MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-180 - Manual (Page 97)

Replacing the Optional High-Pressure Filter
Model 505.60 - 505.180 SilentFlo™ HPU Maintenance 97
Required equipment
• Filter element (MTS part number 100-029-989)
• O-ring (MTS part number 010-010-927)
Procedure
To change the filter element:
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
1. Turn off the HPU. Ensure that the hydraulic pressure is at zero before
proceeding.
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 110 N•m (84 lbf-ft).
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)
Required equipment
You will need a filter element (MTS part number 010-053-305) and seal kit
(MTS part number 011-425-803). Also available is the O-ring used at the base
inlet and outlet (MTS part number 010-010-907).
WARNING