Hitachi NV 90HMC Technical Data And Service Manual Download Page 30

Page: 30 / 41

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Concave portion of the
Magazine

[137]

Convex portion of the Holder Shaft

[149]

Spring

[150]

Nail Holder

[145]

[140]

Boss of the Holder Shaft

[149]

Tapping Screw D3 x 14

[148]

Tow Washer M4

[147]

Convex portion of the
Nail Holder

[145]

Ratchet Spring

[146]

•

Disassembly and reassembly of the Nail Holder , the Holder Shaft , etc

2. Disassembly and reassembly of the Nail Holder , the Holder Shaft , etc

(1) Disassembly

•

Pull out the two Pins

[140]

by using the roll pin puller (

4). The Magazine

[137]

and Magazine Cover

[142]

can then be removed.

•

Remove Holder Cap (A)

[144]

and loosen the Tapping Screw D3 x 14

[148]

by using the Phillips

screwdriver. You can then detach the two Trigger Arm Ass'ys

[153]

, Nail Holder

[145]

, Holder Shaft

[149]

and Spring

[150]

(2) Reassembly

Conduct reassembly by reversing the disassembly procedure, but note the following:

•

When mounting the Tapping Screw D3 x 14

[148]

on the Holder Shaft

[149]

, firmly fit the Washer M4

[147]

to the tapping screw and mount it with the screw head on the boss side of the Holder Shaft

[149]

•

When mounting the Ratchet Spring

[146]

on the Nail Holder

[145]

, mount the Ratchet Spring

[146]

from the side opposite the protrusion of the Nail Holder

[145]

, as shown below. After reassembly,

make sure the ratchet spring is oriented as shown below.

•

When mounting the Holder Shaft

[149]

on the Magazine

[137]

, make sure the Spring

[150]

is just

between the depression of the Magazine

[137]

and the protrusion of the Holder Shaft

[149]

before

inserting the Pin

[140]

•

Confirm the following after reassembly:

○

The Nail Holder

[145]

tilts when the Magazine Cover

[142]

is opened.

○

The Nail Holder

[145]

smoothly retracts into the Magazine

[137]

when the Magazine Cover

[142]

closed.

Summary of Contents for NV 90HMC

Page 1: ... blow nozzle dual action trigger and a tool less adjuster Please expand sales of the new Model NV 90HMC Nailer PRODUCT NAME Hitachi 3 1 2 High Pressure Coil Nailer Model NV 90HMC Floor and wall framing Truss and window built up Subflooring and roof decking Crate and pallet construction MARKETING OBJECTIVE APPLICATIONS SELLING POINTS SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LI...

Page 2: ... hitachi koki com manual_view_export Throughout this TECHNICAL DATA AND SERVICE MANUAL a symbol s is are used in the place of company name s and model name s of our competitor s The symbol s utilized here is are as follows Competitors Symbols Utilized Company Name Model Name P MAX HN90 ...

Page 3: ...ual Action Trigger 6 COMPARISON WITH SIMILAR PRODUCTS 7 1 Comparison of Specifications 7 PRECAUTIONS ON SALES PROMOTION 8 1 Safety Instructions 8 TROUBLESHOOTING GUIDE 10 1 Troubleshooting and Repair 10 2 Possible Causes and Corrections of Air Leakage 15 REPAIR GUIDE 18 1 Precautions on Disassembly and Reassembly 18 Assembly Diagram for NV 90HMC ...

Page 4: ... lbs Height 322 mm 12 11 16 389 mm 15 5 16 327 mm 12 7 8 Punching force ratio 1 3 1 1 1 Nose switch mechanism Capable of changing outlet sizes Small and Large according to nail head sizes for using various kinds of nails Select a nose according to the head size of nails you use Outlet size Small Outlet size Large Nail head diameter ø 6 0 to ø 7 5 mm 0 236 to 0 295 ø 7 5 to ø 8 6 mm 0 295 to 0 339 ...

Page 5: ...ble firing in Single sequential actuation mode Tool less adjuster Rotating this adjuster adjusts the nailing depth sink quantity of the nail head Easy nail loading When you open the nail magazine cover the nail holder automatically tilts toward you so that you can easily change nail rolls Lock mechanism of trigger This lock mechanism locks the trigger so that it cannot be pulled Shallow Deep Adjus...

Page 6: ...ve type Packaging dimensions Length x Height x Width 355 mm x 410 mm x 170 mm 14 x 16 x 6 11 16 Standard accessories Case Code No 886432 Eye protector Code No 875769 Oiler 30 cc Code No 883136 Nose cap A Code No 886889 Optional accessories Pneumatic tool lubricant 1 oz oil feeder Code No 877153 Pneumatic tool lubricant 4 oz oil feeder Code No 874042 Pneumatic tool lubricant 1 Code No 876212 NOTE T...

Page 7: ...ing energy required for punching nails flush Air pressure exceeding the intersecting point between nailer output energy and the required nailing energy for punching nails ensures fully punched nails For example when punching a nail measuring 3 8 mm in dia x 90 mm in length 0 148 x 3 1 2 into a workpiece of hemlock with the Model NV 90HMC pressure of about 19 6 bar 20 kgf cm2 280 psi enables the na...

Page 8: ... 5 Required nailing energy Nailer output energy Fig 2 Required nailing energy and nailer output energy 5 ...

Page 9: ...n 3 Nail driven Single sequential actuation mode Depress the pushing lever Pull the trigger Driven Depress the pushing lever Not driven Contact action mode Pull the trigger Depress the pushing lever Driven Depress the pushing lever Driven 2 Precautions on using the dual action trigger Nails are not punched even with the pushing lever again pressed against the workpiece and the trigger pulled in si...

Page 10: ...nails 300 nails Magazine type Top loading Easy nail loading Top loading Top loading Blow nozzle Provided None None Driving depth adjustment mechanism Tool less Tool less Tool less Single actuation contact actuation selector Automatic Manual Automatic Nose cap Provided Provided Provided Free angle plug None None Provided Outlet size Switching type ø 7 mm ø 9 mm Fixed type ø 8 mm Fixed type ø 8 mm E...

Page 11: ...n the use of any pneumatic tool cannot be completely eliminated Accordingly the Instruction Manual lists general precautions and suggestions on the use of pneumatic tools and specific precautions and suggestions on use of the pneumatic nailer in order to enhance the safe efficient use of the tool by the customer Salespersons must be thoroughly familiar with the contents of the Instruction Manual t...

Page 12: ...r Otherwise the performance service life and safety of the Model NV 90HMC may be adversely affected Be sure to install a regulator when using a high pressure air compressor with pressure set to 23 kgf cm2 320 psi 23 bar or more In this case adjust the air pressure to 23 kgf cm2 320 psi 23 bar or less 2 If the dust in compressed air accumulates on the sliding portion the Model NV 90HMC will not ope...

Page 13: ... damaged or fatigued Feeder is abnormal damaged or worn Check that the punching section is not abnormal burrs deformed damaged or worn Deburr the nail guide face Correct the deformed part Replace abnormal parts Nails are not correctly loaded in the groove of the nose Check that nails are correctly loaded in the groove of the nose Load nails in the correct position in the nose Dust adheres to the f...

Page 14: ...g lever Magazine Check that a nail does not catch on another nail in the magazine Check that a nail does not catch on any part of the magazine Check the height of the nail holder Collate the nails correctly and then reload the nailer Remove burrs or deformed parts Replace the parts Adjust the height of the nail holder correctly Pushing lever Check the operation of the pushing lever Correct or repl...

Page 15: ...e control valve section and check the O rings Replace abnormal parts Apply grease Adjuster is raised too high for short nails Check that the adjuster is not raised too high Turn the adjuster lower lower the pressure Nails are not completely fed into the injection port Unspecified nails are used See item 1 See item 1 Driver blade is worn Check that the driver blade tip is not abnormally worn Replac...

Page 16: ...nd lubrication Replace abnormal parts Apply grease Check whether the specified nails are used Check the nails as follows Use specified nails Remove abnormal nails and load the nailer with proper nails 4 Nails jam Nails Unspecified nails are used Abnormal nails are mixed Nail heads are too large or too small Wire collated nails Collating wires are abnormal broken failed welding deformed or failure ...

Page 17: ... Replace abnormal parts Body Nail guide section Nail guide section is abnormal See item 1 Nail guide section See item 1 Nail guide section Driver blade does not return completely See item 1 Output section piston driver blade etc Perform idle or actual punching to check whether the driver blade returns completely See item 1 Output section piston driver blade etc 4 Nails jam continued Air pressure i...

Page 18: ... 15 OFF ON Magnified view of B Control valve section Air leakage repair location 2 Possible Causes and Corrections of Air Leakage 1 Air leakage repair location Section of A A ...

Page 19: ... O Ring I D 48 5 12 worn cut or flaws Exhaust Cover Loose Nylock Bolt M5 x 65 4 Damage on Gasket C 17 and Packing B 8 Defects on seal surfaces of Body Ass y 42 Exhaust Cover 15 Plate 9 and Upper Cover 5 damage deformation or flaws Nose1 Loose Nylock High Tension Bolt M7 x 25 56 Defects on O Ring 1AP 3 106 worn cut or flaws Defects on O Ring S 34 46 of Body Ass y 42 cut or flaws and defects on its ...

Page 20: ...fect on the inner surface of Body Ass y 42 valve chamber part Control valve Defect on O Ring S 16 87 and O Ring S 6 97 of Valve Bushing A 98 worn cut or flaws Defect on sliding surface of Plunger 95 O Ring S 6 97 deformation or flaws on part Defect on O Ring S 16 87 and O Ring S 6 97 of Valve Bushing A 98 worn cut or flaws Defect on sliding surface of Plunger 95 O Ring S 6 97 deformation or flaws ...

Page 21: ...ng and its groove clean Apply grease Attolub No 2 to the inner surface of Cylinder 36 Replace a broken Gasket C 17 and Packing B 8 with a new one and make sure it does not leak any air Always keep the control valve section away from any contaminant Apply the supplied oil to the nail feeding slide section When replacing Piston Bumper 45 be sure to check and make sure the air channels of Body Ass y ...

Page 22: ...nents of the output section Exhaust Cover 15 Cylinder 36 Piston H 11 and Cylinder Plate 38 To remove the Exhaust Cover 15 first press the Sleeve Valve 19 against the Body Ass y 42 and detach the Sleeve Valve 19 from the nailer body When removing the Valve Plate 24 be sure to first remove the Exhaust Rubber 22 Insert the tip of a precision screwdriver or other sharp pointed rod into the gap between...

Page 23: ...l not to lose any of the 16 Sleeve Valve Springs 23 The O rings of the Exhaust Cover 15 look alike Do not mix up these parts Upper side O Ring I D 48 5 12 Lower side O Ring 16 Gasket C 17 and Packing B 8 are similar Do not mix them up these parts Reassembly of the cylinder ring Valve Plate 24 Cylinder 36 Sleeve Valve 19 Sleeve Valve Spring 23 Cylinder 36 Exhaust Rubber 22 Reassembly of the sleeve ...

Page 24: ...om the Valve Bushing 33 2 Reassembly Conduct reassembly by reversing the disassembly procedure but note the following Fully apply grease to the respective O rings Mount the Retaining Ring E Type For D4 Shaft 34 on the Plunger 29 and then push the Knob 35 straight in until it contacts the Retaining Ring E Type For D4 Shaft 34 Disassembly and Reassembly of the Air Duster Valve Section Knob 35 Upper ...

Page 25: ...en comes off Pull out the Roll Pin D3 x 28 100 The Pushing Lever Guide 70 and trigger section can then be removed Pull out Roll Pin D2 5 x 16 72 The components of the trigger section can then be removed Pull out the two Roll Pins D3 x 28 100 by using the roll pin puller ø 3 and then remove the control valve section by following the procedure below a Insert the tip of the flat blade screwdriver int...

Page 26: ... S 14 86 and O Ring S 16 87 of Valve Bushing B 88 Match the concave portion of Valve Bushing A 98 with that of Valve Bushing B 88 as shown below and then insert the two Pin D2 x 8 85 into both For reassembly on the Body Ass y 42 first insert the roll pin puller ø 3 by making sure the pin passes through the roll pinhole and then hammer in the two Roll Pin D3 x 28 100 Orient the splitting of Roll Pi...

Page 27: ...g upward Reassemble the Roll Pin D2 5 x 16 72 with its splitting oriented as shown below For easier reassembly of the Trigger section onto the Body Ass y 42 mount the Trigger Spring 69 and Trigger section onto the Pushing Lever Guide 70 in advance by using the ø 3 x 19 rod Orient the splitting of the Roll Pin D3 x 28 100 as shown above at reassembly Be careful not to reverse the insertion directio...

Page 28: ...w W Washers M5 x 25 Black 105 on the Body Ass y 42 You can then detach the Magazine 137 and other parts together 2 Reassembly Conduct reassembly by reversing the disassembly procedure but note the following Fold back the Cover 131 twice fit its hole to the convex portion of the Magazine 137 and then press it with Pushing Lever Cover A 136 The Cover 131 must be located outside Pushing Lever Cover A...

Page 29: ... 14 148 Holder Cap A 144 Concave portion Spring 150 Holder Shaft 149 Nail Holder 145 Name Plate 151 Hex Socket Hd Bolt M5 x 22 115 Feeder Shaft Ring 141 Magazine Cover 142 Feeder Shaft Ring 141 Pin 140 Magazine 137 Warning Label 139 Sleeve 135 Pushing Lever Cover A 136 Ratchet Spring 146 Nylon Nut M5 134 Nylon Nut M5 134 Washer M4 147 Nose 47 Body Ass y 42 Machine Screw W Washers M5 x 25 Black 105...

Page 30: ...mbly Conduct reassembly by reversing the disassembly procedure but note the following When mounting the Tapping Screw D3 x 14 148 on the Holder Shaft 149 firmly fit the Washer M4 147 to the tapping screw and mount it with the screw head on the boss side of the Holder Shaft 149 When mounting the Ratchet Spring 146 on the Nail Holder 145 mount the Ratchet Spring 146 from the side opposite the protru...

Page 31: ...ng A 74 Pushing Lever C 75 Adjuster 76 Hex Socket Hd Bolt M5 x 22 115 Adjuster Spring 78 Adjuster Plate C 79 O Ring S 5 83 Pushing Lever B 82 Retaining Ring E Type For D3 Shaft 84 O Ring S 4 81 Nose Cap A 60 Lock Spring 49 Nose Shaft 119 Shaft Ring 117 Nose Piece A 122 Spring 121 Nose Sleeve 118 Roll Pin D2 x 16 77 Nose Bumper 116 Urethane Shaft 120 Shaft Ring 117 Change Knob 48 Roll Pin D4 x 18 5...

Page 32: ...assembly Conduct reassembly by reversing the disassembly procedure but note the following Apply grease to the O Ring S 34 46 and O Ring 1AP 3 106 fit both to the outer periphery of the inlaid part of the Nose 47 and carefully conduct reassembly Match the bent part of Adjuster Plate A 80 with the depression of the Pushing Lever Guide 70 for reassembly After reassembly make sure the push lever compo...

Page 33: ...the Piston Bumper 45 or other objects the Feed Piston 109 may not work properly So when replacing the Piston Bumper 45 clean these parts prior to reassembly Apply grease to the O Ring P 9 107 and Feed Piston O Ring 108 prior to reassembly Apply grease to the groove of the Feed Piston 109 Assemble the Bumper 112 with its stepped part on the Feed Piston 109 side Grease must be applied to the sliding...

Page 34: ...then detach Sleeve B 132 the Nail Guide Cover 130 Stopper Spring A 127 Stopper Spring B 129 and Cover 131 Remove the Shaft Ring 117 of the Guide Lock 123 by using the flat blade screwdriver and then pull out Guide Lock 123 You can remove Nail Stopper A 126 and Nail Stopper B 128 2 Reassembly Conduct reassembly by reversing the disassembly procedure but note the following Completely clean the claw ...

Page 35: ... by your fingers and make sure the Plunger 29 moves smoothly Turn the Change Knob 48 and make sure the size of the ejection port varies correctly 2 Connect compressed air to the nailer and confirm the following No air leaks from any part of the nailer The nailer is inactive when you pull the Trigger 68 while the Lock Knob 103 is in the Free position The nailer does not work when Pushing Lever A 59...

Page 36: ...27 26 41 42 99 61 63 64 100 44 100 101 102 103 105 10 11 45 56 47 55 52 51 53 54 48 49 50 121 119 122 57 117 106 115 116 123 124 125 126 127 128 129 117 130 131 132 133 65 66 67 69 70 71 72 73 75 76 77 78 79 80 81 82 84 83 58 59 60 107 108 109 110 111 112 113 114 134 135 136 137 139 134 140 141 140 141 142 151 144 146 145 148 149 150 86 87 88 89 85 68 118 104 117 501 502 503 120 147 154 142 140 13...

Page 37: ...885 846 SLEEVE VALVE SPRING 16 24 886 899 VALVE PLATE 1 25 872 767 O RING S 32 1 26 881 711 VALVE PACKING 1 27 881 900 SPRING 1 28 878 607 PLUNGER O RING 1 29 886 044 PLUNGER 1 30 873 093 O RING 1AP 3 1 31 987 105 O RING S 10 1 32 881 715 O RING S3 1 33 885 027 VALVE BUSHING 1 34 968 643 RETAINING RING E TYPE FOR D4 SHAFT 1 35 884 334 KNOB 1 36 886 894 CYLINDER 1 37 984 483 O RING S 36 1 38 886 89...

Page 38: ...3 883 302 PUSHING LEVER SPRING B 1 74 883 305 PUSHING LEVER SPRING A 1 75 882 891 PUSHING LEVER C 1 76 882 889 ADJUSTER 1 77 880 093 ROLL PIN D2 X 16 1 78 882 890 ADJUSTER SPRING 1 79 884 973 ADJUSTER PLATE C 1 80 882 886 ADJUSTER PLATE A 1 81 981 317 O RING S 4 1 82 886 043 PUSHING LEVER B 1 83 872 822 O RING S 5 1 84 872 971 RETAINING RING E TYPE FOR D3 SHAFT 1 85 949 778 PIN D2 X 8 10 PCS 2 86 ...

Page 39: ...888 SPRING 1 122 886 887 NOSE PIECE A 1 123 887 130 GUIDE LOCK 1 124 880 446 SPRING 1 125 886 884 NAIL GUIDE 1 126 883 085 NAIL STOPPER A 1 127 883 088 STOPPER SPRING A 1 128 883 086 NAIL STOPPER B 1 129 883 087 STOPPER SPRING B 1 130 883 089 NAIL GUIDE COVER 1 131 886 885 COVER 1 132 882 881 SLEEVE B 2 133 880 630 NYLOCK HEX SOCKET HD BOLT M4 X 12 2 134 877 371 NYLON NUT M5 2 135 882 907 SLEEVE 1...

Page 40: ...ESCRIPTION REMARKS 151 NAME PLATE 1 152 887 174 WARNING LABEL 1 153 886 624 TRIGGER ARM ASS Y 1 INCLUD 65 67 71 154 887 317 MAGAZINE ASS Y 1 INCLUD 137 140 142 144 150 12 09 5 ALTERNATIVE PARTS NO USED CODE NO ITEM NO ...

Page 41: ...9 SAFETY GLASSES 1 503 886 432 CASE 1 DESCRIPTION REMARKS 601 881 768 GRIP TAPE A 1 602 880 407 TAPE 2 603 876 212 PNEUMATIC TOOL LUBRICANT 1 L 1 6 Printed in Japan 12 09 091211N ALTERNATIVE PARTS OPTIONAL ACCESSORIES STANDARD ACCESSORIES ITEM NO NO USED CODE NO NO USED CODE NO ITEM NO ...

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