90
TESTING HYDRAULIC FLUID
Test the uid regularly. A number of formal test kits are available to
evaluate the condition of hydraulic uid or a uid sample can be sent to a lab
for evaluation. However, there are simple signs of uid degradation such as a
color shift, bad aroma or feel of grit in a sample.
Don't neglect maintenance. Set up and adhere to a rigid preventative
maintenance schedule. One of the most important elements in such a
program is changing or adding to the uid on schedule.
WHEN TO CHANGE FLUID
Blotter spot test� This is a very simple test in which a drop of uid is placed
on a piece of blotter paper. If the blotter remains colorless or develops only a
light yellow ring, oxidation is under control. Even when color develops but is
uniform throughout, the oil is serviceable. If the sample shows distinct rings,
the uid should be changed. When a distinct dark spot remains in the middle
but lighter-colored oil migrates outward in the blotter paper, the oil has or is
about to dump sludge or other products into the system. This indicates that
the time for uid replacement has passed.
Listen for a sound change� If the operating system changes in sound level
usually louder or other than normal sounds, it is time to evaluate the uid's
condition.
Test for acid content� A shift in the acid content may indicate a break down
in the uid. Acid test kits are available from uid suppliers and the tests are
easy to carry out.
Excellent
HYDRAULIC OIL
HYDRAULIC OIL SIGHT GAUGE MUST BE 3/4 FULL�
CHANGE HYDR AULIC OIL FILTERS EVERY 400 HOURS�
CHANGE OIL AND CLEAN TANK EVERY 2,000 HOU RS
T his reservoir was initially filled with
MORBARK HYDREX XV hydraulic fluid
Whe n refilling t he system we recommend
MORBARK HYDREX XV hydra ulic fluid or equivalent.
OPER ATING R ANGE
-40° to 17 0° F (-40° to 77° C)
If Temperature Exceeds 170° F, Change Int
erval To Every 1,000 Hours.
For Every 15 ° F Tempe rature Incre ase, Redu ce Interval By 50%. Extended
Drain A cceptable, Only With Ongoing Oil Trend Ana lysis Prog ram And
Temperature s Averaging Less Than 140° F.
245 viscosity index
Anti-wear properties.
oxidation stability.
Rust, Corrosion, Foam resistance.
Good demulsibility.
High dielectric strength.
FLUID PROPERTIES:
NOTICE
39510-302
UNDERSTANDING HYDRAULICS
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