b. Counterweight Installation.
Caution: Proceed slowly and carefully when
removing or installing the counterweight, since severe
damage can be caused by improper handling.
(1) Install two eyebolts and a suitable lifting sling in
the tapped holes provided in the top of the, the
counterweight, and lift the counterweight into position on the
two locating pins on the deck of the carrier. The locations of
the pins are shown in figure 2-6. Use the crane boom and
(2) Remove the eyebolts and stow them in the tool
(3) Swing the revolving frame so that the rear of the
revolving frame is positioned over the counterweight, and
the two holes in the rear of the revolving frame are directly
Figure 2-4. Extending outriggers.
above the two tapped holes in the counterweight.
lieve pressure on the jackfloats on the right side of the
(4) Insert the two long bolts through the guide tubes
carrier. Turn down the jackscrews on the right side of
in the revolving frame, with spacers and plain washers
the carrier until the jackfloats on the right side are
located as shown in figure 2-6, and raise the counterweight
firmly supporting the machine.
into position gradually by tightening the bolts evenly.
Swing the upper so that the
counter- weight is over the right side of the carrier, to
(5) Bolt the keeper plates into position as shown in
relieve pressure on the jackfloats on the left side of
the carrier. Turn down the jackscrews on the left side
of the carrier until the jackfloats on the left side are
firmly supporting the machine.
(3) Outrigger positioning and operation. Put
outrigger down just far enough to take strain off the
a. Generals. The truck crane may be converted to
tires and machine is level within one degree.
crane operation by installing the crane front- end assembly.
The following components are necessary for the equipment
and retract the outriggers.
conversion; one 15- foot boom base section, one 15-foot
point section, boom foot pins, boom guy cables, boom hoist
cable, boom backstops, hoist line, and hook block. The
a. General. The basic truck crane can be
basic crane boom may be extended by installing boom
converted to various uses by changing front-end
inserts between the boom base section and the boom point
attachments. The converted truck crane may be
section. The boom inserts are in 10-foot lengths, and must
referred to as a crane, clamshell, dragline, pile- driver,
be for the specific boom installed so that the connecting
backhoe, or shovel. The various conver- sions are
joints of the boom and insert match. Longer guy cables are
necessary when the length of the boom is increased; refer
conversion is anticipated, make certain that all
required attachments, tools, block- ing, personnel,
b. Boom Installation.
and a suitable lifting device are available.
Note. To install the boom, a cribbing will be
Note. Before reeving any line, lay out the line
necessary to support the boom in a horizontal position. The
so that there is no possibility of kinking during the
cribbing must be high enough to bring the boom into
position with the boom foot lugs on the revolving frame, as
information on the handling and maintenance of wire
rope. When wrapping new cable on a drum, wrap the
cable slowly and make certain that the cable wraps
evenly on the drum the first time.