Regrinding The Driver Blade - Hitachi NT65MA3 - 2-1/2 Angled Finish Nailer Service Manual

Problem
( : most-common cause)
< Driver blade is not returned
4) Nails jam.
completely >
(continued)
See item "1) Output section:
piston, driver blade, etc."
O-ring in plunger (A) is
5) Single
worn.
actuation
mechanism is
O-ring in valve piston (B) is
not possible.
worn.
Plunger (A) sliding surface
abnormal of valve piston (B)
(seized or deformed).
Abnormal plunger (A),
trigger arm (A), pushing
lever (B), and/or body (worn
or damaged).
The position of a switching
device is mistaken.
Spring is abnormal (fatigued
6) Air keeps
or damaged).
blowing from
O-ring in the plunger is
the nose of
abnormal (removed,
the blow
deformed or damaged).
nozzle.

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.
Possible cause
Driver blade
3û 30"
Inspection method
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).
Check each part for
abnormalities (worn,
damaged, deformed, etc.)
The position of a switching
device is checked.
Press the button of the blow
nozzle to check if it operates
smoothly.
Fig. 11
--- 16 ---
Remedy
See item "1) Output section:
piston, driver blade, etc."
Replace the part.
Replace the part.
Replace the part.
Replace the abnormal part.
A switching device is set to
the correct position.
Replace the spring.
Reassemble or replace the
parts.