Hitachi NV 83A2 Manual

COIL NAILER
NV 83A2
LIST No. E007 Oct. 2002
POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
N
MODEL
NV 83A2

REMARK:
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:
Symbols Utilized Competitors
Company Name Model Name
SENCO SCN65
R
PASLODE P350C
Y
BOSTITCH N80CB
P

Page
CONTENTS
1. PRODUCT NAME.....................................................................................................................1
2. MARKETING OBJECTIVE .......................................................................................................1
3. APPLICATIONS........................................................................................................................1
4. SELLING POINTS ....................................................................................................................1
5. SPECIFICATIONS ....................................................................................................................3
5-1. Specifications........................................................................................................................... 3
5-2. Nail Selection........................................................................................................................... 4
5-3. Nail Driving Force .................................................................................................................... 5
5-4. Optional Accessories ............................................................................................................... 6
6. COMPARISONS WITH SIMILAR PRODUCTS ........................................................................7
7. PRECAUTIONS IN SALES PROMOTION ...............................................................................8
7-1. Instruction Manual ................................................................................................................... 8
7-2. Warning Label.......................................................................................................................... 8
7-3. Related Laws and Regulations ................................................................................................ 9
7-4. Precautions in Operation ......................................................................................................... 9
8. MECHANISM AND OPERATION PRINCIPLE .......................................................................10
8-1. Mechanism ............................................................................................................................ 10
8-2. Interchangeability of Parts ......................................................................................................11
8-3. Operation Principle ................................................................................................................ 13
9. TROUBLESHOOTING GUIDE ...............................................................................................17
9-1. Troubleshooting and Correction.............................................................................................17
9-2. Possible Causes and Corrections of Air Leakage.................................................................. 22
10. DISASSEMBLY AND REASSEMBLY ..................................................................................25
10-1. General Precautions in Disassembly and Reassembly ....................................................... 25
10-2. Disassembly and Reassembly of the Output Section.......................................................... 26
10-3. Disassembly and Reassembly of the Control Valve Section ............................................... 28
10-4. Disassembly and Reassembly of the Magazine Section ..................................................... 29
10-5. Disassembly and Reassembly of the Driving Section ......................................................... 32
10-6. Grip Rubber ......................................................................................................................... 36
11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ............................................37
12. STANDARD REPAIR TIME (UNIT) SCHEDULES ...............................................................38
Assembly Diagram for NV 83A2

--- 1 ---
1. PRODUCT NAME
Hitachi 83 mm Coil Nailer, Model NV 83A2
2. MARKETING OBJECTIVE
The current Model NV 83A is a well-reputed 3-1/4 coil nailer suitable for framing works. However, the coil nailer
market is becoming increasingly competitive. The newly introduced Model NV 83A2 is developed by making
minor changes to the current Model NV 83A to meet the market demands.
The output section is common to that of the Model NV 83A featuring good driving response. In addition, the
Model NV 83A2 is equipped with a tool-less nailing depth adjuster, pop-out magazine, non-slip rubber, etc. to
meet the market demands. Applicable nails are the same as those of the Model NV 83A. The Model NV 83A2
weighs only 3.7 kg (same as the Model NV 83A).
3. APPLICATIONS
Construction of wooden work such as floor and wall framing, roof decking and subflooring
Mobile and modular home construction
Making wooden boxes, palletes, and drums
Packing operations in manufacturing plants, and other types of packing and crating work in general
4. SELLING POINTS
Grip rubber
Tool-less adjuster
Easy top load
pop-out magazine
Quick driving 2-valve cylinder drive system

--- 2 ---
(1) Output section
The basic construction is the same as that of the Model NV 83A except the 2-valve cylinder drive system that
is well reputed for quick driving is adopted.
(2) Adjuster
While the Model NV 83A requires a wrench to adjust the nailing depth, the Model NV 83A2 requires no tool for
adjustment. Amount of adjustment is about 4.5 mm (0.177").
(3) Magazine
While the Model NV 83A is equipped with a bottom loading magazine, the Model NV 83A2 is equipped with
the "pop-out magazine" that allows easy nail loading from the top of the magazine thanks to the tilting nail
holder. The magazine can be opened/closed just by the nail guide operation. (The Model NV 83A requires
operation of both the nail guide and the latch at the rear of the magazine.)
(4) Handle grip
Thanks to the adoption of the grip rubber that is common to the Model NR 83AA2, the handle grip of the Model
NV 83A2 is more durable than that of the Model NV 83A.
Too shallowFlush Too deep
Shallow Deep
Adjuster

--- 3 ---
Optional accessories
Nail capacity
3.7 kg (8.2 lbs.)
2.4 ltr/cycle at 7 kgf/cm2(.085 ft3/cycle at 100 psi) (2.4 ltr/cycle at 6.9 bar)
Corrugated cardboard box
290 mm x 348 mm x 135 mm
(11-13/32" x 13-11/16" x 5-13/32")
200 --- 300 nails (1 coil)
Dimensions
(Length x height x width)
Nail feed system
3/8 NPT thread
Standard accessories
Weight
Reciprocating piston type
Air consumption
Air inlet
Package dimensions
(Length x height x width)
Packaging
396 mm x 143 mm x 366 mm
(15-19/32" x 5-5/8" x 12-39/64")
Hex. bar wrench for M5 screw (Code No. 944458) .................................... 1
Hex. bar wrench for M6 screw (Code No. 944459) .................................... 1
Hex. bar wrench for M8 screw (Code No. 872422) .................................... 1
Eye protection (Code No. 875769) ............................................................. 1
Sequential trip mechanism kit (single-shot) (Code No. 876762)
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)
5. SPECIFICATIONS
5-1. Specifications
Reciprocating piston type
Model
Driving system
NV 83A2
Operating pressure 5 --- 8.5 kgf/cm2(70 --- 120 psi, 4.9 --- 8.3 bar) (Gauge pressure)
Min. 3 pcs./sec.
Driving speed

--- 4 ---
5-2. Nail Selection
The Model NV 83A2 utilizes common round-head nails collated by wire or sheet into coils from 200 to 300 pieces.
Applicable nail dimensions are shown below. However, it is recommended to use genuine HITACHI nails to
ensure satisfactory driving quality.
CAUTION: Ensure that nails are as specified in Fig. 1. 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.
6 mm
(.236")
50 mm (2")
Min.
Fig. 1 Dimensions of nails
Max.
7.2 mm
(.283")
2.5 mm
(.099") 3.3 mm (.131")
Wire-collated nails
83 mm (3-1/4")

--- 5 ---
5-3. Nail Driving Force
Fig. 2 shows by type of wood and nail, the nailer output energy provided by the supply pressure and the nailing
energy required for driving the nail flush. Air pressure which exceeds the intersecting point between the nailer
output energy and the nailing energy required for driving the nail allows the nail to be fully driven.
For example, when driving a nail of 3.3 mm dia. by 83 mm length (0.131" x 3-1/4") into nine sheets of 12 mm
plywood (108 mm thick) with the Model NV 83A2, a pressure of about 7.0 bar (7.1 kgf/cm2, 102 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 reference data because those values vary depending on the
type, moisture content, and grain of wood.
Fig. 2 Required nailing energy and nailer output energy
NV 83A2 NV 83A, R, P
NV 83A2
Y

--- 6 ---
5-4. Optional Accessories
Sequential trip mechanism kit (Single shot) (Code No. 876762)
A sequential trip mechanism kit is provided as an optional accessory for the Model NV 83A2. By using this
optional accessory, a nail is driven by pressing the pushing lever first against a workpiece and then pulling the
trigger (single-shot operation), and no nail is driven when pulling the trigger first and then pressing the pushing
lever against a workpiece. Please recommend the sequential trip mechanism kit to the customers who want to
use it. Salespersons must instruct the customers to read the Handling Instructions attached to the sequential trip
mechanism kit and also the Handling Instructions of the Model NV 83A2 thoroughly for correct use.

--- 7 ---
6. COMPARISONS WITH SIMILAR PRODUCTS
Maker
Air consumption
at 7 kgf/cm2(100 psi)
Operating pressure
Trigger valve
Driving depth
adjustment mechanism
Magazine type
(Material)
Tool not required
Weight
Dimensions
(L x H x W)
4.9 ---8.3 bar
(5 ---8.5 kgf/cm
2
)
(70 ---120 psi)
290 mm x 348 mm x 135 mm
(11-13/32" x 13-11/16" x 5-13/32")
HITACHI
2.2 ltr/cycle
(0.078 ft3/cycle)
200
---
300 nails
Top loading
(Plastic)
Nail capacity
8.2 lbs. (3.7 kg)
2-valve
Length
Applicable
nails Shank dia.
Collation
50 mm -- 83 mm
(2" -- 3-1/4")
2.5 mm -- 3.3 mm
(0.098" -- 0.120")
Wire
Model name NV 83A2
Handle grip Rubber
With wrench
4.9 ---8.3 bar
(5 ---8.5 kgf/cm
2
)
(70 ---120 psi)
290 mm x 348 mm x 135 mm
(11-13/32" x 13-11/16" x 5-13/32")
2.2 ltr/cycle
(0.078 ft3/cycle)
200
---
300 nails
Bottom loading
(Plastic)
8.2 lbs. (3.7 kg)
2-valve
50 mm -- 83 mm
(2" -- 3-1/4")
2.5 mm -- 3.3 mm
(0.098" -- 0.120")
Wire
NV 83A
Racket grip
None
4.9 ---6.9 bar
(5 ---7 kgf/cm
2
)
(70 ---100 psi)
306 mm x 330 mm x 141 mm
(12-3/64" x 13" x 5-35/64")
2.6 ltr/cycle
(0.093 ft3/cycle)
225
---
300 nails
Top loading
(Plastic)
8.4 lbs. (3.8 kg)
1-valve
38 mm -- 83 mm
(1-1/2" -- 3-1/4")
2.5 mm -- 3.8 mm
(0.098" -- 0.150")
Wire
P
Rubber
Tool required
4.9 ---8.3 bar
(5 ---8.5 kgf/cm
2
)
(70 ---120 psi)
330 mm x 325 mm x 132 mm
(13" x 9-51/64" x 5-13/64")
2.7 ltr/cycle
(0.096 ft3/cycle)
225
---
275 nails
Top loading
(Plastic)
8.4 lbs. (3.8 kg)
1-valve
38 mm -- 83 mm
(1-1/2" -- 3-1/4")
2.5 mm -- 3.3 mm
(0.098" -- 0.120")
Wire
Y
Rubber
Tool not required
4.9 ---8.3 bar
(5 ---8.5 kgf/cm
2
)
(70 ---120 psi)
327 mm x 359 mm x 111 mm
(12-7/8" x 10-9/64" x 4-3/8")
2.5 ltr/cycle
(0.089 ft3/cycle)
225
---
275 nails
Top loading
(Plastic)
8.2 lbs. (3.7 kg)
1-valve
50 mm -- 90 mm
(2" -- 3-1/2")
2.5 mm -- 3.3 mm
(0.098" -- 0.120")
Wire
R
Rubber