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9.13
How to Check the Brake in the Hull Unit
The main shaft in the hull unit has two brakes, motor brake and drive shaft brake. Have
a qualified technician check the brakes yearly.
Before doing the check, make sure no one is near the hull unit and transducer.
Note: Record the check result in the brake check sheet at appendix 2.
9.13.1
How to check the brake in the raise/lower control box
1. Unfasten six screws to remove the cover from the raise/lower control box in the
hull unit.
2. Set the toggle switch to the ([MBRAKE]) side.
3. Check that the Brake LED on the circuit board is lit. The LED does not light when
the motor break control circuit is abnormal. If the LED is OFF, return the toggle
switch to its original position and contact your dealer for advice.
4. Set the toggle switch to the [MBRAKE] position. Hold down the brake release
push switch to release the motor brake. Check that the main shaft does not lower
and the 7-segment LEDs on the circuit board does not change. If the main shaft
lowers or the LED lighting pattern changes, release the brake release push
switch. The drive shaft brake is abnormal; check the drive shaft brake.
5. Set the toggle switch to the ([ABRAKE]) side.
6. Check that the Brake LED on the circuit board is lit. The LED does not light when
the drive shaft gear brake control circuit is abnormal. If the LED is OFF, return the
toggle switch to its original position and contact your dealer for advice.
7. Hold down the brake release push switch to release the drive shaft gear. Check
that the main shaft does not lower and the 7-segment LEDs on the circuit board
does not change. If the main shaft lowers or the LED lighting pattern changes, re-
lease the brake release push switch. The motor brake is abnormal; check the mo-
tor brake.
7-segment LEDs
Brake release push switch:
Releases the toggle switch selected brake while
held down. The other brake is kept engaged.
Toggle switch:
Selects the brake to release, motor brake
([MBRAKE]) or motor drive brake ([ABRAKE]).
Brake LED:
Checks toggle switch selected brake for
proper operation. The LED lights red if the
brake is normal.
9. MAINTENANCE
9-19
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