MTS Series 647 Hydraulic Wedge Grips - Manual (Page 53)

Description Item Description Item
Spiral Washer Set 9
1.
Warning:
Grip installation is dangerous because it occurs within the crush zone of the force train while
full hydraulic pressure is applied and actuator movement is required during the installation.
Unexpected actuator movement can cause personal injury and damage to the equipment.
Take every precaution to avoid unexpected actuator movement while installing the grips.
Set up the load unit.
a) Turn on the system hydraulic pressure.
b) Adjust the actuator and crosshead positions as necessary to create adequate room to install the grips.
c) 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.
d) Clean and lubricate all of the surfaces that will contact each other (screw threads, spacers, and so
forth).
2. Mount the lower grip to the actuator piston rod using the appropriate stud, shims, spacer, or spiral washers.
a) Place a small piece of compliant material in the threaded hole of the grip and 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.
b) Add any required shims, spacer, or spiral washers to the stud.
The attachment kit drawing shows what components (such as shims, spiral washers, and so forth)
should be installed.
c) 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.
d) 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.
e) 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.
Series 647 Hydraulic Wedge Grips Reference Manual 53
Installation