MTS Series 647 Hydraulic Wedge Grips - Manual (Page 70)

Note:
The upper grip might need help to balance it on the wooden spacer on the lower grip.
d) Carefully position the grip on top of the wooden spacer on the lower grip. You might need to insert
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.
e) With the connector stud facing up, add any required shims, spacers, or spiral washers to the stud.
f) Turn on hydraulic pressure and slowly lower the crosshead until the stud on the upper grip just makes
contact with the extension rod connected to the force transducer. Reposition the grip as necessary for
proper thread alignment.
g) Slowly screw the grip into the force transducer until it is snug.
5. Align the grip wedge openings.
See “Align the Wedge Openings” and check the alignment between the upper and lower grips.
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.
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.
6. Connect the hydraulics. Typically, the shorter set of hard-line tubing is attached to the extension rod
connected to the fixed end of the force train (the crosshead); the longer set is attached to the extension
rod connected to the moving end (the actuator rod).
Note:
The Model 647.02 and 647.10 Hydraulic Wedge Grips require hydraulic pressure of 21 MPa (3000
psi). These grips can use the hydraulic power from the load unit or from a Model 685.22 Hydraulic
Grip Supply.
Note:
The Model 647.25/.50/.100 Hydraulic Wedge Grip requires hydraulic pressure of 69 MPa (10000
psi). These grips must be connected to a Model 685.10 or 685.60 Hydraulic Grip Supply.
a) Loosely attach the hydraulic hard-line tubing to the extension rods using the clamps provided.
b) 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.
c) Adjust the position of the hard-line tubing to allow the fittings to mate with the grip pressure and release
ports.
d) Make connections between the pressure (labeled “P”) and release (labeled “R”) fittings on the upper
extension rod and the pressure and release outlets for the upper grip on the hydraulic grip supply.
e) Make connections between the pressure (labeled “P”) and release (labeled “R”) fittings on the upper
extension rod and the pressure and release outlets for the upper grip on the hydraulic grip supply.
f) Tighten the hard-line tubing clamps to secure the tubing to the extension rods.
70 Series 647 Hydraulic Wedge Grips Reference Manual
Installation