MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-180 - Manual (Page 84)

Replace the Capscrew-Style Housing Filter
1. Turn off the HPU. Ensure that the hydraulic pressure is at zero before proceeding.
Caution:
The system pressure does not immediately drop to zero when the HPU is turned off.
Residual pressure can produce a high pressure spray that can hurt you.
Do not start this procedure until all pressure gages read zero.
2. Unlock and open the small cover next to the electrical enclosure to access the filter assembly.
3. Remove the four cap screws that secure the filter cap to the filter housing.
4. Remove the spring, bypass valve assembly, and filter element. Discard the dirty element according to
local environmental codes.
5. Clean the bypass valve and spring, as needed.
6. Check the filter housing for signs of serious contamination such as large pieces of grit, rubber particles,
and metal shards.
7. Find and correct the cause of this contamination before operating your system again.
8. Install the new filter element, bypass valve, and spring.
9. Reinstall the filter cap. Make sure that its O-ring has remained in place. Torque the four cap screws to 53
N-M (39 ft-lb).
10. Apply low pressure and check for leaks.
Replacing the Optional High-Pressure Filter
The high pressure filter element of the HPU should be replaced for the following reasons:
• When the electric dirt alarm goes off
• Whenever the hydraulic fluid is changed
• The filter manufacturer’s recommended maximum interval (1000 hours or 6 months)
84 Series 505G2 SilentFlo™ Hydraulic Power Unit Product Information
Maintenance