Mechanism And Operation Principle; Mechanism - Hitachi NV 75AG Technical Data And Service Manual

8. MECHANISM AND OPERATION PRINCIPLE

8-1. Mechanism

As illustrated in Fig. 7, the Model NV 75AG can be generally divided into four sections:
Output section, control valve section, driving section and magazine section.
The parts of the output section and the control valve section are the same as those of the Model NR 65AK to
allow the use of nails 75 mm (3") long, though the basic construction is the same as the Model NV 65AH.
The parts of the driving section and the magazine section have been newly designed.
Primary differences from the Model NV 65AH are described below.
Output section ................... To make it powerful, the output section is common to the Model NR 65AK except
Control valve section .......... The control valve section is common to the Model NR 65AK except the following:
Driving section and magazine section ............. The parts of the driving section and the magazine section have
the following:
Body: There is no interchangeability with the Model NR 65AK since the Model
NV 75AG has an air passage to feed nails. The handle is equipped with
the grip rubber (rubber-ring type) instead of the grip tape. (Note that the
repair part is the conventional grip tape because the grip rubber cannot
be replaced by hand.)
Cylinder: Newly designed.
Piston: Newly designed.
Dust filter: Dust filter is provided between the air inlet cap and the body to
prevent dust from entering the inside (common to the Model
NR 90AC2).
Gasket (B): The shape is changed to install the dust filter (common to the Model
NR 90AC2).
Plunger spring: Common to the Model NV 65AH.
Trigger: Newly designed.
Driving depth adjuster: Located near the trigger to simplify the nose unit.
been newly designed.
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The tip of the nose is easy to see and operate.