MTS Series 247 Actuators - Manual (Page 31)

Spiral Washers
Series 247 Actuators Installation 31
Installing Fixtures with Spiral Washers
The procedure requires two spanner wrenches and assumes you are familiar with
all operating aspects of your system.
Note Sometimes you might have multiple fixtures in the force train that have
different force ratings. When installing the fixtures pretensioned with
spiral washers, install the fixtures with the lowest force rating first. Then
install any other fixtures from the lowest to the highest force rating.
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. Clean the connector studs and the internal threads of the force train
element(s). Inspect the thread mating surfaces for signs of contamination or
corrosion. All damaged threads should be repaired or the component
replaced.
3. Apply a thin layer of Molykote ® G paste, or equivalent, to all thread mating
surfaces.
4. When installing a load cell, place a small piece of compliant material (such
as a styrofoam bead) inside the load cell to keep the stud from contacting the
bottom of the hole.