BOOM GRT8100 SERVICE MANUAL
4-4
Published 3/26/2018, Control # 596-05
MAINTENANCE
Removal
NOTE: The boom assembly must be rotated 180° (upside
down) before performing any assembly or
disassembly procedures.
.
NOTE: The boom may be disassembled with the base
section left on the crane if repair of the base section
is not necessary.
NOTE: Boom weighs approximately 12,500 kg (27,550 lb).
Removal of the swingaway boom extension will
simplify boom removal; therefore, the above weight
is for the boom without the swingaway boom
extension attached.
1. Extend and set outriggers to level the crane. Ensure
boom is fully retracted and in a horizontal position over
front of the crane.
2. If equipped, remove the swingaway boom extension
according to the removal procedures in this section;
refer to Hook Block, page 4-56.
3. Remove hook block or headache ball and wind all wire
rope onto the hoist drum.
4. Elevate boom slightly to allow for withdrawal of the lift
cylinder rod end from the lift cylinder attach fitting on the
bottom of the boom.
5. Attach a lifting device to the boom that provides for equal
weight distribution.
6. Disconnect any electrical wiring from the boom.
7. Tag and disconnect hydraulic lines to the telescope
cylinder. Cap/plug all openings.
8. Block the lift cylinder.
9. Remove the capscrews, washers, and end plate
securing the upper lift cylinder shaft to the side of the
attachment fitting on the boom.
10. Remove the upper lift cylinder shaft.
11. Activate hydraulic system and retract the lift cylinder rod
enough to clear the attachment fitting. For removal of the
lift cylinder from the crane, refer to Lift Cylinder
Removal, page 4-54.
NOTE: Shut down crane before proceeding.
12. Take up slack on the boom lifting device.
13. Remove capscrew, washer, and nut that passes through
the end of the weld pin that secures the boom pivot pin in
place, then remove the weld pin. Remove grease fitting
from each end of the boom pivot shaft, then remove
boom pivot shaft.
14. Raise boom clear of crane and lower to ground level. Set
cribbing under base section to level boom for service.
CAUTION
A rollover fixture with webbing is recommended to rotate
boom and tele sections. Chains are not recommended. If
a rollover fixture is not available, rotate tele sections using
adequate support with webbing.
A secure fixture that will prevent damage to the boom is
recommended to stabilize and hold the boom from moving
during removal of any section or sections.
CAUTION
Wear gloves when handling wire rope. Moderate to minor
injury may result if using bare hands.
DANGER
Ensure lifting device is capable of supporting the boom
assembly. Death or serious injury may result if the lifting
device cannot support the load.
DANGER
Ensure boom lift cylinder is properly supported before
disconnecting it from the boom. Death or serious injury
may result if lift cylinder is not supported.
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