Hitachi NR90GC - 3-1/2" Gas Powered Clipped Head Framing Nailer Technical Data And Service Manual page 28

Problem
3) Head of a nail Adjuster is improperly
driven into a adjusted.
workpiece
protrudes
from the wood Workpiece is very hard.
surface.
Driver blade is worn.
4) Nails clog the Unspecified nails used.
mechanism.
<Improper nail feed>
See <Magazine> in item 1).
Driver blade worn.
Nail Feeder (A) [112] is
abnormal (worn or
damaged).
Possible cause
Inspection method
Turn the adjuster to the
lowest position and drive a
nail.
Drive a nail into soft wood
workpiece and check if the
head protrudes from the
wood surface.
Operate the nailer without
nails and check if the driver
blade is projected from the
nose tip.
Check if the nails are
specified ones.
Check if they move smoothly
after putting nails, and check
if the nail feeder operates
smoothly.
Check if the driver blade tip is
worn.
Check Nail Feeder (A) [112]
for abnormal condition.
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Remedy
Adjust the adjuster to the
proper position.
Do not use unspecified
workpieces.
Replace the driver blade.
Use specified nails.
See <Magazine> in iem 1).
Replace the part.
Replace Nail Feeder (A)
[112].