MTS Series 201 Actuators - Manual (Page 33)

Removing Accessories with Spiral Washers
Series 201 Actuator Product Information 33
Do not exceed the maximum HPU output pressure or apply a force greater
than any force train component capacity.
Exceeding the tensile load capacity of any element in the force train can
cause equipment damage and/or personal injury.
It is necessary to temporarily exceed the tensile load capacity to achieve the
requirements of Step 12 in this procedure. This is accomplished by increasing the
output pressure of the HPU. For more information, contact MTS Systems
Corporation.
11. Turn on the system hydraulic pressure.
Note Be sure all components in the force train can accommodate the required
tensile load.
12. Apply a static tensile load 10%–20% higher than the maximum load to be
applied during testing.
If your test requires the maximum tensile load of the force train, you will
need to adjust the output pressure of the HPU to reach the required tensile
load.
If the spiral washers are not sufficiently tightened, the connector stud can
break when subjected to cyclic loads.
Perform the appropriate procedure to ensure that the spiral washers are properly
tightened.
13. Using the spanner wrenches, rotate the spiral washers in opposite directions
to tighten them. The opening between the washers must not exceed an arc of
30° from the closed position.
If more than a 30° arc is created, remove the tensile load from the actuator.
Then remove the connector stud. Examine the connector stud for any signs
of thread wear. If wear is noticed, replace the stud and repeat the previous
procedure.
Removing Accessories with Spiral Washers
The procedure requires two spanner wrenches and assumes that you are familiar
with all operating aspects of your system.
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.
WARNING
CAUTION