MTS Series 256 Servovalve - Manual (Page 24)

Series 256 Servovalve Product Information 24 Installation
• For Models 256.04/.09/.18, tighten the screws to 47.45 N·m
(35 lbf·ft)
• For Models 256.25/.40, tighten the screws to 146 N·m (108 lbf·ft).
6. As you tighten the screws, those previously tightened will lose clamping
force. Continue tightening until all screws are at the specified torque.
7. Mount the main stage manifold onto the main stage body and line up the
mounting holes.
8. See the procedure for mounting the pilot stage in order to continue the
installation procedure.
Mounting Screw Locations
How to Mount the Pilot Stage
To mount the pilot stage (a Series 252 Servovalve) to a main stage manifold:
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. Remove the cover plate or existing pilot stage from the manifold.
3. Ensure that the O-rings between the pilot stage and main stage manifold are
lubricated with a light film of hydraulic fluid and are correctly positioned.
Spool Stop
Pilot Stage Mounting
Drain End Cap
LVDT End Cap
LVDT Adjustment
LVDT Locknut
Main Stage Mounting