Furuno CH-270 Installation Manual page 30

Note 1: Manual raising and lowering of transducer
Remove the top cover of the raise/lower drive
assy. and set the hand crank as shown left.
Turn off the power switch and disconnect the
connector from the motor lead wires on the
hull unit before using the hand crank. The
soundome can be easily raised and lowered
manually because the motor which works as a
generator is isolated from the load.
Note 2: The bottom of the soundome is
placed 10 mm above the bottom of
the retraction tank when the top of the
shaft retainer is fastened 17 mm
below the top of the main shaft.
Note 3: The shaft retainer should be securely
fastened. It is recommended to use a
wrench with a length of approx. 300
mm. The torque should be 20-25 Nm.
Hand Crank
Ends should touch one another.
18
Disconnect
connector.
17 mm
10 mm