5-20 Published 3-22-2021, Control # 702-02
SET-UP AND INSTALLATION GRT8120 OPERATOR MANUAL
BOOM EXTENSION
Fully read and understand the information under this section
before erecting and stowing the boom extension.
Refer to (Figure 5-25) for a diagram of the boom extensions
available for this crane.
The GRT8120 can be used with the following boom
extensions:
• 10.5 m to 17.6 m (34.5 ft to 57.6 ft) manual offsettable
bi-fold swingaway boom extension (folding manual
luffing extension), with mechanical offset mechanism for
offsets of 0, 20, and 45 degrees
• 10.5 m to 17.6 m (34.5 ft to 57.6 ft) hydraulic offsettable
bi-fold swingaway boom extension (folding hydraulic
luffing extension), with hydraulic offset mechanism for
offsets of 0 to 45 degrees
All boom extensions are built specifically for the crane with
which they were sold. Each extension is stamped with the
crane’s serial number.
To use a single boom extension on several Grove cranes,
contact Manitowoc Crane Care or your authorized Grove
Distributor.
DANGER
To prevent serious injury or death, always wear personal
protective equipment; i.e., a hard hat, eye protection,
gloves and metatarsal boots.
CAUTION
Equipment Damage Hazard!
Operate the crane only with extensions which have the
same serial number as the crane, to prevent malfunctions
and damage to the equipment.
FIGURE 5-25
Boom Extension Base Section
Fly Section Stowed on Main
Boom
Fly Section
7.1 m (23.1 ft)
Boom Extension Base Section
10.5 m (34.5 ft)
Boom Extension Base Section
10.5 m (34.5 ft)
Boom Extension Base Section
Fly Section Deployed
17.6 m (57.6 ft)
10089-1 and 10089-2
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