MTS Series 647 Hydraulic Wedge Grips - Manual (Page 43)

2. Mount the lower grip to the actuator piston rod. Thread the stud into the lower grip. The connector stud
should turn freely. If any resistance is encountered, disassemble and correct the problem before proceeding.
a) Add any required shims, spacer, or spiral washers to the stud.
Note:
The attachment kit drawing shows what components (such as shims, spiral washers, etc.) should
be installed.
b) Position the lower grip to align it with the connecting stud and stabilize the grip.
• Place appropriately sized wood blocks across the load unit base plate, on opposite sides of the
actuator piston rod.
• For heavy grips, insert the double swivel eyebolts into the threaded holes provided on the grip
chamber. Attach a lifting device to the double swivel eyebolts and carefully raise the grip.
c) Turn on hydraulic pressure and raise the actuator rod until it just makes contact with the connector
stud. Reposition the grip, as necessary, to center the stud over the actuator rod.
d) Slowly screw the grip into the actuator rod, raising the actuator rod as you go, until it is snug. The
connector stud should turn freely. If any resistance is encountered, disassemble and correct the problem
before proceeding.
e) Turn the hydraulic pressure off.
Ensure that system hydraulic pressure has been reduced to zero before proceeding. To do this, turn
off the hydraulic power unit and exercise the actuator until it stops moving.
3. Mount the upper grip to the force transducer on the crosshead.
Note:
Ensure that the force transducer is properly aligned (see your load unit manual).
a)
Warning:
The upper grips are very top heavy and will have a tendency to tip over when lifted by the
double swivel eyebolts.
Dropped grips can cause injury to personnel and damage to equipment.
Never attempt to control the grip by holding onto the eyebolts. Use the connector stud to
help control the grip balance.
Thread a stud into the upper grip.
b) Place a wooden spacer (a wood block or piece of plywood) on top of the lower grip. The wooden spacer
should be large enough to cover the diameter of the grip.
Note:
The upper grip might need help to balance it on the wooden spacer on the lower grip.
c) Carefully position the grip on top of the wooden spacer on the lower grip.
Series 647 Hydraulic Wedge Grips Reference Manual 43
Installation