MTS Series 647 Hydraulic Wedge Grips - Manual (Page 68)

b) Adjust the actuator and crosshead position as necessary to allow adequate room to install the
environmental chamber and grips.
c) Turn the hydraulic pressure off.
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.
d) Lubricate all of the surfaces that will contact each other (screw threads, spacers, and so forth). See
“Temperature ranges” for the recommended lubricant.
e) Install the environmental chamber.
If the environmental chamber has a U-plug in the top and bottom of it, simply remove the U-plug and
move the chamber out of the way before installing the grips.
If no U-plug is present, the environmental chamber must be properly positioned before installing the
grips. See the environmental chamber product manual for installation instructions.
2. Note:
If the extension rods must be installed through the hole in the environmental chamber, remove the
fittings from the end of the hydraulic hard-line tubing which will pass through the hole and remove
any cooling water lines connected to the extension rods.
a) Slowly turn a connector stud into the end of the upper extension rod nearest the cooling water ports.
The connector stud should turn freely. If any resistance is encountered, disassemble and correct the
problem before proceeding.
b) Place a set of spiral washers over the connector stud on the upper extension rod. Rotate the washers
until they are fully closed (minimum thickness). If necessary, rotate the hydraulic hard-line tubing so
that the bend is against the extension rod.
c) Slowly screw the connector stud of the upper extension rod into the force transducer or crosshead until
it is snug against the spiral washers.
d) Align the upper extension rod as necessary for desired hose connector orientation. If the desired
orientation is not possible, remove the extension rod and install one or more shim washers between
the spiral washers and the force transducer or crosshead. Reinstall the extension rod.
e) Slowly screw a connector stud into the actuator rod. The connector stud should turn freely. If any
resistance is encountered, disassemble and correct the problem before proceeding.
f) Place a set of spiral washers over the connector stud in the actuator rod. Rotate the washers until they
are fully closed (minimum thickness). If necessary, rotate the hydraulic hard-line tubing so that the
bend is against the extension rod.
g) Slowly screw the extension rod onto the connected screw in the actuator until it is snugged tight against
the spiral washers.
h) Align the lower extension rod as necessary for desired hose connector orientation by rotating the
actuator rod. If the actuator rod does not rotate, remove the extension rod and install one or more shim
washers between the spiral washers and the actuator rod.
3. Mount the lower grip. Mount the lower grip to the extension rod connected to the actuator piston rod using
the appropriate stud, shims, and spiral washers.
68 Series 647 Hydraulic Wedge Grips Reference Manual
Installation