Mechanism And Operation Principle; Mechanism - Hitachi NR 90AC2 Technical Data And Service Manual

8. MECHANISM AND OPERATION PRINCIPLE

8-1. Mechanism

As illustrated in Fig. 4, the Model NR 90AC2 can be generally divided into four sections:
output section, control valve section, driving section and magazine section.
The magazine section has been newly designed though its basic construction is the same as that of the Model
NR 90AC. Features of the main parts are described below.
Output section ................. Most parts are common to the Model NR 90AC except the following parts.
Control valve section ....... The valve construction is similar to the Model NR 90AC.
Driving section ................ The nose and pushing lever (B) have been newly designed.
Magazine section ............ All the parts have been newly designed. The rear-loading type magazine is made
Top Cover [3]
Exhaust vent
Exhaust Valve
Rubber [7]
Head Valve [10]
Accumulator
Cylinder [17]
Piston [19]
Piston Bumper (A)
[24]
Piston Bumper (B)
[25]
Pushing Lever (B)
[33]
Adjuster (A) [ 34 ]
Pushing Lever (A)
[37]
Nose [30]
The dust filter is added to the cap. Owing to this addition, gasket (B) is changed.
The piston ring is changed to the O-ring.
The O-ring used in the head valve section is changed to swell-resistant type.
The rubber handle grip is adopted at the body ass'y.
of aluminum and equipped with an idling protector.
Plunger Spring [57]
Exhaust Cover [5]
,
Control valve
section
Rubber
Trigger (A) [46]
Nail feeder ass'y
Fig. 4 Construction
Plunger (A) [58]
O-Ring
Control valve section
Dust Filter [41]
Body [22]
Cap [42]
Magazine section
--- 8 ---
Valve Piston (B) [54]
Valve
Bushing (B) [51]
Valve Bushing (A) [60]