Troubleshooting Guide; Troubleshooting And Correction - Hitachi NV 83A2 Technical Data And Service Manual

9. TROUBLESHOOTING GUIDE

9-1. Troubleshooting and Correction

Problem
(
1) Nails cannot
<Nails>
be driven.
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).
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.
Feeder piston chamber
contains foreign matter
such as broken pieces of
piston bumper, etc.
Possible cause
: Most-common cause)
Inspection method
Check that the magazine is
correctly loaded with
specified nails.
Remove the feed piston
and check the feed
piston sliding surface of
the nose.
Check that the driving
section is not abnormal
(burrs, deformed, damaged
or worn).
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.
--- 17 ---
Remedy
Use specified nails.
Remove the abnormal nails
and load the nailer with
proper nails.
Apply grease to the sliding
surface.
Polish the scratched portion
with sandpaper. Replace
the parts.
Deburr the nail guide face.
Correct the deformed parts.
Replace the abnormal parts.
Load nails in the correct
position in the nose.
Remove dust and then
lubricate the sliding surface.
Adjust the air pressure to
5 --- 8.5 kgf/cm 2 (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.