Hitachi NT 65MA3, Руководство по обслуживанию

Страница: 18 / 37

--- 15 ---
< Improper nail feed >
See item "1) Magazine
section."
Cylinder inside surface is
abnormal (worn and rough).
Adjuster is incorrectly set.
Nails are not completely fed
into the injection port.
Adjust the air pressure to 4.9
to 8.3 bar (5 to 8.5 kgf/cm
2 ,
70 to 120 psi)
Turn the adjuster to the
deepest driving position and
then drive nails.
Replace the part.
Apply grease. Head valve (A) sliding
surface is abnormal (seized
or damaged, or lubrication is
needed.)
See item 1).
Problem Inspection method Remedy
1) Nails cannot
be driven.
(continued)
Perform idle driving to
check the driving operation.
Perform idle driving to check
that the driver blade is not
held in the down position.
Replace the abnormal part.
Set the adjuster to the
optimum position.
Replace the part. Head valve spring is
abnormal (fatigued or
damaged).
O-ring or sliding surface is
worn or needs lubrication.
Adjuster is raised too high
for short nails.
Check that the adjuster is
not raised too high.
Replace the abnormal part.
Apply grease.
Turn the adjuster lower
(lower the pressure).
Workpiece is too hard.
Head valve (A) sliding
surface is abnormal (seized
or damaged, or lubrication
is needed).
Nailer cannot be used
because the material is
beyond its applicable range.
Replace the part.
Regrind (see 9-2,
"Regrinding the Driver
Blade").
Replace the O-ring.
Replace the part.
Apply grease.
Disassemble the output
section and check the
O-ring and the inside of the
cylinder for abnormality.
< Control valve section >
Plunger (A), valve piston
(B), valve bushing (A) or
valve bushing (B) is
abnormal (seized or
damaged).
Disassemble the control
valve section and check the
O-rings.
2) Nails are
driven but
bent.
Unspecified nails are used.
Driver blade is worn.
See item 1).
Check that the driver blade
tip is not abnormally worn. Replace the part.
Regrind (see 9-2,
"Regrinding the Driver
Blade").
Workpiece is too hard.
Check if a nail is bent even
when driven into soft wood.
Nailer cannot be used
because the material is
beyond its applicable range.
3) Nails cannot
be driven into
the workpiece
completely:
the heads
cannot be
made flush.
Check if a nail is bent even
when driven into soft wood.
Driver blade is worn. Perform idle driving to check
the driver blade is projected
from the nose tip.
O-ring in the piston is
abnormal (worn or damaged).
Replace the part.
Air pressure is too low.
Check the sliding surface for
abnormality and lubrication.
Unspecified nails are used.
See item "1) Magazine
section."
Check if the specified nails
are used. Use specified nails.
Driver blade is worn.
Replace the part.
Regrind (see 9-2, "Regrinding
the Driver Blade").
4) Nails jam.
Check that the driver blade
tip is not abnormally worn.
Check if they move
smoothly after loading nails,
and check if the nail feeder
operates smoothly.
Possible cause
( : most-common cause)