TM 5-3810-288-12
Figure 2-10. Boom backstop installation. (Sheet 2 of 2)
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Main Hoist Line Reeving.
Figure 2-9. Installing boom foot pins.
(1)
Main hoist line reeving is shown in figure 2-15.
The number of parts of line (from one to five) used on the main
hoist line depends on the weight of the loads to be lifted and
the line speed desired. For maximum speed of operation, use
no more parts of line than are required for the loads to be
lifted, within the limitations shown on the rating plate in the
machine upper cab.
(2) Reeve the main hoist line on the rear main drum,
and reeve the secondary hoist line (if used) on the front main
drum. If a jib is used, reeve the jib line on the rear main drum,
and the main hoist line on the front main drum. Secure the
hoist lines to the drums as shown in figure 2-14.
(3) A single-part line is reeved over the center boom
point sheave, directly to a weighted hook, and is deadended at
the hook. A weighted hook must be used for single line
operation, instead of a hook block.
(4) A two-part line is reeved over the center boom
point sheave, around one hook block sheave, and deadended
at the boom point.
Figure 2-10. Boom backstop installation (Sheet 1 of 2)
(5) A three-part line is reeved over the left boom
point sheave, around a hook block sheave,
lower right gantry spreader sheave, around the upper
right upper spreader sheave, around the upper right
gantry spreader sheave, around the lower right upper
spreader sheave, around the right gantry peak pin
sheave, and down to the boom hoist drum.
(6) Secure the boom hoist line to the boom
hoist drum as shown in figure 2-14, and spool the
slack cable on the drum.
2-7
