Furuno CH-270, Руководство по обслуживанию

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Assembling
1) Fill the soundome (D) with oil up to the white line on the inner surface.
2) Make sure that the o-ring is in position on the upper dome assembly.
3) Apply the sealant (Kinoruster) to the o-ring.
4) Fit the upper dome assembly into the soundome (D), marking sure that screw holes are
aligned.
5) While pressing down the upper dome assembly, hand tighten screws.
6) Fasten the screws securely in diagonal order, especially for the first four screws maked by 1
to 4 in Fig. 5.3.
Note: Screws are self-locking type which requires no washers.
As repeated use will weakens the locking force, new screws should be used after in a
few times of removal.
Figure 5.3