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1. Cylinder 15 down to seal the Head Valve 9 and Cylinder 15 B 2 When nailing See Fig 4 and Fig 5 Reima 1 When Pushing Lever A 35 and Trigger 50 are operated together and the Plunger 70 is pushed upward the compressed air in the valve piston lower chamber is discharged from the bottom of the Plunger 70 As a result the Be Nail compressed air the accumulator portion pushes down Valve Piston 66 blocking the air supply vent and opening the exhaust valve HE 2 When the exhaust valve opens the compressed air in the head valve chamber is discharged into To the head valve chamber Air supply vent lat the atmosphere through the air passage ccumulator 3 When the air pressure on the bottom surface of the Head Valve 9 overcomes the strength of the Head Valve Spring 7 the Head Valve 9 is pushed upward At this time the Head Valve 9 Air passage seals with the Exhaust Valve Rubber 11 blocking Exhaust the passage to the exhaust vent valve 4 When the Head Valve 9 goes up the Valve Piston 66 Valve piston lower chamber Plunger 70 compressed air in the accumulator flows rapidly into the Cylinder 15 forcing the Piston 13 Fig 5 Control valve section downward to strike the nail When the Piston 13 passes the cylinder hole the compressed air flows into the return air chamber and is accumulated there eti es
2. Fastener Driving Tools Safety Requirements for 8 MECHANISM AND OPERATION PRINCIPLE 8 1 Mechanism As illustrated in Fig 3 Model NR 90AD can be generally divided into four sections Output section control valve section driving section and magazine section Although the basic construction of the Model NR 90AD is the same as that of the Model NR 90AC3 most of the parts of the above sections have been newly designed for maximum performance in a strip nailer Features of the main parts are described below Output section Most of the parts have been newly designed 1 The body and exhaust cover are made of aluminum to achieve simplification and light weight 2 The head guard made of stainless steel is mounted to the head Control valve section Most of the parts have been newly designed 1 All the parts except the plunger are made of resin to achieve the light weight 2 The entire control valve section is made into a unit type for easy assembly 3 The single actuation single sequential actuation contact actuation mechanisms are the same as that of the Model NR 90AC3 Driving section Most of the parts have been newly designed 1 The basic structure of the depth adjustment mechanism is the same as that of the Model NV 75AG Magazine section Most of the parts have been newly designed 1 The magazine is the same rear loading type as the Model NR 83AA3 It is uniquely
3. INCLUD 79 81 85 6 04 ALTERNATIVE PARTS 3 STANDARD ACCESSORIES NR 90AD de CODE NO DESCRIPTION KA 875 769 SAFETY GLASSES OPTIONAL ACCESSORIES mem me 601 881 768 GRIP TAPE 602 880 407 TAPE 4 ALTERNATIVE PARTS Printed in Japan 6 04 040615N Hitachi Koki Co Ltd Tokyo Japan
4. Check if the magazine is Specified genuine nails normally loaded with 7 specified nails e Magazine is loaded with 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 lt Magazine gt e Magazine is abnormal deformed or damaged e Check if the nail feeder operates smoothly in the 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 the nail rail or they need oil e Foreign matter is found on the guide face of the nail feeder Nose e Nail inlet groove of the nose is abnormal deformed burrs or damaged e Adhesive fragments are in the nail inlet groove Check if nails one strip are fed smoothly into the nail injection port of the nose e Use specified nails e Remove the abnormal nails and load the magazine with normal nails e Repair or replace the defective part Remove the adhesive fragments and apply oil to the nail feeder ribbon spring and the rail Repair or replace the defective part e Remove the adhesive fragments lt Output section gt 2 Nails are bent when being driven e Air pressure is too low e
5. Tools required Flat blade screwdriver Roll pin puller 3 mm 0 118 dia a Disassembly e Remove the Retaining Ring E type for 06 Shaft 22 with blade of a screwdriver and pull out Change Knob C 46 being careful not to lose the Steel Ball D3 97 44 and Spring C 45 Then pull out the Roll Pin x 32 21 with the roll pin puller 3 mm dia remove the Pushing Lever Guide 48 and Trigger 50 can be removed Roll Pin D3 x 25 20 Roll Pin D3 x 32 21 NS N Carefully disassemble so as Retaining Ring E type not to lose these parts for D6 Shaft 22 Cd Feed Piston O Ring 1 0 14 62 amp vave Bushing B 63 O ring P 18 64 O ring P 7 65 Valve Piston 66 3 97 44 pring C 45 amp O ring P 7 65 Se O ring 1AP 10 67 Body Ass y 24 Change Knob C 46 Plunger Spring 68 O ring 1 8 69 Trigger Arm C 47 Plunger 70 O ring I D 1 8 69 Pushing Lever Guide 48 po amp Valve Bushing A 71 Trigger C 50 Fig 15 Disassembly and reassembly of the control valve section zx Valve Piston 66 When disassembling Siap Valve Bushing A 71 do not pull out this part by gripping Plunger 70 it with the pliers Fig 16 Be careful not to damage the internal surface Wire with 1 5 mm to 3 mm 0 059 to 0 118 dia Fig 17 25 Pull the
6. air is leaking e Be especially careful to prevent the entry of foreign particles into the control valve section e Use the conventional grip tape for repair of Grip Rubber A 38 because Grip Rubber A 38 cannot be mounted without the specifically designed jig e Tightening torque for each part Nylock Hex Socket Hd Bolt M8 x 30 Hex Socket Hd Bolt M6 x 22 Hex Socket Hd Bolt W Flange M6 x 30 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 14 8 3 0 5 85 5 6 1 0 4 Hex Socket Hd Bolt M5 x 16 6 4 0 5 65 5 4 7 0 4 20 10 2 Disassembly and Reassembly of the Output Section 1 Disassembly and reassembly of the Exhaust Cover 5 Head Valve 9 Exhaust Valve Rubber 11 etc See Fig 11 and Fig 118 Tools required Hex Socket Hd Bolt MEUSE e Hex bar wrench 4 mm 5 mm M5 x 14 1 M ammer Head Guard 2 Disassembly Remove the four Socket Bolts 5 x 14 1 with a Sheet 3 hex bar wrench The Head Guard 2 and the Sheet 3 Hex Socket Hd Bolt W Flange M6 x 30 4 can now be removed Remove the four Hex Socket Hd Bolt W Flange Exhaust Cover 5 M6 x 30 4 with a hex bar wrench The entire Exhaust Cover 5 can now be removed from the Body Ass y 24 As shown in Fig 11B insert a 4 to 5 mm dia bar into the Head Valve Spring 7 central hole in the Exhaust Cover 5 and force out the
7. MODEL NH 90AD Hitachi Power Tools TECHNICAL DATA STRIP NAILER fera NR 90AD SERVICE MANUAL LIST No E016 Jun 2004 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT Throughout this TECHNICAL DATA AND SERVICE MANUAL symbol s is are used in the place of company name s and model 5 of our competitor s The symbol s utilized here is are as follows Competitors Symbols Utilized Company Name Model Name 0 SENCO FramePro 701XP 5 UM PRODUC FNAME E 1 2 MARKETING OBJECTIVE iii iii 1 LE 1 4 SELLING POINTS ed iis 1 E ere ut LEE 2 OS ee e E 2 9 2 gt 2 EE 3 5 3 Nail Selection i 4 5 4 Nail RI ____________ __ 5 6 COMPARISONS WITH SIMILAR PRODUCTS 6 7 PRECAUTIONS IN SALES PROMOTION rsrirerienesenis zine 7 FA PES Late in Le WINS UMUC ONS PET ETT 7 Warning Eee 7 9 Related Laws and e EE e E 8 8 MECHANISM AND OPERATION PRINCIPLE 9 NIE INE tmm 9 8 2 Operation Principle m a 11 9 TROUBLESHOOTING GUIDE 14 9 1 Troubleshooting and Ol CC UO i ni 14 9 2 Regrinding the Driver BAR aio
8. Pins D3 x 25 20 and D3 x 32 21 with the roll pin puller 3 mm dia and take out the control valve in the following manner 1 Remove the Exhaust Cover 5 by following the procedure in 1 item 10 2 2 As shown in Fig 16 put in the 4 to 5 mm 0 157 to 0 197 dia bar from the upper side of the Body Ass y 24 and push the top of Valve Piston 66 Now the parts forming the control valve can be taken out except Valve Bushing B 63 CAUTION Be careful not to damage the Valve Piston 66 Valve Bushings A 71 and B 63 etc Do not pull out the end of the Plunger 70 with the pliers 3 To take out Valve Bushing B 63 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 internal surface of Valve Bushing B 63 as shown in Fig 17 Reassembly Disassembly procedures should be followed in the reverse order Note the following points Be extremely careful to prevent the entry of foreign particles into the control valve section Thoroughly apply grease to the O Rings I D 1 8 69 of the Plunger 70 the O Rings P 7 65 and 1AP 10 67 of the Valve Piston 66 First align the roll pin groove of Valve Bushing A 71 with that of Valve Bushing 63 and reassemble the entire control valve unit as shown in Fig 18 Then install the control valve unit so that the roll pin groo
9. Exhaust Valve Rubber 11 with a hammer Now the O ring I D 49 4 8 parts forming the Exhaust Valve Rubber 11 can be taken out Head Valve 9 CAUTION O ring 1 0 59 4 1 prevent damage to the Exhaust Valve Rubber 11 do not use a pointed bar or a bar with a diameter of less Exhaust Valve Rubber 11 than 4 mm Hammer Gasket A 6 Exhaust Cover 5 Bar of 4 to 5 mm dia Exhaust Valve Rubber 11 Body Ass y 24 cry 4 AS 9060 H e dt UA X X SE ASS SSS Fig 11 Disassembly and reassembly of the exhaust cover head valve exhaust valve rubber etc Fig 11B he Reassembly Disassembly procedures should be followed in the reverse order Note the following points Charge the sliding portion of the Head Valve 9 of the Exhaust Cover 5 with about 3 grams of grease and apply grease to each surface of the O rings As shown in Fig 12 firmly push the Exhaust Valve Rubber 11 until it is fully seated over the projection of the Exhaust Cover 5 Exhaust Valve Rubber 11 Head Valve 9 Exhaust Cover 5 ema 2 e ov 4 d a L Zeg 70000904 e d f 960 Ger 4 Le 0 0 0 070700000004 0 0606060606000 200 4 e 22 2 0 0 0 4 DX we ww 0
10. Socket Hd Bolt M8 x 30 30 then the Nose 29 Pushing Lever A 35 and others can be removed Nylon Nut 6 74 Handle Arm 73 Hex Socket Hd Bolt 6 x 22 36 Body Ass y 24 Piston Bumper 31 S O ring S 63 32 Roll Pin D3 x 32 21 Washer 27 Pushing Lever Guide 48 Pushing Lever Spring B 51 P Lever Spring A 52 J Pushing Lever C 53 R Adjuster 54 Magazine section Hex Socket Hd Bolt M5 x 14 1 Pushing Lever k Y P e a Roll Pin D2 x 16 55 n 28 P Adjuster Spring 56 Nylock Hex Socket gt i Adjuster Plate C 57 Hd Bolt M8 x 30 30 j 7 Adjuster Plate A 58 Nose 29 M SAX Pushing Lever B 59 SN O ring S 5 60 i Retaining Ring E type Pushing Lever A 35 for D3 Shaft 61 Nylon Nut M5 33 Nose Rubber 34 Fig 19 Disassembly and reassembly of the driving section b Reassembly See Fig 20 Disassembly procedures should be followed in the reverse order Note the following points Apply grease to the O ring S 63 32 and mount it in the groove of the Nose 29 Insert Pushing Lever Springs A 52 and 51 between the protrusion of Pushing Lever 53 and the protrusion of the Pushing Lever Guide 48 Align the bent portion of Adjuster Plate A 58 with the concave portion of the Pushing Lever Guide 48 After reassembly check the components of the pushing lever and the
11. Adjuster 54 move smoothly Pushing Lever C 53 Pushing Lever Spring A 52 Pushing Lever Spring B 51 2 d Protrusions gt 2 K I Adjuster 54 Pushing Lever Guide 48 Align these portions ai 7 Y y Sw Bent portion of Adjuster Plate A 58 Fig 20 Be careful of the mounting direction of the Nose Rubber 34 As shown in Fig 21 mount the two Nose Rubbers 34 so that their convex portions face downward 7 AY lt o VA ZZ D AP Nose 29 Nose Rubbers 34 pp 4 Mount the Nose Rubbers 34 so that these convex portions face downward Nose Rubber 34 Fig 21 28 2 Disassembly and reassembly of the adjuster unit a Disassembly See Fig 22 Remove the Retaining Ring E type for D3 Shaft 61 Then Pushing Lever A 35 and the adjuster unit can be separated Pull out the Roll Pin D2 x 16 55 Then the adjuster unit can be disassembled b Reassembly Disassembly procedures should be followed in the reverse order Note the following points Mount Adjuster Plate A 58 facing its bent portion toward the Adjuster 54 Mount Adjuster Plate 57 facing its convex portion toward Adjuster Plate A 58 Adjuster 54 Adjuster Plate 57 Convex portion Adjuster Spring 56 Bent portion Bent portion Adjuster Plate
12. Feeder Ass y 88 to the Magazine 77 Then insert the Roll Pin 03 x 8 86 Holding the Nylon Nut 6 74 with a wrench 6 mount the magazine section to the Body Ass y 24 with the Hex Socket Hd Bolt 6 x 22 36 Sleeve 75 Magazine Cover 76 Nylon Nut M6 Hold it with wrench M6 when tightening or removing the Hex Socket Hd Bolt M6 x 22 36 Hex Socket Hd Bolt M6 x 22 36 Nylon Nut 6 74 SC Protrusion Handle Arm 73 Nylon Nut 6 74 Nail Rail 84 Hex Socket Hd Bolt W Flange we M6 x 12 78 27 7 Hooking portion Nail Feeder Ass y 88 CN Needle Roller D4 x 20 82 27 Roll Pin 03 x 8 86 Ribbon Spring 83 Hook Fig 23 2 Nail Feeders A 79 B 81 and the related parts See Fig 24 Tool required Roll pin puller 4 mm 0 157 dia a Disassembly Fix the Nail Feeder Ass y 88 using a V block and pull out the Roll Pin D4 x 32 80 from the top using a roll pin puller 4 mm 0 157 dia Then Nail Feeder A 79 Nail Feeder B 81 and Feeder Spring 85 can be removed e Remove Nail Feeder A 79 from Nail Feeder B 81 by twisting Nail Feeder A 79 Se b Reassembly Disassembly procedures should be followed in the reverse order Note the following points When inserting the Roll Pin D4 x 32 80 into Nail Feeder 81 be careful that the end of the Roll Pin D4 x 32 80 is not stick out from Nai
13. Replace nail feeder A e See Output section in item 1 e Replace the part Replace the part e Replace the part e Replace the abnormal part e A switching device is set to the correct position 9 2 Regrinding the Driver Blade The tip of the driver blade should be ground as shown in Fig 10 To grind with a grinder gradually grind the tip while cooling the ground area with water to prevent it from being excessively heated Excessive grinding will rapidly reduce the service life of the driver blade In such a case replace the driver blade Driver blade Concave a Grinding surface Fig 10 So 9 3 Possible Causes and Correction of Air Leakage Air leakage repair location E eni AIA Air leakage point A Exhaust port B Exhaust cover e Repair 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 car qu 3 And then check other places EE G 1 Control valve section Possible cause With control valve OFF With control valve ON The O ring 1 0 49 4 8 of the Head Valve The Exhaust Valve Rubber 11 is abnormal 9 is abnormal or its sliding surface is or the sliding surface of the Head Valve worn deformed or flawed 9 is worn or flawed The Valve Rubber 14 is abnormal or the
14. Single actuation mechanism 70 returns lowers completely as shown in Fig 5 Compressed air then flows into the valve piston lower chamber and the Valve Piston 66 is forced upward The Piston 13 then returns Accumulator fully upward Therefore unless Trigger C 50 possi 4 4 9 9 eebe 4 gt e olo desse ss ses e is released after each nailing operation the structural mechanism prevents the next nailing I ose ees operation MEI Contact actuation mechanism Switching device M e aS Valve Piston 66 eas downward position 1 Immediately after the first nail is driven the a e mo d Trigger C 50 control valve should be as shown in Fig 7 P Xo 2 Even when only Pushing Lever C 53 is SES NY released and Trigger 50 is held the Valve piston lower chamber Plunger 70 returns lowers completely as shown in Fig 9 Thus the Piston 13 returns Pushing Lever C 53 m Switching device Change Knob C 46 raises fully Accordingly continuous nailing Downward postion can be accomplished by pushing only Pushing Fig 9 Contact actuation mechanism Lever C 53 up and down while holding Trigger 50 depressed 3 9 TROUBLESHOOTING GUIDE 9 1 Troubleshooting and Correction Nails cannot be driven lt Nails gt e Magazine is not loaded with
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16. sealing surface b of the Head Valve 9 is worn or flawed The Hex Socket Hd Bolt W Flange 6 x 30 4 is loose Gasket A 6 is damaged Seal surface of the Body Ass y 24 or the Exhaust Cover 5 is abnormal Air leakage point With control valve OFF With control valve ON The O ring S 63 32 of the Nose 29 or the groove is abnormal broken or flawed The Nylock Hex Socket Hd Bolt M8 x 30 30 is loose The O ring I D 94 6 18 of the Cylinder The Piston Bumper 31 is abnormal Plate 17 or the O ring 1 0 59 6 16 of portion d is damaged deformed or the Cylinder 15 is abnormal broken or cracked flawed The Piston 13 is abnormal driver blade is deformed or seal surface is deformed The O ring 1AP 10 67 of the Valve The upper O ring P 7 65 of the Valve Piston 66 is abnormal worn broken or Piston 66 is abnormal worn broken or flawed flawed The lower O ring P 7 65 of the Valve The Feed Piston O ring I D 14 62 of Piston 66 is abnormal worn broken or Valve Bushing B 63 is abnormal broken flawed or flawed The O ring P 18 64 of Valve Bushing B The internal surface of the valve cavity 63 is abnormal broken or flawed of the Body Ass y 24 is abnormal X The internal surface the valve cavity of the Body Ass y 24 is abnormal F Control Valve 2 The lower O ring 1 0 1 8 6
17. tip is abnormally worn e Drive a nail into soft wood workpiece and check if the nail is bent e Check nail feeder A for abnormal condition e Adjust for 5 to 8 5 kgf cm e the piston O ring e Replace the piston bumper Reassemble or replace e Repair or replace e Remove the dirt and apply oil or replace e Replace the defective part e Apply grease Replace the head valve spring Replace the defective part e Apply grease or replace e Turn the adjuster to the lower position to decrease the pressure e See item 1 e Replace the driver blade Do not use unspecified workpieces e Replace nail feeder A 3 Headofa driven into a workpiece protrudes e Adjuster is improperly adjusted e Air pressure is too low from the wood e Workpiece is very hard surface 4 Nails clog the mechanism 5 Single actuation mechanism is not possible e Driver blade is worn Piston O ring is abnormal worn or damaged e Cylinder s internal surface is abnormal worn or rough e Unspecified nails used lt Improper nail feed gt e See Magazine in item 1 e Driver blade worn e Nail feeder A is abnormal worn or damaged lt The driver blade has not returned completely gt e See lt Output section gt in item 1 Ze O ring in plunger is worn Xe O ring in valve piston is worn e Abnormal plunger sliding
18. 00 0 SIRIA d 37 54 AQ Wied P d Apply grease of 3 grams to the sliding potion Push until the rubber is fully seated over the projection Fig 12 Mount the Sheet 3 in the direction as shown in Fig 13 aligning the center of the hole of the Sheet 3 with the center of the bolt hole of the Exhaust Cover 5 If not aligned abnormal exhaust noise may be heard Exhaust Cover 5 Sheet 3 Align the center of the hole of the Sheet 3 with the center of the bolt hole of the Exhaust Cover 5 Fig 13 2 Disassembly and reassembly of the Cylinder 15 Piston 13 Piston Bumper 31 etc See Fig 14 a Disassembly Remove the Exhaust Cover 5 as described in item 1 Now the Cylinder 15 Cylinder Plate 17 Piston 13 Piston Bumper 31 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 Piston O ring 12 and the internal side of the Cylinder 15 e Apply designated grease to the O ring 0 94 6 18 O ring 1 0 59 6 16 and then install them Valve Rubber 14 C9 Cylinder 15 Piston O ring 12 Piston 13 Ass y 24 Fig 14 Disassembly and reassembly of the cylinder piston piston bumper etc 23 10 3 Disassembly and Reassembly of the Control Valve Section See Fig 15
19. 17 9 3 Possible Causes and Correction of Air Leakage i 18 10 DISASSEMBLY AND REASSEMBLY iii 20 10 1 General Precautions in Disassembly and Reassembly 20 10 2 Disassembly and Reassembly of the Output Section Rs 21 10 3 Disassembly and Reassembly of the Control Valve Section 24 10 4 Disassembly and Reassembly of the Driving Section 27 10 5 Disassembly and Reassembly of the Cap and the Magazine Section 30 11 INSPECTION AND CONFIRMATION AFTER REASSEMBLY 33 12 STANDARD REPAIR TIME UNIT SCHEDULES iii 34 Assembly Diagram for 90AD 1 PRODUCT NAME Hitachi 90 mm 3 1 2 Strip Nailer Model NR 90AD 2 MARKETING OBJECTIVE The Model NR 90AD is a framing nailer for clipped head D head nails This is developed as a next generation nailer with an all new design in order to expand our market share The main features of the Model NR 90AD are as follows 1 Lightweight 3 2 kg and good balance 2 Low height 3 Rapid driving and quick response mechanism 4 New aggressive appearance 6 Tool less depth adjustment 5 Selective actuation single actuation contact actuation 7 Comfortable grip 3 APPLICATIONS e Floor and framing Truss build up windo
20. 3 During return See Fig 6 and Fig 7 Exhaust Valve Rubber 11 1 When either Pushing Lever A 35 or Trigger C Exhaust vent Kette 50 is released the Plunger 70 goes down and Head Valve Spring 7 the compressed air in the accumulator flows into Air passage Head Valve 9 the valve piston lower chamber Control Accumulator valve 2 As the air pressure in the valve piston lower section Cylinder 15 gier chamber increases to overcome the air pressure applied on the upper portion of the Valve Piston Benini 66 the Valve Piston 66 is forced upward When chamber this occurs the exhaust valve is closed and the air Piston 13 supply vent is opened Piston Bumper 31 3 When the air supply vent opens the compressed air in the accumulator gt portion passes through the air passage and flows into the head EE valve chamber to push down the Head Valve 9 As a result the Head Valve 9 and the Cylinder 15 are sealed and at the same time the Head Valve 9 and the Exhaust Valve Rubber 11 Pushing Lever A 35 separate to open the exhaust vent 4 The compressed air above the Piston 13 is discharged into the atmosphere through the To the head valve chamber exhaust vent In this way the air pressure above Air supply vent Accumulator the Piston 13 is reduced and the greater pressure of the air accumulated in the return air chamber pushes the Piston 13 upward 5 If the ai
21. 9 of the The upper O ring I D 1 8 69 of the Plunger 70 is abnormal worn broken or Plunger 70 is abnormal worn broken or flawed flowed e Valve Bushing A 71 is abnormal sliding The Valve Piston 66 is abnormal sliding surface of the Plunger 70 is deformed or surface of the Plunger 70 is deformed or flawed flawed O Gasket B 40 is damaged e he Hex Socket Hd Bolt M5 x 16 42 is loose Seal surface of the Body Ass y 24 or the Cap 41 is abnormal damaged deformed or flawed 19 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 Apply grease ATTOLUB No 2 Code No 317918 to the O rings and the 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 877153 4 oz 120 cc oil feeder Code 874042 1 quart 1 Itr can Code No 876212 e f Gasket A 6 is damaged replace it and check that
22. 988 CHANGE KNOB C TRIGGER ARM C 48 884 969 PUSHING LEVER GUIDE 49 881 951 ROLL PIN D2 5X16 50 884 967 TRIGGER C 51 N 883 302 PUSHING LEVER SPRING il 47 49 B 883 305 PUSHING LEVER SPRING A ALTERNATIVE PARTS 6 04 PARTS 884 972 PUSHING LEVER NR 90AD 884 974 ADJUSTER 880 093 ROLL PIN D2X16 882 890 ADJUSTER SPRING 884 973 882 886 ADJUSTER PLATE C ADJUSTER PLATE A 884 971 PUSHING LEVER B 872 822 O RING S 5 872 971 RETAINING RING E TYPE FOR D3 SHAFT 877 763 884 963 FEED PISTON O RING I D 14 VALVE BUSHING B 873 570 O RING P 18 676 531 O RING P 7 884 964 VALVE PISTON 872 654 884 966 O RING 1AP 10 PLUNGER SPRING 878 888 O RING I D 1 8 884 965 PLUNGER 884 962 VALVE BUSHING A 884 984 963 837 HANDLE ARM NYLON NUT M6 883 499 SLEEVE 884 979 MAGAZINE COVER 884 977 MAGAZINE 984 443 884 981 HEX SOCKET HD BOLT W FLANGE M6X12 NAIL FEEDER A 949 682 ROLL PIN D4X32 10 PCS 884 982 NAIL FEEDER B 943 364 NEEDLE ROLLER D4X20 883 503 884 978 RIBBON SPRING NAIL RAIL 884 983 FEEDER SPRING 949 749 ROLL PIN D3X8 10 PCS 884 955 LABEL B 884 980 NAIL FEEDER ASS Y LABEL C
23. A 58 Fig 22 29 10 5 Disassembly and Reassembly of the Cap and the Magazine Section 1 Magazine 77 Nail Feeder Ass y 88 and the related parts See Fig 23 Tools required Hex bar wrench 5 Vrench M6 Roll pin puller 3 mm 0 118 dia Wooden hammer a Disassembly Holding the Nylon Nut M6 74 with a wrench M6 remove the Hex Socket Hd Bolt M6 x 22 36 and pull out the entire magazine section backward Pull out the Roll Pin x 8 86 with a roll pin puller 3 mm dia and remove the Nail Feeder Ass y 88 Ribbon Spring 83 and Needle Roller D4 x 20 82 from the front of the Magazine 77 Remove the three Hex Socket Hd Bolts W Flange M6 x 12 78 Then the Handle Arm 73 and the Magazine Cover 76 can be removed together with the other parts The Nail Rail 84 that is press fitted into the Magazine 77 has a protrusion at the rear end to prevent coming off Tap at the front of the Magazine 77 using a hammer and a bar being careful not to scratch the parts b Reassembly Disassembly procedures should be followed in the reverse order Note the following points Insert the Nail Rail 84 from the rear of the Magazine 77 and press fit the Nail Rail 84 into the Magazine 77 by tapping with a wooden hammer so that the rear end of the Nail Rail 84 becomes flush with the Magazine 77 Hook the hook of the Ribbon Spring 83 on the Magazine 77 then mount the Nail
24. MECHANISM or CONTACT ACTUATION MECHANISM in accordance with the work to be performed Each nailing operation is as follows O SINGLE ACTUATION MECHANISM SINGLE SEQUENTIAL ACTUATION MECHANISM First press the pushing lever against the wood next pull the trigger to drive the nail First pull the trigger next press the pushing lever against the wood to drive the nail After nailing once nailing will not be possible again until the trigger is released and pressed again O CONTACT ACTUATION MECHANISM First press the pushing lever against the wood next pull the trigger to drive the nail First pull the trigger next press the pushing lever against the wood to drive the nail If the trigger is held back a nail will be driven each time the pushing lever is pressed against the wood Nailing operation switching device Switching device Change knob SINGLE ACTUATION CONTACT ACTUATION MECHANISM MECHANISM Switching device Switching device upward position downward position 5 3 Nail Selection The Model NR 90AD utilizes D head clipped head nails collated with paper tape Applicable nail dimensions are shown below Please note that screw type nails cannot be used with the Model NR 90AD CAUTION Ensure that nails are as specified in Fig 1 The Model NR 90AD utilizes D head clipped head nails collated at an angle of 35 degrees which are the same as the nails utilized by P However some D head nails made by other make
25. PCS 884 952 HEAD GUARD 884 986 SHEET 878 877 HEX SOCKET HD BOLT W FLANGE 6 30 884 951 884 953 EXHAUST COVER GASKET A 884 949 HEAD VALVE SPRING 884 947 O RING I D 49 4 884 946 HEAD VALVE 1 884 948 884 950 O RING LD 59 4 EXHAUST VALVE RUBBER 884 958 PISTON O RING 884 957 PISTON 884 945 VALVE RUBBER 16 884 941 884 942 CYLINDER O RING I D 59 6 17 884 944 CYLINDER PLATE 18 884 943 O RING I D 94 6 19 877 317 CYLINDER RING 20 949 539 884 975 ROLL PIN D3X25 10 PCS ROLL PIN D3X32 955 479 RETAINING RING E TYPE FOR D6 SHAFT NAME PLATE 884 940 BODY ASS Y 27 884 956 876 205 PROTECTOR WASHER 28 884 976 PUSHING LEVER COVER A 29 884 961 NOSE 30 306 437 NYLOCK HEX SOCKET HD BOLT M8X30 31 884 959 884 960 PISTON BUMPER O RING S 63 877 371 NYLON NUT M5 884 985 NOSE RUBBER 884 970 PUSHING LEVER A 949 670 HEX SOCKET HD BOLT M6X22 10 PCS 37 884 987 GRIP RUBBER B 38 GRIP RUBBER A 39 HITACHI LABEL 40 883 678 GASKET B 41 884 954 CAP 42 949 821 HEX SOCKET HD BOLT 5 16 10 PCS 43 872 035 DUST CAP 44 959 155 STEEL BALL D3 97 10 PCS 45 982 454 SPRING C 46 47 884 968 884
26. Piston O ring is worn or damaged e Piston bumper is abnormal dislocated deformed or damaged e O ring of the cylinder is abnormal dislocated deformed or damaged e Driver blade is abnormal deformed burrs damaged or fatigued worn abnormal galled damaged or needs oil e Head valve spring is abnormal fatigued or damaged lt Control valve section gt e Plunger valve piston valve bushing A or valve bushing B is abnormal galled or damaged e O ring is worn or oiling is needed e For short nails the adjuster is raised too high Nails are not fully fed into the injection port Unspecified nails are used Driver blade is worn Workpiece is very hard e Nail feeder A is abnormal worn or damaged e Head valve sliding surface is While operating the nailer e Pull the nail feeder backward and perform idle driving Check if the driver blade has returned e Cylinder s internal surface is Check if nails can be driven abnormal deposits of dirt or at 5 kgf cm without nails check if the drivng operation is performed After operating the nailer without nails check if the driver blade is kept in the down position e After making idle driving check if the driver blade is kept in the down position e Disassemble the control valve and check the O ring Check if the adjuster is raised too high e See item 1 e Check if the driver blade
27. derstand tool labels and manual Failure to follow warnings could result in DEATH or SERIOUS INJURY Operators and others in work area MUST wear safety glasses with side shields Keep fingers AWAY from trigger when not driving fasteners to avoid accidental firing Choice of triggering method is important Check manual for triggering options NEVER point tool at yourself or others in work area DISCONNECT AIR before servicing unjamming or when not in use NEVER use oxygen or other bottled gasses Explosion may occur eDO NOT EXCEED 120psi 8 3bar C327169D 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 Handling Instructions 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 protection 1926 302 Power operated hand tools ANSI SNT 101 2002 Portable Compressed Air Actuated
28. f promoting the safest and most efficient use of the Model NR 90AD 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 Handling Instructions and fully understands the meaning of the precautions listed on the Warning Label attached to each tool 7 1 Handling Instructions Although every effort is made in each step of design manufacture and inspection to provide protection against safety hazards the dangers inherent in the use of any 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 Handling Instructions to enhance the safe efficient use of the tool by the customer Salespersons must be thoroughly familiar with the contents of the Handling Instructions to be able to offer appropriate guidance to the customers during sales promotion 7 2 Warning Label Each Model NR 90AD 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 Hitachi Koki MADE IN JAPAN OAD 31 2 STRIP NAILER Air Pressure 70 120psi Nail LengthxDia 2 x 113 3 1 2 148 DANGER io 7 W Read and un
29. l Feeder B 81 Insert the Feeder Spring 85 between the protrusion of Nail Feeder A 79 and the protrusion of Nail Feeder B 81 Protrusion Roll Pin D4 x 32 80 Feeder Ass y 88 N Nail Feeder A 79 Ng Nail Feeder 81 Feeder Spring 85 Protrusion Fig 24 3 Disassembly and reassembly of the cap See Fig 25 Tool required Hex bar wrench 4 mm a Disassembly Remove the three Hex Socket Hd Bolts M5 x 16 42 then the Cap 41 and Gasket B 40 can be removed b Reassembly Reassembly can be accomplished by following the disassembly procedures in reverse Hex Socket Hd Bolt M5 x 16 42 Cap 41 Gasket B 40 Body Ass y 24 11 INSPECTION AND CONFIRMATION AFTER REASSEMBLY e Check that Nail Feeder 81 slides in the Magazine 77 smoothly e Check that the Plunger 70 moves e Check that Adjuster 54 turns smoothly by hand e Check that there is no air leakage from each part e Set Change Knob C 46 to contact actuation see 5 2 While driving nails with an air pressure of 5 kgf cm 71 psi check that there is no misfiring and bending of nails Note Before conducting the driving test turn the Adjuster 54 to the deepest position e Set Change Knob C 46 to single actuation single sequential actuation see 5 2 Check that the Model NR 90AD operates by pressing Pushing Lever A 35 against a test piece first
30. ood Required nailing energy Nailer output energy kgf cm J ft Ib J 120 160 H 1 NEE pf 120 160 Mouse fe ij 4 P 1600 1 12 mm 0 47 1090 plywood x9 i di d 6 mM EEN cate eS GEN NEL an em cba lea Se 1400 A 1400 100 NR 8 Q 1200 1200 Energy 80 80 M n nah i 1 j 1 i i i i i i 1 1 i i H 19065 1000 1000 fo i i i il DER EINE 6 0 800 80 PA ar E as i SM e LE 60 800 80 si SERA SNO URN DEE 4 5 6 7 8 8 3bar 4 5 6 7 8 8 5 kgf cm Nail EE o mmxmm 60 70 80 90 100 110 120 psi Air pressure setting to drive nail flush with NR90AD EN x e L T o X e e Fig 2 Required nailing energy and nailer output energy Size of Nail mm in L iL E EE uc L iL E n uc 1 2 2n uc L iL E y uc ww Q6 0S ww 06 09 8 WW 0G 06 09 187 0 g e 6 2 ww g g WW 8 ec 10108195 pepiAoJd JON pepiAoJd JON pepiAoJd JON 2610092 uoienjoe jsneuxo
31. r pressure below the Piston 13 is higher than that of the atmosphere after the Piston 13 has fully returned the excess air pressure is discharged into the atmosphere through the Valve piston lower chamber Plunger 70 clearance between Piston Bumper 31 and the driver blade Fig 7 Control valve section po 4 Single actuation mechanism contact actuation mechanism Fig 8 and Fig 9 Single contact actuation mechanism changeover is accomplished by turning the switching device Change Knob C 46 Single actuation mechanism Switching device pi Accumulator ees ees e gess 9 upward position epe 1 Immediately after driving the first nail the e control valve should be as shown in Fig 7 Hl itn 2 When only Pushing Lever C 53 is released NC Ss Valve Piston 66 and Trigger C 50 is held as shown in Fig 8 the plate of Trigger C 50 contacts Change Knob C 46 and the Plunger 70 returns Plunger 70 M RS Trigger C 50 lowers only halfway i er ST e CARS Because of this compressed air does not flow Valve piston into the valve piston lower chamber and Valve lower chamber Piston 66 remains in the lowered position Pushing Lever C 53 Accordingly the Piston 13 remains in the Switching device Change Knob C 46 lowered position as shown in Fig 6 EE 3 When Trigger C 50 is released the Plunger Fig 8
32. rs are collated at a different angle of 26 degrees Use of such nails will cause clogging of nails and subsequent damage to the nailer Also avoid use of misaligned nails or nails collated with a weak paper tape Do not use P s 2 Roundrive nail eccentric full round head nail with the Model NR 90AD because it may cause bending of nails It is recommended to use genuine HITACHI nails to ensure satisfactory driving quality Paper tape collated strip nails D head clipped head nails Minimum Maximum A M bra 2 E E _3 8 mm x 90 mm nails 0 148 x 3 1 2 SSSSSSSSSS A Fig 1 Dimensions of nail 5 4 Nail Driving Force Figure 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 nailing energy required for driving the nail allows the nail to be fully driven For example when driving a nail of 3 3 mm dia by 90 mm length 0 131 x 3 1 2 into nine sheets of 12 mm plywood 108 mm thick with the Model NR 90AD a pressure of about 6 8 bar 6 9 kgf cm 99 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 data because those values vary depending on the type moisture content and grain of w
33. shaped and made of aluminum to achieve the light weight 2 The magazine cover is integral with the anti backing ratchet to achieve the light weight Output section Driving section Head Guard 2 Exhaust Cover 5 Head Valve 9 Control valve section A To Exhaust Valve Cap 41 mm ON Rubber 11 2 Accumulator RI E Piston 13 Driver blade Cylinder 15 Body Ass y 24 gt P PN Piston Bumper 31 SN ALA NN Nose 29 XL Pushing Lever A 35 Control valve section Valve Piston 66 Plunger Spring 68 ger Spring 68 Valve Bushing B 63 Valve Bushing A 71 7 Switching device ZU Change Knob 46 Trigger C 50 Fig 3 Construction 10 8 2 Operation Principle 1 Before nailing See Fig 4 and Fig 5 1 When compressed air is fed to the main body it Exhaust Valve Rubber 11 Head Valve Head valve chamber fills the accumulator portion Spring 7 2 At the same time the compressed air flows into Air passage Head Valve 9 custa the valve piston lower chamber of the control valve ni A Accumulator VOS section and forces the Valve Piston 66 upward Seren ul Piston 13 Compressed air is then fed through the air supply He vent and air passage to the head valve chamber Cylinder hole As a result the Head Valve Spring 7 is pushed
34. surface of valve piston seized or deformed e Abnormal plunger trigger arm C pushing lever C and or body worn or damaged The position of a switching device is mistaken 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 O ring and the inner outer surfaces of the cylinder for abnormal condition e Check if the nails are specified ones e Check if they move smoothly after putting nails and check if the nail feeder operates smoothly e Check if the driver blade tip 15 worn e Check nail feeder A for abnormal condition e Perform idle driving or actually drive with nails and check if the driver blade has returned completely e Disassemble the control valve section and check the O ring of the plunger and the valve piston e Check each part for abnormalities worn damaged deformed etc The position of a switching device 15 checked 16 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 driver blade e Replace the defective part Use specified nails See Magazine in item 1 Replace the part
35. then pulling Trigger 50 Check that the Piston 13 is still showing from the Nose 29 tip outlet of nails after Pushing Lever A 35 is released from the test piece with Trigger C 50 pulled e Recheck the tightening torque of each screw e Check that Pushing Lever 35 slides Check that the machine will not operate only by pulling Trigger 50 Also check that the machine will not operate only by depressing Pushing Lever A 35 cde 12 STANDARD REPAIR TIME UNIT SCHEDULES wm o Work Flow Exhaust Cover Head Valve Spring Nose Nail Feeder O ring x 2 Head Valve Exhaust Valve Magazine Cover Rubber 89 Magazine Nail Feeder A Nail Feeder B Ribbon Spring E Pushing Lever Cylinder Body Ass y A Valve Rubber Pushing Lever g e O ring 2 Trigger C Cylinder Plate Cylinder Ring Plunger Spring B Plunger Spring A Pushing Lever C Adjuster Pushing Lever B O ring Valve Bushing B Feed Piston O ring O ring x 6 Valve Piston Plunger Spring Plunger Valve Bushing A Change Knob C Spring C Piston Piston O ring Piston Bumper O ring Adjustment Cylinder Body Valve 34 LIST NO E016 Hitachi Power Tools PNEUMATIC TOOL PARTS LIST STRIP NAILER 2004 6 15 Model NR 90AD E1 PARTS TEN cone no E mme _ 949 665 NR 90AD HEX SOCKET HD BOLT M5X14 10
36. ves in the control valve unit will be aligned with the roll pin holes in the Body Ass y 24 First insert the roll pin puller 3 mm dia into the roll pin holes Then upon confirming that the puller passes through the hole drive in the Roll Pins D3 x 25 20 and D3 x 32 21 If an attempt is made to drive the roll pin with force when the roll pin grooves in Valve Bushings A 71 and B 63 is not aligned with the roll pin holes in the Body Ass y 24 it will damage the periphery of Valve Bushing A 71 and B 63 and prevent disassembly or reassembly Roll pin groove in F Valve Bushing A 71 Align Roll pin groove in Valve Bushing B 63 TR Body Ass y 24 Roll Pin D3 x 25 20 Roll pin holes Roll Pin D3 x 32 21 Roll pin groove gt jJe Roll pin groove Fig 18 After assembly make sure that the Plunger 70 moves smoothly 26 10 4 Disassembly and Reassembly of the Driving Section See Fig 19 Tools required Hex bar wrench 5 mm and 6 mm Roll pin puller 2 5 mm 0 098 dia Vrench M6 1 Disassembly and resassembly of Nose 29 Pushing Lever A 35 and other parts a Disassembly Holding the Nylon Nut M6 74 with a wrench M6 remove the Hex Socket Hd Bolt M6 x 22 36 and pull out the entire magazine section backward Remove the Hex Socket Hd Bolt M5 x 14 1 and take out Pushing Lever Cover A 28 Remove the Nylock Hex
37. w build up Subflooring and roof decking Wall sheathing Mobile home and modular housing construction 4 SELLING POINTS Lightweight only 3 2 kg 7 0 lbs and good balance New aggressive appearance ag m Comfortable grip if S A With single actuation Rapid driving and contact actuation selector quick response Tool less depth adjustment 5 SPECIFICATIONS 5 1 Specifications Operating pressure 5 8 5 kgf cm 70 120 psi 4 9 8 3 bar Gauge pressure Weight Dimensions 462 mm x 322 mm x 125 mm Length x Height x Width 18 3 16 x 12 11 16 x 4 15 16 dial Air consumption 2 5 Itr cycle at 7 kgf cm 0 088 at 100 psi 2 5 Itr cycle at 6 9 bar Packaging Package dimensions 587 mm x 398 mm x 136 mm Length x Height x Width 23 1 8 x 15 21 32 x 5 11 32 Standard accessories Safety glasses Code 875769 Pneumatic tool lubricant Pneumatic tool lubricant 1 oz oil feeder Code No 877153 Optional accessories 4 oz oil feeder Code 874042 Pneumatic tool lubricant 1 quart can Code No 876212 Grease ATTOLUB 2 500 g 1 1 Ibs Code No 317918 5 2 Explanation of the Nailing Action To meet the requirements of ANSI SNT 101 2002 the Model NR 90AD is equipped with a nailing operation switching device at the valve portion as shown in the figures below Use SINGLE ACTUATION MECHANISM SINGLE SEQUENTIAL ACTUATION

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