MTS Series 252 Servovalves - Manual (Page 31)

Five-Port Operation—252.3x Servovalve
Series 252 Servovalve Product Information Installation 31
A. Use the threaded screw driver (#2 -56) to connect to the plug. Push the
plug into the secondary port until it seats into the port
.
B. Remove the threaded screw driver from the plug.
C. Use a 1/8 inch Allen driver to install the Allen set screw removed in
Step B into the secondary filter port.
5. Reassemble the filter.
A. Lightly lubricate the filter O-ring with clean hydraulic fluid and insert
the filter into the housing.
B. Lightly lubricate the filter plug O-rings with clean hydraulic fluid and
install the filter plug.
C. Secure the filter cover plate to the housing using the four socket head
screws and washers removed in Step 3E. Tighten each socket head
screw until it is firmly seated against the filter cover plate. Using the
sequence shown here, tighten the socket head screws to 14 N·m (10
lbf·ft). Continue using the sequence and tighten the socket head screws
to a final torque of 34-41 N·m (25-30 lbf·ft)
D. Turn on electrical and hydraulic system power.
E. Apply low hydraulic pressure to the servovalve so that hydraulic fluid
will gradually fill the filter cavity.
F. Apply high hydraulic pressure and check for leaks at the servovalve
hydraulic connections and at the base of the servovalve.
Secondary filter port Secondary filter port
1
2
3
4