Manitowoc 999 User Manual

Reference Only
SAFETY INFORMATION 999 LUFFING JIB OPERATOR MANUAL
2-22
Published 05-15-17, Control # 043-09
Disassembly Precaution — #22E/22EL Boom
See Figure 2-5 in the following procedure.
Always block boom sections so they 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 boom sections 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.
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. Boom will also collapse
if lower pins behind boom hoist connection are removed and
sections are not blocked.
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.
A718
Cantilevered
Boom Section
Boom collapses when
upper pin is removed.
Blocking
RIGHT
No Blocking
WRONG
No Blocking
WRONG
FIGURE 2-5
Typical Crane Shown!
Typical Crane Shown!

Manitowoc 999 Specifications

General

Brand	Manitowoc
Model	999
Category	Construction Equipment
Language	English