Hitachi NT 65GB Technical Data And Service Manual page 25

Problem Possible cause
1) <Output section>
Nails cannot • The piston bumper is
be driven. abnormal (dislocated,
(Continued) deformed or damaged).
• Piston Ring (B) [17] of the
cylinder is abnormal
(dislocated, deformed or
damaged).
• The driver blade is
abnormal (deformed,
burrs, damaged or
fatigued).
2) • For short nails, the
Nails are adjuster is raised too high.
bent when
being driven. • Nails are not fully fed into
the injection port.
• Unspecified nails are
used.
• The driver blade is worn.
• The workpiece is very
hard.
• Nail Feeder (A) [92] is
abnormal (worn or
damaged).
3) • The adjuster is improperly
Head of a adjusted.
nail driven
into a • The workpiece is very
workpiece hard.
protrudes
from the
wood
surface. • The driver blade is worn.
4) • Unspecified nails are
Nails clog used.
the <Improper nail feed>
mechanism. • See <Magazine> in item 1).
• Driver blade worn.
• Nail Feeder (A) [92] is
abnormal (worn or
damaged).
Inspection method
• Pull the nail feeder
backward and perform idle
driving.
Check whether the driver
blade has returned.
• While operating the nailer
without nails, check
whether driving operation
is performed.
• After operating the nailer
without nails, check
whether the driver blade is
kept in the down position.
• Check whether the
adjuster is raised too high.
• See item 1).
• Check whether the driver
blade tip is abnormally
worn.
• Drive a nail into a soft wood
workpiece and check
whether the nail is bent.
• Check Nail Feeder (A) [92]
for any abnormal
condition.
• Turn the adjuster to the
lowest position and drive a
nail.
• Drive a nail into a soft
wood workpiece and
check whether the head
protrudes from the wood
surface.
• Operate the nailer without
nails and check whether
the driver blade projects
from the tip of the nose.
• Check whether the nails
are the specified ones.
• Check whether the nails
move smoothly after being
loaded, and then check
whether the nail feeder
operates smoothly.
• Check whether the tip of
the driver blade is worn.
• Check Nail Feeder (A) [92]
for any abnormal
condition.
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Corrective action
• Replace the piston
bumper.
• Reassemble or replace.
• Repair or replace.
• Turn the adjuster to a
lower position, in order to
reduce pressure.
• See item 1).
• Replace the driver blade.
• Do not use unspecified
workpieces.
• Replace Nail Feeder (A)
[92].
• Adjust the adjuster to the
proper position.
• Do not use unspecified
workpieces.
• Replace the driver blade.
• Use specified nails.
• See <Magazine> in item 1).
• Replace the part.
• Replace Nail Feeder (A)
[92].