MTS Series 252 Servovalves - Manual (Page 25)

252 Servovalve Installation
Series 252 Servovalve Product Information Installation 25
Installation
The servovalve can be installed on an actuator or a Series 256 Servovalve. This
section includes the following:
252 Servovalve Installation 25
252 Servovalve Cable Connections 28
Five-Port Operation—252.2x Servovalve 29
Five-Port Operation—252.3x Servovalve 30
Important If you are replacing an existing servovalve and you encounter any
component interference or alignment issues, contact MTS
Technical support. Trying to reposition components without
knowing the ramifications can cause equipment damage.
252 Servovalve Installation
The actuator has a manifold that aligns the hydraulic ports of the servovalve with
the hydraulic ports on the actuator. Almost all servovalves are installed onto an
adapter manifold. A servovalve may be installed onto an actuator only if the
servovalve ports align with the ports of the actuator.
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. Turn off electrical power at the controller.
2. Remove the servovalve protective cover plate (attached to the bottom of the
servovalve). If replacing the servovalve, remove the cover plate from the
actuator.
3. Ensure that the O-rings between the servovalve and actuator, manifold, or
secondary servovalve are lubricated with a light film of hydraulic fluid and
are in their correct position.
4. Position the servovalve on the actuator, manifold, or secondary servovalve,
aligning the locating pin on the servovalve with the locating hole on the
actuator, manifold, or secondary servovalve. The servovalve cannot be
installed without proper alignment. See the following figure for the location
of the locating pin.