R 50 Ton—6” plate variation—three tension positions. First two inches of
plate thickness use maximum tension position. Second two inches of plate
thickness use intermediate tension position. Third two inches of plate thick-
ness use minimum tension position.
Example: Clamp rated 6” to 12” plate thickness use maximum tension on
plates 6” to 8” thick. Use intermediate tension on plates above 8” to 10” thick.
Use minimum tension on plates above 10” to 12” thick.
R 75 Ton and R 100 Ton—6” plate variation—four tension positions. First
one and one-half inches of plate thickness use maximum tension position.
Second one and one-half inches use next to maximum tension position. Third
one and one-half inches of plate thickness use next to minimum tension posi-
tion. Fourth one and one-half inches of plate thickness use minimum tension
position.
Example: Clamp rated 8” to 14” plate thickness use maximum tension on
plate 8” to 9 1/2” thick. Next to maximum tension position on plates above 9
1/2” to 11” thick. Next to minimum tension position on plates above 11” to 12
1/2” thick and minimum tension position on plate above 12 1/2” to 14” thick.
Spring now exerts force on gripping cam.
WARNING: Lift only when clamp is in “Lock Closed” position.
Models with “Lock Open Only” feature: Remove lock stop pin, permitting grip-
ping mechanism to engage plate. Refer to Illustration B, Step 5.
Apply a lifting force to the lifting shackle until gripping surfaces of the clamp
are in full contact and exerting a force on the plate.
WARNING: A constant force must be maintained on the lifting shackle
throughout the entire operation.
Step 9.
Commence lift.
WARNING: The operator should position himself away from and fully
clear of the member to be lifted. Do not commence lift until all person-
nel are clear of the area of the lift. Never stand under or near a member
being lifted.
