Routine Maintenance Overview Checklist
318 Load Unit Maintenance
101
Procedure To replace the filter element, perform the following procedure. Care should be
exercised to prevent dirt or other contaminants from entering the servovalve
body, filter passages, or manifold/actuator ports. Refer to the following figure
during the procedure.
10. 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 to the controller.
For the Series 252.2x/4x Servovalve proceed as follows:
Note This procedure only applies to revision G of the servovalve.
A. Remove the four socket head screws and washers that secure the filter
cover plug.
B. Thread one of the socket head screws, removed in Step A, into the filter
cover plug and pull it out of the filter housing.
C. Remove the filter disk.
1
4
3
2
Socket Head
Screws (4)
Filter Cover
Plate
Filter Plug
Filter Plug
O-Rings
Filter O-Ring
Filter
Filter Housing
Filter Cover
Model 252.2x/.4x Filter Location
(Revision G only)
Model 252.3x Filter Assembly
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