Hitachi NV 65AF3 Manual

COIL NAILER
NV 65AF3
LIST No. E005 Aug. 2002
POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
N
MODEL
NV 65AF3

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
MAX CN565S
S
MAKITA AN611
C
SENCO SCN55S
Q

Page
CONTENTS
1. PRODUCT NAME.....................................................................................................................1
2. MARKETING OBJECTIVE .......................................................................................................1
3. APPLICATIONS........................................................................................................................1
4. SELLING POINTS ....................................................................................................................1
5. SPECIFICATIONS ....................................................................................................................2
5-1. Specifications........................................................................................................................... 2
5-2. Nail Selection........................................................................................................................... 3
5-3. Nail Driving Force .................................................................................................................... 5
6. COMPARISONS WITH SIMILAR PRODUCTS ........................................................................6
6-1. Specifications........................................................................................................................... 6
6-2. Adjusting the Nailing Depth...................................................................................................... 7
6-3. Reduction of Exhaust Pressure with Muffler............................................................................ 7
6-4. Dual Action Trigger .................................................................................................................. 8
6-5. Precautions in Operation ......................................................................................................... 9
6-6. Loading Wire-collated Nails ..................................................................................................... 9
7. PRECAUTIONS IN SALES PROMOTION .............................................................................10
7-1. Instruction Manual ................................................................................................................. 10
7-2. Warning Label........................................................................................................................ 10
7-3. Related Laws and Regulations .............................................................................................. 10
8. MECHANISM AND OPERATION PRINCIPLE .......................................................................11
8-1. Mechanism .............................................................................................................................11
8-2. Operation Principle ................................................................................................................ 14
9. TROUBLESHOOTING GUIDE ...............................................................................................16
9-1. Troubleshooting and Correction.............................................................................................16
9-2. Possible Causes and Corrections of Air Leakage.................................................................. 21
10. DISASSEMBLY AND REASSEMBLY ..................................................................................24
10-1. General Precautions in Disassembly and Reassembly ....................................................... 24
10-2. Disassembly and Reassembly of the Output Section.......................................................... 25
10-3. Disassembly and Reassembly of the Control Valve Section ............................................... 26
10-4. Disassembly and Reassembly of the Magazine Section ..................................................... 29
10-5. Disassembly and Reassembly of the Driving Section ......................................................... 32
11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ...........................................36
12. STANDARD REPAIR TIME (UNIT) SCHEDULES ...............................................................37
Assembly Diagram for NV 65AF3

--- 1 ---
1. PRODUCT NAME
Hitachi 2-1/2" Coil Nailer, Model NV 65AF3
2. MARKETING OBJECTIVE
Hitachi coil nailer Model NV 65AF3 has already been introduced on Japan market. This time, it will be put on
Oceania market to compete with S, C and Q. The Model NV 65AF3 is the most lightweight and powerful coil
nailer in this class and equipped with a muffler to minimize the exhaust sound and blowing dust. In addition, the
pop-out magazine allows easy nail loading from the top of the magazine thanks to the tiltable nail holder.
Please expand the sales of the new Model NV 65AF3 on Oceania market.
3. APPLICATIONS
Floor and wall framing
Truss and window built-up
Subflooring and roof decking
4. SELLING POINTS
Lightweight, only 1.9 kg (4.2 lbs.)
Reduce exhaust
pressure with muffler
Easy nail loading with
pop-out nail holder
More powerful 10% than S
Dual action trigger
(Contact and single sequential action)

--- 2 ---
Optional accessories
Air consumption
1.9 kg (4.2 lbs.)
PT 1/4 Thread
Corrugated cardboard box (sleeve type)
Min. 3 nails/sec.
Driving speed
282 mm x 297 mm x 128 mm
(10-13/16" x 11-5/8" x 5")
1.6 ltr/cycle at 7 kgf/cm2(0.056 ft3/cycle at 100 psi)
Dimensions
(Length x height x width)
Nail capacity
PT 1/4 Japanese
Standard accessories
Weight
200 --- 400 nails (1 coil)
Air inlet
Air plug
Packaging dimensions
(Length x height x width)
Packaging
355 mm x 410 mm x 170 mm
(13" x 16-5/32" x 6-11/16")
*Carrying case
Eye protector
Oiler
Nose cap
5. SPECIFICATIONS
5-1. Specifications
Reciprocating piston type
Model
Driving system
NV 65AF3
Operating pressure 5 --- 8.5 kgf/cm2(Gauge pressure) {70 --- 120 psi, 4.9 --- 8.3 bar}
Length: 32 --- 65 mm
Applicable
nail sizes Wire collated
Plastic sheet collated Length: 32 --- 50 mm

--- 3 ---
5-2. Nail Selection
The Model NV 65AF3 utilizes common round-head nails collated by wire or plastic sheet into coils from 200 to 400
nails. Applicable nail dimensions 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.
5 mm
(0.197")
38 mm (1-1/2")
Min.
Fig. 1 Dimensions of nails
Max.
6 mm
(0.236")
2.8 mm
(0.110")
2.4 mm
(0.094")
4.8 mm
(0.189")
32 mm (1-1/4")
Min. Max.
6 mm
(0.236")
65 mm (1-1/2")
2.8 mm
(0.110")
2.1 mm
(0.083")
Wire-collated nails Sheet-collated nails
57 mm (2-1/4")

--- 4 ---
Unit: mm (inch)
Fig. 2 Dimensions of wire-collated nails
38 ---57
(1-1/2 ---2-1/4)
L2.3 ---2.8
(0.090 ---0.110)
d20
(0.787)
D2 D1
61.5
(2.421)
118
(4.645)
H
Fig. 3 Dimensions of sheet-collated nails
32 ---57
(1-1/4 ---3-1/4)
45 ---65
(1-3/4 ---2-1/2)
L
2.1 --- 2.3
(0.083 ---0.090)
2.5 --- 2.8
(0.099 ---0.110)
d
Type
B
A0.6
(0.024)
19
(0.748) 37.5
(1.476)
d1L1L2
65
72
H
0.7
(0.028)
12
(0.472) 24
(0.945) 22 ---30
(0.866 ---1.181)
D1
118 MAX
(4.645 MAX)
D2
6 or 8
(0.236 or 0.315)

--- 5 ---
20
0100
0.15
2.3 X 38 mm (0.090" X 1-1/2")
Size of nail
Air pressure setting to drive nail flush with NV 65AF3
2.3 X 45 mm (0.090" X 1-3/4") 2.5 X 50 mm (0.099" X 2") 2.5 X 57 mm (0.099" X 2-1/4") 2.5 X 65 mm (0.099" X 2-1/2")
0.20 0.25 0.30 0.35
150 200 250
20
40
60
80
200
400
600
800
40
60
(ft-lb)
(mm
2
)
(in
2
)(kgf/cm
2
)
(psi)
(J)
20
04
4
5 6 7 8 8.3
20
40
60
80
200
400
600
800
40
60
(ft-lb)
(bar)
(kgf
• cm)(kgf • cm) (J)
5 6 7 8 8.5
60 70 80 90 100 110 120
NV 65AF3
Hemlock
2.8 X 65 mm (0.110" X 2-1/2")
C
S
5-3. Nail Driving Force
Fig. 4 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 2.5 mm dia. x 65 mm length (0.099" x 2-1/2") into a workpiece of hemlock with
the Model NV 65AF3, a pressure of about 6 bar (6.1 kgf/cm2, 87 psi) allows the nailer to drive the nail flush with
the wood surface. A pressure beyond this value causes the nail head to be driven below the wood surface.
Fig. 4 should be used as a reference only because those values vary depending on the type of wood, moisture
content, and grain of wood.
Fig. 4 Required nailing energy and nailer output energy
Required nailing energy Nailer output energy

--- 6 ---
Length
Dimensions Height
Width
Trigger lock
Nailing system
Depth adjustment
Toe nailing
Dust filter
Belt hook
Piston
Contact top
Case
6. COMPARISONS WITH SIMILAR PRODUCTS
6-1. Specifications
Maker
Air consumption at
100 psi (6.9 bar)
Operating pressure
Applicable
nails
Nail loading
Magazine type
Weight
Nail capacity
Length
Exhaust muffler
(noise level)
Shank dia.
Collation type
Model name
Head dia.
HITACHI
NV 65AF3
5 --- 8.5 kgf/cm2
(70 --- 120 psi)
(4.9 --- 8.3 bar)
1.9 kg (4.2 lbs.)
282 (11-3/32)
297 (11-5/8)
128 (5)
1.6 ltr/nail
Side open and pop-
out nail holder
200 --- 400
Poly-carbonate
Wire
32 --- 65
2.1 --- 2.8
4.8 --- 6.0
Provided
(91 dB)
Provided
Auto contact/single
Dial
Aggressive
Not provided
Provided
Piston ring
Provided
Provided
Sheet
38 --- 57
2.4 --- 2.8
5.0 --- 6.0
2.6 kg (5.8 lbs.)
267 (10-1/2)
327 (12-7/8)
---
---
Side open
350
---
Wire
32 --- 65
Not provided
( --- )
Not provided
Contact
Plain
Not provided
Not provided
O-ring
Provided
Not provided
Sheet
32 --- 65
4.5 --- 8.5 kgf/cm2
(65 --- 120 psi)
(4.4 --- 8.3 bar)
2.2 kg (4.9 lbs.)
332 (13-1/16)
317 (12-15/32)
---
1.8 ltr/nail
Side open
200 --- 400
---
Wire
32 --- 65
Not provided
(96 dB)
Provided
Contact/single
Dial
Aggressive
Provided
Not provided
O-ring
Provided
---
Sheet
32 --- 50
S
5 --- 7 kgf/cm2
(70 --- 100 psi)
(4.9 --- 6.9 bar)
2.2 kg (4.9 lbs.)
273 (10-3/4)
318 (12-9/16)
130 (5-1/8)
1.5 ltr/nail
Side open
250 --- 400
6-nylon
Wire
38 --- 65
2.1 --- 2.5
4.8 --- 6.0
Not provided
(92 dB)
Provided
Auto contact/single
Dial
Plain
Provided
Not provided
O-ring
Provided
Provided
Sheet
32 --- 65
2.3 --- 2.5
5.0 --- 6.0
CQ
---

--- 7 ---
6-2. Adjusting the Nailing Depth
The nailing depth is adjustable by turning the adjuster.
* Adjusting the adjuster (Fig. 5)
Fig. 5
Flush
Adjuster
Too deep
(Turn the
adjuster to the
shallow side.)
Too shallow
(Turn the
adjuster to the
deep side.)
Fig. 6
Carry out test driving. If the nails are too deep, turn the adjuster to the shallow side ( mark). If the nail
depth is too shallow, turn the adjuster to the deep side ( mark) (see Figs. 5 and 6). Depth is changed 1 mm
with each rotation of the adjuster.
Do not push up the pushing lever when turning the adjuster.
Place the lock lever in "FREE" position when driving nails.
6-3. Reduction of Exhaust Pressure with Muffler
Comparison of blowing dust (The area where concrete dust is blown is shown in black.)
Conditions: Nailed 5 times at 0.69 Mpa {7 kgf/cm2}. Used concrete dust.
NV 65AF3
Testing method
Actual example: A glove
was set to the air outlet
of the nailer to avoid
blowing dust (at the
interior finish work site)
Concrete dust is
placed on a board.
Concrete dust
Air outlet
Lock
Lock lever
FREE
SHALLOW
DEEP
CS
70 mm
520 mm
660 mm

--- 8 ---
6-4. Dual Action Trigger
The Model NV 65AF3 is equipped with a mechanism that allows switching the mode automatically between
"single sequential actuation" and "contact action" (see section 9 for the mechanism). Although S features a
similar automatic switching function, the mechanism is different from the Model NV 65AF3.
(1) Method of driving operation (automatic switching between single sequential actuation mode and contact action
mode)
Single
sequential
actuation
mode
Contact
action
mode
Depress the
pushing lever. Pull the trigger. Depress the pushing lever.
Driven Not driven
1 2 3
Pull the trigger. Depress the pushing
lever. Depress the pushing
lever.
Driven Driven
Nail driving Nail driving
(2) Precautions for using dual action trigger
Nails are not driven even if the pushing lever is pushed against the workpiece again with the trigger pulled in
the single sequential actuation mode. To drive nails continuously, remove finger from the trigger and operate
according to the procedure of the contact action.
When the Model NV 65AF3 is raised from the floor (pushing lever was pushed against the floor) with the
trigger pulled, the Model NV 65AF3 turns into the single sequential actuation mode. Therefore, nails are not
driven even if the pushing lever is pushed against the workpiece. Release the trigger and operate according
to the procedure of the desired mode.

--- 9 ---
6-5. Precautions in Operation
(1) Pay special attention to the pressure, capacity and piping of the air compressor in order to keep the air
pressure supplied to the Model NV 65AF3 within the range from 0.44 MPa {4.5 kgf/cm2} to 0.78 MPa
{8 kgf/cm2}. Otherwise, ill effect may be given to the performance, service life and safety of the Model
NV 65AF3.
(Be sure to install a regulator when using a high-pressure air compressor whose set pressure is 0.9 MPa
{10 kgf/cm2} or more. In this case, adjust the air pressure at 0.78 MPa {8 kgf/cm2} or less.)
(2) The sliding portion of the piston is made of special materials and there is no need to lubricate every time
before and after operation. However, if dust in the compressed air settles on the sliding portion, the Model
NV 65AF3 will not work properly. Lubrication is effective to remove dust and also to prolong the service life of
the Model NV 65AF3 keeping good performance. It is recommended to lubricate the Model NV 65AF3 one or
two times per month. Supply 5-10 drops of lubricant into the air plug on the Model NV 65AF3.
When not in use for an extended period, supply lubricant and perform idle driving two or three times to
lubricate the inside entirely, then apply a thin coat of lubricant to the steel parts to avoid rusting.
Usable lubricant is specified in the following table. Please recommend the customers to use Hitachi nailer/
tacker oil.
(3) Be sure to drain the tank of the compressor securely to prevent deteriorated performance or malfunction of the
Model NV 65AF3 due to rusting.
(4) Instruct the customers (especially the heavy users) to perform inspection and maintenance securely.
6-6. Loading Wire-collated Nails
Observe the instructions specified in the caution plate on the magazine when loading wire-collated nails.
Driving hole
Magazine
First nail
Type of oil Brand or product name
Hitachi Pneumatic Tool Lubricant Shell sliding oil, Tonna S32
(Old Tonna T32);
Code No. 877153 (1 oz. oil feeder)
Code No. 874042 (4 oz. oil feeder)
Code No. 876212 (1L (1 quart) can)

--- 10 ---
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Model NV 65AF3 Nailer by all of our
customers, it is very important that at the time of sale the salesperson carefully ensures that the buyer seriously
recognizes the importance of the contents of the Instruction Manual, and fully understands the meaning of the
precautions listed on the Warning Label attached to each tool.
7-1. Instruction Manual
Although every effort is made in each step of 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 and
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 NV 65AF3 unit is provided with a Warning Label (illustrated below) which lists basic safety
precautions in its use. Carefully ensure that the customers fully understand and follow these precautions before
using the tool.
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 advise the customer properly. Please check your national
and/or local regulations for applicable items. Some applicable items are outlined below.
OSHA 1926.102 Eye and Face Protection
1926.302 Power-Operated Hand Tools
ANSI SNT-101-1993 Portable, Compressed-Air-Actuated,
Fastener Driving Tools-Safety Requirements for
AS/NZS 1337: 1992 Eye Protection for Industrial Application

--- 11 ---
8. MECHANISM AND OPERATION PRINCIPLE
8-1. Mechanism
As illustrated in Fig. 7, the Model NV 65AF3 can be generally divided into four sections: output section, control
valve section, driving section and magazine section.
Most of the parts of the above sections have been newly designed to allow the use of nails of 65 mm (2-1/2")
length, though its basic construction is the same as that of the Model NV 65AD3. Primary differences from the
Model NV 65AD3 are described below.
Output section ................... The body and exhaust cover have been newly designed for greater power output.
In addition, the piston (driver blade), cylinder and cylinder plate have been newly
designed to lengthen the piston stroke.
Control valve section .......... Trigger (A), trigger pin, valve bushing (A), valve piston (B) and plunger (A) have
been newly designed for dual action trigger. Note that these parts are not
interchangeable with those of the Model NV 65AD3.
Driving section .................... The nose feeder, nail guide, nail stopper (A), nail stopper (B) and pushing lever
(B) have been newly designed for driving 65 mm (2-1/2") long nails.
Magazine section ................ The magazine cover, nail holder and holder shaft have been newly designed for
driving 65 mm (2-1/2") long nails.

--- 12 ---
Mechanism of dual action trigger
Single sequential actuation mode
Contact action mode
Plunger (A)
Trigger arm (B)
Pushing lever
piece
Spring
Trigger
Protrusion
Engaged a
little.
The protrusion is caught by
plunger (A) and trigger arm
(B) is moved backward.
Pushing lever (C)
The pushing lever is lowered by lifting
the main body.
Engaged largely.
It is not
disengaged.
Trigger arm (B)
is disengaged
from the pushing
lever (C).
Protrusion
Trigger arm
(B) is not
pushed.
1 Depress the pushing lever.
1 Pull the trigger.
Trigger
2 Pull the trigger.
2 Depress the
pushing lever.Driving
operation The pushing lever is lowered by lifting
the main body.
The protrusion
is in front of
plunger (A) and
it is not caught
by plunger (A).
Not
driven.
3 Even if the pushing
lever is depressed,
Driven.
3 If the pushing lever
is depressed,
Trigger arm
(B) is pushed.
Driving
operation

--- 13 ---
Control valve section
Trigger
Head Valve (A)
Exhaust Cover
Top Cover
Plunger Spring
Exhaust vent
Piston Bumper
Cylinder
Piston (H)
(Driver Blade)
Protector (A) Cap
Feeder
Nose
Dust Cap
Control valve
section Body
Hook
Adjuster
Valve Bushing (B)
Valve Bushing (A)
Plunger (A)
Valve Piston (B)
Pushing Lever
Nail HolderMagazine
Nail Guide
Driving Hole
Magazine Cover
Cross section A - A
Feed Piston
Guide Lock
Feeder
Fig. 7 Construction
Driving section Output section
Cylinder
Plate
Magazine section

--- 14 ---
(1) Prior to nailing (see Fig. 8)
1. When compressed air is supplied to the main body,
it fills the accumulator (see diagram).
2. At the same time, the compressed air flows into the
valve piston lower chamber of the control valve
section, and pushes up the valve piston. Also, the
compressed air flows from the air supply vent,
through air passage (A), and into the head valve
upper chamber where it simultaneously pushes
down the head valve and the head valve spring to
seal the upper surface of the head valve and the
cylinder.
(2) During nailing (I) (see Fig. 9)
1. When plunger (A) is pushed up by operating both
the pushing lever and trigger (A), the compressed
air in the valve piston lower chamber is exhausted
from the lower part of plunger (A). Then, the valve
piston is pushed down by the compressed air from
the accumulator so that it shuts off the air supply
vent and releases the exhaust valve.
2. When the exhaust valve opens, the compressed air
in the head valve upper chamber is exhausted into
the atmosphere through air passage (A).
3. The air pressure applied against the lower surface
of the head valve soon exceeds the force of the
head valve spring, and pushes the head valve up.
The head valve is pushed fully upward by the
compressed air, and seals the upper surface of the
exhaust cover and the head valve.
4. When the head valve is pushed up, the
compressed air flows rapidly into the cylinder and
pushes down the piston to drive a nail. At this time,
the compressed air flows through the cylinder hole,
into the return air chamber, through air passage (B),
and into the chamber at the left side of the feed
piston in the nail feeder section. When the air
pressure exceeds the force of the feed spring, the
feeder moves to the right.
8-2. Operation Principle
Cylinder
Head valve spring Air passage (A)
Head valve Accumulator
Valve piston (B)
Control
valve
section
Air supply vent
Pushing
lever (A)
Fig. 8 Prior to nailing
Air supply vent
Fig. 9 During nailing (I)
Exhaust valve
Accumulator
Exhaust cover
Air passage (A)
Head valve spring
Head valve
Cylinder hole
Piston
Cylinder
[Return air
chamber]
Air passage
(B)
Plunger (A)
Trigger (A)
Pushing
lever (A)
Valve piston
Nail feeder
section
Feed spring
Feed piston
Feeder
Pushing lever (B)

--- 15 ---
(3) During nailing (II) (see Fig. 10)
1. When the piston moves down inside the cylinder,
the air below the piston flows through air passage
(C) under the cylinder and is accumulated in the
return air chamber together with the compressed air
flowing through the cylinder hole.
2. When the compressed air in the left chamber of the
feed piston moves the feed piston fully to the right,
the nail feeder (feed pawl) engages the next nail.
(4) After nailing (see Fig. 11)
1. When the trigger is released, the plunger goes
down, the air supply vent opens, the valve piston
goes up, and the compressed air in the
accumulator passes through air passage (A) into
the head valve upper chamber. The head valve is
then pushed down by the head valve spring and the
air pressure against the upper surface of the head
valve. At the same time, the exhaust valve opens
and the upper chamber of the cylinder is opened to
the atmosphere.
2. When the head valve seals the upper surface of the
cylinder, the compressed air accumulated in the
return air chamber passes through air passage (C),
presses on the lower surface of the piston, and
forces the piston to return upward to its original
position. Also, the compressed air above the piston
is exhausted through the head valve hole.
3. The compressed air accumulated in the left
chamber of the feed piston passes through air
passage (B), goes into the return air chamber, and
is then exhausted through the nose hole. The feed
piston is then moved to the left by the force of the
feed spring, and the feed pawl feeds the next nail
into the ejection port. This completes one full
nailing cycle.
Cylinder
[Return air
chamber]
Air passage (C)
Piston
Nail feeder
Cylinder hole
Fig. 10 During nailing (II)
[Return air
chamber]
Piston
Head valve spring
Head valve
Cylinder
Air passage (A)
Fig. 11 During return
Feed piston
Nail feeder
Air passage (C)
Feed piston
Feed spring
Plunger (A)
Trigger
Valve piston
Air supply vent
[Accumulator]

--- 16 ---
Debbur the nail guide face.
Correct the deformed part.
Replace the abnormal parts.
Problem Possible cause
( : Most-common cause) Inspection method Remedy
9. TROUBLESHOOTING GUIDE
9-1. Troubleshooting and Correction
1) Nails cannot
be driven. <Nails>
Magazine is not loaded with
specified genuine nails.
Magazine is loaded with
abnormal nails (bent nails,
too large or too small nail
heads, abnormal collation,
others).
Nails or link pieces are
jammed.
Link pieces are deformed or
broken.
<Driving section: Nose, feeder,
feed piston, etc.>
Sliding resistance of the
feed piston is too high.
Nail guide face of the nose
is abnormal (deformed,
burrs or damaged).
Feed spring or feeder spring
is abnormal (damaged or
faigued).
Feeder is abnormal
(damaged or worn).
Nails are not correctly
loaded in the groove of the
nose.
Dust sticks to the feeder
sliding portion of the nose,
or lubrication is needed.
Air pressure is too low.
Air passage is clogged
with broken pieces of
piston bumper, etc.
Feed piston chamber
contains foreign matter
such as broken pieces of
piston bumper, etc.
Check that the magazine is
collectly loaded with
specified nails.
Remove the feed piston
and check the feed
piston sliding surface of
the nose.
Use specified nails.
Remove the abnormal nails
and load the nailer with
proper nails.
Check that nails are
correctly loaded in the
groove of the nose.
Open the nail guide and
perform idle driving to check
the feeder's operation.
Apply grease to the sliding
surface.
Polish the scratched portion
with sandpaper. Replace
the parts.
Remove dust and then
lubricate the sliding surface.
Adjust the air pressure to
5 ---8.5 kgf/cm2(4.9 ---8.3
bar, 70 ---120 psi).
Remove foreign matter.
Replace the piston bumper
with new one.
Body ••• Remove foreign
matter in the return
air chamber.
Nose ••• Remove foreign
matter in the air
passage and the
feed piston
chamber.
Check that the driving
section is not abnormal
(burrs, deformed, damaged
or worn).
Load nails in the correct
position in the nose.

--- 17 ---
Replace the piston ring.
Correct or replace the parts.
Air leaks from the gap
between the body and the
nose.
O-rings are worn or
deformed .
O-rings need lubrication.
<Nail guide section>
Nail guide face is abnormal
(deformed, burrs or
damaged).
Dust sticks to the inside of
the nail guide groove, or
lubrication is needed.
Spring is abnormal
(missing, damaged or
fatigued).
The claw ridge section of
the nail stopper is abnormal
(damaged, worn or burrs).
<Magazine section>
<Push lever>
Magazine
Tighten screws and check
the O-rings.
Replace the O-ring.
Apply grease or lubricate.
Check that a nail does not
catch on another nail in the
magazine.
Check that a nail does not
catch on some part of the
magazine.
Check the height of the nail
holder.
Problem Possible cause
( : Most-common cause) Inspection method Remedy
1) Nails cannot
be driven.
(continued)
<Output section: piston,
driver blade, etc.>
Air pressure is too low.
Piston ring is abnormal
(worn or damaged).
Piston bumper is abnormal.
O-ring in the cylinder is
abnormal (removed,
deformed or damaged).
Driver blade is abnormal
(deformed, burrs or
damaged).
Adjust the air pressure to
5 ---8.5 kgf/cm2(4.9 ---8.3
bar, 70 ---120 psi).
Open the nail guide and
perform idle driving to check
that the driver blade is
returned.
Check the operation of the
push lever.
Check that the nail guide is
not abnormal (worn,
deformed, damaged, etc.).
Check the operation of nail
stopper (A) and nail stopper
(B).
Rremove dust and then
lubricate.
Replace the abnormal parts.
Collate the nails correctly
and reload the nailer with
them.
Remove burrs or deformed
part. Replace the parts.
Adjust the height of the nail
holder correctly.
Push lever Correct or replace the parts.
Replace the piston bumper.
Reassemble or replace the
parts.
Correct or replace the part.