MTS Series 646 Hydraulic Collet Grips - Manual (Page 47)

Series 646 Hydraulic Collet Grips Installation 47
7. Using spanner wrenches, rotate the two halves of the spiral washers in
opposite directions to tighten them as shown in the following figure. The
opening between the washers must not exceed an arc of 30° from the closed
position.
If more than a 30° arc is created:
A. Remove the tensile load from the specimen.
B. Remove the specimen (see the appropriate procedure).
C. Tighten the grips on the mounting studs, or place a shim on the stud.
D. Repeat Steps 5 through 7 of this procedure.
Connector Stud and Spiral Washers
8. Reduce tensile force to zero and remove the specimen.
9. Remove system hydraulic pressure. Ensure that system hydraulic pressure
has been reduced to zero before proceeding.
(Do not exceed.)
Connector Stud
Decrease Thickness
Increase Thickness
Medium
Thickness
Connector
Stud