Furuno CH-500, Installation Manual

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1. MOUNTING
1-33
1.6.6 Checking manual raise/lower of transducer
Raise/lower the transducer manually to check the raise/lower function after installing
the hull unit.
1. Turn the hull unit (raise/lower control unit) off.
2. Unfasten four SEMS screws (M4
u
20) to remove the gear cover.
3. Set the ratchet wrench (hex. size: 19 mm) to the motor gear and rotate the wrench.
4. Confirm that the transducer raise/lower smoothly with even force in upper to lower
limits. If not, adjust the hull mounting position if necessary, checking the following
points:
• The centers of the shaft sleeve and retraction tank are not aligned.
• Painting inside the retraction tank is not smooth.
• Inner diameter of the tank is not uniform.
• Welding bead
Note: If the transducer cannot be raised or lowered smoothly, do not use exces-
sive force.
Turn the power
switch off.
Power switch
CAUTION
Turn off the power switch on the hull
unit before manually raising or
lowering the transducer.
If the raise/lower unit starts unexpectedly,
the rotating ratchet may cause injury.
SEMS screw
(M4×10, 4 pcs)
Ratchet wrench
Gear cover
Motor gear
Raise
Lower