PS Magazine - TB 43-PS-426
PS, The Preventative Maintenance Monthly
ISSUE 426
MAY 1988
The last thing you need is a crane
boom that won't take the Load
.
Bent Lattice or chord angLes or broken
weLds weaken the boom± It might fiL
under load±
EyebaLl your boom For any beNds in
the main angLes or LaciNgs± IF you see
any
bends-r broken weLds²don't
use the boom! Report it ASAP!
Bends
=
No Boom
Mechanics, you caN't repair a boom, but you caN look it over FOr broken we³Ds
and measure to see iF bends are bad enough to require boom repLacement±
T
Center
the straightedge
across the bend.
t
Measure the ga
p
between
the straighTedge and the lattice.
t
Multi
p
ly the length of the
straightedge by
0.025±
t
Com
p
are that amount with
the gap you just measured. If
the ga
p
is smaller than the
com
p
uted measurement,
the
bend is gradual and su
pp
ort can
0
try to cold straighten it.
²
Su
pport cannot straighten a
graduaL bend.
³
Any La±ing has more than a
gradual bend.
T
More thaN one tHird of the
lacings on oNe side have grad-
ual bends.
³
Any main angLe is bent.
´
Any weLd is brokEn²
T
³hree adjacent lacings
around the boom have gradual
beNds.
CrAµES ¶·¶
Weigh Load Ind±cator INfo
´tµs
OK
to o¶er·te your 20¸toN, 25¹ton and 140¸toN trUcKºmoUNteD
C»·¼es w½th a bUm we½gH Load in¾iC·tor, witH oNe exCeption:
¿y ÀDe»a³ rÁ³es, Cr·¼es ³iFt½¼g cargo
ÂetweeN ship a¼¾ sÃore are
¾e·D³½¼eD iF the we½gH
Lo·D iN¾½c·tor
Doesnµt
workÄ
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