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Hitachi NV 45AC, Technical Data And Service Manual

The Hitachi NV 45AC, a renowned roofing coil nailer, promises unparalleled performance. For complete knowledge of its inner workings, the Technical Data and Service Manual is a must-have. This invaluable manual is readily available for free download at manualshive.com, offering comprehensive instructions and insights to optimize your nailer's efficiency.

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PARTS

NV 45AC

: ALTERNATIVE PARTS

ITEM

NO.

CODE NO.

DESCRIPTION

NO.

USED

REMARKS

1

949-819

HEX. SOCKET HD. BOLT M5X10 (10 PCS.)

1

2

944-260

WASHER

1

3

881-841

TOP COVER

1

4

881-840

HEAD RING

1

5

883-369

PROTECTOR

1

6

883-368

HEX. SOCKET HD. BOLT M5X22

4

7

883-367

BODY GUARD

1

8

881-879

EXHAUST COVER

1

9

881-839

GASKET (A)

1

10

881-851

HEAD VALVE SPRING

1

11

877-699

HEAD VALVE O-RING (I.D 16.8)

2

12

881-837

HEAD VALVE (A)

1

13

883-365

O-RING (1BP-28)

1

14

883-364

PISTON

1

15

990-067

O-RING (1AS-50)

1

16

881-831

CYLINDER PLATE

1

17

984-483

O-RING (S-36)

1

18

881-864

CYLINDER O-RING

1

19

881-829

CYLINDER

1

20

883-366

PISTON BUMPER

1

21

883-363

BODY ASS'Y

1

INCLUD.46,47

22

955-479

RETAINING RING (E-TYPE) FOR D6 SHAFT

1

23

NAME PLATE

1

24

876-031

O-RING (S-16)

1

25

880-674

TRIGGER (A)

1

26

881-846

ADJUSTER SHAFT

1

27

881-847

LATCH

1

28

316-389

PUSHING LEVER GUIDE

1

29

881-811

NAIL GUIDE SHAFT

1

30

883-351

WASHER

1

31

873-093

O-RING (1AP-3)

1

32

883-362

GUARD

1

33

877-371

NYLON NUT M5

3

34

883-352

NOSE GUARD

1

35

993-041

NYLOCK BOLT (W/FLANGE) M6X25

2

36

883-350

NOSE

1

37

983-545

NEEDLE ROLLER

1

38

949-770

ROLL PIN D4X14 (10 PCS.)

1

39

878-132

FEEDER ARM

1

40

878-340

FEEDER SPRING

1

41

883-357

FEEDER

1

42

883-359

PUSHING LEVER (A)

1

43

949-658

HEX. SOCKET HD. BOLT M5X18 (10 PCS.)

1

44

308-386

MACHINE SCREW (W/SP. WASHER) M5X16 (BLACK)

2

45

883-361

HANDLE ARM

1

46

880-408

GRIP TAPE

1

47

880-407

TAPE

2

48

880-183

O-RING (I.D 37.2)

1

49

880-379

CAP

1

50

872-035

DUST CAP

1

51

876-205

WASHER

1

*

8 --- 00

Summary of Contents for NV 45AC

Page 1: ...POWER TOOLS TECHNICAL DATA AND SERVICE MANUAL COIL NAILER NV 45AC SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT LIST No 1098 Nov 2000 N MODEL NV 45AC ...

Page 2: ...Operation Principle 10 9 TROUBLESHOOTING GUIDE 12 9 1 Troubleshooting and Correction 12 9 2 Possible Causes and Corrections 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 22 10 4 Disassembly and Reassembly of the Driving...

Page 3: ... weighs just 1 7 kg 3 7 lbs Please expand our market share with the new Model NV 45AC The Model NV 45AC is a medium duty roofing coil nailer capable of asphalt shingles with 25 45 mm length nails after heavy duty Model NV 45AB for 22 45 mm length nails 3 APPLICATIONS Installation of asphalt roofing shingles in building construction 4 SELLING POINTS Nailing depth adjustment mechanism with an easy t...

Page 4: ...32 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 Sequential trip mechanism kit Single shot Code No 881973 Muffler Code No 881835 Shingle guide Shingle guide Code No 878175 Guide base Code No 878176 Washer Code No 949424 Plate nut Code No 878213 Hexagon socket hd bolt M5 x 16 Code No 949819 Pneumatic tool lubricant 1 oz oil ...

Page 5: ...s recommended to use genuine HITACHI nails to ensure satisfactory driving quality For nail length 22 mm 7 8 recommend the Model NV 45AB instead of this Model NV 45AC CAUTION Ensure that nails are as specified in Fig 1 Other nails will cause clogging of nails and subsequent damage to the nailer 3 05 mm 0 120 25 mm 1 Min Wire collated nails Fig 1 Dimensions of nails Max 10 5 mm 0 413 45 mm 1 3 4 3 0...

Page 6: ...nail to be fully driven For example when driving a nail of 3 05 mm dia x 45 mm length 0 120 x 1 3 4 into a workpiece of hemlock with the Model NV 45AC a pressure of about 6 9 bar 7 kgf cm2 100 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 a reference only because thos...

Page 7: ...chanism kit and also the Handling Instructions of the Model NV 45AC for correct use 2 Muffler The muffler is provided as an optional accessory for the Model NV 45AC By mounting this muffler the exhaust sound is reduced by about 10 dB A Please recommend the muffler to customers who may want to use it The muffler can be mounted according to the following procedure as shown in Fig 3 1 Remove the hex ...

Page 8: ... cycle 1 3 ltr cycle 0 046 ft 3 cycle 1 4 ltr cycle 0 049 ft 3 cycle 2 0 ltr cycle 0 070 ft 3 cycle 120 nails 120 nails 120 nails 120 nails 120 nails Bottom loading Plastic Top loading Plastic Top loading Plastic Top loading Plastic Top loading Plastic Nail capacity None Tool required None Tool not required None Provided None Provided Tool not required Tool not required Tool not required Provided ...

Page 9: ...nst 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 Instruction Manual to enhance the safe efficient use of the tool by the customer Salespersons must be thoroughly familiar wit...

Page 10: ... illustrated in Fig 4 NV 45AC can be generally divided into four sections output section control valve section driving section and magazine section Most of the parts of the above sections have been newly designed though its basic construction is the same as that of the Model NV 50AG Primary differences from the Model NV 50AG are described below Output section Most of the parts have been newly desi...

Page 11: ...eeder 41 Pushing Lever A 42 Protector 5 Control valve section Plunger Spring 61 Plunger A 62 Valve Bushing A 64 Valve Bushing B 55 Valve Piston B 59 Nail Stopper B 86 Magazine Cover 102 Nail Holder 99 Cap 49 Body Ass y 21 Nail Stopper A 84 Nail Guide 83 Guide Lock 81 Feed Piston 73 Feeder 41 Magazine Stopper 93 Magazine section Trigger A 25 Magazine 95 Driving section Output section ...

Page 12: ...g the air supply vent and opening the exhaust 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 applied on the bottom surface of Head Valve A 12 overcomes the strength of the Head Valve Spring 10 Head Valve A 12 is pushed upward At this time Head Valve A 12 seals the Exhaust Cover 8 bl...

Page 13: ...e exhaust vent 4 The compressed air at the upper portion of the Piston 14 is discharged into the atmosphere through the exhaust vent In this way the air pressure at the upper portion of the Piston 14 is reduced and the greater pressure of the air accumulated in the return air chamber pushes the Piston 14 upward 5 If the air pressure at the lower portion of the Piston 14 is higher than that of the ...

Page 14: ...c Feeder piston chamber contains foreign matter such as broken pieces of piston bumper etc Check that the magazine is correctly loaded with specified nails Check that the driving section is not abnormal burrs deformed damaged or worn Remove the feed piston and check the feed piston sliding surface of the nose Check that nails are correctly loaded in the groove of the nose Open the nail guide and p...

Page 15: ...rn deformed damaged etc Check the operation of nail stopper A and nail stopper B Tighten screws and check the O rings Replace the O rings Apply grease or lubricate Correct or replace the parts Remove dust and then lubricate Replace the abnormal parts Collate the nails correctly and reload the nailer with them Remove burrs or deformed part Replace the parts Adjust the height of the nail holder corr...

Page 16: ...form idle driving to check that the driver blade is not held in the down position Remove dust and then lubricate Replace the part Replace the part Apply grease Replace the part Replace the abnormal part Replace the abnormal part Apply grease Turn the adjuster lower lower the pressure See item 1 Replace the part Nailer cannot be used because the material is beyond its applicable range Set the adjus...

Page 17: ... or collation pitch 3 Nails cannot be driven into the workpiece completely the heads cannot be made flush continued Perform idle driving to check the driver blade is projected from the nose tip Disassemble the output section and check the O ring and the inside of the cylinder for abnormality Disassemble the cylinder plate and check for abnormality Check the sliding surface for abnormality and lubr...

Page 18: ...r blade etc Air pressure is too high 4 Nails jam continued Open the nail guide and check the position of the feeder claw Check that the feeder claw holds a nail and the first nail is positioned in the injection port Check that the second claw holds the nail shaft and feeds it See item 1 Nail guide section Perform idle or actual driving to check if the driver blade is returned completely Nails may ...

Page 19: ...k 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 B e f g d c b h E E D C C F G a A Exhaust port Head Valve A 12 and Cylinder 19 are abnormal seal surface of the b portion is worn or deformed The Head Valve O ring 11 is abnormal worn deformed or damaged Head...

Page 20: ...rmal e or f portion is damaged deformed or cracked The Piston 14 is abnormal driver blade or sealed face is deformed The f surface of the Body Ass y 21 is deformed The O Ring P 18 74 on the Feed Piston 73 is abnormal worn broken or damaged or the Nose 36 is worn deformed or scratched on the sliding surface The O Ring P 9 72 in the Nose 36 is abnormal worn broken or damaged or the Feed Piston 73 is...

Page 21: ...o 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 9 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 s...

Page 22: ...9 before reassembly Mount the Cylinder Plate 16 aligning the triangle mark with the mark on the Body Ass y 21 as shown in Fig 10 Mount the Gasket A 9 aligning the 6 mm 0 236 dia hole with the blowhole of the Body Ass y 21 10 2 Disassembly and Reassembly of the Output Section See Fig 9 Hex Socket Hd Bolt M5 x 10 1 Washer 2 Head Value Spring 10 Gasket A 9 Exhaust Cover 8 Body Guard 7 Protector 5 Hea...

Page 23: ...g 11 Apply grease to the Head Valve O Ring I D 16 8 11 Mount the Head Valve O Ring I D 16 8 11 to Head Valve A 12 then mount it to the Exhaust Cover 8 Fit the convex portion of the Exhaust Cover 8 in the concave portion of the Top Cover 3 Fig 11 Top Cover 3 Groove of the Exhaust Cover 8 Head Valve O Ring I D 16 8 11 Head Valve A 12 Concave portion of the Top Cover 3 Convex portion of the Exhaust C...

Page 24: ...ogether with the driving section Pushing Lever B 70 the Nose 36 etc remove Trigger A 25 while forcing down Plunger A 62 with the blade of a screwdriver as shown in Fig 13 Retaining Ring E Type for D6 Shaft 22 O Ring S 18 56 Body Ass y 21 O Ring S 4 58 Valve Piston B 59 Plunger Spring 61 Plunger A 62 O Ring I D 1 8 63 Valve Bushing A 64 Trigger A 25 O Ring I D 8 8 57 Valve Bushing B 55 Head Valve O...

Page 25: ...ing A 64 and the Head Valve O Ring I D 16 8 11 CAUTIONS Be careful not to damage Valve Piston B 59 Valve Bushings A 64 and B 55 etc Do not pull out the end of Plunger A 62 with pliers 3 To take out Valve Bushing B 55 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 55...

Page 26: ...ll pin hole in the Body Ass y 21 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 18 52 If an attempt is made to drive the roll pin with force when the roll pin groove in Valve Bushing A 64 is not aligned with the roll pin hole in the Body Ass y 21 it will damage the periphery of Valve Bushi...

Page 27: ...73 O Ring P 18 74 Spring 75 Bumper 76 Feed Piston Cover 77 Magazine Bushing 79 Adjuster Shaft 26 Latch 27 Pushing Lever Guide 28 Spring 69 Pushing Lever B 70 Washer 30 Nose Guard 34 Guard 32 Nylon Nut M5 33 Nylock Bolt W Flange M6 x 25 35 Machine Screw W Sp Washer M5 x 16 Black 44 Body Ass y 21 Adjuster Spring 66 Nose 36 Feeder Arm 39 Pushing Lever A 42 Feeder 41 Feeder Spring 40 Needle Roller 37 ...

Page 28: ...e 28 securely as shown in Fig 18 After reassembly check that Pushing Lever A 42 operates smoothly 2 Disassembly and reassembly of the adjuster section See Fig 17 a Disassembly Remove the Pushing Lever Guide 28 by following the procedure in 1 section 10 4 Pull out the Roll Pin D1 6 x 12 67 with a roll pin puller 1 5 mm 0 059 dia Then the Adjuster Knob 68 the Adjuster Spring 66 the Bolt Washer M4 65...

Page 29: ...ved b Reassembly Disassembly procedures should be followed in the reverse order Note the following points Before reassembly remove foreign matter such as broken pieces of the Piston Bumper 20 from the passage between the Body Ass y 21 and the Nose 36 Fig 21 and the feed piston chamber Fig 22 completely for smooth operation of the Feed Piston 73 Fig 19 Fig 20 Mount the Adjuster Knob 68 in this orie...

Page 30: ...pers A 84 Spring 85 Guide Lock 81 a Disassembly Remove the Nose 36 by following the procedure in 1 section 10 4 Put a roll pin puller 3 mm 0 118 dia through the 3 mm 0 118 hole in the Nose 36 and pull out the Nail Guide Shaft 29 Then the Nail Guide 83 and other parts can be removed in an assembly state Holding the Nail Guide Cover 87 with a finger to prevent jumping of the Springs 82 and 85 remove...

Page 31: ...assembly The Cap 49 has an M42 mm screw portion Hold the two flat portions of the Cap 49 with a wrench 23 mm and turn the Cap 49 to remove it b Reassembly Disassembly procedures should be followed in the reverse order Apply grease to the O Ring I D 37 2 48 before reassembly Cap 49 O Ring I D 37 2 48 Body Ass y 21 Fig 24 Disassembly and reassembly of the cap ...

Page 32: ... M5 x 16 Black 44 Magazine Cover 102 Sleeve 101 Hex Socket Hd Bolt M5 x 12 100 Nail Holder 99 Holder Spring 98 Washer 97 Machine Screw M4 x 40 96 Magazine 95 Retaining Ring E Type for D3 Shaft 89 Stopper Pin 94 Nylon Nut M5 33 Magazine Stopper 93 Stopper Spring 92 Hinge Pin 90 Retaining Ring E Type for D3 Shaft 89 Nylon Nut M4 104 Magazine Guard 103 U Nut M5 105 Fig 25 Disassembly and reassembly o...

Page 33: ... 4 Disassembly and reassembly of the Magazine Cover 102 See Fig 25 a Disassembly Insert the tip of a flatblade screwdriver in the clearance between the Magazine 95 and the Magazine Cover 102 and remove the Retaining Ring E Type for D3 Shaft 89 Push out the Hinge Pin 90 by using a roll pin puller 3 mm 0 118 dia Then the Magazine Cover 102 and other parts can be removed in an assemble state b Reasse...

Page 34: ...2 63 psi check that there is no idle driving and bending of nails Note Before conducting the driving test turn the Adjuster Knob 68 to the deepest position Recheck the tightening torque of each screw Check that Pushing Lever A 42 slides smoothly Check that the machine will not operate only by pulling Trigger A 25 Also check that the machine will not operate only by depressing Pushing Lever A 42 ...

Page 35: ...er Top Cover Gasket A Head Valve Spring Head Valve O Ring Head Valve A Piston O Ring 60 min 50 Cylinder Plate Cylinder Piston Bumper O Ring x 2 Cylinder O Ring Valve Bushing A Plunger A Plunger Spring Valve Piston B Valve Bushing B O Ring x 7 Feeder Arm Feeder Feeder Spring General Assembly Trigger Pin Adjustment Cylinder Body and Valve Nose Nail Guide Nail Stopper A B Guide Lock Nail Guide Cover ...

Page 36: ... 34 COIL NAILER Model NV 45AC 2000 8 25 E1 LIST NO 1098 PNEUMATIC TOOL PARTS LIST ...

Page 37: ...Y ASS Y 1 INCLUD 46 47 22 955 479 RETAINING RING E TYPE FOR D6 SHAFT 1 23 NAME PLATE 1 24 876 031 O RING S 16 1 25 880 674 TRIGGER A 1 26 881 846 ADJUSTER SHAFT 1 27 881 847 LATCH 1 28 316 389 PUSHING LEVER GUIDE 1 29 881 811 NAIL GUIDE SHAFT 1 30 883 351 WASHER 1 31 873 093 O RING 1AP 3 1 32 883 362 GUARD 1 33 877 371 NYLON NUT M5 3 34 883 352 NOSE GUARD 1 35 993 041 NYLOCK BOLT W FLANGE M6X25 2 ...

Page 38: ...EED PISTON 1 74 873 570 O RING P 18 1 75 880 409 SPRING 1 76 877 476 BUMPER 1 77 880 170 FEED PISTON COVER 1 78 983 748 RETAINING RING FOR D24 HOLE 1 79 880 177 MAGAZINE BUSHING 1 80 874 436 O RING P 4 1 81 878 103 GUIDE LOCK 1 82 880 446 SPRING 1 83 883 353 NAIL GUIDE 1 84 883 354 NAIL STOPPER A 1 85 880 393 SPRING 2 86 883 355 NAIL STOPPER B 1 87 883 356 NAIL GUIDE COVER 1 88 880 830 NYLOCK HEX ...

Page 39: ...Y 1 INCLUD 89 105 501 944 459 HEX BAR WRENCH 5MM 1 502 944 458 HEX BAR WRENCH 4MM 1 503 875 769 EYE PROTECTOR 1 504 882 414 LEAFLET 1 505 881 976 CAUTION TAG 1 601 881 973 SEQUENTIAL TRIP MECHANISM SET 1 602 881 835 MUFFLER 1 8 00 Printed in Japan 000825 N STANDARD ACCESSORIES ITEM NO CODE NO DESCRIPTION NO USED REMARKS OPTIONAL ACCESSORIES ITEM NO CODE NO DESCRIPTION NO USED REMARKS ...

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