Furuno CH-37 Checking manual raise/lower of transducer with hand crank

Grease cotton retainer

7 to 9 mm

Grease cotton

Figure 1-13 Tightening the grease cotton retainer

Checking manual raise/lower of transducer with hand crank

Perform this check after all wiring has been completed. Ship’s mains power must applied to the hull unit, otherwise the magnetic brake of the raise/lower motor activates, disabling the manual raise/lower gears.

1.Turn off the breaker on the hull unit.

2.Detach the brake-off switch cover.

3.Set hand crank to the screw shaft gear and turn it while pressing the brake-off switch.

4.The transducer should rise/lower smoothly with even force in upper to lower limits. If not, the centers of the main body flange and the retraction tank are not aligned. Adjust the hull mounting position if necessary.

Brake Off	Raise
switch
	Lower

Breaker

Raising/lower manually without connecting ship's mains may damage motor.

Figure 1-14 How to use the hand crank

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