Hitachi NR 83A2 Technical Data And Service Manual page 26

Problem
For short nails, the adjuster
2) Nails are bent
is raised too high.
when being
driven.
Nails are not fully fed into
the injection port.
Unspecified nails are used.
Driver blade is worn.
Workpiece is very hard.
3) Head of a nail Adjuster is improperly
driven into a adjusted.
workpiece
protrudes Air pressure is too low.
from the wood Workpiece is very hard.
surface.
Driver blade is worn.
Piston ring is abnormal
(worn or damaged).
Cylinder's internal surface is
abnormal (worn or rough).
4) Nails clog the Unspecified nails used.
mechanism.
<Improper nail feed>
See <Magazine> in item 1).
Driver blade worn.
<The driver blade has not
returned completely.>
See <Output section> in
item 1).
Possible cause
Inspection method
Check if the adjuster is
raised too high.
See item 1).
Check if the driver blade tip
is abnormally worn.
Drive a nail into soft wood
workpiece and check if the
nail is bent.
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
wood surface.
Operate the nailer without
nails and check if the driver
blade is projected from the
nose tip.
Disassemble the output
section and check the piston
ring, O-ring and the inner/
outer surfaces of the
cylinder for abnormal
condition.
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.
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Remedy
Turn the adjuster to the
lower position to decrease
the pressure.
See item 1).
Replace the driver blade.
Do not use unspecified
workpieces.
Adjust the adjuster to the
proper position.
Adjust for 5 to 8.5 kgf/cm
Do not use unspecified
workpieces.
Replace the driver blade.
Replace the defective part.
Use specified nails.
See <Magazine> in item 1).
Replace the part.
See <Output section> in
item 1.)
2
.