Maintenance manual
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7.7
Internal leakage test - with frequency controlled pumps
Note!
Performance of this test to be managed by the Chief Engineer when vessel is lying still in sheltered waters. The test is
to be done first with Pump no 1 and then again with pump no 2.
1.
Close the valve on leak oil pipe connected to the expansion tank.
2.
Loosen the leak oil pipe from the fitting on top of the actuator.
3.
Make a suitable pipe or hose to divert escaping return (overflow) oil into a drum or bucket, and
attach to the fitting on top of the actuator.
4.
Preparing for test with Pump no. 1 at Motor Controller Cabinet in steering gear room:
•
Pump no. 2: Turn selector switch to Stop
•
Pump no. 1: Turn selector switch to Local Control
•
Use Emergency Steering push buttons (3) to operate the steering gear with Pump no.1.
5.
Start test:
•
Move the rudder to a position about 33 deg angle to Stbd.
•
Start moving the rudder to Port by using the push buttons (3).
•
Start timing when the rudder passes 30 deg angle and stop timing when position reaches 30
deg Port. Release the push button
•
Measure the amount of oil collected, the time it takes to move, the pressure and oil
temperature.
6.
Start test:
•
Move the rudder to a position about 33 deg angle to Port.
•
Start moving the rudder to Stbd by using the push buttons (3).
Start timing when the rudder passes 30 deg angle and stop timing when position reaches 30
deg Stbd. Release the push button.
•
Measure the amount of oil collected, the time it takes to move, the pressure and oil
temperature.
7.
Preparing for test with Pump no. 2 at Motor Controller Cabinet in steering gear room –
•
Pump no. 1 : Turn selector switch to Stop
•
Pump no. 2: Turn selector switch to Local Control
•
Use Emergency Steering push buttons (3) to operate the steering gear with Pump no.2.
8.
Repeat steps 5 to 6.
9.
When testing is completed; Re-connect the leak oil pipe to the actuator
10.
Ensure that valve connected to the expansion tank is put back to OPEN position after completing
the test.
