Hitachi NR 90AD Manuel D'instructions Et De Sécurité page 19

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 17.
Ribbon spring weakened or
damaged?
Check for proper nails.
Check air pressure.
——————
Driver blade worn?
Piston O – ring worn or damaged?
Check air pressure.
Check for proper nails.
Check function of nail feeder per
page 17.
Ribbon spring weakened or
damaged?
——————
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, 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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