Hitachi NR 65AK User manual

STRIP NAILER
NR 65AK
LIST No. 1099 Sep. 2001
POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
N
MODEL
NR 65AK

Notice for use
Specifications and parts are subject to change for improvement.
Refer to Hitachi Power Tool Technical News for further information.

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
PASLODE 5250/65SPP
Y
SENCO SN60MC
R

Page
CONTENTS
1. PRODUCT NAME..................................................................................................................1
2. MARKETING OBJECTIVE ....................................................................................................1
3. APPLICATIONS .....................................................................................................................1
4. SELLING POINTS .................................................................................................................1
5. SPECIFICATIONS .................................................................................................................2
5-1. Specifications........................................................................................................................ 2
5-2. Nail Selection ........................................................................................................................ 3
5-3. Nail Driving Force ................................................................................................................. 4
6. COMPARISONS WITH SIMILAR PRODUCTS .....................................................................5
7. PRECAUTIONS IN SALES PROMOTION ............................................................................6
7-1. Instruction Manual ............................................................................................................... 6
7-2. Warning Label ....................................................................................................................... 6
7-3. Related Laws and Regulations ............................................................................................. 7
8. MECHANISM AND OPERATION PRINCIPLE ......................................................................7
8-1. Mechanism ........................................................................................................................... 7
8-2. New Mechanism ................................................................................................................. 10
8-3. Operation Principle ............................................................................................................. 14
9. TROUBLESHOOTING GUIDE ............................................................................................16
9-1. Troubleshooting and Correction.......................................................................................... 16
9-2. Possible Causes and Corrections of Air Leakage............................................................... 20
10. DISASSEMBLYAND 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 Reassembly of the Driving Section ...................................................... 28
10-5. Disassembly and Reassembly of the Cap and the Magazine Section ............................. 31
11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY.........................................36
12. STANDARD REPAIR TIME (UNIT) SCHEDULES ............................................................37
Assembly Diagram for NR 65AK

--- 1 ---
1. PRODUCT NAME
Hitachi 2-1/2" Strip Nailer, Model NR 65AK
2. MARKETING OBJECTIVE
There is an increasing demand for the metal hardware used for framing work to resist earthquakes and
hurricanes. Although competitors have already put their nailers specifically designed for the metal hardware, they
do not meet the market requirements sufficiently because they are reputed as "low strength", "trouble-prone",
and "large and heavy". The new Model NR 65AK strip nailer clears the above problems and features the
following:
1. Compact and lightweight (2.9 kg)
2. New-type pushing lever is adopted:
(1) Easy to aim at the desired nailing position
(2) No need of lever shifting operation
(3) High strength
3. Easy to drive nails at corners thanks to the short center height
4. Easy to adjust nail lengths
The new nails specifically designed for the Model NR 65AK are also provided (refer to page 3). The Model NR
65AK has already been registered under the trade name of "STRAP TITE" as a strip nailer specifically designed
for the metal hardware.
3. APPLICATIONS
Metal hardware with pre-punched holes to wood stud installation only (straps, joint hangers, framing anchors).
4. SELLING POINTS
Exhaust direction easily
changeable
Aluminum magazine
Racket grip for comfort and
temperature protection
Lightweight 2.9 kg (6.4 lbs.) for easy one-handed operation
38 mm
(1-1/2")
Short center height
Nail gate is easily
adjustable to the nail
lengths.
Well-balanced design locating
its center of gravity at the handle
Easy to aim at the desired
nailing position
No need of lever shifting
operation
High strength
New-type pushing lever

--- 2 ---
Optional accessories
Nail capacity
2.9 kg (6.4 lbs.)
1.8 ltr/cycle at 6.9 bar (1.8 ltr/cycle at 7 kgf/cm2) (0.063 ft3/cycle at 100 psi)
Corrugated cardboard box
2 nails/sec.
Driving speed
448 mm x 335 mm x 85 mm
(17-5/8" x 13-3/16" x 3-3/8")
44 nails (2 strips)
Dimensions
(Length x Height x Width)
Nail feed system
3/8 NPT thread
Standard accessories
Weight
Spiral spring
Air consumption
Air inlet
Package dimensions
(Length x Height x Width)
Packaging
476 mm x 383 mm x 132 mm
(18-3/4" x 15" x 5-7/32")
Eye protector (Code No. 875769) .............................................................. 1
Hex. bar wrench for M5 screw (Code No. 944459) .................................... 1
Hex. bar wrench for M4 screw (Code No. 944458) .................................... 1
Hex. bar wrench for M3 screw (Code No. 943277) .................................... 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) (Code No. 876212)
5. SPECIFICATIONS
5-1. Specifications
Reciprocating piston type
Model
Driving system
NR 65AK
Operating pressure 5.4 --- 8.3 bar (5.5 --- 8.5 kgf/cm2, 80 --- 120 psi) (Gauge pressure)

--- 3 ---
5-2. Nail Selection
The Model NR 65AK utilizes heat treated round-head nails collated with paper into bands of 22 pieces.
Applicable nail dimensions are shown below. However, it is recommended to use genuine HITACHI nails to
ensure satisfactory driving quality.
WARNING
Use only genuine HITACHI heat treated nails for this NR 65AK to avoid serious injury from ricocheting
nails. The use of any other nails and non-heat treated nails could result in dangerous tool malfunction
and/or nail malfunction, causing serious injury.
Select adequate nail size to meet proper metal hardware requirement needed for application, designed
by metal hardware manufacturer and regulated by the applicable building code.
CAUTION: Ensure that nails are as specified in Fig. 1. Other nails will cause jamming of nails and
subsequent damage to the nailer.
280"
(7.1 mm)
1-1/2" (38 mm)
Min.
Fig. 1 Dimensions of nails
Max.
280"
(7.1 mm)
2-1/2" (64 mm)
.162"
(4.1 mm)
(8d) .131 x 1-1/2" (3.3 x 38 mm)
(10d) .148 x 1-1/2" (3.8 x 38 mm)
(10d) .148 x 2-1/2" (3.8 x 64 mm)
(16d) .162 x 2-1/2" (4.1 x 64 mm)
Paper-collated strip nails
Full-head nails
.131"
(3.3 mm)

--- 4 ---
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 required nailing energy for driving the nail allows the nail to be fully driven.
For example, when driving a nail of 3.3 mm dia. x 38 mm length (0.131" x 1-1/2") into a workpiece of hemlock with
the Model NR 65AK, a pressure of about 5.5 bar (5.7 kgf/cm2, 80 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 those values vary depending on the type of wood, moisture
content, and grain of wood.
Fig. 2 Required nailing energy and nailer output energy
Air pressure setting to drive nail flush with NR 65AK
Hemlock
HITACHI NR 65AK
Y
R
3.3 x 38 mm (0.131" x 1-1/2")
3.8 x 38 mm (0.148" x 1-1/2")
3.8 x 64 mm (0.148" x 2-1/2")
4.1 x 64 mm (0.162" x 2-1/2")
200 250100 150 (mm
2
)
0.15 0.2 0.25 0.3 0.35 0.4 (in
2
)
80
60
40
20
1000
800
600
400
200
100
80
60
40
20
80
60
40
20
1000
800
600
400
200
100
80
60
40
20
Required nailing energy Nailer output energy

--- 5 ---
7.8 mm
2.6 mm
(.1")
Handle grip
Shank dia.
Applicable
nails
Head dia.
Collation
Length 38 mm -- 64 mm
(1-1/2" -- 2-1/2")
Racket grip
(Comfortable grip)
Paper
7.1 mm (.28")
3.3 mm -- 4.1 mm
(.131" -- .162")
Rubber
(Not elastic)
Paper
3.3 mm -- 4.1 mm
(.131" -- .162")
Rubber
(Not elastic)
Paper
7.1 mm (.28")
3.3 mm -- 4.1 mm
(.131" -- .162")
38 mm -- 64 mm
(1-1/2" -- 2-1/2")
7.1 mm (.28")
38 mm -- 64 mm
(1-1/2" -- 2-1/2")
6. COMPARISONS WITH SIMILAR PRODUCTS
Maker HITACHI
Air consumption at 6.9
bar (7 kgf/cm2, 100 psi)
Operating pressure
Center height
Direction change of
exhaust air
Magazine type
(Material)
Tool-less
(360 deg)
Weight
Dimensions
(L x H x W)
Method of locate
Change nail length
The center of gravity
5.4 --- 8.3 bar
(5.5 --- 8.5 kgf/cm2)
(80 --- 120 psi)
448 mm x 335 mm x 85 mm
(17-5/8" x 13-3/16" x 3-3/8")
Model name NR 65AK
1.8 ltr/cycle
(0.63 ft3/cycle)
44 nails
(2 strips)
Rear loading
(Aluminum)
Nail capacity
Nail point
2.9 kg (6.4 lbs.)
Adjust the nail gate
Located at the
handle for good
balance (Fig. 3)
38 mm
(1-1/2")
465 mm x 346 mm x 114 mm
(18-5/16" x 13-5/8" x 4-1/2")
365 mm x 330 mm x 111 mm
(14-1/2" x 13" x 4-3/8")
5.4 --- 8.3 bar
(5.5 --- 8.5 kgf/cm2)
(80 --- 120 psi)
5.4 --- 8.3 bar
(5.5 --- 8.5 kgf/cm2)
(80 --- 120 psi)
2.5 ltr/cycle
(0.88 ft3/cycle) 2.2 ltr/cycle (0.77 ft3/cycle)
Top loading
(Plastic) Rear loading
(Aluminum)
None None
Probe Nail point
Turn the lever
(Fig. 4)
Change position of
the nail rail
(Fig. 5)
4.1 kg (9 lbs.) 3.6 kg (7.7 lbs.)
Fig.3
Driver blade shape
Center height
The center of gravity
10.8 mm
(.42")
7.8 mm
(.3")
5.8 mm
(.23")
(.3")
5.5 mm
(.21")
Fig.4
Probe
The lever
Fig.5
The nail rail
44 --- 48 nails
(2 strips) 30 nails (1 strip)
60 mm
(2-3/8") 51 mm
(2")
YR
Nail gate

--- 6 ---
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Model NR 65 AK 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 Instruction Manual, and fully understands the meaning of the precautions
listed on the Warning Label attached to each tool.
7-1. Instruction Manual
Although every effort is made in each step of the 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, 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 with the contents of the Instruction Manual to be able to offer
appropriate guidance to the customers during sales promotion.
7-2. Warning Label
Each Model NR 65AK unit is provided with a Warning Label (illustrated below) which lists basic safety precautions
in its use. Carefully ensure that customers fully understand and follow these precautions before using the tool.