Manitowoc GROVE RT890E Operator's Manual page 77

RT890E
22. Move the lifting limit switch from the head of the main
boom to the head of the 33 ft (10.1 m) section.
23. Reeve the hoist cable on the hook block.
24. Attach the lifting limit switch weight and guide hoist rope
through the weight.
Checklist: Unrigging the 56 ft (17.1 m) two-
stage swingaway lattice extension
1. Prepare the crane for unrigging.
2. Retract the main boom completely and lower it into he
horizontal position.
3. Remove the lifting limit switch weight and move lifting
limit switch from the head of the 23 ft (7 m) section to the
head of the main boom.
4. Unreeve the hoist cable from the hook block and remove
it from the lattice extension.
5. Remove hoist rope from the head sheave and guide it to
the ground on the left-hand side of the lattice extension.
NOTE: If the 23 ft (7 m) section needs to be removed and
only the 33 ft (10.1 m) section at the side of the
main boom needs to be folded, proceed to point 12.
6. Attach the guide rope to the head of the 23 ft (7 m)
section.
SET-UP AND INSTALLATION
7. Remove the locking pins on the left-hand side between
23 ft (7 m) section and 33 ft (10.1 m) section.
8. Swing the 23 ft (7 m) section in front of the 33 ft (10.1 m)
section.
9. Move the connection in the middle area 23 ft (7 m)
section/33 ft (10.1 m) section.
10. If the 23 ft (7 m) section needs to be removed, attach 23
ft (7 m) section on the auxiliary crane, remove all locking
pins between the 23 ft (7 m) section and the 33 ft (10.1
m) section and place 23 ft (7 m) section on a separate
vehicle.
11. Fold in both deflection sheaves on the 33 ft (10.1 m)
section.
12. Reel hoist cable up to the main boom head.
13. Attach the guide rope to the head of the 33 ft (10.1 m)
section.
14. Remove the left-hand locking pin between the 33 ft (10.1
m) section and the main boom head.
15. Raise the main boom completely.
16. Swing the lattice extension onto the main boom.
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