BOOM DISASSEMBLY SAFETY CONSIDERATIONS
Folio 1474-2
DISASSEMBLY PROCEDURES
Always block boom sections on both sides of connections so
that sections are securely supported and cannot shift or
move suddenly when pins are removed. If there is any doubt
about a boom disassembly procedure, block tightly under the
boom before removing any pin.
Lower boom onto blocking on the ground.
Block boom
sections on both sides of each connection.
If boom to be disassembled is not cantilevered, pay out
boom hoist line so that line is slack. As long as all boom
sections are securely blocked, top and bottom connecting
pins can be safely removed. Boom can collapse, however, if
a section is not blocked and pins are removed (
Figure 2).
If a cantilevered boom is disassembled, boom sections
ahead of boom hoist connection must be blocked before
removing pins. Boom will collapse if upper pins are removed
and boom sections are not blocked (
Figure 3). Boom will also
collapse if lower pins behind boom hoist connection are
removed and sections are not blocked (
Figure 2).
DANGER
Collapsing Boom Hazard!
Boom can collapse or jerk when pins are removed. To
avoid death or serious injury:
• Never remove any pin until the boom is lowered and
securely blocked.
• Never work or stand under or inside boom.
• Do not stand or walk on top of boom.
• Remove pins from outside of boom.
DANGER
Tipping Hazard!
Crane can tip if excess boom is cantilevered. Never
cantilever more boom than allowed on rigging drawings
and capacity charts.
Boom Top
Removed
Blocking
RIGHT
No Blocking
WRONG
Boom collapses when
lower pin is removed.
FIGURE 2
A718
Cantilevered
Boom Section
Boom collapses when
upper pin is removed.
Blocking
RIGHT
No Blocking
WRONG
No Blocking
WRONG
FIGURE 3
A718
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