Furuno SEARCHLIGHT CH-250 - Manual (Page 21)

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4. Fully screw main shaft into the soundome neck, and then unscrew by four turns. Coat
threads with adhesive (HIGH SUPER).
Main Shaft
Grasp the soundome neck with a wrench,
and tighten the shaft with a pipe wrench.
Coat threads with adhesive
(HIGH SUPER).
Applying Adhesive (HIGH SUPER) to main shaft
5. Screw in main shaft completely.
6. As shown in the drawing below, confirm that the narrowest gap between the tank guide, and
retraction tank in the range (20 to 170 mm) is within 0.5 mm.
Tank guide
Retraction tank
less than 0.5mm
20 mm (400 stroke) -
170 mm (250 stroke)
Slide range
(Stroke) 250 or 400
Tank and tank guide, sectional view