Chapter 3: Operation
46 M47-17027-EN
Install grip jaws - G1-style crossheads
Equipment and supplies required
• A suitable stable platform such as a man-lift, stairs, or ladder. The platform must be of sufficient
height so that the operator can reach the tension crosshead.
• Hex keys, see Table 11 on page 49 for sizes
• Molykote type GN metal paste
Recommended procedure
1. Remove the grip stop plate (5, Figure 10) from the top of the tension crosshead by removing the two
socket head cap screws (6) that hold the plate to the crosshead (use hex key stated in Table 11).
2. Be sure a jaw retainer (7) is installed on each grip jaw as shown in Figure 10 (use hex key stated in
Table 11).
3. Lubricate the rear and sides (the smooth surfaces that come into contact with the grip pocket or filler
plate) of each jaw with Molykote type GN metal paste. Apply lubricant liberally. DO NOT apply
lubricant to the specimen gripping surface.
All equipment must be supplied by the customer unless noted as “supplied”. For a list of equipment that
was supplied with the system, refer to “Ancillary parts” on page 87.
Be careful not to injure fingers or hands when installing or removing grip jaws. Grip jaws
typically weigh at least 3.2 kgs (7 lbs).
Grip jaws come as matched pairs. It is important that grip jaws are installed into the grip pockets as a
matched pair. If they are not installed as matched pairs, the grips will not function. Matched pairs can
be determined by placing the gripping teeth faces together as depicted below. Place each matched pair
into the appropriate crosshead so that the rack teeth meet with the pinion.
For grip jaws with horizontal rack teeth:
Place the gripping teeth faces of the
grip jaws together so that a “V” is formed.
When a “V” is formed, the rack teeth faces of each grip jaw
should be on the same side.
For grip jaws with angled rack teeth:
Top view
Front view
Upper left
Lower left
Upper right
Lower right
Gripping teeth faces
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