Maintenance
64 Series 505G2 SilentFlo™ Hydraulic Power Unit
Model 505.07 HPU Top View
9. Turn on the HPU and switch to high-pressure mode. Inspect the seal between the housing
and the manifold for any signs of leakage. If leakage occurs, repeat this procedure (without
replacing the filter element). If leakage persists, contact MTS Systems Corporation.
10. If you are changing the filter because the dirty filter indicator tripped, run the HPU for two to
four hours to remove contaminants. Then take a fluid sample and have it analyzed.
Continue to clean the fluid if it does not meet an ISO cleanliness level of 13/9 or better.
11. Press the Reset button on the HPU control panel to reset any interlocks and turn off the Dirty
Filter indicator.
Sample the Hydraulic Fluid
This section describes how to check the quality of the hydraulic fluid. Review the following hints before
obtaining your sample:
l Avoid contamination.
l Keep the sample bottle in the storage box of the hydraulic fluid sampling kit until it is
needed.
l Do not remove the cap from the bottle until immediately before taking the sample.
l Do not set the cap down on a dirty surface or in an area where airborne dust can
settle.
l For additional information on hydraulic fluid care, see the Hydraulic Fluid Care Guide (part
number 050-000-536) found in the documentation package inside the electrical control box.
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