Prerequisites
Neither tools nor instruments are required. You will however need a commercially available mild detergent and a lint free cloth.
Two persons are needed to do the task.
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One person must stay on the bridge in order to operate the SY50 system. |
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One person must stay in the sonar room to make sure that the SY50 system starts, and that the hull unit works properly. |
Proper oral communication must exist between the bridge and the sonar room.
The steps marked [Bridge] are done on the bridge.
Procedure
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1 |
Make sure that the hull unit is kept clean and dry. |
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2 |
Make sure that the unit is not exposed to excessive dust and vibrations. |
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Make sure that there are no corrosive attacks on the hull unit, mounting flange, installation trunk, support brackets or other
parts of the installation. |
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Remove dust and salt water residue with a soft cloth moistened in fresh water. Use a mild detergent.
NoteDo not use strong solvents.
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5 |
Make sure that all the bolts are properly tightened.
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a |
If necessary, tighten the bolts firmly. |
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b |
Pay extra attention to the bolt on the lifting clamp. |
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Make sure that the vibrations in the vessel have not caused the transducer shaft to move. |
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If necessary, adjust the height.
See the following step: 13. Restoring the transducer shaft to its original position
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[Bridge]: Make sure that you have sufficient water depth below the keel before you lower the transducer. |
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[Bridge]: Turn on the SY50 system. |
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[Bridge]: Lower the transducer to its bottom position.
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Make sure that the transducer can be lowered and hoisted without complications or obstacles. |
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Make sure that the transducer cable can move freely when the transducer is lowered and hoisted. |
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[Bridge]: Hoist the transducer to its upper position.
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12 |
[Bridge]: Turn off the SY50 system. |
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13 |
Restoring the transducer shaft to its original position:
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a |
Hold the transducer shaft firmly in place to prevent it from falling down.
Do not damage the surface of the transducer shaft. If you use a mechanical device to hold the transducer shaft, make sure that the surface of the shaft is not damaged. Any dents or scratches in this surface may result in a water leak through the gaskets in the mounting flange.
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b |
Loosen the bolt on the lifting clamp. |
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c |
Adjust the vertical position of the transducer shaft. |
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d |
Make sure that the transducer shaft surface is clean from grease or other particles, then tighten the bolt on the lifting
clamp.
NoteThis is a critical step. The lifting clamp supports the total weight of the transducer shaft, trunk bearing and transducer. Inaccurate mounting of the lifting clamp can cause the transducer shaft to loosen. This can cause damage to the sonar system, and even to the vessel if the transducer shaft and transducer are lost. Make sure to use the wedge lock washers.
Use the following torque: 75 Nm
Note
Make sure to use the wedge lock washers. A wedge lock washer (also known as a Nord-lock washer) is a two-piece washer with radial teeth on one side and wedging action
of the halves where they join. These washers provide the highest amount of vibrational loosening prevention.
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