Fault tracing
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:
7.1Pump (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.
7.2The 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
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.
7.3Excessive 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.
20220422N | 25 |
