MTS Series 646 Hydraulic Collet Grips - Manual (Page 55)

Series 646 Hydraulic Collet Grips Operation 55
Installing a Collet for a Round Specimen
To install a collet assembly for a round specimen into the grip housing:
Round Collet
1. Ensure that the grips are in the release condition and that hydraulic pressure
is turned off.
2. Clean the specimen contacting surfaces of the collet with acetone or any
other volatile solvent that does not leave a residue.
3. Apply a thin layer of Molykote G·n paste (part of the grip service kit) to the
threaded surfaces of the collets.
4. Use a spanner wrench to thread the collet assembly into the grip housing
until the top surface of the collet is flush with the top surface of the grip
housing.
5. Adjust the collet assembly as necessary until the alignment mark on the
collet corresponds to the alignment mark on the grip housing. Use a hex key
wrench to thread the socket head cap screw with bumper into the threaded
hole in the grip piston.
Top View
Cutaway
Side View
Spanner
Wrench Holes
Alignment
Mark
Coat the threads on
the collet with
Molykote G-n paste
Bumper
Collet Retainer
Socket Head
Cap Screw