Furuno FSV-75, Installation Manual

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1. MOUNTING
1-7
7. Repeat step 4 to step 6 to raise the shaft (tank guide) until the gap between the
tank guide and pedestal is approx. 13 mm (for the steel retraction tank (inner di-
ameter: 316 mm)) or 8 mm (for the FRP retraction tank (inner diameter: 306 mm)).
When the shaft is raised, the roller springs are forced downwards by the pedestal,
pushing the rollers inwards.
Note: Roller springs reactively push against the shaft, which can add load to the
ratchet as the shaft is raised. Keep this in mind when raising the shaft and contin-
ue to raise until the gap between the pedestal and the tank guide is approximately
13 mm (for the steel retraction tank (inner diameter: 316 mm)) or 8 mm (for the
FRP retraction tank (inner diameter: 306 mm)).
8. Reattach the release lever to the holder.
9. Replace the ratchet wrench and motor cover.
1.2.5 How to install the hull unit on the retraction tank
Weld the retraction tank and allow sufficient time for cooling. Install the hull unit as fol-
lows:
Note: For installation using an existing CSH series hull unit retraction tank, see
section 1.10.
1. Clean the flange and O-ring groove of the retraction tank (welded to hull). Use
waste cloths moistened with ethyl alcohol.
2. Coat the O-ring and O-ring groove with lithium grease, then place the O-ring in its
groove on the tank flange.
3. Orient the hull unit so that the bow mark (inscribed on its flange) points toward the
ship's bow.
Note: If the bow mark on the hull unit flange is not facing the ship's bow, rotate the
transducer so that the bow mark on the transducer points toward the ship’s bow
(see section 1.2.9).
4. Confirm the following points, then place the hull unit on the retraction tank.
• Clean the flange platform.
• Wipe the undersurface of the hull unit flange with clean waste cloths.
• Keep O-ring in its groove.
Tank guide
Roller (×4)
· Steel retraction tank
(inner diameter: 316 mm):
13 mm
· FRP retraction tank:
(inner diameter: 306 mm):
8 mm