MTS Series 647 Hydraulic Wedge Grips - Manual (Page 54)

f) 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.
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.
Mount the upper grip to the force transducer on the crosshead using the appropriate stud, shims, spacer,
or spiral washers. See
Axial-Torsional Grip Installation Components on page 45.
Note:
Ensure that the force transducer is properly aligned (see your load unit manual).
a) Thread the 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:
You will need to construct a proper support or have someone available to help balance the upper
grip on the lower grip.
c) Carefully position the grip on top of the wooden spacer on the lower grip.
You might need to insert the double swivel eyebolts into the threaded holes on the grip chamber. Attach
a lifting device to the double swivel eyebolts and position the grip on top of the lower grip.
d) With the connector stud facing up, add any required shims, spacers, or spiral washers to the stud.
e) Turn on hydraulic pressure and slowly raise the lower grip until the stud on the upper grip just makes
contact with the force transducer. Reposition the grip, as necessary, for proper thread alignment.
f) Slowly screw the grip into the force transducer until it is snug.
4. Align the grip wedge openings. See “Align the Wedge Openings” for more information.
Align the lower grip as necessary for the desired hose connection and wedge opening orientation. If the
actuator rod cannot be rotated, remove the lower grip and install one or more shim washers between the
spiral washers and the lower element of the force train. Reinstall the grip (go to Step 2).
Align the upper grip wedge opening with the lower grip wedge opening. If proper alignment is not possible,
remove the upper grip and install one or more shim washers between the spiral washers and the upper
element of the force train. Reinstall the grip (go to Step 3).
5. Connect the hydraulics.
54 Series 647 Hydraulic Wedge Grips Reference Manual
Installation