MTS Series 647 Hydraulic Wedge Grips - Manual (Page 85)

2. Remove the specimen guide from flat wedges.
3. Remove the wedge set from the grip as follows:
a) Using the utility packing hook, disconnect both springs from the spring posts on the corresponding
wedge.
b) It is not necessary to remove the springs from the spring anchors. However, inspect the springs and
replace them, if necessary.
c) Remove the wedge by sliding it towards the center of the grip and then lifting it out of the grip.
d) Repeat Step A through Step C for the remaining wedges.
4. Apply a thin coat of Molykote G·n lubricant to the edges of the replacement wedge which contact the
chamber and piston.
5. Thread a 50 cm (20 in) length of wire cable (two required) through the eye on the free end of each spring.
6. Thread the free ends of each cable loop through the respective spring holes in the wedge.
7. While holding the ends of both cables, guide the wedge into the grip such that the springs will enter the
spring holes.
8. With the wedge seated in the grip, pull on one pair of wire cable ends. Pull the spring tight until a cap
screw can be inserted through the spring eye. Tighten the cap screw.
9. Repeat Step 8 for the remaining spring.
10. Repeat Steps 4 through 9 for the other wedges.
11. For flat wedges, install the specimen guide.
Wedges and Inserts for Rebar and Wire Rope
When you change wedges to accommodate different sizes of rebar or wire rope, use the same procedure
used to change standard wedges; see “Wedges for Testing Rebar” and “Change Standard Wedges.”
Series 647 Hydraulic Wedge Grips Reference Manual 85
Operation