tension members. Remove the intermediate tension mem-
ber lock pins from the intermediate tension members. This
Consult the load rating chart for the required insert
will allow the upper and intermediate members to fold to-
wards the machinery house. See the topic, Gantry, earlier
in this section.
2. When the required insert is laid out, lower the basic
boom. Provide a minimum of 6 inches of blocking under the
6. Pay out on the boom hoist line to lower the gantry. Set
base and tip section (see Figure 4-9, View A). Pin the upper
the gantry in position for attaching the slings.
spreader to the boom base and remove the guy lines con-
necting the tip section to the upper spreader. Engage the
7. Adjust the turnbuckles to give a dimension of 53-7/16
boom hoist to remove all slack in the hoist lines.
3. Remove the bottom connecting pins of the boom base
8. Pin the turnbuckles to hole "A" in the gantry peak lug.
and tip section.
Do not stand under the boom or inside the
boom structure when removing pins. The boom
could fall if improperly supported and could
cause serious injury.
4. Allow the attachment to hinge about the top connecting
pins and lower the base and tip until they rest on the
blocking. Remove the top connecting pins (see Figure 4-9,
9. Pin the sling to the turnbuckle.
5. Engage the boom hoist and slowly raise the base (insert)
off of the blocking. Reposition the machine behind the next
When positioning the counterweight be car-
insert to be added and align the top connectors. Insert the
tain each is resting evenly and firmly on its
top connecting pins.
6. Engage the boom hoist and raise the attachment until
10. Attach the sling hooks to the counterweight and lift the
the bottom connecting pins can be inserted.
counterweight into position by engaging the boom hoist
7. Lower the attachment and provide blocking under the
lever to take in line.
end of the insert. Install the guy lines from the end of the
11. Fasten counterweight #1 to the gantry lower tension
insert to the spreader (see Figure 4-9, View C). Unpin the
member using the 9-1/2 inch bolts. Place the attaching
upper spreader from the boom base.
hardware, lubricated with an anti-seize compound, through
8. Continue adding tlp section, as explained in steps 5 and 6.
the top holes and torque to 475 ft-lbs.
Clamshell and dragline operation requires only one
counterweight. Refer to the load rating chart for Iift-
Consult the load rating chart regarding the
crane operation with one counterweight.
boom lengths which require intermediate sus-
9. See jib and insert manual to add more sections to the
GENERAL. The following paragraphs describe procedures
ERECTING THE CRANE BOOM. To erect the crane attach-
for: increasing boom length, and erecting and lowering the
ment, proceed as follows
boom. As was stated at the beginning of this section the
procedures given are for attaching items, whenever possi-
ble, without the use of an assisting machine. If an assisting
crane is required it IS noted that it is required. It IS important
Consult the load rating chart for maximum boom (or
that the first part of this section, Basic Rigging, is read
boom plus jib) that can be erected and required con-
before proceeding further.
ditions during erection.
INCREASING BOOM LENGTH. To increase boom length
1. Check all reeving and Inspect the complete crane to be
beyond the basic boom (base plus tip), proceed as follows.
sure that everything is in order before attempting to hoist
the attachment inspect all connections to be sure pins are
1. Using the basic boom, arrange the required insert, on
locked. Since the boom hoist lines are very heavily loaded
blocking in a line. Consult the load rating chart for the boom
while erecting a crane boom, they must be in good condi-
and guy line arrangement at the particular length of boom
required. Do not pin the inserts together at this time.