MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-11 - Manual (Page 58)

Model 505G2.07/.11 SilentFlo™ HPU 58
Replacing the Return Line Filter
6. Wipe out any remaining sludge in the filter housing with a lint-free cloth.
7. Inspect the O-rings in the manifold for any sign of deterioration. If
necessary, replace the defective O-ring(s).
8. Insert a new filter element into the bowl and reinstall the bowl assembly.
Align the 90° elbow outlet at the bottom of the assembly such that it directs
hydraulic fluid flow towards the side of the reservoir as shown in the
following illustration. Screw the filter cover back on.
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.
Align the 90° elbow outlet at the bottom of the assembly such that it directs hydraulic fluid
flow in the direction of the arrow in the graphic above.