Chapter 3: Additional System Details
30 M47-17028-EN
Hydraulic grip actuation - G7-style crossheads
For G7-style crossheads, the grip assemblies are actuated hydraulically. Components of the grip
assemblies are illustrated in Figure 11. The operator uses a grip control handset (Figure 12 on
page 32) to operate a hydraulic piston that is inside the crosshead. A push plate (17) is mounted to the
piston. As the piston is extended, the push plate lifts the jaw carriers (5) in the grip pocket (15). The
wedge shape of the grip pocket forces the jaw carriers and grip jaws to close and clamp the specimen.
The grip jaws are held to the jaw carriers by either magnets or retainer setscrews, depending on the frame
model. 300DX frames use magnets that are mounted in the jaw carrier recess (5a). The locating
boss (4a) fits into the jaw carrier recess and is held by the magnet. 600DX frames use retainer
setscrews (13) that are mounted in the jaw carrier. The locating boss (4a) fits into the jaw carrier
recess (5a) and the retainer setscrew is tightened against the retainer button (4b). The retainer
setscrews are tightened and loosened through an access hole (14) in each front guide plate (6). It is not
necessary to remove the guide plate to adjust the retainer setscrew.
The oil required to operate the hydraulic piston is supplied by the HPS. The oil is directed to each
crosshead by means of a hydraulic grips manifold mounted in the frame base. Once the oil reaches the
crosshead, the oil is routed through a speed control manifold and to the hydraulic piston.
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