Hitachi NR 83A2 Technical Data And Service Manual page 17

(2) Driving section
All the parts of the driving section (Nose [32], Pushing Lever Ass'y and Spring [46]) were newly designed.
They are not interchangeable with those of the Model NR 83A.
(3) Control valve section
Be careful not to make mistakes in mounting the following parts that were newly designed or changed for the
1
Model NR 83A2 because these parts are similar to those of the Model NR 83A but they are not
interchangeable.
Part
O-ring (I.D.10.7)
Inside diameter 10.7 mm
[58] (O-ring
mounted to the
outside of the
Valve Bushing
[57])
Plunger (A) [56]
NR 83A2
Inside diameter 11.5 mm
25 mm
NR 83A
26 mm
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Caution
Never mount the O-ring
(S12) for the Model NR 83A
to the valve bushing of the
Model NR 83A2 by mistake.
Otherwise, the O-ring may
be damaged when mounting
the valve bushing to the
body ass'y, 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 NR
83A2 to the valve bushing of
the Model NR 83A.
Otherwise, air leakage may
occur.
Do not mount plunger (A)
for the Model NR 83A to the
Model NR 83A2.
Otherwise, plunger (A) may
contact the body ass'y and it
may be damaged when
raising the pushing lever
ass'y to the uppermost
position.
There is no problem in
mounting plunger (A) for the
Model NR 83A2 to the
Model NR 83A.