Hitachi NR 90AD Manuel D'instructions Et De Sécurité page 21

Operator troubleshooting
Most minor problems can be resolved quickly and easily using the table below.
If problems persist, contact a Hitachi authorized service center for assistance.
PROBLEM
Nailer operates,
but no nail is driven.
Weak drive.
Slow to cycle.
Drives too deep.
Skipping nails.
Intermittent feed.
Nails jam.
Driven nail is bent.
Drives properly during
normal operation,
but does not drive fully
at faster nailing speeds.
CHECK METHOD
Check for a jam.
Check function of nail feeder
per page 19.
Ribbon spring weakened or
damaged?
Check for proper nails.
Check air pressure.
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Driver blade worn?
Piston O – ring worn or
damaged?
Check air pressure.
Check for proper nails.
Check function of nail feeder
per page 19.
Ribbon spring weakened or
damaged?
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Piston O – ring cut or heavily
worn?
Nail feeder (A) worn or
damaged?
Check for proper nails.
Driver blade worn?
Nail feeder (A) worn or
damaged?
Check inside diameter of air
hose.
CORRECTION
Clear a jam.
Clean and lubricate.
Replace ribbon spring.
Use only recommended nails.
Increase air pressure. (Do not
exceed 120 psi (8.3 bars,
2
8.5 kgf/cm ))
Use Hitachi pneumatic tool
lubricant.
Contact Hitachi for
replacement.
Reduce air pressure.
(Adjust 70 – 120 psi)
Use only recommended nails.
Clean and lubricate.
Replace ribbon spring.
Use Hitachi pneumatic tool
lubricant.
Contact Hitachi for
replacement.
Replace nail feeder (A).
Use only recommended nails.
Contact Hitachi for
replacement.
Replace nail feeder (A).
Use larger air hose.
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