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8.7.4 Biodegradable hydraulic oils
* In place of normal hydraulic oil have been developed rapidly biodegradable oils in nature, in
which case the side effects in the event of the oil spill will also be reduced. Several forest compa-
nies require use of the above oils in their machines.
* Normal oils cannot be directly replaced with any biodegradable oil without making any changes
hydraulic equipment (e.g., pump seals, hoses).
* Biodegradable oils are divided into three main categories:
1. Synthetic hydraulic oils based on esters (HEE)
2. Synthetic hydraulic oils based on polyglycols (HEPG)
3. Hydraulic oils based on vegetable oils (HETG) e.g. rapeseed oils
8.7.5
Oil change of the hydraulic system
* The oil of the hydraulic system is changed in the spring
and in the fall or in every 1000 hours. Oil capacity of the
crane is the smallest, if the arms of all the hydraulic cylin-
ders are retracted. Then the oil tank is drained to be empty
and cleaned as necessary and the filter cartridges are re-
placed. The oil tank is filled to the upper mark with hydraulic
oil (see oils and lubricants). If the oil has been very dirty,
you may want to empty cylinders separately. It is done by
removing the hose on the rod side and by putting it in the
waste oil container. Then the cylinder rod is driven out and
the hose is attached back.
* The oil of the turning device is changed once a year and
the water removal is done 2 times a year. The oil level is
checked from the oil eye, the oil is changed by opening the
drain plug and the fill plug. The crane should be tilted in the
direction of the drain plug. When all the oil has drained, the
drain plug is attached and the turning device is filled with
the hypoid oil to the top of the oil eye (see oils and lubri-
WASTE OIL MUST ALWAYS BE DRAINED
cants).
INTO THE CONTAINER AND SUBMITTED FOR
FURTHER HANDLING
The use of HETG oils is prohibited in Kesla products!
Before you switch to using biodegradable oil, choose oil that is
the most suitable type of oil with the oil seller and determine the
suitability of the oil for pump seals and other hydraulic compo-
nents.
Draining
Filling hole
Oil gauge
Draining
59
MAINTENANCE
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