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. APPLICA TIONS..............................................................................................................................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. APPLICA TIONS
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. SPECIFICA TIONS
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 SEQUENTIAL ACTUATION MECHANISM) or CONTACT ACTUATION MECHANISM in accordance with
the work to be performed. A FULL SEQUENTIAL ACTUATION MECHANISM KIT (SEQUENTIAL TRIP
MECHANISM KIT) is also available as an option. Each nailing operation is as follows.
SINGLE ACTUATION MECHANISM (SINGLE SEQUENTIAL 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. After nailing once, nailing will not be possible again
until the trigger is released and pressed again.
CONT ACT ACTUA TION 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 SEQUENTIAL ACTUATION 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 ACTUA TION
MECHANISM
(Switching device:
upward position)
CONT ACT 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. A pressure 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/cm
2
,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/cm
2
)
(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 ft
3
/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/cm
2
)
(70 to 120 psi)
1.3 ltr/cycle
(.046 ft
3
/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/cm
2
)
(80 to 110 psi)
1.2 ltr/cycle
(.042 ft
3
/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/cm
2
)
(70 to 120 psi)
1.0 ltr/cycle
(.035 ft
3
/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/cm
2
)
(70 to 120 psi)
1.1 ltr/cycle
(.039 ft
3
/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 singleshot 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.
--- 8 ---
7-3. 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 Instruction Manual
provided with each unit.
While there are no specific safety regulations, there are related items in various general safety regulations with
which the salespersons should be familiar in order to properly advise the customer. Please check your national
and/or local regulations for applicable items.
Some applicable items are outlined below.
The U.S.A.:
OSHA
ANSI SNT-101-2002
1926.102 Eye and face protection
1926.302 Power-operated hand tools
Portable, Compressed-Air-Actuated,
Fastener Driving Tools-Safety Requirements for
8. MECHANISM AND OPERATION PRINCIPLE
8-1. Mechanism
As illustrated in Fig. 4, the Model NT 65MA2 can be generally divided into four sections: output section, control
valve section, driving section, and magazine section. The basic construction of the Model NT 65MA2 is the same
as that of the Model NT 65MA and the interchangeable components are used as much as possible. Primary
differences from the Model NT 65MA are described below.
Output section
•••••••••••••
The head valve construction was simplified and the O-ring was adopted for sliding the
piston. The grip tape wound around the grip of the body was changed to the ring-type
grip rubber. Conventional grip tape is supplied as a repair part because the grip rubber
cannot be mounted to the grip of the body by hand.
Body: Newly designed
Exhaust cover: Newly designed
Head valve (A): Common to the Model NR 65AK etc.
Piston: Newly designed
Cylinder: Newly designed
Control valve section
••••
Following parts were changed or added owing to the change of the construction
(selectable either the single actuation mechanism or the contact actuation mechanism).
Plunger (A): Common to the Model NR 90AC3
Valve piston (B): Common to the Model NR 90AC3
Valve bushing (B): Common to the Model NR 65AK etc.
Trigger (A): Common to the Model NR 90AC3
Change knob: Newly designed
Driving section and magazine section
•••••••••••••
Common to the Model NT 65MA.
--- 9 ---
Driving section
Output section
Blow nozzle section
Valve Packing [16]
Accumulator
O-Ring (1AP-3) [19]
O-Ring (S3) [20]
Spring [17]
O-Ring (S-10) [21]
Valve Bushing [22]
Plunger [18]
Top Cover [3]
Exhaust vent
Air outlet
Exhaust Cover [5]
Head Valve
(A) [10]
Accumulator
Piston [15]
(Driver blade)
Cylinder [11]
Piston
Bumper [25]
Guide Plate (B) [30]
Lock Lever [34]
Guide Plate (A) [32]
Blade Guide [38]
Pushing Lever (A) [41]
Knob [24]
Trigger (A) [52]
Body Ass’y [29]
Magazine section
Nail Feeder (B) [79]
Magazine [81]
Nail Rail [78]
Magazine
cover [70]
Nail Feeder (A) [74]
Valve Piston (B) [63]
Valve Bushing (B) [59]
Switching Device
(Change Knob [55])
Fig. 4 Construction
Control valve section
Plunger Spring [65]
Valve Bushing (A) [68]
Plunger (A) [66]
Control valve
section
Blow nozzle
section
Cap (A) [48]
Nail Stopper [80]
--- 10 ---
8-2. Interchangeability
Interchangeability of the parts between the Model NT 65MA2 and the Model NT 65MA is described below. Both
the parts that are not interchangeable and the parts that are interchangeable though their code numbers are
different are described in detail.
(1) Parts that are not interchangeable with those of the Model NT 65MA
NT 65MA2
NT 65MA
Bore diameter is concave.
Parts
Exhaust Cover [5]
Newly designed
2.1 mm (.083") dia. hole
Head Bumper [7] Common to the Model NR 65AK etc.
Head Valve Spring [8]
Common to the Model NR 65AK etc.
O-ring (P-22) [9] Common to the Model NR 65AK etc.
Head Valve (A) [10] Common to the Model NR 65AK etc.
Newly designed
Cylinder [11]
O-ring (I.D 34.7) [14] Newly designed
Newly designed
Piston [15]
O-ring type
Piston ring type
--- 11 ---
NT 65MA2
NT 65MA
7.6 mm (.299") dia. hole
Parts
Plunger [18]
Newly designed
Grip rubber
Valve Bushing [22]
Body Ass'y [29]
Steel Ball D3.97 [53]
Common to the Model NR 90AC3
Valve Bushing (B) [59]
Mark of switcning
Trigger (A) [52]
Spring (C) [54]
No notches
Newly designed
Change Knob [55]
Color: Aluminum (silver)
Notches are added (4 pcs.)
26
30.2
Newly designed
20.4 24.7
Newly designed
Grip tape
7 mm (.276") dia. hole
Common to the Model NR 90AC3
Common to the Model NR 90AC3
O-ring (S-4) [62]
Common to the Model NR 65AK etc.
Common to the Model NR 65AK etc.
Color: Black
--- 12 ---
NT 65MA2
NT 65MA
Parts
Valve Piston (B) [63]
Groove
Plunger (A) [66]
24
34.6
33.9
No groove
Common to the Model NR 90AC3
Be careful not to make mistakes in mounting
Valve Piston (B) [63] because it is similar to that
of the Models NR 90AC3 and NR 65AK.
8.8 mm (.346") dia.
O-ring groove
Color: Aluminum (silver)
Color: Black
No groove
27.5
Common to the Model NR 90AC3
Be careful not to make mistakes in mounting
Plunger (A) [66] because it is similar to that of
the Models NR 90AC3 and NR 65AK.
O-ring groove (2 pcs.)
(2) Parts that are interchangeable with those of the Model NT 65MA though their code numbers are different
Top Cover [3]
Knob [24]
Lock Lever [34]
Pushing Lever (B) [37]
Adjuster [39]
Pushing Lever (A) [41]
Pushing Lever Guide [56]
Nail Rail [78]
NT 65MA2
884332
884334
884323
884326
884325
884324
884336
884327
NT 65MA
880514
881713
881747
881749
881748
881750
880361
881753
Code No. on the Parts List
Parts
--- 13 ---
8-3. Operation Principle
(1) Before nailing: (Fig. 5 and Fig. 6)
1) When compressed air is fed to the main body, it fills
the Accumulator ( ).
2) At the same time, the compressed air flows into the
valve piston lower chamber of the control valve
section and forces Valve Piston (B) [63] upward.
Also, the compressed air is fed through the air
supply vent and air passage to the head valve
chamber. As a result, the Head Valve Spring [8] is
pushed down together to seal Head Valve (A) [10]
and Cylinder [11].
(2) When nailing: (Fig. 5 and Fig. 6)
1) When Pushing Lever (A) [41] and Trigger (A) [52]
are operated together and Plunger (A) [66] is
pushed upward, the compressed air in the valve
piston lower chamber is discharged from the bottom
of Plunger (A) [66]. As a result, the compressed air
in the accumulator ( ) pushes down Valve Piston
(B) [63], blocking 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) [10] overcomes the strength of the
Head Valve Spring [8], Head Valve (A) [10] is
pushed upward. At this time, Head Valve (A) [10]
seals with Exhaust Cover [5], blocking the passage
to the exhaust vent.
4) When Head V alve (A) [10] goes up, the compressed
air in the accumulator flows rapidly into the Cylinder
[11], forcing the Piston [15] downward to strike the
nail. When the Piston [15] passes the cylinder hole,
the compressed air flows into the return air chamber
and is accumulated there.
Fig. 5
Fig. 6 Control valve section
Exhaust Cover [5]
Exhaust vent
Head V alve
Spring [8]
Head
Valve (A) [10]
Accumulator
Piston [15]
Cylinder [11]
Return air
chamber
Pushing Lever (A) [41]
Nail
Trigger (A) [52]
Control valve
section
Air passage
Head valve chamber
To the head valve chamber
Air supply vent
Accumulator
Air passage
Exhaust valve
Valve piston
lower chamber
Plunger (A) [66]
Valve Piston (B) [63]
--- 14 ---
(3) During return: (Fig. 7 and Fig. 8)
1) When either Pushing Lever (A) [41] or Trigger (A)
[52] is released, Plunger (A) [66] goes down and the
compressed air in the accumulator flows into the
valve piston lower chamber.
2) As the air pressure in the valve piston lower chamber
increases to overcome the air pressure applied on
the upper portion of Valve Piston (B) [63], Valve
Piston (B) [63] is forced upward. When this occurs,
the exhaust valve is closed and the air supply vent is
opened.
3) When the air supply vent opens, the compressed air
in the accumulator ( ) passes through the air
passage and flows into the head valve chamber to
push down Head Valve (A) [10]. As a result, Head
Valve (A) [10] and Cylinder [11] are sealed and, at
the same time, Head Valve (A) [10] and Exhaust
Cover [5] are released to open the exhaust vent.
4) The compressed air at the upper portion of the
Piston [15] is discharged into the atmosphere
through the exhaust vent. In this way, the air
pressure at the upper portion of the Piston [15] is
reduced, and the greater pressure of the air
accumulated in the return air chamber pushes the
Piston [15] upward.
5) If the air pressure at the lower portion of the Piston
[15] is higher than that of the atmosphere after the
Piston [15] has fully returned, the excess air
pressure is discharged into the atmosphere through
the clearance between the Piston Bumper [25] and
the driver blade.
Fig. 7
Fig. 8 Control valve section
Exhaust Cover [5]
Exhaust vent
Accumulator
Head
Valve (A) [10]
Cylinder [11]
Return air
chamber
Piston [15]
Piston
Bumper [25]
Driver blade
Pushing Lever (A) [41]
Trigger (A) [52]
Control valve
section
Air passage
To the head valve chamber
Air supply vent
Accumulator
Air passage
Exhaust valve
Valve piston
lower chamber
Plunger (A) [66]
Valve Piston (B) [63]
Head valve chamber
--- 15 ---
(4) Single actuation mechanism/contact actuation mechanism: (Fig. 9 and Fig. 10)
Single/contact actuation mechanism changeover is accomplished by turning the switching device
(Change Knob [55]).
Single actuation mechanism (Switching device:
upward position):
1) Immediately after driving the first nail, the control
valve should be as shown in Fig. 8.
2) When only Pushing Lever (B) [37] is released
and Trigger (A) [52] is held as shown in Fig. 9,
the plate of Trigger (A) [52] contacts the Change
Knob [55] and Plunger (A) [66] returns (lowers)
only halfway.
Because of this, compressed air does not flow
into the valve piston lower chamber, and Valve
Piston (B) [63] remains in the lowered position.
Accordingly, the Piston [15] remains in the
lowered position as shown in Fig. 7.
3) When Trigger (A) [52] is released, Plunger (A)
[66] returns (lowers) completely as shown in
Fig. 6. Compressed air then flows into the valve
piston lower chamber, and Valve Piston (B) [63]
is forced upward. The Piston [15] then returns
fully upward. Therefore, unless Trigger (A) [52]
is released after each nailing operation, the
structural mechanism prevents the next nailing
operation.
Contact actuation mechanism (Switching device:
downward position):
1) Immediately after the first nail is driven, the
control valve should be as shown in Fig. 8.
2) Even when only Pushing Lever (B) [37] is
released and Trigger (A) [52] is held, Plunger
(A) [66] returns (lowers) completely as shown in
Fig. 10. Thus the Piston [15] returns (raises)
fully. Accordingly, continuous nailing can be
accomplished by pushing only Pushing Lever
(B) [37] up and down while holding Trigger (A)
[52] depressed.
Accumulator
Switching device (Change Knob [55])
(upward position)
Plate
Valve Piston (B) [63]
Trigger (A) [52]
Pushing Lever (B) [37]
Plunger (A) [66]
Fig. 9 Single actuation mechanism
Accumulator
Switching device (Change Knob [55])
(upward position)
Valve piston
lower chamber
Valve Piston (B) [63]
Trigger (A) [52]
Pushing Lever (B) [37]
Plunger (A) [66]
Fig. 10 Contact actuation mechanism
Valve piston
lower chamber
--- 16 ---
Replace the o-ring.
Keep the nail feeder in the
back position after pulling it
backward and release the
lock lever for idle driving.
Then, check if the driver
blade and guide plate (A)
have returned.
Magazine groove too wide
or too narrow.
Remove the abnormal nails
and load the nailer with
proper nails.
Magazine is loaded with
abnormal nails (bent nails,
abnormal collation, others).
After removing the adhesive
fragments and wood chips,
lubricate the nail rail.
<Magazine>
Nail feeder is abnormal
(burrs, deformed or
damaged).
<Nails>
Magazine is not loaded with
specified genuine nails.
Problem
Inspection method Remedy
9. TROUBLESHOOTING GUIDE
9-1. Troubleshooting and Correction
1) Nails cannot
be driven.
Check that the magazine is
correctly loaded with
specified nails.
Check the nail feeding
section for abnormal
conditions (burrs, fatigued,
deformed, damaged).
Use specified nails.
Replace the part.
Adjust the air pressure to 4.9
to 8.3 bar (5 to 8.5 kgf/cm2,
70 to 120 psi)
Ribbon spring is abnormal
(faigued or damged).
Correct the burred or
deformed portion.
Replace the part.
Replace the part.
Nail rail groove width too
wide or too narrow.
Nail groove in the blade
guide is abnormal (burrs,
deformed or damaged).
Magazine cover is abnormal
(deformed or damaged).
Adhesive fragments and
wood chips are on the
magazine, nail feeder or
nail rail.
Check if they move smoothy
after loading nails and
check if the nail feeder
operates smoothly.
Replace the part.
Correct the burred or
deformed portion.
Replace the part.
Replace the part.
Oil
Nail rail
Piston bumper is abnormal.
<Output section: piston,
driver blade, etc.
>
Air pressure is too low.
O-ring in the piston is
abnormal (worn or
damaged).
O-ring in the cylinder is
abnormal (removed,
deformed or damaged).
Driver blade is abnormal
(burrs, deformed or
damaged).
Bumper sheet is abnormal
(square hole worn, or
damaged).
Cylinder inside surface is
abnormal (packed with dust,
or worn).
Replace the piston bumper.
Reassemble or replace the
parts.
Correct or replace the parts.
Replace the parts.
Remove dust and then
lubricate.
Replace the part.
Check the nails can be
driven at 4.9 bar (5 kgf/cm2,
70 psi).
Possible cause
( : most-common cause)
--- 17 ---
< Improper nail feed >
See item "1) Magazine
section".
Cylinder inside surface is
abnormal (worn and rough).
Adjuster is incorrectly set.
Nails are not completely fed
into the injection port.
Adjust the air pressure to 4.9
to 8.3 bar (5 to 8.5 kgf/cm2,
70 to 120 psi)
Turn the adjuster to the
deepest driving position and
then drive nails.
Replace the part.
Apply grease.
Head valve (A) sliding
surface is abnormal (seized
or damaged, or lubrication is
needed.)
See item 1).
Problem
Inspection method Remedy
1) Nails cannot
be driven.
(continued)
Perform idle driving to
check the driving operation.
Perform idle driving to check
that the driver blade is not
held in the down position.
Replace the abnormal part.
Set the adjuster to the
optimum position.
Replace the part.
Head valve spring is
abnormal (fatigued or
damaged).
O-ring or sliding surface is
worn or needs lubrication.
Adjuster is raised too high
for short nails.
Check that the adjuster is
not raised too high.
Replace the abnormal part.
Apply grease.
Turn the adjuster lower
(lower the pressure).
Workpiece is too hard.
Head valve (A) sliding
surface is abnormal (seized
or damaged, or lubrication
is needed).
Nailer cannot be used
because the material is
beyond its applicable range.
Replace the part.
Regrind (see 9-2,
"Regrinding the Driver
Blade).
Replace the O-ring.
Replace the part.
Apply grease.
Disassemble the output
section and check the o-ring
and the inside of the
cylinder for abnormality.
<Control valve section >
Plunger (A), valve piston
(B), valve bushing (A) or
valve bushing (B) is
abnormal (seized or
damaged).
Disassemble the control
valve section and check the
O-rings.
2) Nails are
driven but
bent.
Unspecified nails are used.
Driver blade is worn.
See item 1).
Check that the driver blade
tip is not abnormally worn.
Replace the part.
Regrind (see 9-2,
"Regrinding the Driver
Blade").
Workpiece is too hard.
Check if a nail is bent even
when driven into soft wood.
Nailer cannot be used
because the material is
beyond its applicable range.
3) Nails cannot
be driven into
the workpiece
completely:
the heads
cannot be
made flush.
Check if a nail is bent even
when driven into soft wood.
Driver blade is worn. Perform idle driving to check
the driver blade is projected
from the nose tip.
O-ring in the piston is
abnormal (worn or damaged).
Replace the part.
Air pressure is too low.
Check the sliding surface for
abnormality and lubrication.
Unspecified nails are used.
See item "1) Magazine
section".
Check if the specified nails
are used.
Use specified nails.
Driver blade is worn.
Replace the part.
Regrind (see 9-2, "Regrinding
the Driver Blade).
4) Nails jam.
Check that the driver blade
tip is not abnormally worn.
Check if they move
smoothly after loading nails,
and check if the nail feeder
operates smoothly.
Possible cause
( : most-common cause)
--- 18 ---
O-ring in the plunger is
abnormal (removed,
deformed or damaged).
See item "1) Output section:
piston, driver blade, etc."
Reassemble or replace the
parts.
Problem
Inspection method Remedy
4) Nails jam.
(continued)
Perform idle or actual
driving to check if the driver
blade is returned
completely.
Disassemble the control
valve section, and check the
O-ring of plunger (A) and
valve piston (B).
Replace the part.
Replace the part.
Plunger (A) sliding surface
abnormal of valve piston (B)
(seized or deformed).
O-ring in plunger (A) is
worn.
Press the button of the blow
nozzle to check if it operates
smoothly.
Replace the abnormal part.
Replace the spring.
< Driver blade is not returned
completely
>
See item "1) Output section:
piston, driver blade, etc."
Check each part for
abnormalities (worn,
damaged, deformed, etc.)
6) Air keeps
blowing from
the nose of
the blow
nozzle.
O-ring in valve piston (B) is
worn.
Replace the part.
Abnormal plunger (A),
trigger arm (A), pushing
lever (B), and/or body (worn
or damaged).
The position of a switching
device is mistaken.
The position of a switching
device is checked.
A switching device is set to
the correct position.
5) Single
actuation
mechanism is
not possible.
Spring is abnormal (fatigued
or damaged).
9-2. Regrinding the Driver Blade
The tip of the driver blade should be ground as shown in Fig. 11. To grind with a grinder, gradually grind the tip
while cooling the ground area with water to prevent it from being excessively heated. Excessive grinding will
rapidly reduce the service life of the driver blade. In such a case, replace the driver blade.
Fig. 11
Driver blade
3˚ 30"
Possible cause
( : most-common cause)
--- 19 ---
The Hex. Socket Hd. bolt M5 x 20 [4]
is loose.
Gasket [6] is damaged.
The seal surface of the Body Ass'y
[29] or the Exhaust Cover [5] is
abnormal.
9-3. Possible Causes and Correction of Air Leakage
Air leakage repair location
(A) Exhaust port Head Valve (A) [10] is abnormal ( a
portion is worn, deformed or broken).
The Exhaust Cover [5] is abnormal
( a portion is deformed or clogged
with dust).
Air leakage point
Possible cause
With control valve OFF With control valve ON
(B) Exhaust cover
(A)
(B)
(C)
d
b
a
(G)
Repair procedure
(1) Check 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 and damage.
(3) And then, check other
places.
(F)
(E)
(D)
Head Valve (A) [10] and Cylinder [11]
are abnormal (seal surface of the b
portion is worn or deformed).
The O-ring (P-22) [9] is abnormal
(worn, deformed or damaged).
Head Valve (A) [10] is abnormal
(worn, deformed or damaged).
c
e
f
g
--- 20 ---
(C) Blade guide
(D) Air outlet, valve bushing
(E) Control valve (1)
(F) Control valve (2)
(G) Cap (A)
The Cylinder O-Ring (I.D 63.1) [12] is
abnormal (broken or damaged).
The seal surface of the Body Ass'y
[29] is abnormal ( c portion)
The Valve Packing [16] is damaged.
The O-Ring (1AP-3) [19] of the
Plunger [18] is abnormal (worn,
broken or damaged).
The O-Ring (S3) [20] of the Plunger
[18] is abnormal (worn, broken or
damaged).
The screw of the Valve Bushing [22]
is loose.
The O-Ring (I.D 11) [64] on Valve
Piston (B) [63] is abnormal (worn,
broken or damaged).
The lower O-ring (I.D 8.8) [61] on
Valve Piston (B) [63] is abnormal
(worn, broken or damaged).
The O-Ring (S-18) [60] on Valve
Bushing (B) [59] is abnormal (broken
or damaged).
The inside surface of the valve
chamber of the Body Ass'y [29] is
abnormal.
The O-ring (I.D 1.8) [67] on Plunger
(A) [66] is abnormal (worn, broken or
damaged).
Valve Bushing (A) [68] is abnormal
(sliding surface of Plunger (A) [66] is
deformed or scratched).
The Piston Bumper [25] is abnormal
( d or e portion is damaged,
deformed or cracked).
The Piston [15] is abnormal (driver
blade or sealed face is deformed).
The e surface of the Body Ass'y [29]
is deformed.
The upper O-Ring (I.D 8.8) [61] on
Valve Piston (B) [63] is abnormal
(worn, broken or damaged).
The Head Valve O-Ring (I.D 16.8)
[58] on Valve Bushing (B) [59] is
abnormal (broken or damaged).
* The Top surface of the valve chamber
of the Body Ass'y [29] is abnormal
( f portion).
The inside of the O-ring (S-4) [62] on
Valve Piston (B) [63] is abnormal
(worn, broken or damaged).
Plunger (A) [66] is abnormal (sliding
surface is deformed or scratched).
Air leakage point
Possible cause
With control valve OFF With control valve ON
Gasket (B) [47] is damaged.
The Hex. Socket Hd. Bolt M5 x 16 [49] is loose.
The seal surface of the Body Ass’y [29] or Cap (A) [48] is abnormal (broken,
deformed or scratched).
--- 21 ---
Tightening torque N•m (kgf•cm, ft-lb)
12.7 0.8 (130 8, 9.4 0.6)
8.3 0.5 ( 85 5, 6.1 0.4)
8.3 0.5 ( 85 5, 6.1 0.4)
2.0 0.5 ( 20 5, 1.5 0.4)
9.8 0.8 (100 8, 7.2 0.6)
10. DISASSEMBLY AND REASSEMBLY
The items particularly necessary for disassembly and reassembly are described below. The [Bold] numbers in
the descriptions below correspond to the item numbers in the Parts List and exploded assembly diagram.
[CAUTION]
Before disassembly or reassembly, be sure to disconnect the air hose from the nailer (with your
finger released from the trigger) to exhaust all the compressed air and remove all nails.
10-1. General Precautions in Disassembly and Reassembly
Apply grease (ATTOLUB No. 2) (Code No. 317918) to the O-rings and O-rings' sliding portions.
When installing the O-rings, be careful not to damage the O-rings and prevent dirt entry.
Oil required: Hitachi pneumatic tool lubricant
30 cc (1 oz) Oil feeder (Code No. 877153)
120 cc (4 oz) Oil feeder (Code No. 874042)
1 ltr (1 quart ) Can (Code No. 876212)
If the Gasket [6] 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.
Use the conventional grip tape for repair of the Grip Rubber [45] because the Grip Rubber [45] cannot be
mounted without the specifically designed jig.
Tightening torque for each part
Bolt and screw
Hex. Socket Hd. Bolt M6
•••••••••••••••••••••••••••••
[1], [31]
Hex. Socket Hd. Bolt M5
•••••••••••••••••••••••••••••
[4], [49]
Hex. Socket Hd. Bolt (W/Flange) M5
•••••••••••••••••
[76]
Machine Screw (W/Washer) M5
•••••••••••••••••••••••
[77]
Valve Bushing
•••••••••••••••••••••••••••••••••••••••••••••••••
[22]
--- 22 ---
10-2. Disassembly and Reassembly of the Output Section
(1) Disassembly and reassembly of the Exhaust Cover [5], Head Valve (A) [10], Cylinder [11], Piston [15], Piston
Bumper [25], etc. (See Fig. 12.)
Fig. 12 Disassembly and reassembly of the exhaust cover, head valve (A),
cylinder, piston, piston bumper, etc.
[Tool required]
Hex. bar wrenches (5 mm and 4 mm)
(a) Disassembly
Remove the four Hex. Socket Hd. Bolts
M5 x 20 [4] with a hex. bar wrench (4 mm)
and remove the Exhaust Cover [5].
Then the components of the output section
such as the Cylinder [11], Piston [15], Piston
Bumper [25] (with the Bumper Sheet [26]
assembled), etc. can be removed.
Remove the Hex. Socket Hd. Bolt M6 x 12 [1]
with a hex. bar wrench (5 mm). The Plate [2]
and Top Cover [3] can now be removed.
Hex. Socket Hd. Bolt
M6 x 12 [1]
Plate [2]
Top Cover [3]
Exhaust Cover [5]
Hex. Socket Hd. Bolt
M5 x 20 [4]
Gasket [6]
Head Valve Spring [8]
O-Ring (S-22) [9]
Head Valve (A) [10]
Cylinder [11]
Cylinder O-Ring
(I.D 63.1) [12]
O-Ring (P-46) [13]
Piston [15]
O-Ring (I.D 34.7) [14]
Piston Bumper [25]
Body Ass'y [29]
Bumper Sheet [26]
Head Bumper [7]
--- 23 ---
(b) Reassembly
Disassembly procedures should be followed in
the reverse order. Note the following points:
Apply grease to the inside of the Cylinder [11],
O-ring (I.D 34.7) [14] and the Cylinder O-ring
(I.D 63.1) [12] before reassembly.
Apply grease to the sliding surface a of the
Exhaust Cover [5] and Head Valve (A) [10] and
charge about 0.5 g (.018 oz) of grease in the
groove of the Exhaust Cover [5] (Fig. 13).
Apply grease to the lip portions b and c of
Head Valve (A) [10] (Fig. 13).
Apply grease to the O-ring (P-22) [9].
Mount the O-ring (P-22) [9] to Head Valve (A)
[10], then mount it to the Exhaust Cover [5].
Fig.13
O-ring (P-22) [9]
Exhaust Cover [5]
Groove of the
Exhaust Cover [5]
Head Valve (A) [10]
Fig. 14 Disassembly and reassembly of the valve bushing, plunger, etc.
a
b
c
(2) Disassembly and reassembly of the Valve Bushing [22], Plunger [18], etc. (See Fig. 14.)
[Tools required]
Socket wrench (14 mm)
Flat-blade head screwdriver
(a) Disassembly
Remove the Valve Bushing [22] with a socket wrench (14 mm ). The Valve Packing [16] and the Spring [17]
can now be removed.
Remove the Knob [24] and the Retaining Ring (E-type) for D4 Shaft [23] then the Plunger [18] can be
removed from the Valve Bushing [22].
(a) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points:
Apply grease to the O-ring (1AP-3) [19], O-ring (S3) [20] and the O-ring (S-10) [21].
Mount the Retaining Ring (E-type) for D4 Shaft [23] to the Plunger [18] then press the Knob [24] against the
Retaining Ring (E-type) for D4 Shaft [23] to mount it.
Valve Packing [16]
Spring [17]
Knob [24]
Valve Bushing [22]
O-Ring (S-10) [21]
O-Ring (S3) [20]
O-Ring (1AP-3) [19]
Plunger [18]
Retaining Ring (E-type)
for D4 Shaft [23]
Exhaust Cover [5]
--- 24 ---
[Tools required]
Flat-blade screwdriver
Roll pin puller (3 mm (.118") dia.)
Hex. bar wrench (4 mm)
10-3. Disassembly and Reassembly of the Control Valve Section (See Fig. 15.)
Retaining Ring (E-type)
for D6 Shaft [27]
Roll Pin D3 x 28 [51]
Steel Ball D3.97 [53]
Valve Bushing (B) [59]
O-Ring (S-18) [60]
O-Ring (I.D 8.8) [61]
Valve Piston (B) [63]
O-Ring (I.D 8.8) [61]
O-Ring (I.D 11) [64]
Plunger Spring [65]
Plunger (A) [66]
O-Ring (I.D 1.8) [67]
Valve Bushing (A) [68]
Fig. 15 Disassembly and reassembly of the control
valve section
Pushing Lever (B) [37]
Remove
Trigger (A) [52]
Force down
Screwdriver
Fig. 16
Plunger (A) [66]
O-Ring (S-4) [62]
Head Vavle O-ring
(I.D 16.8) [58]
Change Knob [55]
Trigger (A) [52]
Spring (C) [54]
Carefully disassemble so as
not to lose these parts.
(a) Disassembly
Remove the Retaining Ring (E-type) for D6
Shaft [27] with the blade of a screwdirver and
pull out the Change Knob [55] being careful
not to lose the Steel Ball D3.97 [53] and
Spring (C) [54]. Then Trigger (A) [52] can be
removed.
To remove Trigger (A) [52] together with the
driving section (Pushing Lever (B) [37], Blade
Guide [38], etc.), remove Trigger (A) [52]
while forcing down Plunger (A) [66] with the
blade of a screwdriver, as shown in Fig. 16.
--- 25 ---
Pull out the Roll Pin D3 x 28 [51] with the roll
pin puller (3 mm (.118") dia.), and take out the
control valve in the following manner.
1) Remove the Exhaust Cover [5] by following the
procedure in (1), section 10-2.
2) As shown in Fig. 17, put a 4 to 5 mm (.157" to
.197") dia. bar in from the upper side of the
Body Ass’y [29] and push the top of Valve
Piston (B) [63]. Now, the parts forming the
control valve can be taken out except Valve
Bushing (A) [68] and the Head Valve O-Ring
(I.D 16.8) [58].
[CAUTIONS]
Be careful not to damage Valve Piston (B) [63],
Valve Bushings (A) [68] and (B) [59], etc.
Do not pull out the end of Plunger (A) [66] with
pliers.
3) To take out Valve Bushing (B) [59], put a 1.5 to
3 mm (.059" to .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) [59], as
shown in Fig. 18.
Push
4 to 5 mm (.157" to .197") dia. bar
Body Ass’y [29]
Head Valve O-Ring
(I.D 16.8) [58]
V alve Bushing
(B) [59]
Valve Piston (B) [63]
Valve Bushing
(A) [68]
Plunger (A) [66]
Fig. 17
Valve Bushing (B) [59]
Hole
Be careful not to
damage the internal
surface.
Wire with 1.5 to 3 mm dia.
(.059" to .118")
Fig. 18
When disassembling,
do not pull out this
part by gripping it
with pliers.
--- 26 ---
(b) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points:
Be extremely careful to prevent the entry of foreign particles into the control valve section.
Thoroughly apply grease to the O-Ring (I.D 1.8) [67] on Plunger (A) [66], O-Rings (S-4) [62], (I.D 8.8) [61] and
(I.D 11) [64] on Valve Piston (B) [63], and the shaft of Plunger (A) [66] as shown in Fig. 19.
As shown in Fig. 19, install Valve Bushing (A) [68] so that the roll pin groove in Valve Bushing (A) [68] will be
aligned with the roll pin hole in the Body Ass’y [29]. First, insert a roll pin puller (3 mm (.118") dia.) into the roll
pin hole. Then, upon confirming that the puller passes through the hole, drive in the Roll Pin D3 x 28 [51].
If an attempt is made to drive the roll pin with force when the roll pin groove in Valve Bushing (A) [68] is
not aligned with the roll pin hole in the Body Ass’y [29], it will damage the periphery of Valve Bushing (A)
[68] and prevent disassembly or reassembly.
After assembling, check that Plunger (A) [66] moves smoothly.
Body Ass’y [29]
Fig. 19
Roll pin hole
Roll pin groove
Valve Bushing (A) [68]
Assemble
Roll Pin D3 x 28 [51]
Plunger (A) [66]
Valve Bushing (A) [68]
Coat the O-ring
groove's shaft with
grease.
Apply grease to the stem.
--- 27 ---
10-4. Disassembly and Reassembly of the Driving Section (See Fig. 20.)
[Tools required]
Hex. bar wrenches (4 mm and 5 mm)
Roll pin pullers (3 mm (.118") dia. and
4 mm (.157") dia.)
Flat-blade head screwdriver with small tip
(a) Disassembly
Continuously turn the Adjuster [39] in the
direction in which the nail is raised when
adjusting the driving depth (refer to
ADJUSTING THE NAILING DEPTH on
page 21 in the Instruction Manual) so that
Pushing Lever (A) [41] can be removed.
Remove the Hex. Socket Hd. Bolt (W/
Flange) M5 x 20 [76] with the hex. bar
wrench (4 mm) and remove the two Hex.
Socket Hd. Bolts M6 x 30 [31] with the
hex. bar wrench (5 mm). Now, the Blade
Guide [38], Guide Plates (A) [32] and (B)
[30], Pushing Lever (B) [37], etc. can be
removed.
Remove the two Ratchet Springs [40]
from the Adjuster [39] with the small flatblade screwdriver being very careful not to
lose them. Now, the Adjuster [39] can be
removed from Pushing Lever (B) [37].
Nylon Nut M5 [43]
Sleeve [44]
Body Ass’y [29]
Blade Guide [38]
Guide Plate
(B) [30]
Hex. Socket Hd.
Bolt M6 x 30 [31]
Guide Plate
(A) [32]
Lock Lever
[34]
Roll Pin D3 x 20 [25]
Hex. Socket Hd. Bolt
(W/Flange) M5 x 20 [76]
Roll Pin D3 x 28 [51]
Pushing Lever
Guide [56]
Roll Pin D4 x 14 [33]
Holder Spring [36]
Pushing Lever (B) [37]
Adjuster [39]
Ratchet Spring [40]
Fig. 20 Disassembly and reassembly of
the driving section
Pushing Lever (A) [41]
--- 28 ---
Pull out the Roll Pin D4 x 14 [33] with the roll pin puller (4 mm (.157") dia.) so that Guide Plate (A) [32] and
Guide Plate (B) [30] can be disassembled.
Pull out the Roll Pin D3 x 20 [35] and the two Roll Pins D3 x 28 [51] with the roll pin puller (3 mm (.118") dia.)
so that the Lock Lever [34] and Pushing Lever Guide [56] can be removed.
(b) Reassembly
Disassembly procedures should be followed in the reverse order and tighten the two Hex. Socket Hd. Bolts
M6 x 30 [31] after making the Blade Guide [38], Guide Plates (A) [32] and (B) [30] flush with the Body Ass'y
[29]. After assembly, check that Pushing Levers (A) [41], (B) [37] and the Adjuster [39] move smoothly.
10-5. Disassembly and Reassembly of the Cap and the Magazine Section
(1) Disassembly and reassembly of the cap (See Fig. 21.)
[Tool required]
Hex. bar wrench (4 mm)
(a) Disassembly
Remove the three Hex. Socket Hd. Bolts M5 x 16 [49] with the hex. bar wrench (4 mm) so that Cap (A) [48]
and Gasket (B) [47] can be removed.
(b) Reassembly
Disassembly procedures should be followed in the reverse order.
Body Ass’y [29]
Gasket (B) [47]
Cap (A) [48]
Fig. 21 Disassembly and reassembly of the cap
Hex. Socket Hd. Bolt M5 x 16 [49]
--- 29 ---
(2) Disassembly and reassembly of the magazine section (See Fig. 22.)
Nylon Nut M5 [43]
Sleeve [44]
Ribbon Spring [71]
Feeder Plate [72]
Roll Pin D2.5 x 20 [73]
Nail Feeder (A) [74]
Magazine Cover [70]
Machine Screw (W/Washer)
M5 x 16 [77]
Hex. Socket Hd. Bolt
(W/Flange) M5 x 20 [76]
Nail Rail [78]
Nail Stopper [80]
Nylon Nut M5 [43]
Magazine [81]
Nail Feeder (B) [79]
Fig. 22 Disassembly and reassembly of the magazine section
Pushing Spring [75]
[Tools required]
Phillips screwdriver
Hex. bar wrench (4 mm)
Roll pin puller (2.5 mm (.098") dia.)
(a) Disassembly
Remove the Hex. Socket Hd. Bolt (W/Flange) M5 x 20 [76] with the hex. bar wrench (4 mm) and so that the
entire magazine section can be removed and the Ribbon Spring [71], Nail Feeders (A) [74], (B) [79] and Nail
Rail [78] can be taken out.
Remove the two Machine Screws (W/Washer) M5 x 16 (Black) [77] with the Phillips screwdriver so that the
Magazine [81] and the Magazine Cover [70] can be removed.
Pull out the Roll Pin D2.5 x 20 [73] with the roll pin puller (2.5 mm (.098") dia.) so that Nail Feeder (A) [74],
Nail Feeder (B) [79] and the Pushing Spring [75] can be removed.
(b) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points:
The Hex. Socket Hd. Bolt (W/Flange) M5 x 20 [76] should be tightened while pressing the Magazine [81] and
the Magazine Cover [70] so that there will be no space between the Magazine [81] and the Blade Guide [38].
Lubricate the Nail Rail [78] and the Ribbon Spring [71] with Hitachi pneumatic tool lubricant to smooth the
movement of Nail Feeders (A) [74] and (B) [79].
--- 30 ---
11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY
Be sure to check the following items after reassembly. Pay special attention to the items (2) and (4) about the
single actuation (single sequential actuation) mechanism that is not provided to the Model NT 65MA but the
Model NT 65MA2. Before checking the following items except (5), check that no nail is loaded in the
Magazine [81] and the Blade Guide [38].
(1) Check that Pushing Levers (A) [41] and (B) [37], Trigger (A) [52], Plunger (A) [66], Change Knob [55] and
Adjuster [39] operate smoothly without connecting to an air compressor. Then check that Nail Feeders (A)
[74] and (B) [79] move smoothly in the Magazine [81].
(2) Connect the Model NT 65MA2 to an air compressor and set the Change Knob [55] to "single actuation (single
sequential actuation)" (see 5-2). Check the following when the pressure is 4.5 kgf/cm2 (63 psi) and 8.5 kgf/cm
2
(120 psi).
Check that there is no air leakage and the Model NT 65MA2 does not operate (i.e., check that the Piston
[15] does not come out of the Blade Guide [38] tip (outlet of nails) when it is left for five seconds or more).
(3) Set the Change Knob [55] to "contact actuation" (see 5-2). Check the following when the pressure is
8.5 kgf/cm2 (120 psi).
1) Check that the Model NT 65MA2 does not operate just by pulling Trigger (A) [52].
2) Check that the Model NT 65MA2 does not operate just by pressing Pushing Lever (A) [41] against a test
piece (wood etc.)
3) Check that the Model NT 65MA2 operates by pulling Trigger (A) [52] first then pressing Pushing Lever (A)
[41] against a test piece.
(4) Set the Change Knob [55] to "single actuation (single sequential actuation)" (see 5-2). Check the following
when the pressure is 8.5 kgf/cm2 (120 psi).
1) Check that the Model NT 65MA2 does not operate just by pulling Trigger (A) [52] (i.e., check that the Piston
[15] does not come out of the Blade Guide [38] tip (outlet of nails) when keeping Trigger (A) [52] pulled for
five seconds or more).
2) Check that the Model NT 65MA2 does not operate just by pressing Pushing Lever (A) [41] against a test
piece.
3) Check that the Model NT 65MA2 operates by pressing Pushing Lever (A) [41] against a test piece first then
pulling Trigger (A) [52]. Check that the Piston [15] is still showing from the Blade Guide [38] tip (outlet of
nails) after Pushing Lever (A) [41] is released from the test piece with Trigger (A) [52] pulled.
(5) Set the Change Knob [55] to "contact actuation". Set the pressure to 4.5 kgf/cm2 (63 psi) and load nails in the
Magazine [81]. Perform nailing operation and check that nails are properly driven (no idling and bent nails).
(6) Recheck the tightening torque of each screw without connecting to an air compressor.
--- 31 ---
12. STANDARD REPAIR TIME (UNIT) SCHEDULES
MODEL 10 20 30 40
Fixed
Variable
NT 65MA2
Work Flow
Knob
Plunger
O-ring x 3
Valve Bushing
60 min.
50
Top Cover
Exhaust Cover
Gasket
Head Valve
Spring
O-ring
Head Valve
Spring
General Assembly
Pushing Lever
(B)
Holder Spring
Adjuster
Pushing Lever
(A)
Piston
O-ring
Trigger (A)
Pushing Lever
Guide
Valve Bushing
(B)
Valve Piston
(B)
Plunger Spring
Plunger (A)
Valve Bushing
(A)
Head Valve
O-ring
O-ring x 6
Adjustment
(Cylinder,
Body, Valve)
Guide Plate (B)
Guide Plate (A)
Plate Guide
Magazine
Magazine Cover
Nail Feeder (A)
Nail Rail
Nail Feeder (B)
Body
Cylinder
Cylinder O-ring
O-ring
Piston Bumper
Bumper Sheet
PNEUMATIC TOOL PARTS LIST
LIST NO. E011
FINISH NAILER
Model NT 65MA2
2003 • 8 •5
(E1)
Hitachi Power Tools
10
16
17
18
19
20
21
22
23
24
14
15
25
26
27
28
29
30
31
32
33
34
35
36
37
43
44
45
46
47
48
49
50
51
52
53
55
51
56
57
58
59
60
61
62
63
61
64
65
66
67
68
69
70
71
76
77
78
79
80
81
43
72
73
74
75
38
39
40
41
42
11
12
13
1
2
3
4
5
6
8
9
7
54
501
502
503
504
505
506
*
ALTERNATIVE PARTS
--- 2 ---
ITEM
NO.
CODE NO.
DESCRIPTION REMARKS
NO.
USED
PARTS
8 -- 03
NT 65MA2
1 949-657 HEX. SOCKET HD. BOLT M6X12 (10 PCS.) 1
2 880-515 PLATE 1
3 884-332 TOP COVER 1
4 949-757 HEX. SOCKET HD. BOLT M5X20 (10 PCS.) 4
5 884-331 EXHAUST COVER 1
6 880-358 GASKET 1
7 882-914 HEAD BUMPER 1
8 882-913 HEAD VALVE SPRING 1
9 876-796 O-RING (P-22) 1
10 882-912 HEAD VALVE (A) 1
11 884-329 CYLINDER 1
12 877-312 CYLINDER O-RING (I.D 63.1) 1
13 878-716 O-RING (P-46) 1
14 882-685 O-RING (I.D 34.7) 1
15 884-330 PISTON 1
16 881-711 VALVE PACKING 1
17 881-900 SPRING 1
18 884-333 PLUNGER 1
19 873-093 O-RING (1AP-3) 1
20 881-715 O-RING (S3) 1
21 987-105 O-RING (S-10) 1
22 882-701 VALVE BUSHING 1
23 968-643
RETAINING RING (E-TYPE) FOR D4 SHAFT 1
24 884-334 KNOB 1
25 881-741 PISTON BUMPER 1
26 881-756 BUMPER SHEET 1
27 955-479
RETAINING RING (E-TYPE) FOR D6 SHAFT 1
28 884-070 WARNING LABEL 1
29 884-328 BODY ASS’Y 1 INCLUD. 45
30 881-764 GUIDE PLATE (B) 1
31 949-661 HEX. SOCKET HD. BOLT M6X30 (10 PCS.) 2
32 881-743 GUIDE PLATE (A) 1
33 949-770 ROLL PIN D4X14 (10 PCS.) 1
34 884-323 LOCK LEVER 1
35 949-685 ROLL PIN D3X20 (10 PCS.) 1
36 877-894 HOLDER SPRING 1
37 884-326 PUSHING LEVER (B) 1
38 881-742 BLADE GUIDE 1
39 884-325 ADJUSTER 1
40 881-765 RATCHET SPRING 2
41 884-324 PUSHING LEVER (A) 1
42 881-751 NOSE CAP (A) 1
43 877-371 NYLON NUT M5 3
44 881-774 SLEEVE 1
45 GRIP RUBBER 1 (SUPPLIED WITH ITEM NO. 607, 608)
46 CAUTION PLATE 1
47 881-769 GASKET (B) 1
48 881-758 CAP (A) 1
49 949-821 HEX. SOCKET HD. BOLT M5X16 (10 PCS.) 3
50 872-035 DUST CAP 1
51 949-865 ROLL PIN D3X28 (10 PCS.) 3
*
ALTERNATIVE PARTS --- 3 ---
ITEM
NO.
CODE NO.
DESCRIPTION REMARKS
NO.
USED
PARTS
8 -- 03
NT 65MA2
52 884-145 TRIGGER (A) 1
53 959-155 STEEL BALL D3.97 (10 PCS.) 1
54 982-454 SPRING (C) 1
55 884-335 CHANGE KNOB 1
56 884-336 PUSHING LEVER GUIDE 1
57 NAME PLATE 1
58 877-699 HEAD VALVE O-RING (I.D 16.8) 1
59 878-881 V ALVE BUSHING (B) 1
60 878-885 O-RING (S-18) 1
61 878-925 O-RING (I.D 8.8) 2
62 981-317 O-RING (S-4) 1
63 884-143 VALVE PISTON (B) 1
64 878-887 O-RING (I.D 11) 1
65 878-884 PLUNGER SPRING 1
66 884-144 PLUNGER (A) 1
67 878-888 O-RING (I.D 1.8) 1
68 880-671 V ALVE BUSHING (A) 1
69 LABEL 1
70 881-752 MAGAZINE COVER 1
71 881-755 RIBBON SPRING 1
72 881-745 FEEDER PLATE 1
73 881-767 ROLL PIN D2.5X20 (STAINLESS) 1
74 881-746 NAIL FEEDER (A) 1
75 880-321 PUSHING SPRING 1
76 881-773
HEX. SOCKET HD. BOLT (W/FLANGE) M5X20 1
77 881-772
MACHINE SCREW (W/WASHER) M5X16 (BLACK)
2
78 884-327 NAIL RAIL 1
79 881-744 NAIL FEEDER (B) 1
80 881-766 NAIL STOPPER 1
81 881-754 MAGAZINE 1
*
ALTERNATIVE PARTS
--- 4 ---
OPTIONAL ACCESSORIES
ITEM
NO.
CODE NO.
DESCRIPTION
REMARKS
NO.
USED
8 -- 03
STANDARD ACCESSORIES
ITEM
NO.
CODE NO.
DESCRIPTION
REMARKS
NO.
USED
NT 65MA2
Printed in Japan
(030805N)
501 944-458 HEX. BAR WRENCH 4MM 1
502 944-459 HEX. BAR WRENCH 5MM 1
503 875-769 SAFETY GLASSES 1
504 881-775 CASE 1
505 884-337 CAUTION TAG 1
506 884-120 LEAFLET 1
601 884-320
FULL SEQUENTIAL ACTUATION MECHANISM KIT
1 INCLUD. 602-606
602 884-321 TRIGGER (A) 1
603 881-778 PLUNGER (B) 1
604 878-888 O-RING (I.D 1.8) 1
605 880-672 VALVE PISTON (B) 1
606 884-322 TRIGGER PIN 1
607 881-768 GRIP TAPE (A) 1
608 880-407 TAPE 2
Loading...