Hitachi NR 90AE (S), Технические данные и руководство по обслуживанию, Страница: 27 / 42

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Fig. 16
Fig. 17
Pull out the Roll Pins D3 x 25 [20] and
D3 x 32 [21] 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 Ass'y [24] and push the top of the
Valve Piston [65] . Now, the parts forming the
control valve can be taken out except Valve
Bushing (B) [62] .
[CAUTION]
Be careful not to damage the Valve Piston
[65], Valve Bushings (A) [70] and (B) [62],
etc.
Do not pull out the end of the Plunger [69]
with the pliers.
3) To take out Valve Bushing (B) [62] , 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) [62] , as
shown in Fig. 17.
Valve Bushing (B) [62]
Holes
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 [69]
4 to 5 mm (0.157" to 0.197") dia. bar
Valve Piston [65]
Valve Bushing (A) [70]
Body Ass'y [24]
Be careful not to damage
the internal surface.
Push