MTS Series 311 Load Frame - Manual (Page 40)

Series 311 Load Frame 40
Removing the Shipping Collars
Installation
Removing the Shipping Collars
When the load frame is shipped, the crosshead is clamped in position with
shipping collars.
The collars should not be removed unless the lift cylinders have been bled, full
hydraulic power has been applied to the crosshead, and the crosshead lock
control is in the lock position.
Once the collars have been removed, they should be kept rather than discarded.
The collars can be installed on the columns below the crosshead and used as
stops to limit the crosshead travel should the crosshead fall. The collars are also
used to mechanically restrain the crosshead during some maintenance
procedures.
The crosshead can slowly drift down the columns if the locks are turned off
and when hydraulic pressure is turned off.
The crosshead can damage any test fixtures, grips, and specimen in its
path.
Unlock the crosshead only to reposition it. Always lock the crosshead after you
have repositioned it and never leave the crosshead unlocked.
Note If the shipping collars are being used as stops to limit the crosshead
travel should the crosshead fall, they should be removed before
positioning the crosshead and reinstalled after the crosshead has been
repositioned.
CAUTION