COIL NAILER
NV 75AG
LIST No. E006 Aug. 2002
POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
N
MODEL
NV 75AG
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
SCN60
R
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. Nail Selection........................................................................................................................... 3
5-3. Nail Driving Force .................................................................................................................... 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 -------------------------------------------------------------------------------- 7
7-4. Precautions in Operation ---------------------------------------------------------------------------------------- 8
8. MECHANISM AND OPERATION PRINCIPLE .........................................................................9
8-1. Mechanism .............................................................................................................................. 9
8-2. Interchangeability of Parts ......................................................................................................11
8-3. Operation Principle ................................................................................................................ 12
9. TROUBLESHOOTING GUIDE ...............................................................................................14
9-1. Troubleshooting and Correction.............................................................................................14
9-2. Possible Causes and Corrections of Air Leakage.................................................................. 19
10. DISASSEMBLY AND REASSEMBLY ..................................................................................22
10-1. General Precautions in Disassembly and Reassembly ....................................................... 22
10-2. Disassembly and Reassembly of the Output Section.......................................................... 23
10-3. Disassembly and Reassembly of the Control Valve Section ............................................... 25
10-4. Disassembly and Reassembly of the Magazine Section ..................................................... 28
10-5. Disassembly and Reassembly of the Driving Section ......................................................... 31
10-6. Grip Rubber ......................................................................................................................... 35
11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY ............................................36
12. STANDARD REPAIR TIME (UNIT) SCHEDULES ...............................................................37
Assembly Diagram for NV 75AG
--- 1 ---
1. PRODUCT NAME
Hitachi 75 mm (3") Coil Nailer, Model NV 75AG
2. MARKETING OBJECTIVE
Nails 75 mm (3") long are most popularly used for framing work in the U.S.A. Although our current coil nailer
Model NV 83A is capable of driving nails 83 mm (3-1/4") long maximum, it is heavy in weight (3.5 kg (7.7 lbs.)).
C is also heavy in weight (3.6 kg (7.9 lbs.)) even though it is capable of driving nails 70 mm (2-3/4") long
maximum. The newly developed 75 mm (3") coil nailer Model NV 75AG is ultra-lightweight (2.5 kg (5.5 lbs.)) and
features the following:
"Pop-out magazine" allows easy nail loading from the top of the magazine because the nail holder can be
tilted.
Driving depth is adjustable without tool. The driving section is simplified because the depth adjuster is located
near the trigger. The tip of the nose is easy to see and operate.
The exhaust air outlet is 360˚ adjustable without tool.
Capable of driving either wire-collated or sheet-collated nails.
There is a demand for a high-power nailer capable of driving larger-diameter nails from the users of the Model
NV 65AH. The new Model NV 75AG can also satisfy the above demand. Please expand the sales of the new
Model NV 75AG.
3. APPLICA TIONS
Floor and wall framing
Siding, fencing, decking
Wall and roof sheathing
Mobile home and modular housing construction
Crate and pallet construction
Note: The nails of 3.3 mm (.131") dia. x 75 mm (3") length may not be driven reliably into some materials.
Salespersons should instruct the customers to perform a driving test before actual use.
4. SELLING POINTS
Capable of driven both
wire-collated and
sheet-collated nails
360˚ adjustable exhaust
Easy top load
pop-out magazine
Grip rubber
Tool-less depth
adjustment
Lightweight: 2.5 kg (5.5 lbs.)
--- 2 ---
Optional accessories
Nail capacity
2.5 kg (5.5 lbs.)
1.8 ltr/cycle at 7 kgf/cm2 (0.064 ft3/cycle at 100 psi, 1.8 ltr/cycle at 6.9 bar)
Corrugated cardboard box
3 pcs./sec.
Driving speed
271 mm x 338 mm x 132 mm
(10-11/16" x 13-5/16" x 5-3/16")
200 --- 300 nails (1 coil)
Dimensions
(Length x height x width)
Nail feed system
3/8 NPT thread
Standard accessories
Weight
Spiral spring
Air consumption
Air inlet
Package dimensions
(Length x height x width)
Packaging
315 mm x 150 mm x 386 mm
(12-3/8" x 5-7/8" x 15-1/4")
Eye protector (Code No. 875769)
..............................................................
1
Hex. bar wrench for M6 screw (Code No. 944459)
....................................
1
Hex. bar wrench for M5 screw (Code No. 944458)
....................................
1
Hex. bar wrench for M4 screw (Code No. 943277)
....................................
1
Nose cap (Code No. 883106)
.....................................................................
1
Pneumatic tool lubricant (1 oz oil feeder) (Code No. 877153)
Pneumatic tool lubricant (4 oz oil feeder) (Code No. 872042)
Pneumatic tool lubricant (1 quart can) (Code No. 876212)
Sequential fire parts set (Code No. 881973)
Case (Code No. 883323)
5. SPECIFICATIONS
5-1. Specifications
Reciprocating piston type
Model
Driving system
NV 75AG
Operating pressure
5 --- 8.5 kgf/cm2 (70 --- 120 psi, 4.9 --- 8.3 bar) (Gauge pressure)
--- 3 ---
5-2. Nail Selection
The Model NV 75AG utilizes common round-head nails collated by wire or sheet into coils from 200 to 300 pieces.
Applicable nail dimensions are shown below. However, it is recommended to use genuine HITACHI nails to
ensure satisfactory driving quality.
CAUTION: Ensure that nails are as specified in Figs. 1, 2 and 3. Other nails will cause clogging of nails
and subsequent damage to the nailer.
NOTE: Aluminum nails may bend when driven into a hard workpiece. Test before use.
5.7 mm
(0.224")
45 mm (1-3/4")
Min.
Fig. 1 Dimensions of nails
Max.
6 mm
(0.236")
2.5 mm
(0.099")
2.3 mm
(0.090")
6 mm
(0.236")
45 mm (1-3/4")
Min.
Max.
7.2 mm
(0.283")
75 mm (3")
3.3 mm
(0.131")
2.5 mm
(0.099")
Wire-collated nails
Sheet-collated nails
57 mm (2-1/4")
--- 4 ---
Unit: mm (inch)
Fig. 2 Dimensions of wire-collated nails
45 --- 57
(1-3/4 --- 2-1/4)
L
2.3 --- 2.5
(0.090 --- 0.099)
d
20
(0.787)
D
2
D
1
61.5
(2.421)
118
(4.645)
H
Fig. 3 Dimensions of sheet-collated nails
45 --- 65
(1-3/4 --- 2-1/2)
65 --- 75
(1-1/2 --- 3)
L
2.5 --- 2.9
(0.099 --- 0.113)
3.1 --- 3.3
(0.120 --- 0.131)
d
Type
B
A
0.7
(0.028)
121
(4.764)
19
(0.748)
28
(1.102)
37.5
(1.476)
d1
D2L1
L2
D1
72
(2.835)
80
(3.150)
H
--- 5 ---
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 3.3 mm dia. x 75 mm length (0.131" x 3") into a workpiece of hemlock with the
Model NV 75AG, a pressure of about 8 bar (8.2 kgf/cm2, 116 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
2.3 x 45 mm (.090 x 1-3/4")
3.3 x 75 mm (.131 x 3")
Size of nail mm (in)
Required nailing energy Nailer output energy
Hemlock
R
NV 83A
NV 75AG
NV 65AH
--- 6 ---
6. COMPARISONS WITH SIMILAR PRODUCTS
Maker and model
Air consumption
at 7 kgf/cm
2
(100 psi)
Operating pressure
Direction change of
exhaust air
Driving depth
adjustment mechanism
Magazine type
(Material)
Tool not required
Weight
Dimensions
(L x H x W)
5
---
8.5 kgf/cm
2
(70
---
120 psi)
271 mm x 338 mm x 132 mm
(10-11/13" x 13-5/16" x 5-3/16")
HITACHI
NV 75AG
1.8 ltr/cycle
(0.064 ft
3
/cycle)
200
---
300 nails
Top loading
(Black plastic)
Nail capacity
2.5 kg (5.5 lbs.)
Tool not required
290 mm x 348 mm x 137 mm
(11-13/ 32" x 1 3-1 1/16" x 5-13/32")
2.5 ltr/cycle
(0.088 ft
3
/cycle)
Bottom loading
(Black plastic)
3.5 kg (7.7 lbs.)
266 mm x 300 mm x 128 mm
(10-1/2" x 11-13/16" x 5-1/16")
1.4 ltr/cycle
(0.049 ft
3
/cycle)
Bottom loading
(Clear plastic)
2.1 kg (4.6 lbs.)
Power ratio
Length
Applicable
nails
Diameter
Collation
45 mm -- 75 mm
(1-3/4" -- 3")
Wire
50 mm -- 83 mm
(2" -- 3-1/4")
130
200
---
300 nails
200
---
300 nails
200
---
350 nails
Top loading
(Black plastic)
Tool not required
Tool required
Tool not required
None
Tool not required
Tool required
Wire
45 mm -- 57 mm
(1-3/4" -- 2-1/4")
2.5 mm -- 3.3 mm
(0.099" -- 0.131")
2.3 mm -- 2.5 mm
(0.090" -- 0.099")
2.3 mm -- 2.5 mm
(0.090" -- 0.099")
2.5 mm -- 3.3 mm
(0.099" -- 0.131")
2.5 mm -- 2.9 mm
(0.099" -- 0.113")
38 mm -- 65 mm
(1-1/2" -- 2-1/2")
38 mm -- 57 mm
(1-1/2" -- 2-1/4")
50 mm -- 70 mm
(2" -- 2-3/4")
5
---
8.5 kgf/cm
2
(70
---
120 psi)
5
---
8.5 kgf/cm
2
(70
---
120 psi)
5
---
7.0 kgf/cm
2
(70
---
100 psi)
3.6 kg (7.9 lbs.)
3.1 ltr/cycle
(0.109 ft
3
/cycle)
Wire Sheet
Wire Sheet
324 mm x 318 mm x 141 mm
(12- 25/ 32" x 1 2-17/32" x 5-9/ 16 " )
HITACHI
NV 65AH
HITACHI
NV 83A
R
100
200
200
--- 7 ---
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Model NV 75AG 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 75AG 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.
The U.S.A:
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
--- 8 ---
7-4. 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 75AG within the range from 5 kgf/cm2 (70 psi, 4.9 bar) to 8.5 kgf/cm
2
(120 psi, 8.3 bar). Otherwise, ill effect may be given to the performance, service life and safety of the Model
NV 75AG. (Be sure to install a regulator when using a high-pressure air compressor whose set pressure is
10 kgf/cm2 (140 psi, 9.8 bar) or more. In this case, adjust the air pressure at 8.5 kgf/cm2 (120 psi, 8.3 bar) or
less.)
(2) If dust in the compressed air settles on the sliding portion, the Model NV 75AG will not operate properly.
Lubrication is effective to remove dust and also to prolong the service life of the Model NV 75AG keeping good
performance. It is recommended to lubricate the Model NV 75AG daily. Supply 5-10 drops of lubricant into
the air plug on the Model NV 75AG.
When not in use for an extended period, supply lubricant and perform idle driving two or three times to
lubricate the inside, then apply a thin coat of the 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 75AG due to rusting.
(4) Instruct the customers (especially the heavy users) to perform inspection and maintenance securely.
Type of oil
Hitachi Pneumatic Tool Lubricant
Brand or product name
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)
--- 9 ---
8. MECHANISM AND OPERATION PRINCIPLE
8-1. Mechanism
As illustrated in Fig. 7, the Model NV 75AG can be generally divided into four sections:
Output section, control valve section, driving section and magazine section.
The parts of the output section and the control valve section are the same as those of the Model NR 65AK to
allow the use of nails 75 mm (3") long, though the basic construction is the same as the Model NV 65AH.
The parts of the driving section and the magazine section have been newly designed.
Primary differences from the Model NV 65AH are described below.
Output section
...................
To make it powerful, the output section is common to the Model NR 65AK except
the following:
Body: There is no interchangeability with the Model NR 65AK since the Model
NV 75AG has an air passage to feed nails. The handle is equipped with
the grip rubber (rubber-ring type) instead of the grip tape. (Note that the
repair part is the conventional grip tape because the grip rubber cannot
be replaced by hand.)
Cylinder: Newly designed.
Piston: Newly designed.
Dust filter: Dust filter is provided between the air inlet cap and the body to
prevent dust from entering the inside (common to the Model
NR 90AC2).
Gasket (B): The shape is changed to install the dust filter (common to the Model
NR 90AC2).
Control valve section
..........
The control valve section is common to the Model NR 65AK except the following:
Plunger spring: Common to the Model NV 65AH.
Trigger: Newly designed.
Driving depth adjuster: Located near the trigger to simplify the nose unit.
The tip of the nose is easy to see and operate.
Driving section and magazine section
.............
The parts of the driving section and the magazine section have
been newly designed.
--- 10 ---
Control valve section
Trigger [39]
Head
Valve (A) [10]
Exhaust
Cover [5]
Top Cover [3]
Plunger
Spring [58]
Exhaust
vent
Piston
Bumper
[20]
Cylinder [15]
Piston (H)
(Driver blade)
[17]
Accumulator
Cap [34]
Feeder [28]
Nose [22]
Dust Filter [33]
Control valve section
Body [18]
Grip rubber
Adjuster [44]
Valve Bushing
(B) [53]
Valve Bushing
(A) [61]
Plunger (A) [59]
Valve Piston (B) [57]
Pushing
Lever (A)
[31]
Nail Holder [81]
Magazine (A) [75]
Guide Lock [87]
Nail Guide [89]
Cover [95]
Magazine Cover (A) [78]
Magazine section
Section A - A
Feeder Piston [64]
Feed Spring [65]
Nail Guide [89]
Feeder [28]
Fig. 5 Construction
Driving section
Output section
--- 11 ---
Body [18]
Dust Filter [33]
Gasket (B) [32]
Cylinder [15]
Plunger Spring [58]
Trigger [39]
Part NV 75AG NR 65AK
8-2. Interchangeability of Parts
The driving section and the magazine section of the Model NV 75AG have been newly designed and there is no
interchangeability with those of the Model NR 65AK. Although most parts of the output section and the control
valve section of the Model NV 75AG are interchangeable with those of the Model NR 65AK, there is no
interchangeability for the parts shown in the table below.
Bore diameter
is concaved.
Plunger (A)
Color: Black
Viewed from "A"
Air passage hole to
feed nails (3 mm dia.)
Upper end surface of
the cylinder
Dust Filter [33]
Grip rubber
Gasket (B) [32]
Viewed from "A"
Gasket (B)
Grip Tape (A)
Color: Yellow
Color: Silver
Color: Black
Plunger (A)
Upper end surface
of the cylinder
A
A
--- 12 ---
(1) Prior to nailing (see Fig. 6)
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. 7)
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.
8-3. 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. 6 Prior to nailing
Air supply vent
Fig. 7 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)
--- 13 ---
(3) During nailing (II) (see Fig. 8)
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. 9)
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. 8 During nailing (II)
[Return air
chamber]
Piston
Head valve spring
Head valve
Cylinder
Air passage (A)
Fig. 9 During return
Feed piston
Nail feeder
Air passage (C)
Feed piston
Feed spring
Plunger (A)
Trigger
Valve piston
Air supply vent
[Accumulator]
--- 14 ---
Deburr 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
fatigued).
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
correctly 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.
--- 15 ---
Replace the piston O-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-rings.
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 O-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.
--- 16 ---
Set the adjuster to the
optimum position.
Replace the part.
Cylinder inside surface is
abnormal (packed with
dust, or worn).
Head valve sliding surface
is abnormal (seized or
damaged, or lubrication is
needed).
Head valve spring is
abnormal (fatigued or
damaged).
<Control valve section>
Plunger (A), valve piston
(B), valve bushing (A) or
valve bushing (B) is
abnormal (seized or
damaged).
O-rings or sliding surface
are worn or needs
lubrication.
Adjuster is raised too high
for short nails.
Nails are not completely fed
into the injection port.
Unspecified nails are used.
Remove dust and then
lubricate.
Replace the part.
Replace the part.
Apply grease.
Check that the adjuster is
not raised too high.
See item 1).
Problem
Possible cause
( : Most-common cause)
Inspection method Remedy
1) Nails cannot
be driven.
(continued)
Workpiece is too hard. Nailer cannot be used
because the material is
beyond its applicable range.
Check if a nail is bent even
when driven into soft wood.
Check that the driver blade
tip is not abnormally worn.
Replace the abnormal part.
Turn the adjuster lower
(lower the pressure).
See item 1).
Driver blade is worn.
Replace the part.
Adjust the air pressure to
5 --- 8.5 kgf/cm2 (4.9 --- 8.3
bar, 70 --- 120 psi).
Nailer cannot be used
because the material is
beyond its applicable range.
Check that nails can be
driven at 5 kgf/cm2 (4.9 bar,
70 psi).
Perform idle driving to
check the driving
operation.
Perform idle driving to check
that the driver blade is not
held in the down position.
Disassemble the control
valve section and check the
O-rings.
Replace the abnormal part.
Apply grease.
2) Nails are
driven but
bent.
3) Nails cannot
be driven into
the workpiece
completely:
the heads
cannot be
made flush.
Adjuster is incorrectly set.
Air pressure is too low.
Workpiece is too hard.
Turn the adjuster to the
lowest position and then
drive nails.
Check if a nail is bent even
when driven into soft wood.
--- 17 ---
Check the sliding surface for
abnormality and lubrication.
Replace the part.
Replace the abnormal part.
Driver blade is worn.
Piston O-ring is abnormal
(worn or damaged).
Cylinder inside surface is
abnormal (worn or rough).
Perform idle driving to check
the driver blade is projected
from the nose tip.
Problem
Possible cause
( : Most-common cause)
Inspection method Remedy
3) Nails cannot
be driven into
the workpiece
completely:
the heads
cannot be
made flush.
(continued)
4) Nails jam.
<Nails>
Unspecified nails are used.
Abnormal nails are mixed.
Nail heads are too large or
too small.
[Wire-collated nails]
Collating wires are abnormal
(broken, welding failed,
deformed or welding
position failed).
Collating wires are
deformed (deformed in
collation angle or collation
pitch).
[Sheet-collated nails]
Collating sheets are
abnormal (deformed or
broken).
Nails are removed from the
sheets.
Use specified nails.
Remove the abnormal nails
and load the nailer with
proper nails.
Check if the specified nails
are used.
Check the nails as follows.
Head valve sliding surface is
abnormal (seized or
damaged, or lubrication is
needed).
Disassemble the output
section and check the
piston ring and the inside of
the cylinder for abnormality.
Replace the abnormal part.
Apply grease.
[Wire-collated nails]
[Wire-collated nails]
Type
L
1
d
2.5
(0.099)
A
3.3
(0.131)
19
(0.748)
37.5
(1.476)
L
2
B
D
6 --- 7.2
(0.236 --- 0.283)
[Sheet-collated nails]
[Sheet-collated nails]
dD
5.7 --- 6.0
(0.224 --- 0.236)
2.3 --- 2.5
(0.090 --- 0.099)
Unit: mm (inch)
Unit: mm (inch)
--- 18 ---
<Driver blade is not returned
completely.>
See item "1) Output
section: piston, driver
blade, etc.".
Air pressure is too high.
Problem
Possible cause
( : Most-common cause)
Inspection method Remedy
<Body: Nail feeding is
incomplete.>
Feeder is worn and the
sliding section is abnormal.
Nail guide face of the nose
or the sliding section of the
feeder is abnormal
(deformed, burrs or
damaged).
Feed spring or feeder spring
is abnormal (damaged,
fatigued or removed).
4) Nails jam.
(continued)
Open the nail guide and
check the position of the
feeder claw.
Replace the abnormal part.
<Body: Nail guide section>
Nail guide section is
abnormal.
See item "1) Nail guide
section".
Perform idle or actual
driving to check if the driver
blade is returned
completely.
Nails may be jammed if
driven at a high pressure
and high speed. Check
pressure and driving speed.
See item "1) Nail guide
section".
See item "1) Output section:
piston, driver blade, etc.".
Adjust the air pressure to
5 --- 8.5 kgf/cm2 (4.9 --- 8.3
bar, 70 --- 120 psi).
--- 19 ---
9-2. Possible Causes and Corrections of Air Leakage
Air leakage repair location
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 or damage.
(3) And then, check other places.
(A)
(B)
e
f
g
d
c
b
h
(E)
(D)
(C)
(G)
a
Control valve section
(H)
Nail feeder section
(G)(F)
(F)
--- 20 ---
Looseness of the Hex. Socket Hd.
Bolt M5 x 35 [4]
Damage of Gasket (B) [6]
Abnormality in the sealed face of the
Body [18], the Exhaust Cover [5] and
the Cylinder [15]
Air leakage portion
(A) Exhaust port
Cause
When the Trigger is turned off
When the Trigger is turned on
Abnormality in Head Valve (A) [10]
and Cylinder [15] [Wear and
deformation of the sealed face of the
(b) section]
Abnormality in Head Valve O-ring
(P-22) [9] or wear, deformation and/
or breakage of Head Valve (A) [10]
Abnormality (damage) in the Exhaust
Cover [5]
Abnormality in Head Valve (A) [10]
[Wear, deformation and/or breakage
of the section (a)]
* Abnormality in the inner face [the
section (a)] in the Exhaust Cover [5]
[Deformation and dust clogging in
the section (a)]
(B) Exhaust cover
(C) Nose 1
(Feed piston passage)
Looseness of the Nylock High
Tension Bolt M6 x 20 [23]
Scratched and/or the broken O-ring
(P-4) [21]
Abnormality in the sealed faces of
the Body [18] and the Nose [22]
(D) Nose 2
*Abnormality (breakage and/or
scratches) in O-Ring (S-70) [11] of
the Cylinder Plate [12]
Abnormality in the sealing faces [the
sections (c) and/or (d)] of the
Cylinder Plate [12], Body [18] and/or
the Cylinder [15]
Abnormality [deformation, crack
and/or damage of the sections (e)
and (f)] in the Piston Bumper [20]
Deformation of Piston (H) [17]
(The deformation of driver blade
abnormality in sealed faces)
The deformation of the face (f) of the
Body [18]
Abnormality (wear, deformation,
breakage and/or scratches) in
O-Ring (S-46) [13]
(E) Feed piston
Abnormality (wear, breakage and/or
scratches) in O-ring (P-21) [63] of the
Feed Piston [64], or the wear and/or
deformation of the Nose [22] on the
sliding face
Abnormality (wear, breakage and/or
scratches) in O-ring (P-9) [62] of the
Nose [22], or wear, deformation
and/or scratches of the Feed Piston
[64] on the sliding face
Abnormality (wear, breakage and/or
scratches) in O-ring (S-4) [48] of
Valve Piston (B) [57]
Abnormality (wear, breakage and/or
scratches) in O-ring (I.D 8.8) [55]
(lower side) of Valve Piston (B) [57]
Abnormality (breakage and/or
scratches) in O-ring (S-18) [54] of
Valve Bushing (B) [53]
* Abnormality in the inner face [the
section (h)] of the valve chamber of
the Body [18]
(F) Control valve 1
Abnormality (wear, breakage and/or
scratches) in O-ring (I.D 8.8) [55]
(upper side) of Valve Piston (B) [57]
Abnormality (breakage and/or
scratches) in Head Valve O-ring (I.D
16.8) [52] of Valve Bushing (B) [53]
* Abnormality in the upper face [the
section (g)] of the valve chamber of
the Body [18]
--- 21 ---
Loosen Hex. Socket Hd. Bolt M5 x 16 [35].
Broken Gasket (B) [32]
Defective seal surface of the Body [18] or Cap [34]
Air leakage portion
Cause
When the Trigger is turned off
When the Trigger is turned on
(G) Control valve 2
(H) Cap
Abnormality (wear, breakage and/or
scratches) in O-ring (I.D 1.8) [60] of
Plunger (A) [59]
Abnormality (deformation and/or
scratches of the sliding face of
Plunger (A) [59] in Valve Bushing (A)
[61]
Abnormality (wear, breakage and/or
scratches) in O-ring (I.D 11) [56] in
the inside of Valve Piston (B) [57]
Abnormality (deformation and/or
scratches of the sliding face of
Plunger (A) [59] in Valve Piston (B)
[57]
--- 22 ---
16.2 1.5 (165 15, 11.9 1.1)
Tightening torque
N•m (kgf•cm, ft-lbs)
9.8 0.78 (100 8, 7.2 0.6)
6.3 0.5 (65 5, 4.7 0.4)
8.3 0.5 (85 5, 6.2 0.4)
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 (Nippeco SEP-3A, Code No. 930035) 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
1 oz (30 cc) Oil feeder (Code No. 877153)
4 oz (120 cc) Oil feeder (Code No. 874042)
1 quart (1 ltr) Can (Code No. 876212)
If Gasket (B) [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.
Tightening torque for each part
Bolt, screw and cap
Nylock High Tension Bolt M6 x 20................................. [23]
Hex. Socket Hd. Bolt M6 x 12 ....................................... [1]
Hex. Socket Hd. Bolt M5 x 16 ....................................... [35]
Nylock Hex. Socket Hd. Bolt M4 x 12 ........................... [97]
Hex. Socket Hd. Bolt M5............................................... [4] [86]
Machine Screw (W/Washer) M5 x 30............................ [37]
2.0 0.5 (20 5, 1.5 0.4)
4.4 0.3 (45 3, 3.3 0.2)
Make sure there is no fragment of the Piston Bumper [20] on the passage of the Body [18] and Nose [22]
before replacing the Piston Bumper [20].
--- 23 ---
[Tool required]
Hex. bar wrench (4 mm)
(a) Disassembly
Remove the Hex. Socket Hd. Bolts M6 x 12
[1] with a hex. bar wrench (5 mm). Then
the Top Cover [3] can be removed.
Remove the four Hex. Socket Hd. Bolts
M5 x 35 [4] with a hex. bar wrench (4 mm)
and remove the Exhaust Cover [5]. Then
the components of the output section such
as Piston (H) [17], Cylinder [15] and the
Piston Bumper [20] can be removed.
(b) Reassembly
Disassembly procedures should be
followed in the reverse order. Note the
following points:
Apply grease to the inside of the O-ring (I.D
37) [16], O-ring (S-70) [11], O-ring (S-46)
[13] and the Cylinder [15] before
reassembly.
Mount Gasket (B) [6] aligning the 6 mm
(0.236") dia. hole with the blowhole of the
Body [18].
10-2. Disassembly and Reassembly of the Output Section (See Fig. 10)
Hex. Socket Hd.
Bolt M6 x 12 [1]
Plate [2]
Head Bumper [7]
Gasket (B) [6]
Exhaust Cover [5]
Top Cover [3]
Hex. Socket Hd.
Bolt M5 x 35 [4]
Head Value Spring [8]
Head Valve (A) [10]
O-Ring (P-22) [9]
O-Ring (S-70) [11]
Cylinder Plate [12]
O-Ring (S-46) [13]
O-Ring (1AP-48) [14]
Cylinder [15]
Piston Bumper [20]
6 mm (0.236")
hole
Fig. 10 Disassembly and reassembly of the output section
Blowhole
Body [18]
Piston (H) [17]
O-Ring (I.D 37) [16]
--- 24 ---
Top Cover [3]
Groove of the
Exhaust Cover [5]
O-Ring (P-22) [9]
Head Valve (A) [10]
Fig. 13
Exhaust Cover [5]
B
A
C
Apply grease to the sliding surface of
the Exhaust Cover [5] and Head Valve (A)
[10] and charge about 0.5 g (0.018 oz) of
grease in the groove of the Exhaust Cover
[5] (Fig. 13).
Apply grease to the lip portions and
of Head Valve (A) [10] (Fig. 21).
Apply grease to O-Ring (P-22) [9]. Mount
O-Ring (P-22) [9] to Head Valve (A) [10],
then mount it to the Exhaust Cover [5].
C
A
B
Mount the Cylinder Plate [12] to the
Cylinder [15] facing the stopper of the
Cylinder Plate [12] to the Piston Bumper
[20]. When mounting to the Body [18],
fit the rib of the Body [18] into the stopper
groove of the Cylinder Plate [12] (Figs. 11
and 12).
Fig. 12
Stopper of the
Cylinder Plate [12]
Rib of the Body [18]
Fig. 11
--- 25 ---
10-3. Disassembly and Reassembly of the Control Valve Section (See Fig. 14)
[Tools required]
Roll pin puller (3 mm (0.118 ") dia.)
O-Ring (S-18) [54]
Body [18]
O-Ring (I.D 11) [56]
Valve Piston (B) [57]
Plunger Spring [58]
Plunger (A) [59]
O-Ring (I.D 1.8) [60]
Valve Bushing (A) [61]
O-Ring (I.D 8.8) [55]
Valve Bushing (B) [53]
Head Valve O-Ring (I.D 16.8) [52]
Roll Pin D3 x 28 [38]
O-Ring (S-4) [48]
Roll Pin D3 x 28 [38]
(a) Disassembly
Pull out the Roll Pin D3 x 28 [38] with the roll
pin puller (3 mm (0.118") dia.), remove the
Pushing Lever Guide [40], and the Trigger [39]
can be removed.
Trigger [39]
Pushing Lever
Guide [40]
Fig. 14
--- 26 ---
Wire with 1.5 to 3 mm dia.
(0.059" to 0.118")
Valve Bushing (B) [53]
Fig. 16
Hole
Pull out the Roll Pin D3 x 28 [38] with the roll
pin puller (3 mm (0.118") 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. 15, put a 4 to 5 mm (0.157 to
0.197") dia. bar in from the upper side of the
Body [18] and push the top of Valve
Piston (B) [57]. Now, the parts forming the
control valve can be taken out except Valve
Bushing (A) [61] and Head Valve O-Ring
(I.D 16.8) [52].
[CAUTIONS]
Be careful not to damage Valve Piston (B)
[57], Valve Bushings (A) [61] and (B) [53], etc.
Do not pull out the end of Plunger (A) [59]
with pliers.
3) To take out Valve Bushing (B) [53], put a 1.5 to
3 mm (0.059" to 0.118") 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) [53],
as shown in Fig. 16.
Be careful not to
damage the internal
surface.
Valve Bushing
(B) [53]
Plunger (A) [59]
Push
Head Valve
O-Ring (I.D 16.8)
[52]
4 to 5 mm (0.157" to 0.198")
dia. bar
Body [18]
Valve Bushing (A) [61]
Valve Piston (B) [57]
Fig. 15
When disassembling,
do not pull out this
part by gripping it
with pliers.
--- 27 ---
(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) [60] on Plunger (A) [59], O-Rings (I.D 11) [56], (S-18) [54]
and (S-4) [48] on Valve Piston (B) [57], and the shaft of Plunger (A) [59] as shown in Fig. 17.
As shown in Fig. 17, install Valve Bushing (A) [61] so that the roll pin groove in Valve Bushing (A) [61] will be
aligned with the roll pin hole in the Body [18]. First, insert a roll pin puller (3 mm (0.118") dia.) into the roll pin
hole. Then, upon confirming that the puller passes through the hole, drive in the Roll Pin D3 x 28 [38].
If an attempt is made to drive the roll pin with force when the roll pin groove in Valve Bushing (A) [61] is not
aligned with the roll pin hole in the Body [18], it will damage the periphery of Valve Bushing (A) [61] and
prevent disassembly or reassembly.
After assembling, check that Plunger (A) [59] moves smoothly.
Fig. 17
Plunger (A) [59]
Valve Bushing (A) [61]
Valve Bushing (A) [61]
Roll pin
groove
Coat the O-ring
groove's shaft
with grease.
Roll Pin D3 x 28 [38]
Body [18]
Apply grease to the stem.
Roll pin hole
--- 28 ---
10-4. Disassembly and Reassembly of the Magazine Section
Tools required Phillips screwdriver
Roll pin pullers (4 mm dia., 2.5 mm dia.)
Hex. bar wrench (4 mm)
Wrench M5
(1) Disassembly and reassembly of the magazine section
(a) Disassembly (See Fig. 19.)
Loosen the Hex. Socket Hd. Bolt M5 x 20 [86] and the Nylon Nut M5 [69] then remove the Sleeve [70].
Deform Pushing Lever Cover (A) [71] using a flat-blade screwdriver and disengage it from the Nose [22].
Loosen the Machine Screw (W/Washers) M5 x 30 (Black) [37] of the Body [18]. Then the Magazine Ass'y
[98] can be removed.
Engaged.
Deform Pushing Lever Cover (A)
by inserting a flat-blade screwdriver.
Fig. 18
--- 29 ---
(b) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Bend the tip of the Cover [95] and engage it with the convex portion of Magazine (A) [75]. Hold it with
Pushing Lever Cover (A) [71] positioning the Cover [95] outside Pushing Lever Cover (A) [71].
Feeder Shaft Ring [77]
Protector (B) [72]
Nylon Nut M5 [69]
Sleeve [70]
Pushing Lever Cover (A) [71]
Machine Screw (W/Washers)
M5 x 30 (Black) [37]
Pin [76]
Nylon Nut M5 [69]
Concave portion
Magazine (A) [75]
Pin [76]
Magazine
Cover
(A) [78]
Hex. Socket Hd. Bolt
M5 x 20 [86]
Holder Cap (A) [79]
Spring [84]
Roll Pin D2.5 x 12 [82]
Holder Shaft
(A) [83]
Nail Holder [81]
O-ring (P-9) [62]
Ratchet Spring [80]
Fig. 19 Disassembly and reassembly of the magazine section
Fit the hole of the
Cover [95] beween the convex portion of
Magazine (A) [75] and the concave
portion of Pushing Lever Cover (A) [71].
Body [18]
--- 30 ---
(2) Disassembly and reassembly of nail holder, holder shaft, etc.
(a) Disassembly
Pull out the two Pins [76] with a roll pin puller (4 mm dia.). Then Magazine (A) [75] and Magazine Cover
(A) [78] can be removed. Remove Holder Cap (A) [79] and Roll Pin D2.5 x 12 [82] with a roll pin puller
(2.5 mm dia.) Then O-ring (P-9) [62], Nail Holder [81], Holder Shaft (A) [83] and Spring [84] can be
removed.
(b) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Mount O-ring (P-9) [62] to the top groove of Holder Shaft (A) [83].
When mounting Holder Shaft (A) [83] to Magazine (A) [75], check that the Spring [84] is inserted
between the concave portion of Magazine (A) [75] and the convex portion of Holder Shaft (A) [83] and
then insert the Pin [76]. (See Fig. 20.)
Check that the Feeder Shaft Rings [77] (2 pcs.) are securely inserted into the grooves of the Pins [76]
(2 pcs.) . Be careful not to lose the Feeder Shaft Ring [77].
Check the following after reassembly:
The Nail Holder [81] tilts when opening Magazine Cover (A) [78].
The Nail Holder [81] housed in Magazine (A) [75] smoothly when closing Magazine Cover (A) [78].
Convex portion of
Holder Shaft (A) [83]
Concave portion of
Magazine (A) [75]
Spring [84]
Nail Holder [81]
Pin [76]
Fig. 20
--- 31 ---
10-5. Disassembly and Reassembly of the Driving Section
Fig. 21 Disassembly and reassembly of the driving section
Bumper [66]
Feed Piston Cover [67]
Feed Spring [65]
Nose [22]
Nylock High Tension
Bolt M6 x 20 [23]
Roll Pin D4 x 16 [25]
Pushing Lever Cover (B) [30]
Feeder Arm (B) [26]
Body [18]
O-ring (S-46) [13]
Pushing Lever Spring [41]
Pushing Lever (A) [31]
Pushing Lever (C) [42]
Adjuster [44]
Piston Bumper [20]
Feed Piston [64]
O-ring (P-4) [21]
Plunger (B) [24]
Feeder Spring [27]
Feeder [28]
Roll Pin D2 x 16 [43]
Adjuster Spring [45]
Adjsuter Plate (B) [46]
Adjsuter Plate (A) [47]
O-Ring (S-4) [48]
Pushing Lever (B) [49]
Retaining Ring (E-type)
for D3 Shaft [51]
O-ring (S-5) [50]
O-ring (P-9) [62]
O-ring (P-21) [63]
Retaining Ring for
D28 Hole [68]
--- 32 ---
(2) Disassembly and reassembly of the adjuster unit
(a) Disassembly (See Fig. 23.)
Remove the Retaining Ring (E-type) for D3 Shaft [51]. Then Pushing Lever (A) [31], Pushing Lever Cover
(B) [30] and the adjuster unit can be removed.
Pull out the Roll Pin D2 x 16 [43]. Then the adjuster unit can be disassembled.
(b) Disassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Mount Adjuster Plate (A) [47] facing its bent portion toward the Adjuster [44].
Mount Adjuster Plate (B) [46] facing its convex portion toward Adjsuter Plate (A) [47].
(1) Disassembly and reassembly of Nose [22], Pushing Lever (A) [31] and other parts
(a) Disassembly (See Figs. 21 and 22.)
Remove the four Nylock High Tension Bolts M6 x 20 [23]. Then the Nose [22], Pushing Lever (A) [31] and
other parts can be removed.
(b) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Apply grease to the O-ring (S-46) [13] and mount it in the groove of the Nose [22].
Align the bent portion of Adjuster Plate (A) [47] with the concave portion of the Pushing Lever Guide [40].
After reassembly, check the components of the pushing lever and the Adjuster [44] move smoothly.
Fig. 22
Pushing Lever Guide [40]
Bent portion of Adjuster
Plate (A) [47]
Adjuster [44]
Align the positions.
--- 33 ---
Fig. 23
Adjuster [44]
Adjuster
Spring [45]
Adjuster Plate (B) [46]
(3)
Disassembly and reassembly of Piston Bumper [20], Feeder [28], Feed Piston [64] and other parts. (See Fig. 24.)
(a) Disassembly
Remove the Nose [22] and the parts forming the pushing lever from the output section in accordance with
the procedure in 10-5 (1). Then the Piston Bumper [20] can be removed.
Holding the Feed Piston Cover [67] with fingers, remove the Retaining Ring for D28 Hole [68] with a
retaining ring puller. Then the Feed Piston Cover [67], Bumper [66] and Feed Spring [65] can be removed.
Pull out the Roll Pin D4 x 16 [25] with a roll pin puller (4 mm dia.). Then the Feed Piston [64] and Feeder
Arm (B) [26] can be removed.
Push out Plunger (B) [24] with a roll pin puller (4 mm dia.). Then the Feeder Arm (B) [26], Feeder [28] and
Feed Spring [65] can be removed.
(b) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Before replacing the Piston Bumper [20], clean the passages of the Body [18] and the Nose [22]
(Fig. 24) and the inside of the feed piston chamber (Fig. 25). If clogged with fragments of the Piston
Bumper [20], the Feed Piston [64] will not work properly.
Fig. 25
Roll Pin D4 x 16 [25]
Body [18]
O-Ring (P-21) [63]
Nose [22]
Split
Piston Bumper [20]
Feed piston chamber
Bent portion
Bent portion
Convex portion
Adjuster Plate (A) [47]
Feeder Arm (B) [26]
Apply grease to the O-ring (P-9) [62] and O-ring (P-21) [63] and then assemble them.
Fill the grease with the groove of the Feed Piston [64] as shown in Fig. 25.
Passage
Passage
O-ring
(P-4) [21]
Groove
Groove
O-ring (P-9) [62]
"A" groove
Fig. 24
--- 34 ---
Apply grease to the O-ring sliding surface of the Feed Piston [64] and the Nose [22]. However, be careful
not to apply too much grease to the "A" surface shown in Fig. 25. Otherwise, the Feed Piston [64]
operates improperly at the low pressure.
Mount the Roll Pin D4 x 16 [25] facing its split toward the magazine as shown in Fig. 25. The amount of
protrusion at both ends must be equal after reassembly (amount of protrusion: 1.5 mm).
Check that the Retaining Ring for D28 Hole [68] is securely inserted into the groove of the Nose [22].
(4) Disassembly and reassembly of Nail Guide [89], Nail Stopper (A) [90], Nail Stopper (B) [92] and other parts
(See Fig. 26.)
Tools required: Flat-blade screwdriver
Hex. bar wrench 3 mm
(a) Disassembly
Remove the Shaft Ring [85] from the Nail Guide Shaft [29] with a flat-blade screwdriver and remove the
Nail Guide Shaft [29]. Then the Nail Guide [89] and other parts can be removed in an assembly.
Remove the Nylock Hex. Socket Hd. Bolt M4 x 12 [97] with a hex. bar wrench 3 mm. Then the Nail Guide
Cover [94], Stopper Spring (A) [91], Stopper Spring (B) [93] and Cover [95] can be removed.
Remove the Shaft Ring [85] from the Guide Lock [87] with a flat-blade screwdriver and pull out the Guide
Lock [87]. Then Nail Stopper (A) [90] and Nail Stopper (B) [92] can be removed.
Nose [22]
Shaft Ring [85]
Cover [95]
Nail Guide Cover [94]
O-ring (P-4) [21]
Nail Guide Shaft [29]
Nylock Hex. Socket Hd. Bolt M4 x 12 [97]
Sleeve (B) [96]
Shaft Ring [85]
Stopper Spring (B) [93]
Nail Stopper (B) [92]
Stopper Spring (A) [91]
Nail Stopper (A) [90]
Guide Lock [87]
Nail Guide [89]
Spring [88]
Fig. 26 Disassembly and reassembly of nail guide, nail stopper (A), nail stopper (B) and other parts
--- 35 ---
(b) Resassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Before reassembly, remove dust from the groove of the Nail Guide [89].
Fit the convex portions of Nail Stopper (A) [90] and Nail Stopper (B) [92] in the Stopper Spring (A) [91]
and Stopper Spring (B) [93] securely. Be careful not to mistake Stopper Spring (A) [91] for Stopper
Spring (B) [93].
After reassembly, push Nail Stopper (A) [90] and Nail Stopper (B) [92] with fingers to check that they
smoothly return to position.
Mount the Nail Guide Shaft [29] facing its chamfered side upward.
Bend the tip of the Cover [95] and engage it with the convex portion of Magazine (A) [75]. (See Fig. 19.)
10-6. Grip Rubber
The Model NV 75AG is equipped wih the grip-rubber handle that is common to the Model NR 83AA2. However,
the grip rubber is not supplied as a spare part because it is difficult to detach/attach the grip rubber. If
replacement of the grip rubber is required, replace the Body [18] or attach the grip tape.
How to attach the grip tape and the fixing tape
Grip tape (A): Code No. 881768
Fixing tape: Code No. 880407
Grip tape (A) and the fixing tape are adhesive-backed. Start wrapping grip tape (A) near the roll pin hole of the
body and wrap around the body completely. After wrapping, fix grip tape (A) with the fixing tape at both ends of
wrapping (Fig. 27). Note that grip tape (A) and fixing tape cannot be removed once they are adhered.
Fig. 27
Roll pin hole
Grip tape (A)
End of grip tape (A)
Fixing tape
Body
End of grip tape (A)
Fixing tape
Wrapping amount: 1.5 mm to 3 mm
--- 36 ---
11. INSPECTION AND CONFIRMATION AFTER REASSEMBLY
Check that Plunger (A) [59] moves smoothly.
Check that there is no air leakage from each part.
While driving nails with an air pressure of 4.5 kgf/cm2 (63 psi), check that there is no idle driving and bending
of nails.
Note: Before conducting the driving test, turn Adjuster [44] to the deepest position.
Recheck the tightening torque of each screw.
Check that Pushing Lever (A) [31] slides smoothly.
Check that the machine will not operate only by pulling the Trigger [39]. Also check that the machine will not
operate only by depressing Pushing Lever (A) [31].
Push Nail Stopper (A) [90] and Nail Stopper (B) [92] with fingers to check that they smoothly return to position.
Check that the Feed Piston [64] operates properly at 5 kgf/cm2 (70 psi. 4.9 bar) (Open the Nail Guide [89] and
perform idle driving.).
Check that the Trigger [39] moves smoothly.
Check that the Adjuster [44] turns smoothly.
--- 37 ---
Valve
Bushing (A)
Plunger (A)
Plunger Spring
Valve Piston (B)
Valve Bushing
(B)
O-ring x 7
Piston (H)
O-ring
Pushing Lever
(A)
Pushing Lever
Cover (B)
Adjuster
Pushing
Lever (B)
Pushing
Lever Spring
Pushing
Lever Guide
O-ring x 2
12. STANDARD REPAIR TIME (UNIT) SCHEDULES
MODEL 10 20 30 40
Fixed
Variable
NV 75AG
Work Flow
Exhaust Cover
Top Cover
Packing (B)
Head Bumper
Head Valve
Spring
O-ring x 2
Head Valve (A)
60 min.
50
Cylinder Plate
Cylinder
Piston Bumper
O-ring x 3
General Assembly
Feeder Arm (B)
Feeder
Feeder Spring
Nose
Nail Guide
Nail Stopper (A)
Nail Stopper (B)
Guide Lock
Magazine Ass'y
Body
Feed Piston
O-ring x 2
Feed Spring
Damper
Feed Piston
Cover
Adjustment
(Cylinder, Body,
Valve)
PNEUMATIC TOOL PARTS LIST
LIST NO.
COIL NAILER
Model NV 75AG
2002• 8 •30
(E1)
E006
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
13
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
38
38
39
21
501
502
503
504
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
48
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
69
75
76
77
76
78
77
79
80
81
62
82
83
84
85
86
87
88
89
90
91
92
93
85
94
95
96
97
98
62 74
84
*
ALTERNATIVE PARTS
--- 2 ---
ITEM
NO.
CODE NO.
DESCRIPTION REMARKS
NO.
USED
PARTS
8 -- 02
NV 75AG
1 949-657 HEX. SOCKET HD. BOLT M6X12 (10 PCS.) 1
2 880-515 PLATE 1
3 880-514 TOP COVER 1
4 949-822 HEX. SOCKET HD. BOLT M5X35 (10 PCS.) 4
5 883-451 EXHAUST COVER 1
6 883-452 GASKET (B) 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
11 878-863 O-RING (S-70) 1
12 882-910 CYLINDER PLATE 1
13 882-874 O-RING (S-46) 2
14 877-368 O-RING (1AP-48) 1
15 883-989 CYLINDER 1
16 883-431 O-RING (I.D 37) 1
17 883-980 PISTON (H) 1
18 883-988 BODY 1
19 NAME PLATE 1
20 883-432 PISTON BUMPER 1
21 874-436 O-RING (P-4) 2
22 883-981 NOSE 1
23 880-675 NYLOCK HIGH TENSION BOLT M6X20 4
24 883-093 PLUNGER (B) 1
25 949-497 ROLL PIN D4X16 (10 PCS.) 1
26 883-144 FEEDER ARM (B) 1
27 883-143 FEEDER SPRING 1
28 883-092 FEEDER 1
29 883-091 NAIL GUIDE SHAFT 1
30 882-900 PUSHING LEVER COVER (B) 1
31 883-852 PUSHING LEVER (A) 1
32 883-678 GASKET (B) 1
33 883-679 DUST FILTER 1
34 881-949 CAP 1
35 949-821 HEX. SOCKET HD. BOLT M5X16 (10 PCS.) 3
36 872-035 DUST CAP 1
37 880-881
MACHINE SCREW (W/WASHERS) M5X30 (BLACK)
1
38 949-865 ROLL PIN D3X28 (10 PCS.) 3
39 883-990 TRIGGER 1
40 882-885 PUSHING LEVER GUIDE 1
41 882-892 PUSHING LEVER SPRING 1
42 882-891 PUSHING LEVER (C) 1
43 880-093 ROLL PIN D2X16 1
44 883-982 ADJUSTER 1
45 882-890 ADJUSTER SPRING 1
46 882-887 ADJUSTER PLATE (B) 1
47 882-886 ADJUSTER PLATE (A) 1
48 981-317 O-RING (S-4) 2
49 882-888 PUSHING LEVER (B) 1
50 872-822 O-RING (S-5) 1
51 872-971
RETAINING RING (E-TYPE) FOR D3 SHAFT
1
*
ALTERNATIVE PARTS --- 3 ---
ITEM
NO.
CODE NO.
DESCRIPTION REMARKS
NO.
USED
PARTS
8 -- 02
NV 75AG
52 877-699 HEAD VALVE O-RING (I.D 16.8) 1
53 878-881 VALVE BUSHING (B) 1
54 878-885 O-RING (S-18) 1
55 878-925 O-RING (I.D 8.8) 2
56 878-887 O-RING (I.D 11) 1
57 880-672 VALVE PISTON (B) 1
58 878-884 PLUNGER SPRING 1
59 880-673 PLUNGER (A) 1
60 878-888 O-RING (I.D 1.8) 1
61 880-671 VALVE BUSHING (A) 1
62 872-645 O-RING (P-9) 2
63 880-330 O-RING (P-21) 1
64 883-300 FEED PISTON 1
65 882-883 FEED SPRING 1
66 877-711 BUMPER 1
67 880-331 FEED PISTON COVER 1
68 939-555
RETAINING RING FOR D28 HOLE (10 PCS.)
1
69 877-371 NYLON NUT M5 2
70 882-907 SLEEVE 1
71 883-853 PUSHING LEVER COVER (A) 1
72 882-901 PROTECTOR (B) 1
73 883-106 NOSE CAP (A) 1
74 878-184 WARNING LABEL 1
75 883-984 MAGAZINE (A) 1
76 883-111 PIN 2
77 877-826 FEEDER SHAFT RING 2
78 883-985 MAGAZINE COVER (A) 1
79 883-987 HOLDER CAP (A) 1
80 880-398 RATCHET SPRING 1
81 880-503 NAIL HOLDER 1
82 878-791 ROLL PIN D2.5X12 1
83 883-986 HOLDER SHAFT (A) 1
84 881-826 SPRING 1
85 880-319 SHAFT RING 2
86 949-757 HEX. SOCKET HD. BOLT M5X20 (10 PCS.) 1
87 880-318 GUIDE LOCK 1
88 880-446 SPRING 1
89 883-392 NAIL GUIDE 1
90 883-085 NAIL STOPPER (A) 1
91 883-088 STOPPER SPRING (A) 1
92 883-086 NAIL STOPPER (B) 1
93 883-087 STOPPER SPRING (B) 1
94 883-089 NAIL GUIDE COVER 1
95 883-393 COVER 1
96 882-881 SLEEVE (B) 2
97 880-630
NYLOCK HEX. SOCKET HD. BOLT M4X12
2
98 883-983 MAGAZINE ASS’Y 1 INCLUD.62,74-84
*
ALTERNATIVE PARTS
--- 4 ---
ITEM
NO.
CODE NO.
DESCRIPTION REMARKS
NO.
USED
8 -- 02
NV 75AG
STANDARD ACCESSORIES
Printed in Japan
(020830N)
501 875-769 EYE PROTECTOR 1
502 943-277 HEX. BAR WRENCH 3MM 1
503 944-458 HEX. BAR WRENCH 4MM 1
504 944-459 HEX. BAR WRENCH 5MM 1
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