Maintenance
Series 505G2 SilentFlo™ Hydraulic Power Unit 67
Fluid
Properties
Problem What to Do
Milky
appearance
Indicates water is present in
the fluid
Check the heat exchanger for damage.
Look for other water sources if the water
does not appear to be coming from the
heat exchanger.
Identify and correct the source of the water
leakage and replace the fluid if necessary.
Sediment at the
bottom of the
sample
container (after
sample has
stood overnight)
Indicates collapsed, ruptured,
or clogged filter(s)
Analyze the fluid and replace all filter
elements.
Clean the fluid or replace it as required by
the analysis.
Replacing the Hydraulic Fluid
Replace the hydraulic fluid in the HPU reservoir whenever you have determined that the hydraulic fluid
is no longer suitable for use.
Recommended equipment
l A transfer pump with a 10-micron filter (such as the Model 590.01 Fluid Transfer Pump)
l ethanol or a similar cleaning solvent
l Lint-free cloths or manufactured rags
l A container for the used hydraulic oil and a small drain pan that will fit underneath the drain
plug
l A hydraulic fluid sampling kit (MTS part number 055-589-601).
l A new filter—see “Replacing the Return Line Filter”
Prerequisite
Perform the procedure “Sampling the Hydraulic Fluid” to determine if the hydraulic fluid should be
replaced.
Identify and correct any sources of contamination.
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