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(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) 

[45]

).

Single actuation mechanism (Switching device:

upward position):

1) Immediately after driving the first nail, the

control valve should be as shown in Fig. 7.

2) When only Pushing Lever (C) 

[52]

 is released

and Trigger (C) 

[49]

 is held as shown in Fig. 8,

the plate of Trigger (C) 

[49]

 contacts Change

Knob (C) 

[45]

 and the Plunger 

[69]

 returns

(lowers) only halfway.

Because of this, compressed air does not flow

into the valve piston lower chamber, and Valve

Piston 

[65]

 remains in the lowered position.

Accordingly, the Piston 

[13]

 remains in the

lowered position as shown in Fig. 6.

3) When Trigger (C) 

[49] 

is released, the Plunger

[69]

 returns (lowers) completely as shown in

Fig. 5.  Compressed air then flows into the valve

piston lower chamber, and the Valve Piston 

[65]

is forced upward.  The Piston 

[13]

 then returns

fully upward.  Therefore, unless Trigger (C) 

[49]

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 when only Pushing Lever (C) 

[52]

 is

released and Trigger (C) 

[49]

 is held, the

Plunger 

[69]

 returns (lowers) completely as

shown in Fig. 9.  Thus the Piston 

[13]

 returns

(raises) fully.  Accordingly, continuous nailing

can be accomplished by pushing only Pushing

Lever (C) 

[52]

 up and down while holding

Trigger (C) 

[49]

 depressed.

Plunger 

[69]

Pushing Lever (C) 

[52]

Valve piston
lower chamber

Trigger (C) 

[49]

Valve Piston 

[65]

Accumulator

Switching device (Change Knob (C) 

[45]

)

(Upward position)

Fig. 8  Single actuation mechanism

Plunger 

[69]

Pushing Lever (C) 

[52]

Valve piston
lower chamber

Trigger (C) 

[49]

Valve Piston 

[65]

Accumulator

Switching device (Change Knob (C) 

[45]

)

(Downward position)

Fig. 9  Contact actuation mechanism

Summary of Contents for NR 90AE (S)

Page 1: ...TECHNICAL DATA AND SERVICE MANUAL STRIP NAILER NR 90AE SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No E030 Dec 2005 N MODEL NR 90AE Hitachi Power Tools ...

Page 2: ...ICE 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 Y PASLODE F 350SRH R Dewalt D51845 P SENCO 700XL ...

Page 3: ...echanism 9 8 2 Operation Principle 11 9 TROUBLESHOOTING GUIDE 14 9 1 Troubleshooting and Correction 14 9 2 Possible Causes and Correction of Air Leakage 17 10 DISASSEMBLY AND REASSEMBLY 19 10 1 General Precautions in Disassembly and Reassembly 19 10 2 Disassembly and Reassembly of the Output Section 20 10 3 Disassembly and Reassembly of the Control Valve Section 23 10 4 Disassembly and Reassembly ...

Page 4: ... 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 ...

Page 5: ...ral spring Air consumption Air inlet Package dimensions Length x Height x Width Packaging 542 mm x 402 mm x 139 mm 21 11 32 x 15 53 64 x 5 15 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 SPECIFIC...

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: ...re the same as the nails utilized by the Model NR 83A2 However some round head nails made by other makers are collated at a different angle 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 plastic It is recommended to use genuine HITACHI nails to ensure satisfactory driving quality 7 mm 0 286 2 9 mm ...

Page 8: ... 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 90AE a pressure of about 7 5 bar 7 6 kgf cm2 108 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 Figure 2 should be used as reference data because those values vary depending on the ty...

Page 9: ...nd 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 mm 2 3 1 4 Tool not required 5 8 5 kgf cm 2 70 100 psi 529 mm x 325 mm x 127 mm 20 13 16 x 12 3 4 x 5 2 35 ltr cycle 0 074 ft 3 cycle 64 nails 2 strips Top loading 3 5 kg 7 7 lbs With wrench R Provided Rubber 50 mm 90 mm 2 3 1 2 2 9 mm 3 8 mm 0 113 0 148 Single actuation contact actuat...

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: ...ion The basic structure is the same as that of the Model NR 90AD Control valve section The basic structure is the same as that of the Model NR 90AD 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 NR 90AD Magazine section Most of the parts have been newly designed 1 The magazine is the same rear load...

Page 13: ... Output section Head Valve 9 Exhaust Valve Rubber 11 Accumulator Piston Bumper 30 Nose 28 Pushing Lever A 34 Control valve section Plunger Spring 67 Plunger 69 Valve Piston 65 Valve Bushing B 62 Valve Bushing A 70 Control valve section Switching device Change Knob C 45 Trigger C 49 Head Guard 2 Magazine section ...

Page 14: ...t 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 ven...

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 65 is forced upward The Piston 13 then returns fully upward Therefore unless Trigger C 49 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 clipped 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 burr...

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: ...rol 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 Flan...

Page 21: ...age point Possible cause With control valve OFF With control valve ON The O ring I D 60 31 of the Nose 28 or the groove is abnormal broken or flawed The Nylock Hex Socket Hd Bolt M8 x 30 29 is loose The Piston Bumper 30 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 68 of the Plunger 69 is...

Page 22: ...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 37 because Grip Rubber A 37 c...

Page 23: ...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 Bolts 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 in...

Page 24: ...ed over the projection of the Exhaust Cover 5 Exhaust Cover 5 Apply grease of 3 grams to the sliding portion 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 25: ...ssembly 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 and the 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 ...

Page 26: ...sembly and reassembly of the control valve section Tools required Flat blade screwdriver Roll pin puller 3 mm 0 118 dia Valve Piston 65 Plunger Spring 67 Valve Bushing A 70 Plunger 69 Feed Piston O Ring I D 14 61 Body Ass y 24 Roll Pin D3 x 32 21 Retaining Ring E type for D6 Shaft 22 O ring I D 1 8 68 O ring 1AP 10 66 O ring P 7 64 O ring P 7 64 O ring P 18 63 Valve Bushing B 62 Steel Ball D3 97 4...

Page 27: ...ON Be careful not to damage the Valve Piston 65 Valve Bushings A 70 and B 62 etc Do not pull out the end of the Plunger 69 with the pliers 3 To take out Valve Bushing B 62 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 62 as shown in Fig 17 Valve Bushing B 62 Holes ...

Page 28: ...nit 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 70 and B 62 are not aligned with the roll pin holes in the...

Page 29: ...9 Disassembly and reassembly of the driving section Pushing Lever Guide 47 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 28 Pushing Lever A 34 and other parts a Disassembly Holding the Handle Arm 71 remove the Hex Socket Hd Bolt M6 x 22 35 and pull out the entire magazine section backward Remove the Hex Socket Hd Bolt M...

Page 30: ... concave portion of the Pushing Lever Guide 47 After reassembly check the components of the pushing lever and the Adjuster 53 move smoothly Adjuster 53 Pushing Lever C 52 Align these portions Fig 20 Be careful of the mounting direction of the Nose Rubber 33 As shown in Fig 21 mount the two Nose Rubbers 33 so that their convex portions face downward Pushing Lever Guide 47 Bent portion of Adjuster P...

Page 31: ...6 54 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 57 facing its bent portion toward the Adjuster 53 Mount Adjuster Plate C 56 facing its convex portion toward Adjuster Plate A 57 Fig 22 Adjuster 53 Convex portion Bent portion Adjuster Plate C 56 Adjuster Spring 55 Bent portion...

Page 32: ...nd 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 The screw is opened by the cross head screwdriver and the Magazine Plate 89 is taken b Reassembly Disassembly procedures should be followed in the reverse order Note the following points Insert the Nail Rail 75 from the rear of the Magazine 76 and press fit the Nail Rail 75 ...

Page 33: ... 30 Fig 23 Magazine section Nail Feeder Ass y 87 Nose 28 Magazine 76 0 05 max 1 3 mm max ...

Page 34: ...12 77 Nylon Nut M4 88 Needle Roller D4 x 20 81 2 Nail Feeders A 78 B 80 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 87 using a V block and pull out the Roll Pin D4 x 36 79 from the top using a roll pin puller 4 mm 0 157 dia Then Nail Feeder A 78 Nail Feeder B 80 and Feeder Spring 83 can be removed Remove Nail Feeder A 78 fro...

Page 35: ... A 78 and the protrusion of Nail Feeder B 80 Fig 25 Protrusion Nail Feeder B 80 Nail Feeder Ass y 87 Roll Pin D4 x 36 79 Protrusion Nail Feeder A 78 Feeder Spring 83 Fig 26 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 41 then the Cap 40 and Gasket B 39 can be removed b Reassembly Reassembly can be ac...

Page 36: ...on Set Change Knob C 45 to single actuation single sequential actuation see 5 2 Check that the Model NR 90AE operates by pressing Pushing Lever A 34 against a test piece first then pulling Trigger C 49 Check that the Piston 13 is still showing from the Nose 28 tip outlet of nails after Pushing Lever A 34 is released from the test piece with Trigger C 49 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: ...r Tools 87 88 89 90 91 1 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 21 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 64 66 67 68 69 68 70 71 72 72 73 74 75 77 77 78 79 80 81 82 83 84 501 76 23 85 86 ...

Page 39: ...ETAINING RING E TYPE FOR D6 SHAFT 1 23 NAME PLATE 1 24 884 940 BODY ASS Y 1 INCLUD 36 37 25 884 956 PROTECTOR 1 26 876 205 WASHER 1 27 884 976 PUSHING LEVER COVER A 1 28 885 521 NOSE 1 29 306 437 NYLOCK HEX SOCKET HD BOLT M8X30 4 30 884 959 PISTON BUMPER 1 31 884 989 O RING I D 60 1 32 877 371 NYLON NUT M5 1 33 884 985 NOSE RUBBER 2 34 884 970 PUSHING LEVER A 1 35 949 670 HEX SOCKET HD BOLT M6X22 ...

Page 40: ...AP 10 1 67 884 966 PLUNGER SPRING 1 68 878 888 O RING I D 1 8 2 69 884 965 PLUNGER 1 70 884 962 VALVE BUSHING A 1 71 885 522 HANDLE ARM 1 72 963 837 NYLON NUT M6 3 73 883 499 SLEEVE 1 74 885 523 MAGAZINE COVER 1 75 885 524 NAIL RAIL 1 76 885 525 MAGAZINE 1 77 984 443 HEX SOCKET HD BOLT W FLANGE M6X12 3 78 885 526 NAIL FEEDER A 1 79 949 547 ROLL PIN D4X36 10 PCS 1 80 885 527 NAIL FEEDER B 1 81 943 ...

Page 41: ...ONAL ACCESSORIES ITEM NO CODE NO DESCRIPTION REMARKS NO USED STANDARD ACCESSORIES ITEM NO CODE NO DESCRIPTION REMARKS NO USED NR 90AE Printed in Japan 051205N 501 875 769 SAFETY GLASSES 1 601 881 768 GRIP TAPE A 1 602 880 407 TAPE 1 ...

Page 42: ......

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