Use and Care Manual

57
Hydraulic System Cleanliness
Keeping the hydraulic oil clean is a vital factor affecting the service life of hydraulic
components. Oil in hydraulic systems is used not only to transfer power, but also to
lubricate the hydraulic components used in the system. Keeping the hydraulic system
clean will help avoid costly downtime and repairs.
Major sources of hydraulic system contamination include:
 Particles of dirt introduced when the hydraulic system is opened for maintenance or
repair
 Contaminants generated by the mechanical components of the system during
operation
 Improper storage and handling of hydraulic oil
 Use of the wrong type of hydraulic oil
 Leakage in lines and fittings
To minimize hydraulic oil contamination:
 Clean hydraulic connections before opening the lines. When adding oil, clean the
hydraulic tank filler cap and surrounding area before removing it.
 Avoid opening the pumps, motors, or hose connections unless absolutely necessary.
 Plug or cap all open hydraulic connections while servicing the system.
 Clean and cover the containers, funnels, and spouts used to store and transfer the
hydraulic oil.
 Change the hydraulic filters and oils at the recommended service intervals.
Hydraulic Oil Requirements
We recommend the use of a good petroleum-based, anti-wear hydraulic oil in the hydraulic
system of this equipment. Good anti-wear hydraulic oils contain special additives to reduce
oxidation, prevent foaming, and provide for good water separation.
When selecting hydraulic oil for your machine, be sure to specify anti-wear properties.
Most hydraulic oil suppliers will provide assistance in finding the correct hydraulic oil for
your machine.
Avoid mixing different brands and grades of hydraulic oils.
Most hydraulic oils are available in different viscosities.
The SAE number for oil is used strictly to identify viscosity—it does not indicate the type
of oil (engine, hydraulic, gear, etc.).
When selecting a hydraulic oil be sure it matches the specified SAE viscosity rating and is
intended to be used as a hydraulic oil. See section Technical Data—Lubrication.