![background image](http://html.mh-extra.com/html/hitachi/nt-65gb/nt-65gb_technical-data-and-service-manual_143184012.webp)
-9-
8. MECHANISM AND PRINCIPLE OF OPERATION
8-1. Mechanism
The Model NT 65GB is a gas nailer that drives nails into workpieces with the aid of fuel
combustion energy. The basic construction of the Model NT 65GB is the same as that of the
Model NR 90GC2. Its principle of operation is completely different from that of a pneumatic nailer,
except for the magazine section. The Model NT 65GB is equipped with a fuel cell and a battery to
output combustion energy, in addition to such electric components as electric circuits, a motor,
and electric switches.
As illustrated in Fig. 3, the Model NT 65GB can generally be divided into three sections—the
output section, head section, and handle section. The following describes the features of the
main parts.
• Output section (Housing section):
This section outputs fuel combustion energy. The piston reciprocates to drive nails in the same
manner as a pneumatic nailer. The piston reciprocates in the cylinder. There is a driving unit
under the piston. The combustion chamber is encased in a chamber and burns fuel to output
combustion energy. The combustion energy output is then applied to the top of the piston,
thereby driving the piston downward to drive nails at the driving unit The nails are fed from the
magazine unit located in the handle section.
• Head section (Cylinder head section):
This section is at the top of the combustion chamber in the output section. There is a fan to stir
fuel and fuel is fed from the fuel cell to the combustion chamber in this section. The fan is
mounted to the motor. The motor is held in the motor mount and secured to the center of the
cylinder head through the spring.
This spring absorbs shock to the motor. There is a spark plug beside the fan. The top cover at
the top of the main body covers the filter. The cell lever feeds fuel from the fuel cell to the
combustion chamber. Its rotation is supported.
• Handle section:
This section consists of a magazine unit to feed nails to the driving unit, battery holder, handle
unit, fuel cell holder, and related electrical wiring. The magazine unit features a construction
similar to that of a pneumatic nailer. There is a controller behind the magazine unit to control
electric signals. The handle unit contains a trigger and a spark switch. The electrical wiring
connects the battery, trigger switch, and fan switch. Each time the controller receives a switch
signal, the motor in the head section rotates and the spark plug discharges.