 2 FOR E afe
11. taken out except Valve Bushing A 60 and the Head Valve O Ring 1 0 16 8 50 Valve Piston B 54 Wh i Valve Bushing A 60 disassembling do py gripping it Be careful not to damage Valve Piston B with the pliers 54 Valve Bushing A 60 and B 51 Fig 14 is e Do not pull out the end of Plunger A 58 with the pliers Valve Bushing B 51 3 To take out Valve Bushing B 51 put a 1 5 to 3 mm 0 059 to 0 118 dia wire with its end hooked into the hole in the bushing and pull it out while being careful not to damage the Be careful not to damage internal surface of Valve Bushing B 51 as the internal surface shown in Fig 15 Wire with 1 5 mm to 3 mm 0 059 to 0 118 dia Fig 15 b Reassembly Disassembly procedures should be followed in the reverse order Note the following points e Be extremely careful to prevent the entry of foreign particles into the control valve section Thoroughly apply grease to the O Ring I D 1 8 59 of Plunger A 58 the O Rings 5 4 1 0 8 8 and 1 0 11 53 55 and 56 of Valve Piston B 54 and the shaft of Plunger A 58 shown in Fig 15 e As shown in Fig 15 install Valve Bushing A 60 so that the roll pin groove in Valve Bushing A 60 will be aligned with the roll pin hole in the Body 22 First insert the roll pin puller 3 mm dia into the roll pin hole Then upon confirming that the puller passes throu
12. vent Exhatisr Valve Fey ea x Control valve Control valve section 5 Rubber 7 FEM Dust Filter 41 Head Valve 10 Body 22 Em 4 Rubber A 42 Cylinder 17 SE Piston 19 Piston Bumper A 24 Piston Bumper B 25 Pushing Lever B 6 33 P Adjuster A 34 O 5 Pushing Lever C 37 Magazine section Nose 30 Fig 4 Construction c 8 2 Interchangeability The magazine section is not interchangeable between the Model NR 90AC2 and the NR 90AC because this section of the Model NR 90AC2 have been newly designed The output section the driving section and the control valve section are interchangeable except the following parts Cylinder O Ring B 9 Material Fluororubber Material Nitrile rubber The size is the same as the Model NR 90AC Cylinder O Ring 11 Material Fluororubber Material Nitrile rubber The size is the same as the Model NR 90AC O Ring 18 Piston 19 dp M SA K The grooves made to the O ring are different from the Model NR 90AC O Ring Piston ring Body 22 n Gasket B 40 Dust filter is provided and the shape of gasket is Dust Filter 41 different from the Model NR 90AC Part NR 90AC2 NR 90AC Nose 30 90AC2 8 mm 0 315 NR 90AC 12 mm 0 472 NR 90AC2 7 mm 0 276 NR 90AC 4 5 mm 0 177 Spring 32 Pushing Lever B 33 Idling protector Guard
13. 0 59 6 W2 4 16 881 972 O RING 17 881 939 CYLINDER 18 877 368 O RING 1AP 48 19 883 680 PISTON 20 955 479 RETAINING RING E TYPE FOR D6 SHAFT 878 184 WARNING LABEL 883 675 BODY NAME PLATE 883 670 PISTON BUMPER A 883 671 PISTON BUMPER B 26 956 996 O RING 1AS 60 27 881 969 NYLOCK BOLT W FLANGE M6X20 28 881 935 GUARD 29 883 674 COLLAR B 30 883 672 949 864 NOSE ROLL PIN D3X22 10 PCS 883 691 SPRING 883 673 PUSHING LEVER B 881 974 ADJUSTER A 982 454 SPRING C 36 959 155 STEEL BALL D3 97 10 PCS 37 881 933 PUSHING LEVER A 38 880 081 WASHER 39 949 657 HEX SOCKET HD BOLT M6X12 10 PCS 40 883 678 GASKET B 41 883 679 DUST FILTER 42 881 949 CAP 43 949 821 HEX SOCKET HD BOLT M5X16 10 PCS 44 872 035 DUST CAP 45 949 864 ROLL PIN D3X22 10 PCS 46 880 674 TRIGGER A 47 881 952 TRIGGER PIN 48 949 865 ROLL PIN D3X28 10 PCS 49 880 361 PUSHING LEVER GUIDE 50 877 699 HEAD VALVE O RING I D 16 8 I N I 878 881 VALVE BUSHING B ALTERNATIVE PARTS PARTS EE ET ES 878 885 NR 90AC2 O RING 5 18 981 317 O RING S 4 880 672 VALVE PISTON B 878 925 O RING I D 8 8 878 887 O RING I D 11 57
14. 8 e e 11 INSPECTION AND CONFIRMATION AFTER REASSEMBLY Check that the Pushing Lever Stopper 71 is not placed over Pushing Lever B 33 without loading nails See Fig 21 Pushing Lever Stopper 71 Pushing Lever B 33 Pushing lever ass y Pushing Lever A 37 Fig 21 Note The Model NR 90AC2 is equipped with a pushing lever stopper as an idling protector The Pushing Lever Stopper 71 is placed over Pushing Lever B 33 to prevent the pushing lever ass y from being pushed up when no nail is loaded in the magazine or the number of nails remained in the magazine is five or less Pull Nail Feeder B 72 backward before checking the operation of the pushing lever ass y A Pushing Lever B 33 ee M Pushing lever ass y Pushing Lever A 37 amp amp Nail Feeder B Fig 22 Check that Nail Feeder B 72 slides in the Magazine 76 smoothly e Check that Plunger A 58 moves smoothly e Check that there is no air leakage from each part e While driving nails with an air pressure of 4 5 kgf cm 63 psi check that there is no misfiring and bending of nails Note Before conducting the driving test turn Adjuster A 34 to the deepest position e Recheck the tightening torque of each screw e Check that Pushing Lever A 37 slides smoothly e Check that the machine will not operate only by pulling Trigger A 46 Also check that the machine wil
15. MODEL NR 90AC2 HITACHI POWER TOOLS TECHNICAL DATA SERVICE MANUAL STRIP NAILER NR 90AC2 Sep 2001 LIST No E002 OH IMPROVEMEN SPECIFICATIONS AND PARTS AR 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 CONTENTS Page m 1 2 MAHKETING OBJECTIVE u u uuu u u uuu uu uuu uuu u den eue eue uses 1 APPLICATIONS a aan nas aa caen a nn 1 SELLING POINTES 1 9 SPECIFICATIONS et lie 2 Oo Pa 9159 lee p TT 2 De i GECO TET X 3 oM IURI uet EO ERO 3 5 4 Optional Accessories aai one ren usui uit cts es 4 6 COMPARISONS WITH SIMILAR PRODUCITS J J 5 7 PRECAUTIONS IN SALES PROMOTION U aaa T T T 6 Z MASUUCHON uuu ull l u uluya 6 EM W I iO a ee ll se er 6 7 3 Related Laws and Regulations
16. When the Head Valve 10 goes up the compressed air in the accumulator flows rapidly into the Cylinder 17 forcing the Piston 19 downward to strike the nail When the Piston 19 passes the cylinder hole the compressed air flows into the return air chamber and is accumulated there re Pushing Lever A 37 Exhaust Valve Rubber 7 Exhaust vent Head valve chamber D Air passage Head Valve Spring 8 Head Valve 10 Control Accumulator valve section Piston 1917 i Cylinder hole Cylinder 17 SR Trigger A 46 T Return air chamber ipe ja LIA p bz Nail To the head valve chamber Air supply vent Accumulator Air passage Valve Piston B 54 Plunger A 58 Exhaust valve Valve piston lower chamber lt Fig 6 Control valve section 3 During return See Fig 7 and Fig 8 1 When either Pushing Lever A 37 or Trigger A 46 is released Plunger A 58 goes down and the compressed air in the accumulator flows into the valve piston lower chamber 2 As the air pressure in the valve piston lower chamber increases to overcome the air pressure applied on the upper portion of Valve Piston B 54 Valve Piston B 54 is forced upward When this occurs the exhaust valve is closed and the air supply vent is opened 3 When the air supply vent opens the compress
17. ed air in the accumulator x portion passes through the air passage and flows into the head valve chamber to push down the Head Valve 10 As a result the Head Valve 10 and the Cylinder 17 are sealed and at the same time the Head Valve 10 and the Exhaust Valve Rubber 7 separate to open the exhaust vent 4 The compressed air above the Piston 19 is discharged into the atmosphere through the exhaust vent In this way the air pressure above the Piston 19 is reduced and the greater pressure of the air accumulated in the return air chamber pushes the Piston 19 upward 5 If the air pressure below the Piston 19 is higher than that of the atmosphere after the Piston 19 has fully returned the excess air pressure is discharged into the atmosphere through the clearance between Piston Bumper B 25 and the driver blade Exhaust Valve Rubber 7 Exhaust vent Head valve chamber Ai Head Valve 10 Ti 7 Ir passage ale Control i valve Cylinder 17 eor Return air chamber Piston 19 Piston Bumper A 24 B 25 Driver blade Pushing Lever A 37 To the head valve chamber Air supply vent Accumulator Air passage Exhaust ARRE 8 ES C valve Valve Piston B 54 Valve piston Plunger A 58 lower chamber Fig 8 Control valve section 12 9 TROUBLESHOOTING GUIDE 9 1 Troubleshooting and Correction Nails cannot Nails be driven e Magaz
18. eeds the intersecting point between the nailer output energy and the required nailing energy required for driving the nail allows the nail to be fully driven For example when driving a nail of 4 1 mm dia by 90 mm length 0 162 x 3 1 2 into a workpiece of hemlock spruce with he Model NR 90AC2 a pressure of about 6 4 bar 6 5 kgf cm 92 psi allows the nailer to drive the nail flush to 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 data because those values vary depending on the type moisture content and grain of wood Required nailing energy Nailer output energy ft Ib gl cm tJj t Ib kgf cm J 180 EE TBO C DL ER 1800 3 x 1800 120 JO aie le 1600 1600 x NR 90AC NR90AC2 te e debout tee NG See E ET 1400 1400 I i i 100 2 400 120p Mme pe eM 1500 80 80 m ee bee BU eese oeste S oce ee 60 Op aoe seer eases uoce etu dung 400 mm 4 5 G 7 B bar 0 6 n2 4 5 6 7 8 lt 60 70 BO 90 100 110 120 c PSi t Air pressure setting to drive nail flush with 90AC2 93 mmxmm d 4 1 mmx90 mm 0 162X3 1 2 x co X eo 2 Oo X E E co
19. el NR 90AC2 strip nailer is an upgraded version of the current Model NR 90AC equipped with the demands for improvement but remained its powerful driving force capable of driving round head nails We are confident that your sales will increase with the new Model NR 90AC2 Primary improvements made to the Model NR 90AC2 are described below 1 The magazine section is simplified The material of the magazine is changed from nylon constructed of two parts to extruded aluminum in order to increase the strength and to reduce parts count NR 90AC 27 parts NR 90AC2 20 parts 2 A dust filter is added to the air inlet to prevent dust from getting in the machine 3 The grip tape is changed to the long life grip rubber 2 3 4 The piston ring is changed to the O ring 5 The material of the O ring used in the head valve section is changed to swell resistant material 6 6 The shape of the pushing lever spring is changed to prevent settling 3 APPLICATIONS e Floor and wall framing e Truss build up window build up e Subflooring and roof decking Wall sheathing e Mobile home and modular housing construction 4 SELLING POINTS Equipped with a Simple and high strength aluminum magazine ushing lever stopper p g Pp NR 90AC nylon magazinne idling protector 5 SPECIFICATIONS 5 1 Specifications CCS CN 5 8 5 kgf cm 70 120 psi 4 9 8 3 bar Gauge pressure 503 mm x 353 mm x 121 mm Len
20. f Valve Piston The upper O ring 1 0 8 8 55 of Valve 54 is abnormal worn broken or flawed Piston B 54 is abnormal worn broken or The lower O ring I D 8 8 55 of Valve flawed Piston B 54 is abnormal worn broken on The Head Valve O ring I D 16 8 50 of flawed Valve Bushing B 51 is abnormal broken The O ring 5 18 52 of Valve Bushing B or flawed 51 is abnormal broken or flawed X The upper surface f of the valve cavity of X The internal surface of the valve cavity the Body 22 is abnormal of the Body 22 is abnormal F Control 2 The O ring I D 1 8 59 of Plunger The O ring S 4 53 of Valve Piston B 58 is abnormal worn broken or flawed 54 is abnormal worn broken or flowed Valve Bushing A 60 is abnormal sliding Valve Piston B 54 is abnormal sliding surface of Plunger A 58 is deformed or surface of Plunger A 58 is deformed or flawed flawed Gasket B 40 is damaged e he Hex Socket Hd Bolt M5 x 16 43 is loose Seal surface of the Body 22 or the Cap 42 is abnormal damaged deformed or flawed s r s 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 Before disassemb
21. gh the hole drive in the Roll Pin D3 x 22 45 If an attempt is made to drive the roll pin with force when the roll pin groove in Valve Bushing A 60 is not aligned with the roll pin hole in the Body 22 it will damage the periphery of Valve Bushing A 60 and prevent disassembly or reassembly Body 22 Coat the O ring groove s shaft with grease bas Q Roll Pin D3 x 22 45 Roll pin hole Plunger A 58 Valve Bushing A 60 Apply grease to the stem pom HL ie Roll pin groove Valve Bushing A 60 Fig 16 After assembly make sure that Plunger A 58 moves smoothly 04 10 4 Disassembly and Reassembly of the Driving Section See Fig 16 Roll Pin D3 x 28 48 Nylock Bolt 2 1 T W Flange Md lt M6 x 20 27 i A Arm 64 Piston Bumper A 24 Pushing Piston Bumper B 25 oe 49 uide O Ring 1AS 60 26 Guard 28 Nylock Bolt W Flange M6 x 20 27 ul a q Magazine section e 4 4 Collar 29 A x Tools required Nose 30 e Hex bar wrench 5 mm and 6 mm Body 22 e Roll pin puller 3 mm dia a Disassembly Spring NS I e Remove the Nylock Bolt W Flange M6 x 20 27 4 and take out the magazine section e Remove the Nylock Bolt W Flange M6 x 20 27 and take out the Guard 28 e Pull out the Roll Pin D3 x 28 48 and the Roll Pin D3 x 22 81 Remove the Hex Socket Hd Bolt M8 x 30
22. gth x Height x Width 19 13 16 x 13 7 8 x 4 3 4 Nail feed system 2 7 Itr cycle at 7 oos 0 095 ft cycle at 100 psi 2 7 Itr cycle at 6 9 bar Package dimensions 58 mm x 398 mm x 136 mm Length x Height x Width 23 1 8 x 15 21 32 x 5 11 32 Nose cap Code No 881968 Standard accessories Hex bar wrench for M5 screw Code No 944458 e Hex bar wrench for M6 screw Code No 944459 e Hex bar wrench for M8 screw Code No 872422 e Eye protector Code No 875769 Sequential fire parts set Code No 881973 Pneumatic tool lubricant 1 oz oil feeder Code No 877153 Pneumatic tool lubricant 4 oz oil feeder Code No 874042 Pneumatic tool lubricant 1 quart can Code No 876212 Grease ATTOLUB No 2 500 g 1 1 lbs Code No 317918 Case Code No 878898 Optional accessories 5 2 Nail Selection The Model NR 90AC2 utilizes round head nails collated with plastic resin into bands of 25 to 30 pieces Applicable nail dimensions are shown below CAUTION Ensure that nails are as specified in Fig 1 Other nails will cause clogging of nails and subsequent damage to the nailer Plastic collated strip nails full head nails D e cO mI 7 7 in 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 exc
23. ine is not loaded with Check if the magazine is Use specified nails specified genuine nails normally loaded with e Remove the abnormal nails specified nails and load the magazine with e Magazine is loaded with normal nails abnormal nails bent nails large or small round head nails abnormal collation etc Nail or collating band clogs e Collating band is deformed or torn Magazine Magazine is abnormal e Check if the nail feeder Repair or replace the deformed or damaged operates smoothly in the defective part magazine e Nail feeder is abnormal e Check if nails one strip deformed or damaged move smoothly in the mE magazine e Ribbon spring is abnormal deformed or damaged e Nail rail is abnormal deformed burrs damaged or fatigued e Adhesive fragments are on Remove the adhesive the nail rail or they need oil fragments and apply oil to the nail feeder ribbon spring e Foreign matter is found on and the nail rail the guide face of the nail feeder Nose Nail inlet groove of the nose Check if nails one strip are Repair or replace the is abnormal deformed fed smoothly into the nail defective part burrs or damaged injection port of the nose Adhesive fragments are in e Remove the adhesive the nail inlet groove fragments lt Output section gt Air pressure is too low e Pull the nail feeder e Adjust for 5 to 8 5 kgf cm backward and perfo
24. ir procedure 1 Check the points of the following parts marked by an asterisk for abnormal condition 2 Next check the seal parts marked with a double circle for wear flaw and damage 3 And then check other places Control valve section Possible cause Air leakage point With control valve OFF With control valve ON Cylinder O ring B 9 of the Head Valve The Exhaust Valve Rubber 7 is abnormal 10 is abnormal or its sliding surface a is or the sliding surface c of the Head Valve worn deformed or flawed 10 is worn or flawed The Head Valve Rubber 12 is abnormal or the sealing surface b of the Cylinder 17 is worn or flawed e The Hex Socket Hd Bolt W Flange B Exhaust cover M6 x 35 4 is loose Gasket A 6 is damaged e Seal surface of the Body 22 or the Exhaust Cover 5 is abnormal Air leakage point With control valve OFF With control valve ON The Cylinder O ring 26 of the Body 22 or the groove is abnormal broken or flawed e The Hex Socket Hd Bolt M8 x 30 61 is loose The O ring S 95 14 of the Cylinder Plate Piston Bumper 24 is abnormal 13 or the O ring I D 59 6 W2 4 15 of portion d is damaged deformed or the Cylinder 17 is abnormal broken or cracked flawed e The Piston 19 is abnormal driver blade is deformed or seal surface is deformed E Control Valve 1 The O ring I D 11 56 o
25. l not operate only by depressing Pushing Lever A 37 28 12 con eue REPAIR TIME UNIT SCHEDULES NR 90AC2 Top Cover Exhaust Cover Gasket A Exhaust Valve Nose Rubber Magazine Head Valve Cover Spring Magazine Cylinder Nail Feeder A O ring B Spri Head Valve Mn Co Nail Feeder B LES eng Ribbon Spring Head Valve Rubber BE Pushing Lever Cylinder Plate Body Ass y B Cylinder Spring O ring x 4 Adjuster A Piston Bumper Pushing Lever A A Piston Bumper Spring C B Piston O ring Pushing Lever Guide Trigger A Trigger Pin Valve Bushing B O ring x 7 Valve Piston B Plunger Spring Plunger A Valve Bushing A Adjustment Cylinder Body and Valve 29 a LL Z H o ep lt an EM HITACHI PNEUMATIC STRIP NAILER 2001 9 5 H Ys PARTS EE E _ 949 755 HEX SOCKET HD BOLT M6X16 10 PCS 880 515 PLATE 880 514 TOP COVER 882 793 HEX SOCKET HD BOLT W FLANGE M6X35 881 946 EXHAUST COVER 6 881 940 GASKET A 7 881 945 EXHAUST VALVE RUBBER 8 881 944 HEAD VALVE SPRING 9 883 676 CYLINDER O RING B 10 881 942 HEAD VALVE 883 677 CYLINDER O RING 881 943 HEAD VALVE RUBBER 881 941 CYLINDER PLATE 878 907 O RING S 95 878 376 O RING 1
26. ly 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 Apply grease ATTOLUB No 2 Code No 317918 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 Oil required Hitachi pneumatic tool lubricant 1 oz 30 cc oil feeder Code No 877153 4 oz 120 cc oil feeder Code No 874042 1 quart 1 Itr can Code No 876212 e f Gasket A 6 is damaged replace it and check that no air is leaking e Be especially careful to prevent the entry of foreign particles into the control valve section e Tightening torque for each part Hex Socket Hd Bolt M8 x 30 Hex Socket Hd Bolt M6 x 16 Hex Socket Hd Bolt M6 x 12 Hex Socket Hd Bolt W Flange M6 x 35 12 7 0 8 130 8 9 4 0 6 Nylock Bolt W Flange M6 x 20 12 7 0 8 130 8 9 4 0 6 Hex Socket Hd Bolt W Flange M6 x 12 9 8 0 8 100 8 7 2 0 6 Hex Socket Hd Bolt M5 x 16 6 4 0 5 65 5 4 7 0 4 18 10 2 Disassembly and Reassembly of the Output Section 1 Disassembly and reassembly of the Exhaust Cover 5 Head Valve 10 Exhaust Valve Rubber 7 etc See Fig 9A and Fig 9B Tools required e Hex bar wrench 5 mm Hex Socket Hd Bolt M6 x 16 1 e Hammer Plate 2 a
27. over 67 Nail Stopper Nylock Bolt W Flange Es 78 Socket Hd Bolt W Flange M6 x 20 27 Ty Handle Arm 64 j Re M6 x 12 77 57 gt E Hex Socket Hd Bolt Nail Rail 63 LS A 63 Z i Magazine 76 Roll Pin D4 x 40 69 Nail Feeder A 68 p de D EN Jon Needle Roller D4 x 20 75 Spring 70 fle Ribbon Spring 74 Re a Pushing Lever Stopper 71 Roll Pin D3 x 10 73 Nail Feeder B 72 Fig 20 96 3 Nail Feeders A 68 B 72 and the related parts Tool required e Roll pin puller 3 mm 0 118 4 mm 0 157 dia a Disassembly e Fix Nail Feeder B 72 using a V block and pull out the Roll Pin D4 x 40 69 from the top using a roll pin puller 4 mm 0 157 dia Then Nail Feeder A 68 Nail Feeder B 72 and Spring 70 can be removed Pull out the Roll Pin D3 x 10 73 with the roll pin puller 3 mm 0 118 Then the Pushing Lever Stopper 71 can be removed from Nail Feeder B 72 b Reassembly Disassembly procedures should be followed in the reverse order Note the following points e Insert the Pushing Lever Stopper 71 in Nail Feeder B 72 and secure with the Roll Pin D3 x 10 73 e Insert the Roll Pin D4 x 40 69 into Nail Feeder B 72 Insert the Spring 70 into the hole of Nail Feeder B 72 and compress the Spring 70 until it is engaged with the protrusion of Nail Feeder A 6
28. r 3 mm dia for D6 Shaft 20 Trigger Pin 47 x Head Valve O Ring 1 0 16 8 50 a Disassembly Valve Bushing 51 e Remove the Retaining Ring E type for O Ring 5 18 52 D6 Shaft 20 with a flat blade screwdriver 5 O Ring S 4 53 and pull out the Trigger Pin 47 then Valve Piston B 54 Trigger A 46 can be removed a uid uD 9 0 59 To remove Trigger A 46 together with O Ring I D 11 56 RM al Plunger Spring 57 the driving section Pushing Lever B E 33 Nose 30 etc remove Trigger A 46 while forcing PI A 58 O Ring I D 1 8 59 46 while forcing down Plunger A 58 8 with the blade of a flat blade screwdriver Valve Bushing A 60 e as shown n Fig 12 Fig 12 Disassembly and reassembly of the control valve section Remove Pushing Lever B 33 Trigger A 46 IT Flat blade screwdriver Fig 13 to Pull out the Roll Pin D3 x 22 45 with the roll Push pin puller 3 mm dia and take out the y control valve in the following manner 7 to 0 197 dia 1 Remove the Exhaust Cover 5 by following Body 22 the procedure in 1 item 10 2 2 As shown in Fig 14 put the 4 to 5 0 157 to 0 197 dia bar from the upper side 72777771 Head Valve O Ring I D 16 8 50 of the Body 22 and push the top of Valve Piston B 54 Now the parts forming the control valve can be
29. rm idle e Replace the piston ring Piston O ring is worn or driving Check if the driver damaged blade has returned e Piston bumper is abnormal e Replace the piston bumper dislocated deformed or damaged e O ring of the cylinder is Reassemble or replace abnormal dislocated deformed or damaged e Driver blade is abnormal e Repair or replace deformed burrs damaged or fatigued e Cylinder s internal surface is e Check if nails can be driven e Remove the dirt and apply abnormal deposits of dirt or at 5 kgf cm oil or replace worn e Replace the defective part e Head valve sliding surface 15 While operating the nailer e Apply grease abnormal galled damaged without nails check if the or needs oil drivng operation is performed e Head valve spring is After operating the nailer e Replace the head valve abnormal fatigued or without nails check if the spring damaged driver blade is kept in the down position lt Control valve section gt e Plunger A valve piston B e After making idle driving Replace the defective part valve bushing A or valve check if the driver blade is bushing B is abnormal kept in the down position galled or damaged e O ring is worn or oiling is e Disassemble the control Apply grease or replace needed valve and check the O ring 2 Nails are bent For short nails the adjuster when being is raised too high driven e Nails are not
30. rotection 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 4 the Model NR 90AC2 can be generally divided into four sections output section control valve section driving section and magazine section The magazine section has been newly designed though its basic construction is the same as that of the Model NR 90AC Features of the main parts are described below e Output section Most parts are common to the Model NR 90AC except the following parts CD The dust filter is added to the cap Owing to this addition gasket B is changed 2 The piston ring is changed to the O ring 3 The O ring used in the head valve section is changed to swell resistant type 4 The rubber handle grip is adopted at the body ass y Control valve section The valve construction is similar to the Model NR 90AC e Driving section The nose and pushing lever B have been newly designed e Magazine section All the parts have been newly designed The rear loading type magazine is made of aluminum and equipped with an idling protector Valve Piston B 54 taco Plunger Spring 57 cx Plunger A 58 Exhaust Cover 5 JF 4 15 Jes 2 9 O Ring Bi __ Valve Bushing 60 Exhaust
31. urface of the O rings e As shown in Fig 10 firmly push the Exhaust Valve Rubber 7 until it is fully seated over the E We Charge with grease of 3 grams projection of the Exhaust Cover 5 Push until the rubber is fully seated over the projection Fig 10 2 Disassembly and reassembly of the Cylinder 17 Piston 19 Piston Bumper A B 24 25 etc See Fig 11 a Disassembly Remove the Exhaust Cover 5 as described in item 1 Now the Cylinder 17 Cylinder Plate 13 Piston 19 Piston Bumper A B 24 25 etc can be taken out b Reassembly Disassembly procedures should be followed in the reverse order Note the following points Apply designated grease to the O ring 1AP 48 18 and the internal side of the Cylinder 177 e Apply designated grease to the O ring S 95 14 O ring 1 0 59 6 W2 4 15 and the O ring 16 and then install them Cylinder Plate 13 Os O ring O ring S 95 14 1AP 48 5 gt D O ring I D 59 6 W2 4 15 lt 18 O ring 16 lt 2 Piston im Ca 19 Cylinder 17 Piston Bumper A 24 2 Piston Bumper B 25 Body 221 1 Fig 11 Disassembly reassembly of the cylinder piston piston bumper etc zs 10 3 Disassembly and Reassembly of the Control Valve Section See Fig 12 Tools required e Slotted head screwdriver Retaining Ring E type e Roll pin pulle
32. wrench 5 mm a Disassembly Perform disassembly according to 10 4 to remove the entire magazine section e The Connector 62 Nail Rail 63 Nail Feeder B 72 Ribbon Spring 74 and Needle Roller D4 x 20 75 can be removed from the front of the Magazine 76 e Remove the three Hex Socket Hd Bolts W Flange M6 x 12 77 Then Handle Arm 64 Nail Stopper 78 and Magazine Cover 67 can be removed together with the other parts e The Nail Rail 63 that is press fitted into the Magazine 76 has a protrusion at the rear end to prevent coming off Tap at the front of the Magazine 76 using a hammer and a bar being careful not to scratch the parts gt b Reassembly Disassembly procedures should be followed in the reverse order Note the following points O Insert the Nail Rail 63 from the rear of the Magazine 76 and press fit the Nail Rail 63 into the Magazine 76 by tapping with a wooden hammer so that the protrusion of the Nail Rail 63 becomes flush with the rear end of the Magazine 76 O Hook the hook of the Ribbon Spring 74 on the Magazine 76 then mount Nail Feeder B 72 to the Magazine 76 O Press the mounting surface of the Nail Stopper 78 against the Magazine 76 and slide it backward until the A portion fits into the concave portion of the Magazine Cover 67 then secure them with the bolt At this time mount the Sleeve 66 without fail Sleeve Nylon Nut M6 65 66 Magazine C

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