MTS Landmark Tabletop - Manual (Page 102)

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.
Prerequisites
You must have a filter kit that contains the necessary filter element replacement parts. The filter for the Model
252.3x Servovalves is MTS part number 032-844-101. The filter for the revision G Model 252.2x/4x servovalves
is MTS part number 100-098-436. MTS does not recommend field replacement of filters in earlier revision
servovalves.
Replace the Servovalve Filter Element
Refer to the following figure during the procedure. Care should be exercised to prevent dirt or other
contaminants from entering the servovalve body, filter passages, or manifold/actuator ports.
102 MTS Landmark™ Tabletop Load Units Product Information
Maintenance