32
Temperature
The oil temperature should be between +30 °C and +60 °C during normal operation.
Oil life is greatly reduced if its temperature exceeds +60 °C. As a general rule, oil
life is halved for each 8 °C its temperature exceeds +60 °C.
If the oil temperature exceeds 80 °C the seals in the hydraulic system can get
damaged and the life time for the seals is reduced.
If the temperature is below minus 20 °C disengage the rope drum from the drive
chain and run the winch for 5 - 10 minutes.
Viscosity
The viscosity for the oil should be between 20 mm
2
/s and 75 mm
2
/s (100 and 370
SUS) when the operating temperature of the system has become stabilised. We
recommend the use of an oil type having a viscosity of 35 mm
2
/s (165 SUS) at the
actual operating temperature.
Filtering
It is necessary to keep the level of oil contamination at an acceptable level to
ensure problem-free operation. The recommended maximum level of contamination
in the hydraulic winch system is 20/16 (See ISO 4066). In our experience the 20/16
contamination level can be met by using a return 20 μm absolute or 10 μm nominal
lter.
4.1.3 Hydraulic Oil
Winch basics
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