Hitachi NT 65M2 (S) Manual

TECHNICAL DATA
AND
SERVICE MANUAL
FINISH NAILER
NT 65M2
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No. E032 Dec. 2005
N
MODEL
NT 65M2
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
Porter Cable FN250B
P
Bostitch SB-1664FN
Q

CONTENTS
Page
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 .................................................................................................................................. 2
5-3. Explanation of the Nailing Action .................................................................................................... 3
5-4. Nail Driving Force ........................................................................................................................... 4
6. COMPARISONS WITH SIMILAR PRODUCTS .............................................................................. 5
7. PRECAUTIONS IN SALES PROMOTION ..................................................................................... 6
7-1. Handling Instructions ...................................................................................................................... 6
7-2. Warning Label ................................................................................................................................. 6
7-3. Related Laws and Regulations ....................................................................................................... 7
8. MECHANISM AND OPERATION PRINCIPLE ............................................................................... 8
8-1. Mechanism ..................................................................................................................................... 8
8-2. Operation Principle ....................................................................................................................... 10
9. TROUBLESHOOTING GUIDE ..................................................................................................... 13
9-1. Troubleshooting and Correction .................................................................................................... 13
9-2. Regrinding the Driver Blade .......................................................................................................... 16
9-3. Possible Causes and Countermeasures for Air Leakage ............................................................. 17
10. DISASSEMBLY AND REASSEMBLY ........................................................................................ 19
10-1. General Precautions in Disassembly and Reassembly .............................................................. 19
10-2. Disassembly and Reassembly of the Output Section ................................................................. 20
10-3. Disassembly and Reassembly of the Control Valve Section ...................................................... 22
10-4. Disassembly and Reassembly of the Driving Section ................................................................ 25
10-5. Disassembly and Reassembly of the Cap and the Magazine Section ....................................... 26
11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY .................................................. 28
12. STANDARD REPAIR TIME (UNIT) SCHEDULES ..................................................................... 29
Assembly Diagram for NT 65M2

--- 1 ---
1. PRODUCT NAME
Hitachi Finish Nailer, Model NT 65M2
2. MARKETING OBJECTIVE
The new Model NT 65M2 finish nailer is a minor-changed version of the current Model NT 65M. To expand the
market share, the Model NT 65M2 is shifted from OEM to manufacturing by ourselves. In addition, the
appearance is changed to the one for a next-generation model (Model NR 90AD).
3. APPLICATIONS
Finish-nailing of door casings and similar frame assemblies.
Fastening of drawer bottoms and similar assembly work in the construction of various cabinets and cases.
4. SELLING POINTS
360ûadjustable exhaust
Tool-less depth adjustment
Capable of cleaning chips
and saw dust of course it
drives nails thanks to the
blow nozzle
With "single actuation/
contact actuation" selector
Easy-to-use clogged nail
release mechanism
Lightweight, only 1.7 kg (3.7 lbs.)
and good balance
New aggressive appearance
Comfortable grip

--- 2 ---
Optional accessories
Loadable number of nails
1.7 kg (3.7 lbs.)
Corrugated cardboard box
295 mm x 285 mm x 71 mm (11-5/8" x 11-7/32" x 2-51/64")
100 nails
Dimensions (L x H x W)
Nail feed system
Standard accessories
Product weight
Ribbon spring
Packing dimensions (L x H x W)
Packing
385 mm x 355 mm x 120 mm (15-5/32" x 14-125/128" x 4-23/32")
Safety glasses (Code No. 885549) ........................................................... 1
Case (Code No. 885676) .......................................................................... 1
Nose cap (mounted on tool) (Code No. 881751) ...................................... 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 oz oil feeder) (Code No. 876212)
Grease (ATTOLUB No. 2) (500 g (1.1 lbs.)) (Code No. 317918)
5. SPECIFICATIONS
5-1. Specifications
Reciprocating piston type
Model
Driving system
NT 65M2
Operating pressure 5 --- 8.5 kgf/cm2 (gauge pressure) (70 to 120 psi)
5-2. Nail Selection
The Model NT 65M2 utilizes small-head, T-shaped nails (finish nails) collated by adhesive. 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.
2.8 mm (0.110")
1.4 mm
(0.054")
25 mm (1")
Minimum
16 gauge finish
Maximum
65 mm (2-1/2")
1.3 mm (0.050")
1.65 mm
(0.065")
Fig. 1 Dimensions of nails

--- 3 ---
5-3. Explanation of the Nailing Action
To meet the requirements of "ANSI SNT-101-2002", the Model NT 65M2 is equipped with a nailing operation
switching device at the valve portion 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. Each nailing operation is as follows.
SINGLE ACTUATION MECHANISM (SINGLE SEQUENTIAL ACTUATION MECHANISM):
First, press the pushing lever against the wood; next, pull the trigger to drive the nail. First, pull the trigger;
next, press the pushing 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 pushing lever against the wood; next, pull the trigger to drive the nail. First, pull the trigger;
next, press the pushing lever against the wood to drive the nail. If the trigger is held back, a nail will be driven
each time the pushing lever is pressed against the wood.

--- 4 ---
5-4. Nail Driving Force
Figure 2 shows the nailer output energy provided by the supply pressure and the required nailing energy for
driving the nail flush with surface of a workpiece with variables of types of wood and nails. 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 65 mm (2-1/2") nail into a hard wood workpiece
with the Model NT 65M2, a pressure of about 5.5 kgf/cm2(78 psi, 5.4 bar) allows the nailer to drive the nail flush
with the surface. A pressure beyond this value causes the nail head to be driven below the wood surface.
Figure 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 of NT 65M2 to drive nail flush
Q
P
NT 65M
NT 65M2

--- 5 ---
1 --- 2-1/2 in.
(25 --- 65 mm)
6. COMPARISONS WITH SIMILAR PRODUCTS
0.054 --- 0.065 in.
(1.4 --- 1.65 mm)
Maker HITACHI
Air consumption at
7 kgf/cm2(100 psi)
Operating pressure
Magazine type
Weight
Dimensions
(L x H x W)
Model
Nail capacity
(2-1/2" x 16 Gauge)
5 --- 8.5 kgf/cm2
(70 --- 120 psi)
11.6 x 11.2 x 2.8 in.
(295 x 285 x 71 mm)
NT 65M2
0.042 ft3/cycle
(1.2 ltr/cycle)
100 nails
Top loading
1.7 kg (3.7 lbs.)
5 --- 8.5 kgf/cm2
(70 --- 120 psi)
11.6 x 10.9 x 2.8 in.
(295 x 276 x 72 mm)
NT 65M
0.042 ft3/cycle
(1.2 ltr/cycle)
100 nails
Top loading
1.7 kg (3.7 lbs.)
5 --- 8.5 kgf/cm2
(70 --- 120 psi)
11.8 x 10.7 x 2.9 in
(299 x 272 x 74 mm)
0.039 ft3/cycle
(1.1 ltr/cycle)
100 nails
Top loading
1.8 kg (4.0 lbs.)
Provided
P
Blow nozzle Provided Provided None
Direction change of
exhaust air
Handing grip
Applicable
nails
(16 Ga. finish) Length
Dia.
Provided
Rubber
0.054 --- 0.065 in.
(1.4 --- 1.65 mm)
Provided
Rubber
1 --- 2-1/2 in.
(25 --- 65 mm)
Rubber
3/4 --- 2-1/2 in.
(19 --- 65 mm)
0.054 --- 0.065 in.
(1.4 --- 1.65 mm)
None
5 --- 8.5 kgf/cm2
(70 --- 120 psi)
11.9 x 11.1 x 3 in
(301 x 283 x 76 mm)
0.056 ft3/cycle
(1.6 ltr/cycle)
100 nails
Top loading
1.7 kg (3.7 lbs.)
Provided
Q
Rubber
1 --- 2-1/2 in.
(25 --- 65 mm)
0.054 --- 0.065 in.
(1.4 --- 1.65 mm)
None
Single actuation/contact
actuation selector Provided Provided None
Jam-release Provided Provided Provided Provided
Tool less
Driving depth
adjustment mechanism Tool less Tool less Tool less

--- 6 ---
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Model NT 65M2 Nailer by all of our customers,
it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously recognizes
the importance of the contents of the Handling Instructions, and fully understands the meaning of the precautions
listed on the Warning Label attached to each tool.
7-1. Handling Instructions
Although every effort is made in each step of design, manufacture, and inspection to provide protection against
safety hazards, the dangers inherent in the use of any pneumatic tool cannot be completely eliminated.
Accordingly, 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 Handling Instructions to enhance the safe, efficient
use of the tool by the customer.
Salespersons must be thoroughly familiar with the contents of the Handling Instructions to be able to offer
appropriate guidance to the customers during sales promotion.
7-2. Warning Label
Each Model NT 65M2 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.
Read and understand tool labels and manual. 
Failure to follow warnings could result in DEATH
or SERIOUS INJURY. Operators and others in 
work area MUST wear safety glasses with side
shields. Keep fingers AWAY from trigger when 
not driving fasteners to avoid accidental firing.
Choice of triggering method is important. 
Check manual for triggering options. 
NEVER point tool at yourself or others in 
work area. DISCONNECT AIR before 
servicing, unjamming or when not in 
use. NEVER use oxygen or other 
bottled gasses. Explosion 
may occur. DO NOT 
EXCEED 120psi/8.3bar.
C331826D

--- 7 ---
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 Handling Instructions
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 1926.102 Eye and face protection
1926.302 Power-operated hand tools
ANSI SNT-101-2002 Portable, Compressed-Air-Actuated,
Fastener Driving Tools-Safety Requirements for

--- 8 ---
8. MECHANISM AND OPERATION PRINCIPLE
8-1. Mechanism
As illustrated in Fig. 3, the Model NT 65M2 can be generally divided into four sections:
output section, control valve section, driving section and magazine section.
(1) Output section .................. (1) The body and the exhaust cover are made of aluminum and their thickness is
reduced for weight saving.
(2) The internal structure of the exhaust cover is common to the Model
NT 65MA2.
(3) The air duster section is common to the Model NT 65MA2.
(2) Control section .................. Common to the Model NR 90AD.
(3) Driving section .................. Most of parts have been newly designed.
(1) The adjuster is common to the model NT 65MA2.
(2) Pushing lever (A) is the same as the Model NT 65MA2.
(4) Magazine section .............. Most of parts have been newly designed.
(1) The top-loading magazine is the same as the Model NT 65M.
(2) The nail feeding structure is similar to the Model NT 65M.

--- 9 ---
Fig. 3 Construction
Exhaust valve
Return air
chamber
Driver blade
Cylinder [13]
Piston [12]
Piston Bumper [18]
Lock Lever [76]
Guide Plate (A) [75]
Pushing Lever (A) [43]
Control valve section
Blow nozzle section
Accumulator
Air inlet
Magazine Cover [71]
Magazine section
Grip Rubber (A) [45]
Driving section Output section
Exhaust vent
Valve Bushing (B) [60]
Control valve section
Valve Piston [63]
Switching
device
(Change
Knob (C) [58])
Plunger [67]
Trigger (C) Ass'y [36]
Cylinder Ring [17]
Cylinder Plate [16]
O-ring (S-10) [25]
O-ring (1AP-3) [24]
Spring [21]
Valve Packing [20]
Valve
Bushing [26]
O-ring (S-3) [23]
Plunger [22]
Blow nozzle section
Accumulator
Plunger Spring [65]
Valve Bushing (A) [68]
Pushing Lever Guide [38]
Pushing Lever (B) [40]

--- 10 ---
8-2. Operation Principle
(1) Before nailing (See Fig. 4 and Fig. 5.)
1) When compressed air is fed to the main body, it
fills the accumulator ( portion).
2) At the same time, the compressed air flows into
the valve piston lower chamber of the control valve
section and forces the Valve Piston [63] upward.
Compressed air is then 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 to seal Head Valve (A) [10] and the Cylinder
[13].
(2) When nailing (See Fig. 4 and Fig. 5.)
1) When Pushing Lever (A) [43] and Trigger (C) Ass'y
[36] are operated together and the Plunger [67] is
pushed upward, the compressed air in the valve
piston lower chamber is discharged from the
bottom of the Plunger [67]. As a result, the
compressed air in the accumulator ( portion)
pushes down the Valve Piston [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 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 the Exhaust Cover [5], blocking the
passage to the exhaust vent.
4) When Head Valve (A) [10] goes up, the
compressed air in the accumulator flows rapidly
into the Cylinder [13], forcing the Piston [12]
downward to strike the nail. When the Piston [12]
passes the cylinder hole, the compressed air flows
into the return air chamber and is accumulated
there.
Fig. 5 Control valve section
Fig. 4
Head valve chamber
Nail
Air passage
Control valve
section
Cylinder hole
Head Valve Spring [8]
Head Valve (A) [10]
Cylinder [13]
Return air chamber
Pushing Lever (A) [43]
Piston [12]
Accumulator
Trigger (C)
Ass'y [36]
To the head valve chamber
Plunger [67]
Valve piston
Valve piston
lower chamber
Exhaust valve
Air passage
Accumulator
Air supply vent
Control valve section

--- 11 ---
(3) During return (See Fig. 6 and Fig. 7.)
1) When either Pushing Lever (A) [43] or Trigger (C)
Ass'y [36] is released, the Plunger [67] 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 the Valve Piston
[63], the Valve Piston [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 ( portion) 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 the Cylinder
[13] are sealed and, at the same time, Head Valve
(A) [10] and the Exhaust Cover [5] separate to
open the exhaust vent.
4) The compressed air above the Piston [12] is
discharged into the atmosphere through the
exhaust vent. In this way, the air pressure above
the Piston [12] is reduced, and the greater
pressure of the air accumulated in the return air
chamber pushes the Piston [12] upward.
5) If the air pressure below the Piston [12] is higher
than that of the atmosphere after the Piston [12]
has fully returned, the excess air pressure is
discharged into the atmosphere through the
clearance between the Piston Bumper [18] and the
driver blade. Fig. 7 Control valve section
Fig. 6
Head valve chamber
Control valve section
Piston
Bumper [18]
Head Valve (A) [10]
Return air
chamber
Piston [12]
Accumulator
Trigger (C)
To the head valve chamber
Plunger [67]
Valve Piston [63]
Exhaust valve
Accumulator
Air supply vent
Cylinder [13]
Head Valve
Spring [8]
Cylinder hole

--- 12 ---
(4) Single actuation mechanism/contact actuation mechanism: (Fig. 8 and Fig. 9)
Single/contact actuation mechanism changeover is accomplished by turning the switching device
(Change Knob (C) [58]).
Single actuation mechanism (Switching device:
upward position):
1) Immediately after driving the first nail, the
control valve should be as shown in Fig. 7.
2) When only Pushing Lever (B) [40] is released
and Trigger (C) Ass'y [36] is held as shown in
Fig. 8, the plate of Trigger (C) Ass'y [36]
contacts Change Knob (C) [58] and the Plunger
[67] returns (lowers) only halfway.
Because of this, compressed air does not flow
into the valve piston lower chamber, and Valve
Piston [63] remains in the lowered position.
Accordingly, the Piston [12] remains in the
lowered position as shown in Fig. 6.
3) When Trigger (C) Ass'y [36] is released, the
Plunger [67] returns (lowers) completely as
shown in Fig. 5. Compressed air then flows into
the valve piston lower chamber, and the Valve
Piston [63] is forced upward. The Piston [12]
then returns fully upward. Therefore, unless
Trigger (C) Ass'y [36] 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. 7.
2) Even when only Pushing Lever (B) [40] is
released and Trigger (C) Ass'y [36] is held, the
Plunger [67] returns (lowers) completely as
shown in Fig. 9. Thus the Piston [12] returns
(raises) fully. Accordingly, continuous nailing
can be accomplished by pushing only Pushing
Lever (B) [40] up and down while holding
Trigger (C) Ass'y [36] depressed.
Plunger [67]
Valve piston
lower chamber
Trigger (C)
Ass'y [36]
Valve Piston [63]
Accumulator
Switching device (Change Knob (C) [58])
(Upward position)
Fig. 8 Single actuation mechanism
Plunger [67]
Pushing Lever (B) [40]
Valve portion
lower chamber
Trigger (C) Ass'y [36]
Valve Piston [63]
Accumulator
Switching device (Change Knob (C) [58])
(Downward position)
Fig. 9 Contact actuation mechanism

--- 13 ---
Remove the abnormal nails
and load the magazine with
normal nails.
<Magazine>
Nail groove of the magazine
is abnormal (too wide, too
narrow, deformed or
damaged).
Magazine is not loaded with
specified genuine nails.
Problem Possible cause Inspection method Remedy
Repair or replace the
defective part.
9. TROUBLESHOOTING GUIDE
9-1. Troubleshooting and Correction
1) Nails cannot
be driven.
Check if the magazine is
normally loaded with
specified nails.
Check if nails (one strip)
move smoothly in the
magazine.
Check if the nail feeder
operates smoothly in the
magazine.
Use specified nails.
Remove the adhesive
fragments and apply oil to
the nail feeder, ribbon spring
and the nail rail.
Magazine is loaded with
abnormal nails (bent nails,
large or small head nails,
abnormal collation, etc.).
Magazines (A) and (B) are
abnormal (deformed or
damaged).
Nail feeder is abnormal
(deformed or damaged).
Ribbon sping is abnormal
(deformed or damaged).
Magazine cover is abnormal
(deformed, damaged or
fatigued).
Check the nail feeding
section for abnormal
conditions (burrs, fatigued,
deformed or damaged).
<Blade guide>
Nail inlet groove of the
blade guide is abnormal
(deformed, burrs or
damaged).
Repair or replace the
defective part.
Remove the adhesive
fragments.
Adhesive fragments are in
the nail inlet groove.
Check if nails (one strip)
are fed smoothly into the
nail injection port of the
blade guide.
Collating band is abnormally
adhesive.
<Nails>

--- 14 ---
Head valve sliding surface
is abnormal (galled,
damaged or needs oil).
Problem Possible cause Inspection method Remedy
Check if nails can be driven
at 5 kgf/cm2.
Driver blade is abnormal
(deformed, burrs, damaged
or fatigued).
Cylinder ring is abnormal
(dislocated, deformed or
damaged).
Replace the piston bumper.
Reassemble or replace.
Remove the dirt and apply
oil, or replace.
Replace the defective part.
Air pressure is too low.
Piston O-ring is worn or
damaged.
Pull the nail feeder
backward and perform idle
driving. Check if the driver
blade has returned.
Adjust for 5 to 8.5 kgf/cm2
(70 --- 120 psi).
<Output section>
Replace the piston O-ring.
Plunger, valve piston, valve
bushing (A) or valve bushing
(B) is abnormal (galled or
damaged).
After making idle driving,
check if the driver blade is
kept in the down position.
Replace the defective part.
<Control valve section>
Cylinder's internal surface is
abnormal (deposits of dirt or
worn).
Repair or replace.
Apply grease.
O-ring is worn or oiling is
needed.
Apply grease or replace.Disassemble the control
valve and check the O-ring.
2) Nails are bent
when being
driven.
See item 1).
Unspecified nails are used.
For short nails, the adjuster
is raised too high.
Do not use unspecified
workpiece.
Nails are not fully fed into
the injection port.
Replace the driver blade.
Workpiece is very hard.
Check if the driver blade tip
is abnormally worn.
Drive a nail into soft wood
workpiece and check if the
nail is bent.
See item 1).
Piston bumper is abnormal
(dislocated, deformed or
damaged.)
Head valve spring is
abnormal (fatigued or
damaged).
While operating the nailer
without nails, check if the
driving operation is
performed.
After operating the nailer
without nails, check if the
driver blade is kept in the
down position.
Driver blade is worn.
Check if the adjuster is
raised too high.
Turn the adjuster to the
lower position to decerase
the pressure.

--- 15 ---
Use specified nails.
See <Magazine> in item 1).
Replace the part.
See <Output section> in
item 1).
Check if the nails are
specified ones.
Check if they move
smoothly after putting nails,
and check if the nail feeder
operates smoothly.
Check if the driver blade tip
is worn.
Perform idle driving or
actually drive with nails, and
check if the driver blade has
returned completely.
Unspecified nails used.
< Improper nail feed >
See <Magazine> in item 1).
Driver blade worn.
< The driver blade has not
returned completely. >
See <Output section> in
item 1).
Adjuster is improperly
adjusted.
Air pressure is too low.
Workpiece is very hard.
Driver blade is worn.
Piston O-ring is abnormal
(worn or damaged).
Cylinder's internal surface is
abnormal (worn or rough).
Problem Possible cause Inspection method Remedy
Check if the nails are lowest
position and drive a nail.
Adjust for 5 to 8.5 kgf/cm2
(70 --- 120 psi).
Do not use unspecified
workpieces.
Replace the driver blade.
Replace the defective part.
3) Head of a nail
driven into a
workpiece
protrudes
from the wood
surface.
Turn the adjuster to the
lowest position and drive a
nail.
Drive a nail into soft wood
workpiece and check if the
head protrudes from the
nose tip.
Operate the nailer without
nails and check if the driver
blade is projected from the
nose cap.
Disassemble the output
section and check the
piston O-ring and the inner/
outer surfaces of the
cylinder for abnormal
condition.
4) Nails clog the
mechanism.
Replace the part.
Replace the part.
Replace the part.
Replace the abnormal parts.
A switching device is set to
the correct position.
Disassemble the control
valve section, and check the
O-ring of the plunger and
the valve piston.
Check each part for
abnormalities (worn,
deformed or damaged).
The position of a switching
device is checked.
O-ring in plunger is worn.
O-ring in valve piston is
worn.
Abnormal plunger sliding
surface of valve piston
(seized or deformed).
Abnormal plunger, trigger
arm (C), push lever (B) and/
or body (worn or damaged).
The position of a switching
device is mistaken.
5) Single
actuation
mechanism is
not possible.

--- 16 ---
9-2. Regrinding the Driver Blade
The tip of the driver blade should be ground as shown in Fig. 10. 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.
Driver blade
Fig. 10
7û

--- 17 ---
9-3. Possible Causes and Correction of Air Leakage
Air leakage repair locatoin
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, flaw and damage.
(3) Then, check other places.
Head Valve (A) [10] and Cylinder [13] are
abnormal (sealing surface b is worn or
deformed).
The O-ring (I.D 20.8) [9] is abnormal (worn,
deformed or damaged).
Head Valve (A) [10] is abnormal (worn,
deformed or damaged).
(A) Exhaust port
Air leakage point
Possible cause
When control valve OFF
(B) Exhaust cover
When control valve ON
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).
The Hex. Socket Hd. Bolt (W/Sp. Washer)
M5 x 25 [4] is loose.
Gasket [6] is damaged.
The seal surface of the Body Ass'y [31] or the
Exhaust Cover [5] is abnormal.
a
b
d
c
e
(A)
(B) (G)
(D)
(C)
(E)
(F)
g
f