Lubricating the hoisting spindle
The hoisting spindle is positioned between the gantry and the transducer shaft. The top of the transducer shaft is mounted to the hoisting spindle with a lifting clamp. When the hoisting spindle turns in either direction the lifting clamp moves up and down, and so does the transducer shaft with the transducer.
Prerequisites
The SY50 system is turned off. No special tools are required for this task. The following specific consumable is required for this task:
•  Lubricant
Use a machine oil that is insoluble in water, does not dry out, and can withstand the rotation without causing stains.
We recommend the following lubricant: Tonna Slideway Oil S68 
•  ManufacturerShell
•  Manufacturer’s websitewww.shell.com
•  Kongsberg Discovery part number654‑078793
Context
The hull unit was lubricated as a part of the installation process. During normal conditions, the lubricant applied will last for a long period of time. Additional lubrication of the hull unit must only take place when required.
Note
Do not use grease on the hoisting spindle. Use a machine oil that is insoluble in water, does not dry out, and can withstand the rotation without causing stains.
Procedure
1 Inspect the ball bearings on the top and the bottom of the hoisting spindle.
2 Inspect the hoisting spindle.
3 Consider whether it is necessary to lubricate the hoisting spindle.
4 Apply a thin layer of lubricant if required.
Note
Do not use excessive amounts of lubricant. If you use too much lubricant, there will be a lot of splashes and spills when the SY50 system is turned on.