7.2 LUBRICATION SYSTEM
7.2.1 GENERAL INFORMATION
The gear unit internal parts are usually lubricated with a mixed oil bath and oil splash system. In some
configurations certain bearings may be grease lubricated and equipped with Nilos seal rings. A forced
lubrication system can be supplied on request.
7.2.2 OIL SPLASH LUBRICATION
In gear units with oil splash lubrication the rotation of the gears serves to churn the lubricant and
distribute it to the gear teeth and bearings also in positions above the oil level.
To guarantee effective lubrication the oil must be sufficiently fluid, i.e. the viscosity must be such as to
allow it to flow freely, while simultaneously maintaining suitable characteristics to support high gear
meshing loads. Specifically, attention must be paid to the following conditions:
starting of gear units at ambient temperatures below 0°C or above 90°C
starting in situations in which the minimum ambient temperature is not at least 10°
higher than the oil drop point
7.2.3 FORCED LUBRICATION
The gear unit is equipped with a volumetric pump when forced lubrication of gears and/or bearings is
required. The oil pump can be keyed to the gear unit input shaft or mounted on board the machine and
coupled to an electric motor supplied separately, thereby ensuring that the pump provides a constant
flow rate.
In the presence of forced lubrication, especially at the time of plant start-
maximum permissible viscosity (1800 cSt). Depending on the lubricant utilised said value is found at
ambient temperatures of between approximately 10°C and 20°
C. If this value is not complied with, the
oil must be preheated.
If possible, it is important to start the lubrication system before starting the gear unit, taking care to run
the unit at moderate speeds and working loads as long as the oil temperature is below 20°C.
The plant can be equipped with suitable devices to ensure correct operation and monitor the main
functional parameters. For the relative information refer to the respective headings.
7.2.4 FORCED LUBRICATION WITH PUMP
The system is composed of a pump keyed directly to the gear unit input shaft, a coarse mesh filter, an
oil flow visual indicator and the relative connecting pipelines.
Keep a regular check on the oil flow visual indicator. If you note that oil is not circulating in the
system stop the gear unit and locate the cause of the problem.
To ensure the optimum supply of lubricant, a constant rotation speed must be maintained at a
value that is as close as possible to the rotation speed for which the pump was selected (see sales
catalogue).
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