Hitachi NT 65A3, Technical Data And Service Manual

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(3) Control valve section
Be careful not to make mistakes in mounting the following parts that were changed for the Model NT 65A3
because these parts are similar to those of the Model NT 65A2 but not interchangeable.
O-ring (I.D 10.7)
[44] (O-ring
mounted to the
outside of the
Valve Bushing
[45])
Part
NT 65A3 NT 65A2 Caution
Inside diameter 10.7 mm
Never mount the O-ring (S12)
for the Model NT 65A2 to the
valve bushing of the Model
NT 65A3 by mistake.
Otherwise, the O-ring may be
damaged when mounting the
valve bushing to the body,
and the damaged O-ring may
cause a malfunction when
selecting the single actuation
(single sequential actuation)
mechanism.
Do not mount the O-ring (ID
10.7) for the Model NT 65A3
to the valve bushing of the
Model NT 65A2. Otherwise,
air leakage may occur.
Valve Bushing [45]
Part
NT 65A3 NT 65A2 Caution
These parts were newly
designed to provide the single
actuation (single sequential
actuation)/contact actuation
selector. They are not
interchangeable.
Plunger (B) [52]
Parts that were changed for the Model NT 65A3 and not interchangeable with those of the Model NT 65A2
(except the parts described in )
2
Cross-sectional view
Valve Sleeve [47]
(Switching device)
O-ring (P-9) [46]
Plunger O-ring
[49] (Mounted to
the inside of the
Valve Bushing
[45])
O-ring (P-9)
Wire dia. 1.9 mm
Inside dia. 8.8 mm
These parts are exclusive to
the Model NT 65A3.
Wire dia. 1.5 mm
Inside dia. 4.5 mm
1
Inside diameter 11.5 mm
1