Hitachi NR 90AC2 Technical Data And Service Manual page 25

Push
When
disassembling, do
not pull out this
part by gripping it
with the pliers.
Wire with 1.5 mm to 3 mm (0.059" to 0.118") dia.
Body [22]
Head Valve O-Ring
(I.D. 16.8) [50]
Valve Piston (B) [54]
Valve Bushing (A) [60]
Plunger (A) [58]
Fig. 14
Valve Bushing (B) [51]
Hole
Be careful not to damage
the internal surface.
Fig. 15
Pull out the Roll Pin D3 x 22 [45] with the roll
pin puller (3 mm dia.), and take out the
control valve in the following manner.
1) Remove the Exhaust Cover [5] by following
the procedure in (1), item 10-2.
2) As shown in Fig. 14, put in the 4 to 5 mm
(0.157" to 0.197") dia. bar from the upper side
of the Body [22] and push the top of Valve
Piston (B) [54]. Now, the parts forming the
control valve can be taken out except Valve
Bushing (A) [60] and the Head Valve O-Ring
(I.D. 16.8) [50].
[CAUTION]
Be careful not to damage Valve Piston (B)
[54], Valve Bushing (A) [60] and (B) [51],
etc.
Do not pull out the end of Plunger (A) [58]
with the pliers.
3) To take out Valve Bushing (B) [51], put a 1.5 to
3 mm (0.059" to 0.118") dia. wire with its end
hooked into the hole in the bushing and pull it
out while being careful not to damage the
internal surface of Valve Bushing (B) [51], as
shown in Fig. 15.
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