Troubleshooting Guide; Troubleshooting And Corrective Action - Hitachi NR 1890DC Service Manual

1. Troubleshooting and corrective action

Problem
(*: Most common cause)
1. <Nails>
Nails • Magazine is not loaded with
cannot be specified Hitachi genuine nails.
driven. • Magazine is loaded with
abnormal nails (e.g., bent nails,
abnormal collation)
• Worn-out piston tip
• Piston trouble
<Magazine section>
• Nail feeder trouble (deformation,
burring, break)
• Worn-out nail rail or magazine
plate
• Nail guide groove of blade guide
(B) too narrow or wide
• Nail guide groove trouble
(protrusion or burring) of blade
guide (B)
• Step in the nail shank guide
groove between blade guide (B)
and magazine
• Nail guide groove of the
magazine too narrow or wide
• Nail guide groove trouble
(deformation or burring) of the
magazine
* Unwanted objects (e.g., dust,
wood dust, adhesives) in the nail
guide groove of blade guide (B),
magazine and nail feeder
• Loose bolts of the output section
and the magazine section
• Nail feeding trouble
• No compressed air in the nailer
• Compressed air leak

TROUBLESHOOTING GUIDE

Possible cause
Inspection method
• Check whether the
magazine is correctly
loaded with specified nails.
• Check whether the piston
tip is excessively worn.
• Check the piston for any
trouble (e.g., deformation,
burring, break).
• Check the nail feed section
for any trouble (e.g.,
burring, deformation,
break, excessive wear).
• Load nails in the nailer and
make sure the nailer works
normally.
• Load nails in the nailer and
make sure the nailer works
normally.
—
• Check the nail feeder slide
surface for dust.
• Check the nail feeder slide
surface for deformation.
• Check the ribbon spring for
damage.
• Fill up the nailer with
compressed air, leave the
nailer still for one day, and
then check the nailing
work.
• Check the sealing surfaces,
X-rings, and O-rings inside
the cylinder, piston,
chamber cover, and
chamber base for flaws,
unwanted objects, and
other failures.
-1-
Corrective action
• Use specified nails.
• Remove abnormal
nails and load the
nailer with proper
nails.
• Replace defective
parts. See page 23.
• Replace defective
parts. See page 23.
• Remove burring.
• Correct the deformed
portion.
• Replace defective
parts.
• Remove unwanted
objects (e.g., dust,
wood dust,
adhesives).
• Tighten the bolts at the
specified torque.
• Replace defective
parts.
• Supply compressed
air.
• Disassemble the nailer
and clean the
chamber, piston, and
their vicinity.
• Replace the sealing
parts.