Fault tracing
20220422N 25
7 FAULT TRACING
If fault develops, the source and location must be traced. Close
all stop cocks to the pump unit and check whether the steering
gear functions normally using only the steering wheel pump. If
so, then the fault is most probably in the pump unit or junction
unit/autopilot computer.
The following faults may be tested for:
7.1 Pump (motor) is not running/not responding
to rudder command
Probable reason:
Brushes sticking or worn out. Remove the brushes and check.
Sticking brushes should be wiped clean and any carbon dust
should be removed from the brush holders. Check that the
brushes move without restraint before they are secured.
7.2 The piston rod does not move with rudder
commands
Probable reason:
1. Check that the stop cocks are open.
2. The pump is sucking air. Check outlets A, B and C for
leakage. If the fault is not found here, check the non-return
valves for leakage, especially the copper gaskets between the
end plug and the valve housing.
Leakage may also occur in the threads of the suction valves
grub screws (21). Check both. If leakage is present, the
pump unit has to be dismantled. See paragraph 7.10 for
dismantle and cleaning of the suction valves.
3. See also paragraph 7.10.
7.3 Excessive noise from the pump unit
Probable reason:
1. Air in outlet C to expansion tank. Ensure that the stop cocks
are open, if so, loosen the nut on the coupling and check that
the oil is flowing normally.
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