MTS Series 647 Hydraulic Wedge Grips - Manual (Page 84)

2. Using the utility packing hook, disconnect both springs from the spring posts on the corresponding wedge.
It is not necessary to remove the springs from the spring anchors.
3. Inspect the springs and replace them, if necessary.
4. Remove the wedge by sliding it towards the center of the grip and then lifting it out of the grip.
5. Repeat Steps 2 and 3 for the remaining wedges.
6. Apply a thin coat of lubricant to the edges of the wedge which contact the chamber and piston; see
“Temperature ranges” for information about the temperature ranges and restrictions.
7. Place the wedge into the center of the grip and then slide it towards the chamber.
8. Using the utility packing hook, connect the springs from the spring anchor on the grip piston to the spring
post on the corresponding wedge.
9. Repeat Steps 6 and 7 for the remaining wedges.
Change Wide Wedges
Perform the following procedure to replace a narrow wedge set with a wide wedge set, or a wide wedge set
with another wide wedge set. Each wedge is labeled with the wedge part number and manufacturing date
code. Ensure that replacement wedges are a matched set (four wedges) before attempting to install the
wedges into the grip.
Description Item Description Item
Spring Anchor 5 Chamber 1
Wire Cables 6 Wedges 2
Cap Screw 7 Spring 3
Wedge 8 Piston 4
1. Remove any specimen installed in the grips. Leave both grip controls in the release position. Position the
actuator or crosshead as necessary for convenient access to the grip wedges. Remove system hydraulic
pressure and grip supply pressure.
84 Series 647 Hydraulic Wedge Grips Reference Manual
Operation