Hitachi NV 65AF3 Technical Data And Service Manual page 22

Problem
(
Driver blade is worn.
3) Nails cannot
be driven into
the workpiece
completely:
Piston ring is abnormal
the heads
(worn or damaged).
cannot be
made flush.
Cylinder inside surface is
(continued)
abnormal (worn or rough).
Exhaust valve rubber (A) is
abnormal (worn or damaged,
or seal face is scratched).
Head valve sliding surface is
abnormal (seized or
damaged, or lubrication is
needed).
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.
Possible cause
: Most-common cause)
Inspection method
Perform idle driving to check
the driver blade is projected
from the nose tip.
Disassemble the output
section and check the
piston ring and the inside of
the cylinder for abnormality.
Disassemble the exhaust
valve rubber (A) and check
for abnormality.
Check the sliding surface for
abnormality and lubrication.
Check if the specified nails
are used.
Check the nails as follows.
[Wire-collated nails]
Type
A
B
[Sheet-collated nails]
--- 19 ---
Remedy
Replace the part.
Replace the abnormal part.
Replace the part.
Replace the abnormal part.
Apply grease.
Use specified nails.
Remove the abnormal nails
and load the nailer with
proper nails.
[Wire-collated nails]
Unit: mm (inch)
d
D
2.1 --- 2.3
(0.083 --- 0.090 )
4.8 --- 6
(0.189 --- 0.236)
2.5 --- 2.8
(0.099 --- 0.110 )
[Sheet-collated nails]
D
5 --- 6
(0.197 --- 0.236) (0.094 --- 0.110)
L L
1 2
12 24
(0.945)
(0.472)
19 37.5
(1.476)
(0.748)
Unit: mm (inch)
d
2.4 --- 2.8