Hitachi NV 50AG2, Technical Data And Service Manual

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* The air passage is jammed
(with pieces of broken
piston bumper etc.).
* The feed piston chamber
contains foreign matter
such as pieces of broken
bumper etc.
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.
8. TROUBLESHOOTING
8-1. Troubleshooting and Correction
Fault
Cause
(The mark * refers to main causes.)
Inspection method Remedy
(1)
Nails fail to
eject.
< Nail >
The nailer is loaded with
nails not approved by
Hitachi.
The nailer is loaded with
abnormal nails (bent nails,
nail heads too large, or too
small, abnormally collated
nails, deformed sheet).
Nails or link pieces are
jammed.
Deformation and breaking
of collated nails Check whether or not the
nailer is normally loaded with
nails approved by Hitachi. Use specified nails.
Remove abnormal nails and
load the nailer with proper
nails.
< Nail feeding section:
nose, feeder,
feed piston, etc. >
The sliding resistance of
the feed piston is too great.
The nail guide face of the
nose is abnormal
(deformed, jagged,
damaged and/or worn).
The feed spring and/or
feeder spring is abnormal
(damaged and/or fatigued).
The feeder is abnormal
(damaged and/or worn). Remove the feed piston, and
examine the feed piston slide
surface of the nose. Apply grease.
Polish the scratched section
with abrasive paper.
Replace parts.
Check whether or not the nail
feeding section is abnormal
(jagged, deformed, damaged
or worn). Replace parts.
Smooth jagged areas.
Correct the deformed part.
The nose is not correctly
loaded with nails in the
groove. Check whether or not the
nailer is correctly loaded with
nails in the specified groove. Load the nailer with nails in
the correct position in the
nose.
Insufficient oil and/or dust
sticking in the chuck
groove's slide of the nose. Remove dust and then apply
oil.
Air pressure is too low. Adjust air pressure in a range
of 4.9 --- 8.3 bar (5 --- 8.5
kgf/cm
2 , 70 --- 120 psi).
Open the nail guide and inject
air to check the feeder's
action.