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Hitachi NV 75AG, Technical Data And Service Manual, Page: 24 / 45

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--- 21 ---

Loosen Hex. Socket Hd. Bolt M5 x 16 [35].
Broken Gasket (B) [32]
Defective seal surface of the Body [18] or Cap [34]

Air leakage portion

Cause

When the Trigger is turned off

When the Trigger is turned on

(G) Control valve 2

(H) Cap

Abnormality (wear, breakage and/or
scratches) in O-ring (I.D 1.8) [60] of
Plunger (A) [59]
Abnormality (deformation and/or
scratches of the sliding face of
Plunger (A) [59] in Valve Bushing (A)
[61]

Abnormality (wear, breakage and/or
scratches) in O-ring (I.D 11) [56] in
the inside of Valve Piston (B) [57]
Abnormality (deformation and/or
scratches of the sliding face of
Plunger (A) [59] in Valve Piston (B)
[57]

Summary of Contents for NV 75AG

Page 1: ...COIL NAILER NV 75AG LIST No E006 Aug 2002 POWER TOOLS TECHNICAL DATA AND SERVICE MANUAL SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT N MODEL NV 75AG ...

Page 2: ...CAL 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 Symbols Utilized Competitors Company Name Model Name SENCO SCN60 R ...

Page 3: ...ility of Parts 11 8 3 Operation Principle 12 9 TROUBLESHOOTING GUIDE 14 9 1 Troubleshooting and Correction 14 9 2 Possible Causes and Corrections of Air Leakage 19 10 DISASSEMBLY AND REASSEMBLY 22 10 1 General Precautions in Disassembly and Reassembly 22 10 2 Disassembly and Reassembly of the Output Section 23 10 3 Disassembly and Reassembly of the Control Valve Section 25 10 4 Disassembly and Rea...

Page 4: ... the trigger The tip of the nose is easy to see and operate The exhaust air outlet is 360 adjustable without tool Capable of driving either wire collated or sheet collated nails There is a demand for a high power nailer capable of driving larger diameter nails from the users of the Model NV 65AH The new Model NV 75AG can also satisfy the above demand Please expand the sales of the new Model NV 75A...

Page 5: ...ackaging 315 mm x 150 mm x 386 mm 12 3 8 x 5 7 8 x 15 1 4 Eye protector Code No 875769 1 Hex bar wrench for M6 screw Code No 944459 1 Hex bar wrench for M5 screw Code No 944458 1 Hex bar wrench for M4 screw Code No 943277 1 Nose cap Code No 883106 1 Pneumatic tool lubricant 1 oz oil feeder Code No 877153 Pneumatic tool lubricant 4 oz oil feeder Code No 872042 Pneumatic tool lubricant 1 quart can C...

Page 6: ...iving quality CAUTION Ensure that nails are as specified in Figs 1 2 and 3 Other nails will cause clogging of nails and subsequent damage to the nailer NOTE Aluminum nails may bend when driven into a hard workpiece Test before use 5 7 mm 0 224 45 mm 1 3 4 Min Fig 1 Dimensions of nails Max 6 mm 0 236 2 5 mm 0 099 2 3 mm 0 090 6 mm 0 236 45 mm 1 3 4 Min Max 7 2 mm 0 283 75 mm 3 3 3 mm 0 131 2 5 mm 0...

Page 7: ...4 L 2 3 2 5 0 090 0 099 d 20 0 787 D2 D1 61 5 2 421 118 4 645 H Fig 3 Dimensions of sheet collated nails 45 65 1 3 4 2 1 2 65 75 1 1 2 3 L 2 5 2 9 0 099 0 113 3 1 3 3 0 120 0 131 d Type B A 0 7 0 028 121 4 764 19 0 748 28 1 102 37 5 1 476 d1 D2 L1 L2 D1 72 2 835 80 3 150 H ...

Page 8: ... 75 mm length 0 131 x 3 into a workpiece of hemlock with the Model NV 75AG a pressure of about 8 bar 8 2 kgf cm2 116 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 4 should be used as a reference only because those values vary depending on the type of wood moisture content and grain of wo...

Page 9: ...x 11 13 16 x 5 1 16 1 4 ltr cycle 0 049 ft 3 cycle Bottom loading Clear plastic 2 1 kg 4 6 lbs Power ratio Length Applicable nails Diameter Collation 45 mm 75 mm 1 3 4 3 Wire 50 mm 83 mm 2 3 1 4 130 200 300 nails 200 300 nails 200 350 nails Top loading Black plastic Tool not required Tool required Tool not required None Tool not required Tool required Wire 45 mm 57 mm 1 3 4 2 1 4 2 5 mm 3 3 mm 0 0...

Page 10: ...ble to offer appropriate guidance to the customers during sales promotion 7 2 Warning Label Each Model NV 75AG unit is provided with a Warning Label illustrated below which lists basic safety precautions in its use Carefully ensure that the customers fully understand and follow these precautions before using the tool 7 3 Related Laws and Regulations As nailers and staplers are designed to instanta...

Page 11: ...ce life of the Model NV 75AG keeping good performance It is recommended to lubricate the Model NV 75AG daily Supply 5 10 drops of lubricant into the air plug on the Model NV 75AG When not in use for an extended period supply lubricant and perform idle driving two or three times to lubricate the inside then apply a thin coat of the lubricant to the steel parts to avoid rusting Usable lubricant is s...

Page 12: ...since the Model NV 75AG has an air passage to feed nails The handle is equipped with the grip rubber rubber ring type instead of the grip tape Note that the repair part is the conventional grip tape because the grip rubber cannot be replaced by hand Cylinder Newly designed Piston Newly designed Dust filter Dust filter is provided between the air inlet cap and the body to prevent dust from entering...

Page 13: ...er 28 Nose 22 Dust Filter 33 Control valve section Body 18 Grip rubber Adjuster 44 Valve Bushing B 53 Valve Bushing A 61 Plunger A 59 Valve Piston B 57 Pushing Lever A 31 Nail Holder 81 Magazine A 75 Guide Lock 87 Nail Guide 89 Cover 95 Magazine Cover A 78 Magazine section Section A A Feeder Piston 64 Feed Spring 65 Nail Guide 89 Feeder 28 Fig 5 Construction Driving section Output section ...

Page 14: ...most parts of the output section and the control valve section of the Model NV 75AG are interchangeable with those of the Model NR 65AK there is no interchangeability for the parts shown in the table below Bore diameter is concaved Plunger A Color Black Viewed from A Air passage hole to feed nails 3 mm dia Upper end surface of the cylinder Dust Filter 33 Grip rubber Gasket B 32 Viewed from A Gaske...

Page 15: ...rough air passage A 3 The air pressure applied against the lower surface of the head valve soon exceeds the force of the head valve spring and pushes the head valve up The head valve is pushed fully upward by the compressed air and seals the upper surface of the exhaust cover and the head valve 4 When the head valve is pushed up the compressed air flows rapidly into the cylinder and pushes down th...

Page 16: ... the cylinder is opened to the atmosphere 2 When the head valve seals the upper surface of the cylinder the compressed air accumulated in the return air chamber passes through air passage C presses on the lower surface of the piston and forces the piston to return upward to its original position Also the compressed air above the piston is exhausted through the head valve hole 3 The compressed air ...

Page 17: ...r pressure is too low Air passage is clogged with broken pieces of piston bumper etc Feed piston chamber contains foreign matter such as broken pieces of piston bumper etc Check that the magazine is correctly loaded with specified nails Remove the feed piston and check the feed piston sliding surface of the nose Use specified nails Remove the abnormal nails and load the nailer with proper nails Ch...

Page 18: ...se Inspection method Remedy 1 Nails cannot be driven continued Output section piston driver blade etc Air pressure is too low Piston O ring is abnormal worn or damaged Piston bumper is abnormal O ring in the cylinder is abnormal removed deformed or damaged Driver blade is abnormal deformed burrs or damaged Adjust the air pressure to 5 8 5 kgf cm2 4 9 8 3 bar 70 120 psi Open the nail guide and perf...

Page 19: ... used because the material is beyond its applicable range Check if a nail is bent even when driven into soft wood Check that the driver blade tip is not abnormally worn Replace the abnormal part Turn the adjuster lower lower the pressure See item 1 Driver blade is worn Replace the part Adjust the air pressure to 5 8 5 kgf cm2 4 9 8 3 bar 70 120 psi Nailer cannot be used because the material is bey...

Page 20: ...ng failed deformed or welding position failed Collating wires are deformed deformed in collation angle or collation pitch Sheet collated nails Collating sheets are abnormal deformed or broken Nails are removed from the sheets Use specified nails Remove the abnormal nails and load the nailer with proper nails Check if the specified nails are used Check the nails as follows Head valve sliding surfac...

Page 21: ...ring or feeder spring is abnormal damaged fatigued or removed 4 Nails jam continued Open the nail guide and check the position of the feeder claw Replace the abnormal part Body Nail guide section Nail guide section is abnormal See item 1 Nail guide section Perform idle or actual driving to check if the driver blade is returned completely Nails may be jammed if driven at a high pressure and high sp...

Page 22: ...ir 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 flaws or damage 3 And then check other places A B e f g d c b h E D C G a Control valve section H Nail feeder section G F F ...

Page 23: ...12 Body 18 and or the Cylinder 15 Abnormality deformation crack and or damage of the sections e and f in the Piston Bumper 20 Deformation of Piston H 17 The deformation of driver blade abnormality in sealed faces The deformation of the face f of the Body 18 Abnormality wear deformation breakage and or scratches in O Ring S 46 13 E Feed piston Abnormality wear breakage and or scratches in O ring P ...

Page 24: ... Control valve 2 H Cap Abnormality wear breakage and or scratches in O ring I D 1 8 60 of Plunger A 59 Abnormality deformation and or scratches of the sliding face of Plunger A 59 in Valve Bushing A 61 Abnormality wear breakage and or scratches in O ring I D 11 56 in the inside of Valve Piston B 57 Abnormality deformation and or scratches of the sliding face of Plunger A 59 in Valve Piston B 57 ...

Page 25: ...O rings and O rings sliding portions When installing the O rings be careful not to 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 B 6 is damaged replace it and check that no air is leaking Be especially careful to prevent the entry of foreig...

Page 26: ...llowing points Apply grease to the inside of the O ring I D 37 16 O ring S 70 11 O ring S 46 13 and the Cylinder 15 before reassembly Mount Gasket B 6 aligning the 6 mm 0 236 dia hole with the blowhole of the Body 18 10 2 Disassembly and Reassembly of the Output Section See Fig 10 Hex Socket Hd Bolt M6 x 12 1 Plate 2 Head Bumper 7 Gasket B 6 Exhaust Cover 5 Top Cover 3 Hex Socket Hd Bolt M5 x 35 4...

Page 27: ...ply grease to the lip portions and of Head Valve A 10 Fig 21 Apply grease to O Ring P 22 9 Mount O Ring P 22 9 to Head Valve A 10 then mount it to the Exhaust Cover 5 C A B Mount the Cylinder Plate 12 to the Cylinder 15 facing the stopper of the Cylinder Plate 12 to the Piston Bumper 20 When mounting to the Body 18 fit the rib of the Body 18 into the stopper groove of the Cylinder Plate 12 Figs 11...

Page 28: ...lunger Spring 58 Plunger A 59 O Ring I D 1 8 60 Valve Bushing A 61 O Ring I D 8 8 55 Valve Bushing B 53 Head Valve O Ring I D 16 8 52 Roll Pin D3 x 28 38 O Ring S 4 48 Roll Pin D3 x 28 38 a Disassembly Pull out the Roll Pin D3 x 28 38 with the roll pin puller 3 mm 0 118 dia remove the Pushing Lever Guide 40 and the Trigger 39 can be removed Trigger 39 Pushing Lever Guide 40 Fig 14 ...

Page 29: ...shing A 61 and Head Valve O Ring I D 16 8 52 CAUTIONS Be careful not to damage Valve Piston B 57 Valve Bushings A 61 and B 53 etc Do not pull out the end of Plunger A 59 with pliers 3 To take out Valve Bushing B 53 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 53 a...

Page 30: ... with the roll pin hole in the Body 18 First insert a roll pin puller 3 mm 0 118 dia into the roll pin hole Then upon confirming that the puller passes through the hole drive in the Roll Pin D3 x 28 38 If an attempt is made to drive the roll pin with force when the roll pin groove in Valve Bushing A 61 is not aligned with the roll pin hole in the Body 18 it will damage the periphery of Valve Bushi...

Page 31: ...ection a Disassembly See Fig 19 Loosen the Hex Socket Hd Bolt M5 x 20 86 and the Nylon Nut M5 69 then remove the Sleeve 70 Deform Pushing Lever Cover A 71 using a flat blade screwdriver and disengage it from the Nose 22 Loosen the Machine Screw W Washers M5 x 30 Black 37 of the Body 18 Then the Magazine Ass y 98 can be removed Engaged Deform Pushing Lever Cover A by inserting a flat blade screwdri...

Page 32: ...ctor B 72 Nylon Nut M5 69 Sleeve 70 Pushing Lever Cover A 71 Machine Screw W Washers M5 x 30 Black 37 Pin 76 Nylon Nut M5 69 Concave portion Magazine A 75 Pin 76 Magazine Cover A 78 Hex Socket Hd Bolt M5 x 20 86 Holder Cap A 79 Spring 84 Roll Pin D2 5 x 12 82 Holder Shaft A 83 Nail Holder 81 O ring P 9 62 Ratchet Spring 80 Fig 19 Disassembly and reassembly of the magazine section Fit the hole of t...

Page 33: ...he top groove of Holder Shaft A 83 When mounting Holder Shaft A 83 to Magazine A 75 check that the Spring 84 is inserted between the concave portion of Magazine A 75 and the convex portion of Holder Shaft A 83 and then insert the Pin 76 See Fig 20 Check that the Feeder Shaft Rings 77 2 pcs are securely inserted into the grooves of the Pins 76 2 pcs Be careful not to lose the Feeder Shaft Ring 77 C...

Page 34: ...ver Cover B 30 Feeder Arm B 26 Body 18 O ring S 46 13 Pushing Lever Spring 41 Pushing Lever A 31 Pushing Lever C 42 Adjuster 44 Piston Bumper 20 Feed Piston 64 O ring P 4 21 Plunger B 24 Feeder Spring 27 Feeder 28 Roll Pin D2 x 16 43 Adjuster Spring 45 Adjsuter Plate B 46 Adjsuter Plate A 47 O Ring S 4 48 Pushing Lever B 49 Retaining Ring E type for D3 Shaft 51 O ring S 5 50 O ring P 9 62 O ring P...

Page 35: ...ard Adjsuter Plate A 47 1 Disassembly and reassembly of Nose 22 Pushing Lever A 31 and other parts a Disassembly See Figs 21 and 22 Remove the four Nylock High Tension Bolts M6 x 20 23 Then the Nose 22 Pushing Lever A 31 and other parts can be removed b Reassembly Disassembly procedures should be followed in the reverse order Note the following points Apply grease to the O ring S 46 13 and mount i...

Page 36: ...Push out Plunger B 24 with a roll pin puller 4 mm dia Then the Feeder Arm B 26 Feeder 28 and Feed Spring 65 can be removed b Reassembly Disassembly procedures should be followed in the reverse order Note the following points Before replacing the Piston Bumper 20 clean the passages of the Body 18 and the Nose 22 Fig 24 and the inside of the feed piston chamber Fig 25 If clogged with fragments of th...

Page 37: ...sembly Remove the Shaft Ring 85 from the Nail Guide Shaft 29 with a flat blade screwdriver and remove the Nail Guide Shaft 29 Then the Nail Guide 89 and other parts can be removed in an assembly Remove the Nylock Hex Socket Hd Bolt M4 x 12 97 with a hex bar wrench 3 mm Then the Nail Guide Cover 94 Stopper Spring A 91 Stopper Spring B 93 and Cover 95 can be removed Remove the Shaft Ring 85 from the...

Page 38: ...6 Grip Rubber The Model NV 75AG is equipped wih the grip rubber handle that is common to the Model NR 83AA2 However the grip rubber is not supplied as a spare part because it is difficult to detach attach the grip rubber If replacement of the grip rubber is required replace the Body 18 or attach the grip tape How to attach the grip tape and the fixing tape Grip tape A Code No 881768 Fixing tape Co...

Page 39: ...k the tightening torque of each screw Check that Pushing Lever A 31 slides smoothly Check that the machine will not operate only by pulling the Trigger 39 Also check that the machine will not operate only by depressing Pushing Lever A 31 Push Nail Stopper A 90 and Nail Stopper B 92 with fingers to check that they smoothly return to position Check that the Feed Piston 64 operates properly at 5 kgf ...

Page 40: ... TIME UNIT SCHEDULES MODEL 10 20 30 40 Fixed Variable NV 75AG Work Flow Exhaust Cover Top Cover Packing B Head Bumper Head Valve Spring O ring x 2 Head Valve A 60 min 50 Cylinder Plate Cylinder Piston Bumper O ring x 3 General Assembly Feeder Arm B Feeder Feeder Spring Nose Nail Guide Nail Stopper A Nail Stopper B Guide Lock Magazine Ass y Body Feed Piston O ring x 2 Feed Spring Damper Feed Piston...

Page 41: ...14 15 16 17 18 19 13 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 38 38 39 21 501 502 503 504 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 48 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 69 75 76 77 76 78 77 79 80 81 62 82 83 84 85 86 87 88 89 90 91 92 93 85 94 95 96 97 98 62 74 84 ...

Page 42: ... NYLOCK HIGH TENSION BOLT M6X20 4 24 883 093 PLUNGER B 1 25 949 497 ROLL PIN D4X16 10 PCS 1 26 883 144 FEEDER ARM B 1 27 883 143 FEEDER SPRING 1 28 883 092 FEEDER 1 29 883 091 NAIL GUIDE SHAFT 1 30 882 900 PUSHING LEVER COVER B 1 31 883 852 PUSHING LEVER A 1 32 883 678 GASKET B 1 33 883 679 DUST FILTER 1 34 881 949 CAP 1 35 949 821 HEX SOCKET HD BOLT M5X16 10 PCS 3 36 872 035 DUST CAP 1 37 880 881...

Page 43: ...82 907 SLEEVE 1 71 883 853 PUSHING LEVER COVER A 1 72 882 901 PROTECTOR B 1 73 883 106 NOSE CAP A 1 74 878 184 WARNING LABEL 1 75 883 984 MAGAZINE A 1 76 883 111 PIN 2 77 877 826 FEEDER SHAFT RING 2 78 883 985 MAGAZINE COVER A 1 79 883 987 HOLDER CAP A 1 80 880 398 RATCHET SPRING 1 81 880 503 NAIL HOLDER 1 82 878 791 ROLL PIN D2 5X12 1 83 883 986 HOLDER SHAFT A 1 84 881 826 SPRING 1 85 880 319 SHA...

Page 44: ...M NO CODE NO DESCRIPTION REMARKS NO USED 8 02 NV 75AG STANDARD ACCESSORIES Printed in Japan 020830N 501 875 769 EYE PROTECTOR 1 502 943 277 HEX BAR WRENCH 3MM 1 503 944 458 HEX BAR WRENCH 4MM 1 504 944 459 HEX BAR WRENCH 5MM 1 ...

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