Figure 3-22. Hook block.
to determine whether the cable is suitable for further use.
The recommended method is to determine the degree of
damage at the worst rope lay. By definition, a rope lay is
the distance along the rope in which one strand makes
one complete turn around the rope. Any of the following
conditions should cause the operator to replace the
cable or to give consideration to replacing the cable.
Figure 3-21. Cable roller and boom point sheave
(1) If the core shows through more than one pair
3-29. Backhoe Attachment
(2) If kinking is damage is severe.
a. Service. Installation and reeving of the backhoe
(3) If there is evidence of improper lubrication
combined with other defects.
backhoe attachment lubricated in accordance with the
lubrication order. When the attachment is not in use, it
(4) If the cable has come into contact with an
should be placed on -wooden blocks, if possible, and
electrical circuit or has been overheated in some other
should be cleaned, using a cleaning solution.
machined or finished surfaces must be kept lubricated as
required to prevent rust.
(5) If there is a serious reduction in rope size.
b. Dipper Tooth Replacement. Dipper teeth must
(6) If there is evidence of "bird-caging". This
be replaced when they are worn to about one third their
condition of suddenly increased size is usually caused by
original length. Refer to figure 3-25 and replace dipper
the sudden release of a heavy load while the cable is
3-30. Piledriver Attachment
(7) Broken wires at the dead end (tied down end)
of a cable are cause for cutting off a section. Cut at least
a. Service. Keep the piledriver attachment clean
three feet beyond the broken wires. Then refasten or re-
and lubricate in accordance with the lubrication order.
socket the rope.
(8) If there are numerous broken wires, or as
replace the piledriver attachment.
many as three adjacent broken wires in one rope lay.
(9) If corrosion or rust damage is apparent.
3-31. Cables, Inspection, Service, and Adjustment
b. Service. Normal service for cables is to keep
a. Inspection. Inspect all cables used for boom or
them clean, using a wire brush, scraper, or com-
load handling daily.
The inspection is intended