Hitachi NR 90AC3, Технические данные и руководство по обслуживанию

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Fig. 16
Fig. 17
Pull out the Roll Pin D3 x 22 [46] 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. 16, 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) [57]. Now, the parts forming the
control valve can be taken out except Valve
Bushing (A) [63] and the Head Valve O-Ring
(I.D. 16.8) [53].
[CAUTION]
Be careful not to damage Valve Piston (B)
[57], Valve Bushings (A) [63] and (B) [54],
etc.
Do not pull out the end of Plunger (A) [61]
with the pliers.
3) To take out Valve Bushing (B) [54], 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) [54], as
shown in Fig. 17.
Valve Bushing (B) [54]
Hole
Wire with 1.5 mm to 3 mm (0.059" to 0.118") dia.
When
disassembling, do
not pull out this
part by gripping it
with the pliers.
Plunger (A) [61]
4 to 5 mm (0.157" to 0.197") dia. bar
Valve Piston (B) [57]
Valve Bushing (A) [63]
Head Valve O-Ring
(I.D. 16.8) [53]
Body [22]
Be careful not to damage
the internal surface.
Push