Hitachi NR 83AA2 Technical Data And Service Manual page 20

Problem
(
Nails are not fully fed into
2) Nails bent
the injection port.
while being
driven.
Unspecified nails used.
Driver blade worn.
The material being driven
into is very hard.
3) The nail is
Air pressure too low.
driven into the
material but
the head is
raised above
The material being driven
the surface.
into is very hard.
Driver blade worn.
Piston O-ring abnormal
(worn, damaged).
Cylinder's internal surface
abnormal (worn, rough).
4) Nails clog the Unspecified nails used.
mechanism.
< Improper nail feed >
See <Magazine> in item 1).
Driver blade worn.
< The driver blade has not
returned completely. >
See <Output section:
Piston, driver blade, etc.>
in item 1).
Possible cause
: most-common cause)
Inspection method
See item 1).
See item 1).
Check if the driver blade tip
is abnormally worn.
Check if a nail is bent even
when driven into soft wood.
Drive the nail into soft wood
and check if the head is
raised or not.
Check if the driver blade tip
is worn.
Disassemble the output
section and check the
Piston O-ring and the
internal surface of the
cylinder for abnormal
condition.
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.
Perform idle driving or
actually drive with nails,
and check if the driver
blade has returned
completely.
--- 17 ---
Remedy
See item 1).
See item 1).
Replace the part.
Regrind. (See 9-2, "Regrinding
the Driver Blade".)
Unusable because the tool
is not designed for such
usage.
Adjust for 5 to 8.5 kgf/cm
(4.9 --- 8.3 bar, 70 --- 120 psi).
Unusable because the tool
is not designed for such
usage.
Replace the part.
Regrind. (See 9-2, "Regrinding
the Driver Blade".)
Replace the defective part.
Replace the defective part.
Use specified nails.
See <Magazine> in item 1).
Replace the part.
Regrind. (See 9-2, "Regrinding
the Driver Blade".)
See <Output section: Piston,
driver blade, etc.> in item 1).
2