Hitachi NR 90AD (S) Technical Data And Service Manual Download Page 4

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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

(5) Selective actuation (single actuation/contact actuation)

(6) Tool-less depth adjustment

(7) Comfortable grip

3. APPLICATIONS

Floor and framing

Truss build-up, window build-up

Subflooring and roof decking

Wall sheathing

Mobile home and modular housing construction

4. SELLING POINTS

With "single actuation/
contact actuation" selector

New aggressive appearance

Low height

Rapid driving and
quick response

Tool-less depth
adjustment

Comfortable grip

Lightweight, only 3.2 kg (7.0 lbs.) and good balance

Summary of Contents for NR 90AD (S)

Page 1: ...TECHNICAL DATA AND SERVICE MANUAL STRIP NAILER NR 90AD SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E016 Jun 2004 N MODEL NR 90AD Hitachi Power Tools ...

Page 2: ...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 Paslode F 350S Q SENCO FramePro 701XP ...

Page 3: ...ration Principle 11 9 TROUBLESHOOTING GUIDE 14 9 1 Troubleshooting and Correction 14 9 2 Regrinding the Driver Blade 17 9 3 Possible Causes and Correction of Air Leakage 18 10 DISASSEMBLY AND REASSEMBLY 20 10 1 General Precautions in Disassembly and Reassembly 20 10 2 Disassembly and Reassembly of the Output Section 21 10 3 Disassembly and Reassembly of the Control Valve Section 24 10 4 Disassembl...

Page 4: ...ght 3 Rapid driving and quick response mechanism 4 New aggressive appearance 5 Selective actuation single actuation contact actuation 6 Tool less depth adjustment 7 Comfortable grip 3 APPLICATIONS Floor and framing Truss build up window build up Subflooring and roof decking Wall sheathing Mobile home and modular housing construction 4 SELLING POINTS With single actuation contact actuation selector...

Page 5: ... spring Air consumption Air inlet Package dimensions Length x Height x Width Packaging 587 mm x 398 mm x 136 mm 23 1 8 x 15 21 32 x 5 11 32 Safety glasses Code No 875769 1 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 5 SPECIFICATION...

Page 6: ... 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 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 th...

Page 7: ...d 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 qu...

Page 8: ...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 cm2 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 ty...

Page 9: ... 8 2 0 ltr cycle 0 07 ft 3 cycle 89 Top loading Aluminum 3 7 kg 8 2 lbs With wrench P Driving depth adjustment mechanism Tool not required Not provided With wrench Protection of free fire Not provided Not provided Provided Direction change of exhaust air Handing grip Applicable nails Clip head Length Dia Not provided Rubber 50 mm 90 mm 2 3 1 2 2 9 mm 3 8 mm 0 113 0 148 Not provided Rubber 50 mm 83...

Page 10: ...t 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 wi...

Page 11: ...sted 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...

Page 12: ...e 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 s...

Page 13: ... Output section Head Valve 9 Exhaust Valve Rubber 11 Accumulator Piston Bumper 31 Nose 29 Pushing Lever A 35 Control valve section Plunger Spring 68 Plunger 70 Valve Piston 66 Valve Bushing B 63 Valve Bushing A 71 Control valve section Switching device Change Knob C 46 Trigger C 50 Head Guard 2 Magazine section ...

Page 14: ...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 9 overcomes the strength of the Head Valve Spring 7 the Head Valve 9 is pushed upward At this time the Head Valve 9 seals with the Exhaust Valve Rubber 11 blocking the passage to the exhaust vent ...

Page 15: ...t Valve Rubber 11 separate to open the exhaust vent 4 The compressed air above the Piston 13 is discharged into the atmosphere through the exhaust vent In this way the air pressure above 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 air pressure below the Piston 13 is higher than that of the atmosphere after ...

Page 16: ...ve piston lower chamber and the Valve Piston 66 is forced upward The Piston 13 then returns fully upward Therefore unless Trigger C 50 is released after each nailing operation the structural mechanism prevents the next nailing operation Contact actuation mechanism Switching device downward position 1 Immediately after the first nail is driven the control valve should be as shown in Fig 7 2 Even wh...

Page 17: ... 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 18: ...ept in the down position After making idle driving check if the driver blade is kept in the down position Disassemble the control valve and check the O ring Adjust for 5 to 8 5 kgf cm2 Replace the piston O ring Replace the piston bumper Reassemble or replace Repair or replace Remove the dirt and apply oil or replace Replace the defective part Apply grease Replace the head valve spring Replace the ...

Page 19: ... Replace the driver blade Replace the defective part Adjuster is improperly adjusted Air pressure is too low Workpiece is very hard Driver blade is worn Piston O 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 surface Turn the adjuster to the lowest position and drive a nail Drive a nail into so...

Page 20: ...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 Fig 10 Concave Grinding surface Driver blade 5 ...

Page 21: ...ontrol valve OFF With control valve ON The O ring I D 49 4 8 of the Head Valve 9 is abnormal or its sliding surface a is worn deformed or flawed The Valve Rubber 14 is abnormal or the sealing surface b of the Head Valve 9 is worn or flawed The Exhaust Valve Rubber 11 is abnormal or the sliding surface c of the Head Valve 9 is worn or flawed A Exhaust port B Exhaust cover The Hex Socket Hd Bolt W F...

Page 22: ...kage point Possible cause 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 Piston Bumper 31 is abnormal portion d is damaged deformed or cracked The Piston 13 is abnormal driver blade is deformed or seal surface is deformed The lower O ring I D 1 8 69 of the Plunger 70 is ...

Page 23: ...quired 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 Use the conventional grip tape for repair of Grip Rubber A 38 because Grip Rubber A 38 c...

Page 24: ...xhaust Valve Rubber 11 Bar of 4 to 5 mm dia Hammer Tools required Hex bar wrench 4 mm 5 mm Hammer a Disassembly Remove the four Hex Socket Hd Bolts M5 x 14 1 with a hex bar wrench The Head Guard 2 and the Sheet 3 can now be removed Remove the four Hex Socket Hd Bolt W Flange 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 ins...

Page 25: ...ted over the projection of the Exhaust Cover 5 Exhaust Cover 5 Apply grease of 3 grams to the sliding potion Head Valve 9 Exhaust Valve Rubber 11 Push until the rubber is fully seated over the projection 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 m...

Page 26: ... 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 Apply designated grease to the O ring I D 94 6 18 O ring I D 59 6 16 and then install them Fig 14 Disassembly and reassembly of the cylinder piston piston bumper etc Cylinder Ring 19 Cylinder 15 O ring I D 59 6...

Page 27: ...embly and reassembly of the control valve section Tools required Flat blade screwdriver Roll pin puller 3 mm 0 118 dia Valve Piston 66 Plunger Spring 68 Valve Bushing A 71 Plunger 70 Feed Piston O Ring I D 14 62 Body Ass y 24 Roll Pin D3 x 32 21 Retaining Ring E type for D6 Shaft 22 O ring I D 1 8 69 O ring 1AP 10 67 O ring P 7 65 O ring P 7 65 O ring P 18 64 Valve Bushing B 63 Steel Ball D 3 97 4...

Page 28: ...areful 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 Valve Bushing B 63 Holes Wire wi...

Page 29: ...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...

Page 30: ...ig 19 Disassembly and reassembly of the driving section Pushing Lever Guide 48 Tools required Hex bar wrench 5 mm and 6 mm Roll pin puller 2 5 mm 0 098 dia Wrench 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 t...

Page 31: ...concave portion of the Pushing Lever Guide 48 After reassembly check the components of the pushing lever and the Adjuster 54 move smoothly Adjuster 54 Pushing Lever C 53 Align these portions 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 Pushing Lever Guide 48 Bent portion of Adjuster Pl...

Page 32: ...6 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 C 57 facing its convex portion toward Adjuster Plate A 58 Fig 22 Adjuster 54 Convex portion Bent portion Adjuster Plate C 57 Adjuster Spring 56 Bent portion...

Page 33: ...er 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 ...

Page 34: ...tightening or removing the Hex Socket Hd Bolt M6 x 22 36 Nylon Nut M6 74 Needle Roller D4 x 20 82 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 S...

Page 35: ... A 79 and the protrusion of Nail Feeder B 81 Fig 24 Protrusion Nail Feeder B 81 Nail Feeder Ass y 88 Roll Pin D4 x 32 80 Protrusion Nail Feeder A 79 Feeder Spring 85 Fig 25 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 ac...

Page 36: ...on 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 then pulling Trigger C 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 Recheck the tightening torque of each...

Page 37: ...agazine Nail Feeder A Nail Feeder B Ribbon Spring Pushing Lever A Pushing Lever Guide Trigger C Plunger Spring B Plunger Spring A Pushing Lever C Adjuster Pushing Lever B O ring General Assembly Cylinder Valve Rubber O ring x 2 Cylinder Plate Cylinder Ring Body Ass y Adjustment Cylinder Body Valve Valve Bushing B Feed Piston O ring O ring x 6 Valve Piston Plunger Spring Plunger Valve Bushing A Cha...

Page 38: ...PNEUMATIC TOOL PARTS LIST LIST NO E016 STRIP NAILER Model NR 90AD 2004 6 15 E1 Hitachi Power Tools ...

Page 39: ...ETAINING RING E TYPE FOR D6 SHAFT 1 23 NAME PLATE 1 24 884 940 BODY ASS Y 1 INCLUD 37 38 25 884 956 PROTECTOR 1 27 876 205 WASHER 1 28 884 976 PUSHING LEVER COVER A 1 29 884 961 NOSE 1 30 306 437 NYLOCK HEX SOCKET HD BOLT M8X30 4 31 884 959 PISTON BUMPER 1 32 884 960 O RING S 63 1 33 877 371 NYLON NUT M5 1 34 884 985 NOSE RUBBER 2 35 884 970 PUSHING LEVER A 1 36 949 670 HEX SOCKET HD BOLT M6X22 10...

Page 40: ...31 O RING P 7 2 66 884 964 VALVE PISTON 1 67 872 654 O RING 1AP 10 1 68 884 966 PLUNGER SPRING 1 69 878 888 O RING I D 1 8 2 70 884 965 PLUNGER 1 71 884 962 VALVE BUSHING A 1 73 884 984 HANDLE ARM 1 74 963 837 NYLON NUT M6 4 75 883 499 SLEEVE 1 76 884 979 MAGAZINE COVER 1 77 884 977 MAGAZINE 1 78 984 443 HEX SOCKET HD BOLT W FLANGE M6X12 3 79 884 981 NAIL FEEDER A 1 80 949 682 ROLL PIN D4X32 10 PC...

Page 41: ...ONAL ACCESSORIES ITEM NO CODE NO DESCRIPTION REMARKS NO USED STANDARD ACCESSORIES ITEM NO CODE NO DESCRIPTION REMARKS NO USED NR 90AD Printed in Japan 040615N 501 875 769 SAFETY GLASSES 1 601 881 768 GRIP TAPE A 1 602 880 407 TAPE 1 ...

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