SECTION 4 – BOOM
3120933 Rev. 0 USTC 4-1
GENERAL
This manual covers the 94 ft. boom which is mounted
on 2500JBT and 2700JBT cranes. The boom consists
of four sections, a telescope cylinder inside of the
boom and the hoist. For the purposes of this manual
the lift cylinder is also to be considered part of the
boom.
The boom must be maintained properly to provide
long life and proper operation. Wear pads are con-
sumable items which must be adjusted through shims
or replaced when necessary. Cables inside the boom
will stretch and require adjustment.
The wire rope or hoist cable must be wrapped prop-
erly on the hoist.
CABLE INSPECTION PROCEDURES
All cables must be inspected on a daily basis. In
addition to the daily inspection a qualified person
should do a complete and thorough inspection annu-
ally or every 2000 hours, whichever occurs first.
CAUTION: WEAR GLOVES TO PROTECT
HANDS WHEN HANDLING CABLE.
The periodic inspection shall cover the entire length
of cable. The inspection frequency shall be based on
such factors as expected cable life as determined by
experience with similar installations, severity of
environment, percentage of capacity lifts, frequency
rates of operation, and exposure to shock loads.
Inspection should be more frequent as cables ap-
proach the end of their useful lives.
Only the surface wires of the cable require inspec-
tion. Do not attempt to open the cable. Any deteriora-
tion resulting in an appreciable loss of original
strength, such as described below, shall be noted, and
then a determination made if further use would con-
stitute a hazard.
No precise rules can be given for determination of the
exact time for replacement of the cables. This de-
pends largely on good judgment by a qualified person
evaluating the cable.
Figure 4-1. Wire Rope Components
Courtesy of Crane.Market
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