Hitachi NT 65MA2 Manual

TECHNICAL DATA
AND
SERVICE MANUAL
FINISH NAILER
NT 65MA2
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No. E011 Aug. 2003
N
MODEL
NT 65MA2
Hitachi 
Power Tools

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 SFN40
R
BOSTITCH N62FN
Q
PORTER CABLE DA250B
P
DEWALT D51275
S

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. Explanation of the Nailing Operation ............................................................................................. 3
5-3. Nail Selection................................................................................................................................. 4
5-4. Examples of Nail Use .................................................................................................................... 4
5-5. Nail Driving Force .......................................................................................................................... 5
5-6. Optional Accessories ..................................................................................................................... 5
6. COMPARISONS WITH SIMILAR PRODUCTS ..............................................................................6
7. PRECAUTIONS IN SALES PROMOTION .....................................................................................7
7-1. Instruction Manual ......................................................................................................................... 7
7-2. Warning Label................................................................................................................................ 7
7-3. Related Laws and Regulations ...................................................................................................... 8
8. MECHANISM AND OPERATION PRINCIPLE ...............................................................................8
8-1. Mechanism .................................................................................................................................... 8
8-2. Interchangeability......................................................................................................................... 10
8-3. Operation Principle ...................................................................................................................... 13
9. TROUBLESHOOTING GUIDE .....................................................................................................16
9-1. Troubleshooting and Correction................................................................................................... 16
9-2. Regrinding the Driver Blade......................................................................................................... 18
9-3. Possible Causes and Correction of Air Leakage ......................................................................... 19
10. DISASSEMBLY AND REASSEMBLY ........................................................................................21
10-1. General Precautions in Disassembly and Reassembly ............................................................. 21
10-2. Disassembly and Reassembly of the Output Section................................................................ 22
10-3. Disassembly and Reassembly of the Control Valve Section ..................................................... 24
10-4. Disassembly and Reassembly of the Driving Section ............................................................... 27
10-5. Disassembly and Reassembly of the Cap and the Magazine Section ...................................... 28
11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ..................................................30
12. STANDARD REPAIR TIME (UNIT) SCHEDULES .....................................................................31
Assembly Diagram for NT 65MA2

--- 1 ---
1. PRODUCT NAME
Hitachi 2-1/2" Finish Nailer, Model NT 65MA2
2. MARKETING OBJECTIVE
The new Model NT 65MA2 finish nailer is a minor-changed version of the current Model NT 65MA. Owing to the
modification of the ANSI standard, the valve construction was changed. In addition, the head valve construction
was simplified and the O-ring was adopted for sliding the piston to respond to market prices of finish nailers in the
U.S.A.
Primary differences from the Model NT 65MA are described below.
(1) Equipped with the switching device at the valve. The nailer operation is selectable between "single actuation
(single sequential actuation) mechanism" and "contact actuation mechanism" (the current Model NT 65MA is
provided with the contact actuation mechanism only).
(2) Equipped with the same head valve of solid rubber as the Model NR 65AK (the current Model NT 65MA is
equipped with the head valve made of plastic and rubber).
(3) Equipped with the O-ring for sliding the piston (the current Model NT 65MA is equipped with the piston ring).
3. APPLICATIONS
For manufactured housing, on-site and mobile home construction:
Mounting of light and heavy trim
Installation of molding, paneling and stairways
Assembling of window and door casings
For cabinet-making, furniture-making and woodworking
4. SELLING POINTS
Simple drive-
depth adjusting
mechanism
With "single actuation/
contact actuation" selector
Grip rubber
Capable of cleaning chips and
sawdust of course it drives nails
thanks to the blow nozzle
Exhaust direction easily
changeable
Easy-to-use clogged nail
release mechanism

--- 2 ---
5. SPECIFICATIONS
5-1. Specifications
NT 65MA2
Driving system
Operating pressure
Driving speed
Weight
Dimensions
(Length x Height x Width)
Nail feed system
Nail capacity
Air consumption
Air inlet
Packaging
Packaging dimensions
(Length x Height x Width)
Standard accessories
Optional accessories
Reciprocating piston type
4.9 --- 8.3 bar (5 --- 8.5 kgf/cm2, 70 --- 120 psi) (Gauge pressure)
3 pcs./sec
2.0 kg (4.4 lbs.)
344 mm x 304 mm x 82 mm
(13-17/32" x 11-31/32" x 3-7/32")
Ribbon spring
100 nails
1.20 ltr/cycle at 6.9 bar
(1.20 ltr/cycle at 7 kgf/cm2)
(.042 ft3/cycle at 100 psi)
3/8 NPT thread
Corrugated cardboard box (Sleeve type)
430 mm x 380 mm x 113 mm
(16-15/16" x 14-15/32" x 4-7/16")
Safety glasses (Code No. 875769) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••1
Hex. bar wrench for M5 screw (Code No. 944458) ••••••••••••••••••••••••••••••••••••••••••••• 1
Hex. bar wrench for M6 screw (Code No. 944459) ••••••••••••••••••••••••••••••••••••••••••••• 1
Case (Code No. 881775) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Nose cap (A) (Code No. 881751) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Full sequential actuation mechanism kit (Code No. 884320)
(Sequential trip mechanism kit)
Pneumatic tool lubricant (30 cc (1 oz) oil feeder) (Code No. 877153)
Pneumatic tool lubricant (120 cc (4 oz) oil feeder) (Code No. 874042)
Pneumatic tool lubricant (1 ltr (1 quart) can) (Code No. 876212)
Grease (ATTOLUB No. 2) (500 g (1.1 lbs)) (Code No. 317918)
Model

--- 3 ---
5-2. Explanation of the Nailing Operation
To meet the requirements of "ANSI SNT-101-2002", the Model NT 65MA2 is equipped with a nailing operation
switching device at the valve section as shown in the figures below. Use SINGLE ACTUATION MECHANISM
(SINGLE SEQUENTIALACTUATION MECHANISM) or CONTACT ACTUATION MECHANISM in accordance with
the work to be performed. A FULL SEQUENTIALACTUATION MECHANISM KIT (SEQUENTIAL TRIP
MECHANISM KIT) is also available as an option. Each nailing operation is as follows.
SINGLE ACTUATION MECHANISM (SINGLE SEQUENTIALACTUATION MECHANISM):
First, press the push lever against the wood; next, pull the trigger to drive the nail. First, pull the trigger; next,
press the push lever against the wood to drive the nail. After nailing once, nailing will not be possible again
until the trigger is released and pressed again.
CONTACT ACTUATION MECHANISM:
First, press the push lever against the wood; next, pull the trigger to drive the nail. First, pull the trigger; next,
press the push lever against the wood to drive the nail. If the trigger is held back, a nail will be driven each
time the push lever is pressed against the wood.
FULL SEQUENTIALACTUATION MECHANISM:
First, press the push lever against the wood; next, pull the trigger to drive the nail. Follow the same sequence
to continue driving nails.
Nailing operation switching device
SINGLE ACTUATION
MECHANISM
(Switching device:
upward position)
CONTACT ACTUATION
MECHANISM
(Switching device:
downward position)
Switching device
(Change knob) Switching device (Change knob)

--- 4 ---
5-3. Nail Selection
The Model NT 65MA2 utilizes small-head, T-shaped nails (finish nails) collated by tapes. Applicable nails are
shown below.
CAUTION: Ensure that nails are as specified in Fig. 1. Other nails will cause clogging of nails and
subsequent damage to the nailer.
15-gauge finish nail (collating angle 34˚)
Min. Max.
2.4 mm (.095")
34˚
Fig. 1 Dimensions of nails
1.8 mm (.072")
32 mm
(1 -1/4") 3.0 mm
(.12" )
1.1 mm
(.045")
2.4 mm (.095")
1.8 mm (.072")
65 mm (2 -1/2")
3.0 mm
(.12")
1.1 mm
(.045")
Tapes
5-4. Examples of Nail Use
Examples of uses for the nails shown in 5-2 for
installing finish materials, or molding as shown in Fig. 2.
Typical mounting methods are shown in circles A and B.
A: Crown molding B: Base molding
Fig. 2 Examples of molding

--- 5 ---
5-5. Nail Driving Force
Figure 3 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 1.8 mm dia. x 65 mm length (.072" x 2-1/2") into six sheets of 12 mm (.472") plywood
(72 mm (2-27/32") thick) with the Model NT 65MA2, a pressure of about 6.3 bar (6.4 kgf/cm2, 91 psi) allows the
nailer to drive the nail flush with the wood surface. Apressure beyond this value causes the nail head to be driven
below the wood surface. Figure 3 should be used as a reference only because those values vary depending on
the type of wood, moisture content, and grain of wood.
Required nailing energy Nailer output energy
P
S
NT 65MA
NT 65MA2
R
Q
Plywood
(12 mm (.472") thick) x 6
Fig. 3 Required nailing energy and nailer output energy
5-6. Optional Accessories
Full sequential actuation mechanism kit (sequential trip mechanism kit) (Code No. 884320)
A full sequential actuation mechanism kit (sequential trip mechanism kit) is provided as an optional accessory for
the Model NT 65MA2. 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 full sequential actuation
mechanism kit (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 full sequential actuation mechanism kit (sequential
trip mechanism kit) and also the Handling Instructions of the Model NT 65MA2 thoroughly for correct use.

--- 6 ---
Maker HITACHI
Air consumption at 6.9
bar (7 kgf/cm2,100 psi)
Operating pressure
Magazine type
Weight
Dimensions
(L x H x W)
Nail capacity
Jam-release
Driving depth
adjustment mechanism
Applicable
nails Dia.
Collating
angle
4.9 to 8.3 bar
(5 to 8.5 kgf/cm2)
(70 to 120 psi)
344 mm x 304 mm x 82 mm
(13-17/32" x 11-31/32" x 3-7/32")
NT 65MA2
1.2 ltr/cycle
(.042 ft3/cycle)
100 nails
Rear loading type
Angle: 34˚
2.0 kg (4.4 lbs.)
Single-touch operation by hand
Horizontal dial
2.4 mm to 3.0 mm
(.095" to .12")
34˚
4.9 to 8.3 bar
(5 to 8.5 kgf/cm2)
(70 to 120 psi)
1.3 ltr/cycle
(.046 ft3/cycle)
100 nails
Rear loading type
Angle: 34˚
2.0 kg (4.4 lbs.)
P
6. COMPARISONS WITH SIMILAR PRODUCTS
Nailing operation
switching device
Easily changeable 360˚
by turning by hand
Easily changeable 360˚
by turning by hand
Model name NT 65MA
Blow nozzle
Provided None
Provided
Direction change of
exhaust air
Handle grip Rubber Racket grip
Length 32 mm to 65 mm
(1-1/4" to 2-1/2")
344 mm x 305 mm x 82 mm
(13-17/32" x 12" x 3-7/32")
349 mm x 301 mm x 85 mm
(13-3/4" x 11-27/32" x 3-11/32")
None
None
Single-touch operation
by hand
Horizontal dial
Rubber
34˚
2.4 mm to 3.0 mm
(.095" to .12")
32 mm to 65 mm
(1-1/4" to 2-1/2")
5.4 to 7.6 bar
(5.5 to 7.7 kgf/cm2)
(80 to 110 psi)
1.2 ltr/cycle
(.042 ft3/cycle)
100 nails
Rear loading type
Angle: 26˚
2.2 kg (4.8 lbs.)
R
Only 4 directions by
90˚each by replacing
the piece
334 mm x 287 mm x 90 mm
(13-5/32" x 11-5/16" x 3-17/32")
None
None
Single-touch operation
by hand
Horizontal dial
Hook and loop tape type
26˚
2.4 mm to 3.0 mm
(.095" to .12")
32 mm to 65 mm
(1-1/4" to 2-1/2")
4.9 to 8.3 bar
(5 to 8.5 kgf/cm2)
(70 to 120 psi)
1.0 ltr/cycle
(.035 ft3/cycle)
110 nails
Rear loading type
Angle: 34˚
1.9 kg (4.1 lbs.)
S
Easily changeable 360˚
by turning by hand
323 mm x 298 mm x 94 mm
(12-23/32" x 11-3/4" x 3-11/16")
None
None
Single-touch operation
by hand
Vertical slide
Rubber
34˚
2.4 mm to 3.0 mm
(.095" to .12")
25 mm to 65 mm
(1" to 2-1/2")
4.9 to 8.3 bar
(5 to 8.5 kgf/cm2)
(70 to 120 psi)
1.1 ltr/cycle
(.039 ft3/cycle)
129 nails
Rear loading type
Angle: 34˚
1.7 kg (3.7 lbs.)
Q
Easily changeable 360˚
by turning by hand
378 mm x 298 mm x 83 mm
(14-7/8" x 11-3/4" x 3-9/32")
None
None
Single-touch operation
by hand
Horizontal dial
Rubber
34˚
2.4 mm to 3.0 mm
(.095" to .12")
32 mm to 65 mm
(1-1/4" to 2-1/2")

--- 7 ---
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Model NT 65MA2 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.
The Model NT 65MA2 Nailer is selectable between single actuation mechanism (single sequential actuation
mechanism) and contact actuation mechanism (however, some of the Model NT 65MA2 are designed for single-
shot operation only for some destinations). At time of sale, the salesperson must inform the customer that the full
sequential actuation mechanism kit (sequential trip mechanism kit) which can change the Model NT 65MA2 to a
single-shot nailer is optionally available, and recommend it to the customers who want to use it. Refer to the
leaflet attached together with the Instruction Manual for details.
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 NT 65MA2 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.