MTS Series 244 Actuators - Manual (Page 53)

Warning:
Do not exceed the maximum HPS 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 or personal injury.
It is necessary to temporarily exceed the tensile load capacity to achieve the requirements of
Step 5 in this procedure. This is accomplished by increasing the output pressure of the HPU.
Contact MTS Systems Corporation.
11. Turn on the system hydraulic pressure.
Note:
Be sure that 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.
13. If your test requires the maximum tensile load of the force train, you will need to adjust the output pressure
of the HPS to reach the required tensile load.
Caution:
If the spiral washers are not sufficiently tightened, the connector stud can break when subjected
to cyclic loads.
Follow the instructions in Step 13 and ensure that the spiral washers are properly tightened.
14. 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 (see the figure on the previous
page).
15. If more than a 30° arc is created, remove the tensile load from the specimen. Then remove the specimen
and the connector stud. Examine the connector stud for any signs of thread wear. If wear is noticed,
replace the stud and repeat Step 1 through Step 14.
Removing Fixtures with Spiral Washers
This procedure requires two spanner wrenches and assumes that you are familiar with all operating aspects
of your system.
Series 244 Actuators Product Information 53
Installation