Furuno CH-300 Installation Manual page 34

1. MOUNTING
Checking manual raise/lower of soundome with hand crank
Perform this check after all wiring has been completed.
1. Turn off the breaker on the hull unit.
2. Detach the gear cover.
3. Set wrench (opposite side19 mm) to the screw shaft gear.
4. The transducer should rise/lower smoothly with even force in upper to lower
limits. If not, the centers of the shaft sleeve and the retraction tank are not
aligned. Adjust the hull mounting position if necessary. Check the following
points.
• Painting inside tank not smooth.
• Inner diameter of tank not uniform.
• Welding bead is obstructing raising and lowering.
1-26
CAUTION
Turn the main power off before this check,
otherwise the raise/lower motor action may
cause injury.