TM 5-3815-224-14&P
1.
Raise the boom and move the machine up to the
cribbed up jib. Secure the jib to the boom point. See
Figure 3.
2.
Install the jib guy lines from the jib point to the
strut and from the strut to the jib backstay anchor. See
Figure 3 for information on the jib backstay anchor. The
jib suspension line should be adjusted so that the offset
angle of the jib to the boom, under load, does not exceed
the limitations shown on the rating plate. The maximum
jib offset angle is 300 as shown in Figure 1.
ERECTING THE CRANE BOOM. To erect the crane
attachment, proceed as follows:
NOTE
Consult the load rating chart for maximum boom
(or boom plus jib) that can be erected and
required conditions during erection.
1.
Check all reeving and inspect the complete
crane to be sure that everything is in order before
attempting
to
hoist
the
attachment.
Inspect
all
connections to be sure pins are locked. Since the boom
hoist lines are very heavily loaded while erecting a crane
boom, they must be in good condition.
2.
The boom must be raised from a horizontal
position. Support the boom in this position with the
blocking used during assembly.
3.
Erect the crane boom, being careful to take up
slack in the load lines as the boom goes up to prevent
any possibility of fouling lines.
LOWERING THE CRANE BOOM. To lower the crane
attachment, move the boom hoist lever forward and
slowly lower the boom onto blocking.
CAUTION
If machine is equipped with a fairlead, swing it
out of the way to fully lower the boom. See
FAIRLEAD and LAGGING Manual. (TM 5-3815-
223-14&P).
The load hoist lines must have adequate slack
when lowering the crane attachment to prevent
any possibility of these lines becoming taut.
These lines will tend to tighten as the attachment
is lowered, and if adequate slack is not allowed,
the attachment cannot be lowered completely.
Damage to the attachment may also result.
REEVING
JIB LOAD LINE REEVING. The reeving on the jib hoist
line depends on the load to be lifted and the speed at
which the load is to be lifted or lowered. Consult the
rating plate for a particular load. Typical reeving
diagrams recommended for the jib line is shown in Table
1. The drum is over-spooled when using the jib line. On
the 5060 crane the left drum is the jib load line. Table 1
gives rope size and length information.
INSTALLING ROPE ON DRUMS. The manner in which
a new or replacement wire rope is installed on the drums
will, to a large measure, determine the service life of that
rope. Improperly wound ropes will cause undue crushing
of the rope, doglegs, kinks, excessive abrasion and
cutting of the individual wires. Bad spooling also causes
uneven application of force and motion. This results in
fast fatiguing of the rope from the hook block, or
spreader, to the drum.
Figure 3. Attaching Jib
4
