Model 612RBL-G2 thru 642RBL-G2 Clamshells
92-1739 Rev. 220506
33
Figure 18: Model 642RBL-G2 Jackscrews
Model 642RBL-G2
1. Tighten Jackscrews 3 and 8 to 10 ft-lb (14 Nm) of torque.
2.
Tighten Jackscrews 5 and 10 to 10 ft-lb (14 Nm) of torque.
3.
Tighten Jackscrews 1 and 6 to 10 ft-lb (14 Nm) of torque.
4.
Tighten Jackscrews 2 and 7 to 10 ft-lb (14 Nm) of torque.
5. Tighten Jackscrews 4 and 9 to 10 ft-lb (14 Nm) of torque.
All Clamshell Models
1. Verify that the Clamshell is mounted square and centered to the pipe.
2. Adjust the Jackscrews and Adjustable Bars in opposing pairs to correct any
off-center positioning.
3. After the Clamshell is mounted square and centered to the pipe, tighten the
Adjustable Bars and Jackscrews to 25 ft-lb (34 Nm) to 30 ft-lb (41 Nm) of
torque following the same sequence you used to set them up.
4. If you cannot rotate the Headstock with your hand with the motor(s) removed,
the Jackscrews and/or the Adjustable Bars are too tight. Loosen them before
you power up the Clamshell.