Hitachi NV 50AG2 Technical Data And Service Manual
TECHNICAL DATA
AND
SERVICE MANUAL
COIL NAILER
NV 50AG2
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No.: E020 Jan. 2005
N
MODEL
NV 50AG2
Hitachi
Power Tools
CONTENTS
Page
1. PRODUCT NAME ............................................................................................................................ 1
2. MARKETING OBJECTIVE .............................................................................................................. 1
3. APPLICATIONS ............................................................................................................................... 1
4. SELLING POINTS ........................................................................................................................... 1
4-1. Selling Point Descriptions ................................................................................................................ 2
5. SPECIFICATIONS ........................................................................................................................... 4
5-1. Specifications ....................................................................................................................................4
5-2. Nail Selection ....................................................................................................................................5
5-3. Nail Driving Force .............................................................................................................................7
5-4. Air Consumption ............................................................................................................................... 8
5-5. Optional Accessory ...........................................................................................................................8
6. PRECAUTIONS IN SALES PROMOTION ...................................................................................... 9
6-1. Safety Instructions ............................................................................................................................9
6-2. Related Laws and Regulations .......................................................................................................10
6-3. Precautions in Sales Promotion ...................................................................................................... 10
7. MECHANISM AND OPERATION PRINCIPLE ...............................................................................11
7-1. Mechanism ..................................................................................................................................... 11
7-2. Operation Principle .........................................................................................................................12
8. TROUBLESHOOTING................................................................................................................... 14
8-1. Troubleshooting and Correction......................................................................................................14
8-2. Possible Causes and Corrections for Air Leakage ......................................................................... 19
9. DISASSEMBLY AND REASSEMBLY ........................................................................................... 21
9-1. General Precautions in Disassembly and Reassembly ..................................................................21
9-2. Disassembly and Reassembly of the Output Section .....................................................................22
9-3. Disassembly and Reassembly of the Control Valve Section ..........................................................24
9-4. Disassembly and Reassembly of the Cap and the Magazine Section ...........................................27
9-5. Disassembly and Reassembly of Nail Feeder Section ...................................................................28
10. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ................................................... 31
11. STANDARD REPAIR TIME (UNIT) SCHEDULES ....................................................................... 32
Assembly Diagram for NV 50AG2
--- 1 ---
1. PRODUCT NAME
Hitachi Coil Nailer, Model NV 50AG2
2. MARKETING OBJECTIVE
The Model NV 50AG2 is a coil nailer specifically designed for driving nails into plaster boards. It can drive nails of
50 mm (2") in length into plaster boards, and it is equipped with convenient functions such as the vertical nailing
guide mechanism.
3. APPLICATIONS
Installation of plaster board and similar materials in interior construction.
4. SELLING POINTS
Lightweight
1.4 kg (3.1 lbs.)
One-touch 360û exhaust direction control
Ergonomically-designed grip
Change knob for 2-model drive control:
Continuous shot and single shot modes
Nailing-depth
adjustment mechanism
Vertical nailing guide mechanism
Nails can be driven straight and
the nail heads are flush.
--- 2 ---
4-1. Selling Point Descriptions
(1) Vertical nailing guide mechanism
When installing plaster board with a nailer, it is important that nails be driven flush so that the finished surface
is smooth. The nails must be driven as straight as possible so that the heads are even and the paper covering
of the plaster board is not damaged. As illustrated below, the Model NV 50AG2, equipped with a unique
vertical nailing guide mechanism, drives nails more vertically into the surface of plaster board than is possible
with conventional nailers.
Conventional nailer mechanism Model NV 50AG2 mechanism
Plaster board
Nail is inclined
inside nail output
guide.
Nail is driven in
inclined condition.
Vertical nailing
guide mechanism
Paper covering of
plaster board is
damaged.
Nail head is uneven
(not flush).
Nail angle is
corrected to
vertical.
Nail is driven
vertically.
Excellent finish
with minimal paper
damage and nail
head uneveness.
--- 3 ---
Flush
Too shallow
(Turn the adjuster
to the deep side.)
(2) Nailing-depth adjustment mechanism
The nail-driving depth can be adjusted by turning the adjuster in the Model NV 50AG2. Be sure to adjust both
the air pressure used and the adjuster.
Turn the adjuster to the deepest point.
Set the air pressure used to 4.9 bar (5 kgf/cm2, 70 psi) as a guide.
Carry out test driving. If the nail depth is too deep, turn the adjuster to the shallow side.
If the nail depth is too shallow, adjust the air pressure used to the higher.
Too deep
(Turn the
adjuster to the
shallow side.)
Deep
Shallow
Adjuster
--- 4 ---
Sequential fire parts set (Code No. 881012)
Pneumatic tool lubricant (30 cc (1 oz) oil feeder) (Code No. 877153)
Pneumatic tool lubricant (120 cc (4 oz) oil feeder) (Code No. 872042)
Pneumatic tool lubricant (1 ltr (1 quart) can) (Code No. 876212)
Grease (ATTOLUB No. 2) (500 g (1.1 lbs.)) (Code No. 317918)
5. SPECIFICATIONS
5-1. Specifications
Model
Driving system
Applicable air pressure
Driving speed
Product weight
Main body dimensions
(Length x Height x Width)
Nail feed system
Loadable number of nails
Air consumption
Air inlet
Packaging
Package dimensions
(Length x Height x Width)
Standard accessories
Optional accessories
NV 50AG2
Reciprocating piston type
4.9 --- 8.3 bar (5 --- 8.5 kgf/cm2, 70 --- 120 psi) (Gauge pressure)
3 pcs./sec
1.4 kg (3.1 lbs)
243 mm (L) x 288 mm (H) x 125 mm (W)
(9-9/16" x 11-11/32" x 4-15/16")
Reciprocating piston type
0.80 liter/cycle at 6.9 bar
(0.80 liter/cycle at 7 kgf/cm2)
(0.28 ft3/cycle at 100 psi)
NPT 3/8 thread
Corrugated cardboard box (Sleeve type)
400 mm (L) x 165 mm (H) x 355 mm (W)
(15-3/4" x 6-1/2" x 14")
Safety glasses (Code No. 875769)
••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
Hexagon bar wrench for M4 screw (Code No. 943277)
•••••••••••••••••••••••••
1
Hexagon bar wrench for M5 screw (Code No. 944458)
•••••••••••••••••••••••••
1
Hexagon bar wrench for M6 screw (Code No. 944459)
••••••••• •••••••••••••••
1
Case (Code No. 880444)
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
Oiler (30 cc) (Code No. 877153)
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
200 nails
--- 5 ---
Min.
Max.
Fig. 1 Dimensions of nails
5-2. Nail Selection
Choose a suitable nail from Fig. 1 "Dimensions of nails". Nails which are not shown in Fig. 1 "Dimensions of
nails" cannot be driven with this tool.
Nails are collated and coiled as shown in Fig. 2.
NOTE: There are nails very similar to those illustrated below in local markets. However, since dimensions
other than those shown will cause jamming, faulty nail feeding, and/or damage to the tool
mechanism, it is important that the customer be cautioned to ensure that only Hitachi approved
nails are utilized.
7.0 mm
(.273")
7.0 mm
(.273")
2.5 mm
(.098")
2.3 mm
(.091")
32 mm (1-1/4")
45 mm (1-3/4")
7.0 mm
(.273")
2.3 mm
(.091")
50 mm (2")
--- 6 ---
L
D
1
32 --- 45
(1-1/4" --- 1-3/4")
118
(4.646)
Unit: mm (inch)
dD
2
H
2.39 --- 2.5
(.091" --- .098")
52
(2.047)
20
(.787)
The nail connecting dimensions and coil sizes after winding are shown below.
Sheet-collated nails
Fig. 2 Collated and coiled nails
--- 7 ---
5-3. Nail Driving Force
When the Model NV 50AG2 is used with 2.3 mm dia. x 50 mm (.091" x 2") length smooth nails to fasten two
sheets of plaster board (9 mm (3/8") in thickness) onto a soft wood material, approximately 5.9 bar (6 kgf/cm2,
85 psi) of air pressure will drive the nails so that the nail heads become flush with the surface of the outer sheet of
plaster board.
However, while the above figures may be utilized as a handy reference, actual air pressure requirements will vary
in accordance with the type, moisture content and grain of the wood material, and other variable factors.
Fig. 3 Required nailing energy and nailer output energy
Required nailing energy
Graph is based on use of smooth nails.
Required energy for screw nails is
approximately 1.2 times larger.
Nailer output energy
Output energy shown is based on maximum
nailing depth adjustment.
12 mm
(1/2")
9 mm
(3/8")
9 mm
(3/8")
2.3 mm x 40 mm
(0.091" x 1-9/16")
2.3 mm x 50 mm
(0.091" x 2")
NV 50AG2
--- 8 ---
5-5. Optional Accessory
Sequential fire parts set:
The sequential fire parts set is provided as an optional accessory for the Model NV 50AG2. By using this optional
accessory, a nail is driven by pressing the push lever first against a workpiece and then pulling the trigger, and no
nail is driven when pulling the trigger first and then pressing the push lever against a workpiece (single-shot
operation). Please recommend the sequential fire parts set to the customers who want to use it. Salespersons
must instruct the customers to read the Handling Instructions attached to the sequential fire parts set and also the
Handling Instructions of the Model NV 50AG2 thoroughly for correct use.
5-4. Air Consumption
Based on actual tests, Fig. 4 illustrates the amount of air consumed in driving a single nail.
Fig. 4 Air consumption in driving one nail
Applied air pressure
Air consumption
(Equivalent atmospheric pressure)
--- 9 ---
6. PRECAUTIONS IN SALES PROMOTION
6-1. Safety Instructions
In the interest of promoting the safest and most efficient use of the Model NV 50AG2 Nailer by all of our
customers, it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously
recognizes the importance of the contents of the Handling Instructions, and fully understands the meaning of the
precautions listed on the Warning Label attached to each tool.
(1) Handling Instructions
Although every effort is made in each step of design, manufacture and inspection to provide protection against
safety hazards, the dangers inherent in the use of any pneumatic tool cannot be completely eliminated.
Accordingly, specific precautions and suggestions for the use of the pneumatic nailer are listed in the Handling
Instructions to enhance the safe and efficient use of the tool by the customer. Salespersons must be
thoroughly familiar with the contents of the Handling Instructions to be able to offer appropriate guidance to the
customer during sales promotion.
(2) Warning Label
Each Model NV 50AG2 unit is provided with a Warning Label (illustrated below) which lists basic safety
precautions in its use. Carefully ensure that the customer fully understands and follows these precautions
before using the tool.
GEFAHR Vor Gebrauch die BETRIEBSANLEITUNG LESEN. Ein Nichtbeachten
der Betriebsanleitung KANN ZU ERNSTHAFTEN VERLETZUNGEN FÜHREN.
Anwender und andere Personen, die sich im Arbeitsbereich aufhalten, MÜSSEN
DIE ERFORDERLICHEN SCHUTZBRILLEN TRAGEN.
NIEMALS FLASCHENGASE BENUTZEN. Ausschließlich regulierte Druckluft benutzen.
ÜBERSCHREITEN SIE NIEMALS 120 psi/8.3 bar. TRAGEN SIE DIE MASCHINE
NIEMALS MIT DEM FINGER AM SCHALTER. Vor Service-und Reparaturarbeiten,
sowie wenn das Gerät nicht benutzt wird, DRUCKSCHLAUCH ABKLEMMEN.
DANGER LISEZ LE MANUEL D'UTILISATION avant usage. VOUS POUVEZ
VOUS BLESSER GRAVEMENT en ne suivant pas les instructions. L'opérateur ainsi
que toute personne à aproximité DOIT PORTER DES LUNETTES DE SECURITE
AGREES. NE JAMAIS UTILISER DU GAZ EMBOUTEILLE. Utiliser uniquement de
l'air règlé. NE PAS DEPASSER 12 psi/8.3 bar. NE JAMAIS PORTER AVEC LE
DOIGT SUR LA GACHETTE. DEBRANCHEZ L'AIR avant de commencer l'entretien,
le règlade ou avant d'arrêter le travail.
C316007
--- 10 ---
6-2. Related Laws and Regulations
As nailers and staplers are designed to instantaneously drive nails and staples, there is an ever-present danger of
misfiring and subsequent possible serious injury. Accordingly, close attention in handling is absolutely necessary
at all times. Carefully ensure that the customer is fully aware of the precautions listed in the Handling Instructions
provided with each unit.
While there are no specific safety regulations, there are related items various general safety regulations with
which the salespersons should be familiar in order to advise the customer properly. Please check your national
and/or local regulations for applicable items.
Some applicable items are outlined below.
(1) Europe
EUROPEAN STANDARD EN792-13 JUNE 2000
HAND-HELD NON-ELECTRIC POWER TOOLS---SAFETY REQUIREMENTS
Part 13: Fastener driving tools
(2) The U.S.A.
OSHA 1926.102 Eye and Face Protection
1926.302 Power-Operated Hand Tools
ANSI SNT-101-2002 Portable, Compressed-Air-Actuated,
Fastener Driving Tools---Safety Requirements for
6-3. Precautions in Sales Promotion
The salespersons must instruct customers to observe the following precautions.
(1) An air pressure less than 4.4 bar (4.5 kgf/cm2, 63 psi) or more than 7.8 bar (8 kgf/cm2, 112 psi) can affect the
performance, service life and safety of the Model NV 50AG2. Pay special attention to the pressure level,
capacity and piping of the air compressor. [If using an air compressor capable of high air pressure [9.8 bar
(10 kgf/cm2, 140 psi) or more], be sure to install a pressure reducing valve on the air compressor and limit the
pressure to 7.8 bar (8 kgf/cm2, 112 psi) or less].
(2) To protect the Model NV 50AG2 against rust, apply oil and perform idle driving two or three times to spread the
applied oil fully inside this nailer when it is not used for a long time. Also coat the steel parts with oil.
(3) Rust inside this nailer can cause performance degradation or failure. The salespersons must instruct the
customers to drain the air compressor tank without fail.
(4) The salespersons must instruct the customers, especially those who use the Model NV 50AG2 frequently, to
check and maintain this nailer without fail.
(5) The salespersons must instruct the customers to clean and apply the provided oil to the sliding sections of the
pushing lever regularly.
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