SECTION IV
MACHINE RIGGING
Figure 4-2. Boom Backstop Installation (2100N509)
rope, doglegs, kinks, excessive abrasion and cutting of the
REEVING
individual wires. Bad spooling also causes uneven applica-
tion of force and motion. This results in fast fatiguing of the
BOOM HOIST REEVING. The reeving of the boom hoist line
rope from the hook block, or spreader. to the drum.
is shown in Figure 4-3. Before reeving the boom hoist drum
lines, spool out the rope so as to prevent any possibility of
kinking during the reeving process. The rope is over-
spooled onto the boom hoist drum.
The maximum amount of rope that can be
LOAD LINE REEVING. The reeving on the main hoist line
stored on each main load drum when the ma-
depends on the load to be lifted and the speed at which the
chine is equipped as a liftcrane is 710 feet.
load is to be lifted or lowered. Consult the rating plate for
reeving required for a particular load. Typical reeving dia-
grams recommended for the main hoist lines are shown in
The following five precautionary steps should be taken, par-
Figure 4-4. With all attachments, both drums are over-
ticularly with a replacement wire rope, before starting the
spooled as shown in the drum to the boom point section of
actual installation of the rope.
1. A check should be made of the drum to determine the
Table 4-1 gives the rope size and length for the drums.
condition, size and shape of the drum grooves, if so equip-
ped.
INSTALLING ROPE ON DRUMS. The manner in which a
new or replacement wire rope is installed on the drums will,
2. Drum flanges should be checked to determine the ex-
to a large measure, determine the service life of that rope.
tent, if any, of undercutting at the base of the flange.
Improperly wound ropes will cause undue crushing of the
