MTS Series 647 Hydraulic Wedge Grips - Manual (Page 83)

Change/Install Wedges
Change Model 647.02 - 647.100 Wedges
Standard and optional wedges are available for the grips. The standard wedges include:
• Narrow flat wedges for flat specimens.
• Round wedges for specific diameter round specimens.
• Vee-notched wedges for round specimens in general.
The optional wedges include wide wedges for flat, full width specimens. See “Specifications” for a listing of
all available wedges.
Caution:
The wedges can rust.
Over time, rust can damage the wedges.
Use cloth or latex gloves when handling the wedges. Also coat the wedges with LPS (a rust
preventative oil) and place them in their original packing material for storage.
Required equipment
• A utility hook (provided in the tool kit supplied with the grip)
• Replacement extension springs, if necessary
• Two 50-cm (20-in) length of wire cable, for wide wedges
• Lubricant
Change Standard Wedges
Perform the following procedure to replace one type of narrow wedge with the other, or a narrow wedge with
a 38.1 mm (1.5 in) wide wedge.
Note:
Additional considerations are required when testing rebar or wire rope. See “Wedges and Inserts for
Rebar and Wire Rope” for additional information.
Note:
Each wedge is labeled with the wedge part number and manufacturing date code. Ensure that
replacement wedges are a matched set before attempting to install the wedges into the grip.
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.
Series 647 Hydraulic Wedge Grips Reference Manual 83
Operation