Hitachi NT 65MA3, Руководство по обслуживанию

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O-ring in the plunger is
abnormal (removed,
deformed or damaged).
See item "1) Output section:
piston, driver blade, etc."
Reassemble or replace the
parts.
Problem Inspection method Remedy
4) Nails jam.
(continued)
Perform idle or actual driving
to check if the driver blade is
returned completely.
Disassemble the control
valve section, and check the
O-ring of plunger (A) and
valve piston (B).
Replace the part.
Replace the part.
Plunger (A) sliding surface
abnormal of valve piston (B)
(seized or deformed).
O-ring in plunger (A) is
worn.
Press the button of the blow
nozzle to check if it operates
smoothly.
Replace the abnormal part.
Replace the spring.
< Driver blade is not returned
completely >
See item "1) Output section:
piston, driver blade, etc."
Check each part for
abnormalities (worn,
damaged, deformed, etc.)
6) Air keeps
blowing from
the nose of
the blow
nozzle.
O-ring in valve piston (B) is
worn.
Replace the part.
Abnormal plunger (A),
trigger arm (A), pushing
lever (B), and/or body (worn
or damaged).
The position of a switching
device is mistaken.
The position of a switching
device is checked. A switching device is set to
the correct position.
5) Single
actuation
mechanism is
not possible.
Spring is abnormal (fatigued
or damaged).
9-2. Regrinding the Driver Blade
The tip of the driver blade should be ground as shown in Fig. 11. To grind with a grinder, gradually grind the tip
while cooling the ground area with water to prevent it from being excessively heated. Excessive grinding will
rapidly reduce the service life of the driver blade. In such a case, replace the driver blade.
Fig. 11
Driver blade
3 û 30"
Possible cause
( : most-common cause)