Fluid and filter recommendations
To ensure optimum life, perform regular maintenance of the fluid and filter. Contaminated fluid is the
main cause of unit failure. Take care to maintain fluid cleanliness when servicing. Inspect vehicle for leaks
daily.
Check the reservoir daily for proper fluid level, the presence of water, and rancid fluid odor. Fluid
contaminated by water may appear cloudy or milky or free water may settle in the bottom of the
reservoir. Rancid odor indicates excessive heat. Change the fluid immediately if these conditions occur.
Correct the problem immediately.
Change the fluid and filter per the vehicle/machine manufacturer’s recommendations or at these
intervals:
First fluid change recommended at 500 hours.
High temperatures and pressures result in accelerated fluid aging. More frequent fluid changes may be
required.
Change the fluid more frequently if it becomes contaminated with foreign matter (dirt, water, grease,
etc.) or if the fluid is subjected to temperature levels greater that the recommended maximum. Dispose
of used hydraulic fluid properly. Never reuse hydraulic fluid.
Change filters whenever the fluid is changed or when the filter indicator shows that it is necessary to
change the filter. Replace all fluid lost during filter change.
Hazardous material
Warning
Hydraulic fluid contains hazardous material. Avoid contact with hydraulic fluid. Always dispose of used
hydraulic fluid according to state, and federal environmental regulations.
Fluid and filter change interval
Reservoir type Max. oil change interval
Sealed 2000 hours
Breather 500 hours
Service Manual
Series 51 and 51-1 Motors
Fluid and filter maintenance
26 |
©
Danfoss | March 2016 11008567 | AX00000013en-US0202
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