Maintenance
66 Series 505G2 SilentFlo™ Hydraulic Power Unit
5. Check the fluid qualities of the sample by comparing it to a small jar of clean hydraulic fluid.
Clean hydraulic fluid has an amber color.
6. See the table, “Appearance of Hydraulic Fluid Sample,” for unacceptable fluid qualities.
7. If there still is any uncertainty regarding fluid quality, obtain another sample of the fluid and
have it analyzed. The fluid tests should include chemical analysis, particle count, and viscosity
checks. Most oil companies have facilities for performing these tests, or consult MTS Systems
Corporation.
8. Close the needle valve and remove the hose and valve assembly. Open the needle valve.
Appearance of Hydraulic Fluid Sample
Fluid
Properties
Problem What to Do
Dark colored
fluid
Indicates chemical breakdown
or the hydraulic fluid has been
allowed to rise above the
maximum recommended
temperature (severe
overheating)
Analyze the fluid and replace as required
by the analysis.
If the cause was overheating, flush the
entire system to remove varnish or residue.
Consult your MTS Field Service Engineer
to determine if changes or adjustments to
your hydraulic system are required.
Burnt odor Indicates chemical breakdown
or the hydraulic fluid has been
allowed to rise above the
maximum recommended
temperature (severe
overheating)
Analyze the fluid and replace as required
by the analysis.
If the cause was overheating, flush the
entire system to remove varnish or residue.
Consult your MTS Field Service Engineer
to determine if changes or adjustments to
your hydraulic system are required.
Opaque fluid Indicates chemical breakdown Replace the fluid
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