5-20 Published 3-23-2020, Control # 654-04
SET-UP AND INSTALLATION GRT655/655L OPERATOR MANUAL
ERECTING AND STOWING THE BOOM
EXTENSION
Description
A 7.92 m to 13.7 m (26 ft to 45 ft) telescopic, manual
off-settable boom extension provides additional boom reach.
The boom extension weighs approximately 1678 kg
(3700 lb).
Throughout the following instructions the lattice section
portion of the boom extension is referred to as the boom
extension base section and the solid steel boxed section
portion is referred to as the boom extension fly section.
General Warnings
Securing the Boom Extension with a Tag
Line (Rope)
NOTE: A tag line attached to the tip of the boom extension
is used to control the movement of the boom
extension.
The boom extension may swing out on its own when you
remove the last connection that holds the boom extension at
the side of the main boom.
Always secure the boom extension before you begin the
erection procedure.
Secure the boom extension as follows:
• Attached a tag line (rope) at the front of the boom
extension.
• Have a helper hold the tag line (rope) tight while you
are removing the rear stowage attachment pin.
NOTE: If you are alone, secure the other end of the tag line
(rope) to the superstructure. Leave enough play in
the tag line that it is tight only when you swing the
boom extension towards the main boom nose later
in the procedure.
DANGER
Make sure the boom is fully retracted during erection and
stowage of the boom extension.
If the boom is extended during this process, the pins may
not engage properly and/or the boom extension could
move in an uncontrolled manner resulting in death or
serious injury.
DANGER
To prevent serious injury or death, always wear personal
protective equipment, including a hard hat, eye
protection, gloves and metatarsal boots.
Before attempting to erect or stow the boom extension,
read and strictly adhere to all danger decals installed on
the boom/boom nose, boom extension, and stowage
brackets to prevent serious injury or death.
Controlling the boom extension during erecting and
stowing procedures is accomplished by raising or
lowering the boom. Failure to control the boom extension
could cause serious injury or death.
DANGER
Always secure the boom extension with a tag line (rope)
on the main boom before removing any connections. This
will prevent the extension from swinging around
contacting personnel in the vicinity of the boom extension
or in the swing range.
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