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6-2
6.3 Hull Unit Maintenance
6.3.1 Lubrication
Grease the raise/lower screw shaft once a year. Also, grease the raise/lower main shaft (upper
part of the grease cotton retainer) twice a year. These parts can be accessed by removing the
raise/lower drive assembly cover.
6.3.2 Manually raising, lowering transducer
WARNING
Turn off the power at the ship's mains
switchboard before conducting the
procedure below.
Rotating motor can cause bodily injury.
1. Turn off the breaker on the hull unit.
2. Set 19 mm ratchet wrench to nut and turn.
3. Check that the transducer raises and lowers smoothly, from the upper to the lower limit
positions. If the transducer cannot be raised smoothly, do not use excessive force; the shaft
may bend, causing damage to other components.
4. Check soundome and tank. Remove marine life with fine sandpaper or piece of wood.
Attach ratchet
wrench here.
Figure 6-1 Hull unit