XR21S59 CHU 174
1/2018
113813003
Hooklift Multilift XR21S59 CHU
Service Manual
Oil qualities
Hydraulic system sets many requirements to the hydraulic oil characteristics.
They contain amongst others:
• Lubrication requirements
• Oxidation prevention capability
• Corrosion protection
• Defoaming quality
• High viscosity index, in other words, low change of viscosity when the oil is heated.
In order to meet these requirements and qualities, additives are used in oils. Therefore
it is important that the selected oil meets the characteristics for the operating
environment in question. A lower ambient temperature is the same as the lowest starting
temperature.
Note! Vegetable based bio oils are not allowed to be used. Only synthetic
environment friendly oils that meet the above mentioned
requirements are allowed.
Note! Do not mix dierent oil qualities. Mixing of dierent oils weakens
generally their characteristics. If it is necessary to use an alternative
oil, check with the supplier the characteristics and correspondence
with the recommended oil.
Changing to biodegradable oil
To obtain the best results, the percentage of the mineral oil left in the system should not
exceed 2%. The “Changing to biodegradable oil” –procedure might also apply to new
systems because the hooklift is tested with mineral oil at the factory if otherwise noticed.
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