SWDM40 OPERATION & MAINTENANCE MANUAL
8.11 MAINTENANCE FOR EVERY 2000 HOURS
8.11.1 Changing Hydraulic Oil
Hydraulic oil is the work media of hydraulic system. Hydraulic oil with good quality can
improve the reliability of hydraulic system and extend the service life of hydraulic components.
Note！
■
Before changing hydraulic oil, release the pressure air in the tank through air
filter completely;
■
Before changing hydraulic oil, prepare a container with enough capacity to
place used hydraulic oil avoiding environment pollution;
■
It’s forbidden to mix hydraulic oil of different types and models.
■
When oil temperature of hydraulic system is above 60
℃，
VG68 hydraulic oil
should be adopted;
■ When oil temperature of hydraulic system is below 60℃, a lower type
hydraulic oil should be adopted; When the environment temperature is lower
than -25°, hydraulic oil should be preheated.
■ Before adding new hydraulic oil, check the cleanness of hydraulic tank, wash it
if necessary.
■
Hydraulic oil return filter element should be washed prior to adding new
hydraulic oil.
■
Effective filtering measurements should be taken to avoid oil pollution prior to
adding new hydraulic oil.
■ After adding new hydraulic oil, release air for hydraulic pumps before start-up,
details see chapter 8.1.2.5.
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