Service Manual
Fuels, lubricants and process chemicals Hydraulic oil
For bio oils, a first analysis must be carried out after a change of oil type* and subsequently every 500 operating hours. *
Change of oil type = change from mineral oil to biodegradable hydraulic oil
Hydraulic fluid used in dust intensive applications:
Fig. 6
Oil sampling and filter change intervals for machines used for dust-intensive applications
h
Operating hours
1
First oil sample
a
Mineral oil
2
Second oil sample
b
Biodegradable hydraulic oil
3
Subsequent oil samples: every 250 operating hours
Interval for the change of the hydraulic oil return filter (10 µm): first change after 500 operating hours, then every 500 operating hours and after each hydraulic oil change. Interval for mineral oil change: every 500 operating hours, or when indicated by the lab report or analyses. The oil change intervals for bio oils are determined solely by oil analyses and lab reports. For bio oils, a first analysis must be carried out after a change of oil type* and subsequently at least every 500 operating hours. *
6.6
Change of oil type = change from mineral oil to biodegradable hydraulic oil
Recommendations for oil analyses For oil analyses, LIEBHERR recommends contracting WEAR-CHECK* and changing the oil when indicated by the test results in the lab report. For more information, see customer service and product information. *
6.7
Yellow kit for biodegradable hydraulic oils Green kit for mineral oils
Tips for the reduction of contamination of the hydraulic oil in machines used for dust-intensive applications If the machine is frequently operated with a hydraulic hammer or under similar conditions (high dust production), the hydraulic oil might become more heavily contaminated than under normal working conditions. To prevent premature wear of the hydraulic components, shorten the oil change intervals (or oil sampling intervals respectively) and observe the following instructions: The filter cartridge(s) in the return filter must be replaced every 500 operating hours and after every hydraulic oil change. Use 10-µm filter cartridges instead of the standard 20 / 5-µm cartridges.
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