MTS Series 647 Hydraulic Wedge Grips - Manual (Page 64)

Note:
Ensure that you stabilize the wedge assembly while you install it.
d) Position the upper wedge assembly in the environmental chamber, using a lifting device if needed.
e) Place the upper wedge chamber on the wood block.
f) Remove the lifting strap and eye bolts.
g) Turn on hydraulic pressure.
h) Adjust the actuator to raise the upper wedge chamber until it contacts the upper cylinder.
i) Rotate the wedge chamber until you feel the threads engage. Slowly screw the cylinder into the piston
extension.
9. Align the grip wedge openings.
Go to “Align the Wedge Openings” to align and tighten the grips, and then return to this procedure.
The upper and lower grips must be aligned so that the wedge openings are parallel (within ±1°).
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.
10. 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).
• 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.
• The Model 647.25/.50/.100 Hydraulic Wedge Grip requires hydraulic pressure of 69 MPa (10000 psi).
This grip must be connected to a Model 685.10 or 685.60 Hydraulic Grip Supply.
a) 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.
b) Using the provided hydraulic hose, make connections between the pressure (labeled “P”) and release
(labeled “R”) fittings on the upper hydraulic chamber and the pressure and release outlets for the upper
grip on the hydraulic grip supply.
c) Using the provided hydraulic hose, make connections between the pressure (labeled “P”) and release
(labeled “R”) fittings on the lower hydraulic chamber and the pressure and release outlets for the lower
grip on the hydraulic grip supply.
11. If necessary, connect the water supply. Water is used to heat or cool the grips.
64 Series 647 Hydraulic Wedge Grips Reference Manual
Installation