MTS Landmark Floor Standing - Manual (Page 107)

Kit Number Part Number Filter
044-205-201 011-395-936 10 micron (Beta
7.4
= 75)
Change the HSM Filter
1. Ensure that system hydraulic pressure has been reduced to zero before proceeding. To do this, turn off
the hydraulic power unit and exercise the actuator until it stops moving.
2. Turn off electrical power at the controller.
3. Place a waste fluid pan beneath the filter housing, which will accumulate any small amount of drainage
from the filter housing.
4. Remove the inlet filter bowl.
5. Remove the disposable filter element from the filter bowl.
6. Empty the oil in the filter bowl into the pan. Wipe out any remaining sediment with a clean lint-free cloth.
7. Inspect the O-ring in the filter housing for any sign of deterioration. If necessary, replace the defective
O-ring (part number 010-010-726).
8. Lubricate the filter element and filter housing O-rings with clean hydraulic fluid. Insert the replacement
filter element into the filter bowl. Tighten the filter bowl to 34–41 N·m (25–30 lbf·ft).
9. Apply low, then high, hydraulic pressure to the actuator manifold and inspect the seal between the filter
bowl and housing for any signs of leakage. If leakage exists, turn off system hydraulic and electrical power
and repeat Steps 4 through 9.
252 Servovalve
Maintaining the Series 252 Servovalves typically involves changing the filter element (Series 252.3x only)
and setting the mechanical null adjustment. Except for these procedures, further disassembly, inspection, or
repair of the servovalve is not recommended and may void the servovalve warranty.
MTS does not recommend changing the 35-micron filter element in the Series 252.2x/.4x Servovalve (revision
C). MTS hydraulic power supplies filter the system hydraulic fluid at 3-microns absolute. The system filters
will trap most solid particle contaminants. If servovalve performance has deteriorated and the cause has been
isolated to the servovalve filter, return the servovalve to MTS for service.
Replacing the Servovalve Filter Element
Under normal operating conditions, the 20-micron stainless steel filter used in the servovalve should be
replaced only if servovalve performance has deteriorated. Ensure that other possible causes of poor
performance, such as plugged system filters or hydraulic power unit wear, have been eliminated before
replacing the servovalve filter.
MTS Landmark™ Floor Standing Load Units Product Information 107
Maintenance