Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual page 26

(2) Troubleshooting and correction in the case of general-purpose nailers
Problem
<Nails>
1) Nails cannot
Magazine is not loaded with
be driven.
specified genuine nails.
Magazine is loaded with
abnormal nails (bent nails,
large or small round-head
nails, abnormal collation,
etc.).
Nail or collating band clogs.
Collating band is deformed
or torn.
<Magazine>
Magazine is abnormal
(deformed or damaged).
Nail Feeder (A) [112] is
abnormal (deformed or
damaged).
Ribbon Spring [121] is
abnormal (deformed or
damaged).
Nail Rail [93] is abnormal
(deformed, burrs, damaged
or fatigued).
Adhesive fragments are on
the nail rail or they need oil.
Foreign matter is found on
the guide face of Nail Feeder
(A) [112].
<Nose>
Nail inlet groove of the nose
is abnormal (deformed, burrs
or damaged).
Adhesive fragments are in
the nail inlet groove.
Possible cause
Inspection method
Check if the magazine is
normally loaded with
specified nails.
Check if the nail feeder
operates smoothly in the
magazine.
Check if nails (one strip)
move smoothly in the
magazine.
Check if nails (one strip) are
fed smoothly into the nail
injection port of the nose.
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Remedy
Use specified nails.
Remove the abnormal nails
and load the magazine with
normal nails.
Repair or replace the
defective part.
Remove the adhesive
fragments and apply oil to
the nail feeder, Ribbon
Spring [121] and the nail
rail.
Repair or replace the
defective part.
Remove the adhesive
fragments.