Hitachi NR 90AC2, Technical Data And Service Manual

Page 1: ...POWER TOOLS TECHNICAL DATA AND SERVICE MANUAL STRIP NAILER NR 90AC2 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E002 Sep 2001 N MODEL NR 90AC2 ...

Page 2: ...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 Symbols Utilized Competitors Company Name Model Name P SENCO SN65C Q Paslode F 350SRH ...

Page 3: ...on Principle 11 9 TROUBLESHOOTING GUIDE 13 9 1 Troubleshooting and Correction 13 9 2 Possible Causes and Corrections of Air Leakage 16 10 DISASSEMBLY AND REASSEMBLY 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 Dri...

Page 4: ...trength 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 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 The shape of the pushing lever spring is chan...

Page 5: ...136 mm 23 1 8 x 15 21 32 x 5 11 32 Nose cap Code No 881968 1 Hex bar wrench for M5 screw Code No 944458 1 Hex bar wrench for M6 screw Code No 944459 1 Hex bar wrench for M8 screw Code No 872422 1 Eye protector Code No 875769 1 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 lubri...

Page 6: ...r 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 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 wi...

Page 7: ...ing 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...

Page 8: ... Provided Not provided Provided Direction change of exhaust air Handle grip Applicable nails Length Dia Tool not required Rubber 60 90 mm 2 3 8 3 1 2 2 9 4 1 mm 0 113 0 162 Tool not required Racket grip 60 90 mm 2 3 8 3 1 2 2 9 4 1 mm 0 113 0 162 Leather 60 90 mm 2 3 8 3 1 2 2 9 4 1 mm 0 113 0 162 With wrench 5 6 8 5 kgf cm2 80 120 psi 569 x 332 x 130 mm 22 13 32 x 13 1 16 x 5 1 8 2 4 ltr cycle 08...

Page 9: ...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...

Page 10: ...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 Dri...

Page 11: ...l resistant type The rubber handle grip is adopted at the body ass y Control valve section The valve construction is similar to the Model NR 90AC Driving section The nose and pushing lever B have been newly designed Magazine section All the parts have been newly designed The rear loading type magazine is made of aluminum and equipped with an idling protector Fig 4 Construction Exhaust vent Adjuste...

Page 12: ...r O Ring B 9 Cylinder O Ring 11 O Ring 18 Piston 19 Body 22 Gasket B 40 Dust Filter 41 Part NR 90AC2 NR 90AC Dust filter is provided and the shape of gasket B is different from the Model NR 90AC Grip rubber The grooves made to the O ring are different from the Model NR 90AC O Ring O Ring Piston ring Piston ring O Ring Grip tape Material Fluororubber The size is the same as the Model NR 90AC Materi...

Page 13: ...8 Collar B 29 Part NR 90AC2 NR 90AC Collar Protruded NR 90AC 13 3 mm 0 524 NR 90AC 10 mm 0 394 Spring 32 Pushing Lever B 33 Idling protector NR 90AC2 7 mm 0 276 NR 90AC 4 5 mm 0 177 NR 90AC2 8 mm 0 315 NR 90AC 12 mm 0 472 ...

Page 14: ... 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 When the...

Page 15: ...lve 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 P...

Page 16: ... Check if nails one strip are fed smoothly into the nail injection port of the nose Use specified nails Magazine is loaded with abnormal nails bent nails large or small round head nails abnormal collation etc Nail or collating band clogs Collating band is deformed or torn Remove the abnormal nails and load the magazine with normal nails Nose Nail inlet groove of the nose is abnormal deformed burrs...

Page 17: ...ion method Remedy Pull the nail feeder backward and perform idle driving Check if the driver blade has returned Check if nails can be driven at 5 kgf cm2 While operating the nailer 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 After making idle driving check if the driver blade is kept in the...

Page 18: ... to the proper position Adjust for 5 to 8 5 kgf cm2 Do not use unspecified workpieces Replace the drive blade Replace the defective part Adjuster is improperly adjusted Air pressure is too low Workpiece is very hard Driver blade is worn Piston ring is abnormal worn or damaged Cylinder s internal surface is abnormal worn or rough 3 Head of a nail driven into a workpiece protrudes from the wood surf...

Page 19: ...h control valve OFF With control valve ON Cylinder O ring B 9 of the Head Valve 10 is abnormal or its sliding surface a is worn deformed or flawed The Head Valve Rubber 12 is abnormal or the sealing surface b of the Cylinder 17 is worn or flawed The Exhaust Valve Rubber 7 is abnormal or the sliding surface c of the Head Valve 10 is worn or flawed A Exhaust port B Exhaust cover The Hex Socket Hd Bo...

Page 20: ...wed Air leakage point Possible cause 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 The Hex Socket Hd Bolt M8 x 30 61 is loose Piston Bumper A 24 is abnormal portion d is damaged deformed or cracked The Piston 19 is abnormal driver blade is deformed or seal surface is deformed The O ring I D 1 8 59 of Plunger A 58 is ab...

Page 21: ...damage the O rings and prevent dirt entry 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 ltr can Code No 876212 If Gasket A 6 is damaged replace it and check that no air is leaking Be especially careful to prevent the entry of foreign particles into the control valve section Tightening torque for each part Bolt Tig...

Page 22: ...xhaust Cover 5 Exhaust Valve Rubber 7 Bar of 4 to 5 mm dia Hammer Tools required Hex bar wrench 5 mm Hammer a Disassembly Remove the four Hex Socket Hd Bolt W Flange M6 x 35 4 with a hex bar wrench The entire Exhaust Cover 5 can now be removed from the Body 22 Remove the Hex Socket Hd Bolt M6 x 16 1 with a hex bar wrench The Plate 2 and the Top Cover 3 can now be removed As shown in Fig 9B insert ...

Page 23: ... projection 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...

Page 24: ...sembly and Reassembly of the Control Valve Section See Fig 12 Fig 13 Valve Piston B 54 Plunger Spring 57 Valve Bushing A 60 Plunger A 58 Head Valve O Ring I D 16 8 50 Body 22 Roll Pin D3 x 22 45 Retaining Ring E type for D6 Shaft 20 O Ring I D 1 8 59 Fig 12 Disassembly and reassembly of the control valve section Trigger A 46 Flat blade screwdriver Plunger A 58 Remove Pushing Lever B 33 O Ring I D ...

Page 25: ...e careful not to damage Valve Piston B 54 Valve Bushing A 60 and B 51 etc Do not pull out the end of Plunger A 58 with the pliers 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 internal surface of Valve Bushing B 51 as shown in Fig 15 Valve Bushing B 51 Hole Wire with ...

Page 26: ...igned 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 through 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 Bush...

Page 27: ...cedures should be followed in the reverse order Note the following points Apply designated grease to the O ring 1AS 60 26 and then install it 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 Pushing Lever Stopper 71 Nail Feeder B 72 Fig 18 Tools required Hex bar wrench 5 mm and ...

Page 28: ...Magazine 76 Nail Feeder B 72 and the related parts See Fig 20 Tool required Hexagon bar wrench 5 mm a Disassembly Perform disassembly according to 10 4 to remove the entire magazine section 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 Remove the three Hex Socket Hd Bolts W Flange M6 x 12 77 Then Handle...

Page 29: ... 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 Fig 20 Hook Nylon Nut M6 65 Sleeve 66 Nail Feeder B 72 Hex Socket Hd Bolt W Flange M6 x 12 77 Pushing Lever Stopper 71 Nail Stopper 78 Needle Roller D4...

Page 30: ... 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 Insert the Pushing Lever Stopper 71 in Nail Feeder B 72 and secure with the Roll Pin D3 x 10 73 Insert the Roll Pin D4 x 40 69 into Nail Feeder B 72 Insert the Spring...

Page 31: ...nly by depressing Pushing Lever A 37 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 ass y Pushing Lever Stopper 71 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 t...

Page 32: ... Rubber 60 min 50 Nose Magazine Cover Magazine Nail Feeder A Spring Nail Feeder B Ribbon Spring Pushing Lever B Spring Adjuster A Pushing Lever A Spring C General Assembly Cylinder Plate Cylinder O ring x 4 Piston Bumper A Piston Bumper B Body Ass y 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 ...

Page 33: ...5 E1 E002 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 27 62 63 64 65 66 67 69 70 71 72 73 74 75 76 77 78 501 502 503 504 505 506 507 23 77 68 65 61 ...

Page 34: ... WARNING LABEL 1 22 883 675 BODY 1 23 NAME PLATE 1 24 883 670 PISTON BUMPER A 1 25 883 671 PISTON BUMPER B 1 26 956 996 O RING 1AS 60 1 27 881 969 NYLOCK BOLT W FLANGE M6X20 2 28 881 935 GUARD 1 29 883 674 COLLAR B 1 30 883 672 NOSE 1 31 949 864 ROLL PIN D3X22 10 PCS 1 32 883 691 SPRING 1 33 883 673 PUSHING LEVER B 1 34 881 974 ADJUSTER A 1 35 982 454 SPRING C 2 36 959 155 STEEL BALL D3 97 10 PCS ...

Page 35: ...EX SOCKET HD BOLT M8X30 10 PCS 4 62 883 690 CONNECTOR 1 63 883 682 NAIL RAIL 1 64 883 689 HANDLE ARM 1 65 963 837 NYLON NUT M6 3 66 883 499 SLEEVE 1 67 883 683 MAGAZINE COVER 1 68 883 685 NAIL FEEDER A 1 69 949 688 ROLL PIN D4X40 10 PCS 1 70 883 687 SPRING 1 71 883 688 PUSHING LEVER STOPPER 1 72 883 686 NAIL FEEDER B 1 73 949 776 ROLL PIN D3X10 10 PCS 2 74 883 503 RIBBON SPRING 1 75 943 364 NEEDLE...

Page 36: ...CODE NO DESCRIPTION REMARKS NO USED Printed in Japan 010905N 9 01 501 881 968 NOSE CAP 1 502 944 458 HEX BAR WRENCH 4MM 1 503 944 459 HEX BAR WRENCH 5MM 1 504 872 422 HEX BAR WRENCH 6MM 1 505 875 769 EYE PROTECTOR 1 506 881 976 CAUTION TAG 1 507 882 414 LEAFLET 1 601 881 973 SEQUENTIAL TRIP MECHANISM SET 1 NR 90AC2 ...

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