Hitachi NR 90AE (S), Технические данные и руководство по обслуживанию, Страница: 24 / 42

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Fig. 12
(a) Reassembly
Disassembly procedures should be followed in the reverse order. Note the following points.
Charge the sliding portion of the Head Valve [9] of the Exhaust Cover [5] with about 3 grams of grease and
apply grease to each surface of the O-rings.
As shown in Fig. 12, firmly push the Exhaust Valve Rubber [11] until it is fully seated over the projection of the
Exhaust Cover [5] .
Exhaust Cover [5]
Apply grease of 3 grams
to the sliding portion.
Head Valve [9]
Exhaust Valve Rubber [11]
Push until the rubber is fully
seated over the projection.
Mount the Sheet [3] in the direction as shown in Fig. 13 aligning the center of the hole of the Sheet [3] with the
center of the bolt hole of the Exhaust Cover [5] . If not aligned, abnormal exhaust noise may be heard.
Fig. 13
Sheet [3]
Exhaust Cover [5]
Align the center of the hole of
the Sheet
[3] with the center
of the bolt hole of the Exhaust
Cover
[5] .