Due to the large temperature fluctuations and humidity in outdoor use, there is a high risk for the hydraulic system. If it heats up and cools down again, condensation will form in the tank and contaminate the hydraulic oil. In addition, biodegradable hydraulic oil, often of the Panolin brand, is used so as not to pollute the environment in case of leakage. However, these synthetic esters are highly hygroscopic and attract atmospheric moisture. The bio-oils decompose by water and age prematurely due to hydrolysis.
If ambient air is sucked into the tank, the moisture will remain in the tank. If the hydraulic tank cools down at the end of work (critical from below 9.2°C), the humidity in the tank will condense. This means that the risk of condensation water damage is is very high for a mobile machine.
To permanently protect an excavator from water, aeration dryers are a very effective and simple measure. While dirt particles from a size of 3μm are separated, the effect of complete air drying is added. Depending on the installation situation, two GIEBEL Adsorber® series are recommended.