TM 5-3810-289-12
Boom suspension .............................5/8" x 75'
Hoist ...........................................5/8" x 100'
Drag ............................................3/4" x 65'
Shovel.
Boom suspension .......................1/2" x 241''
Hoist ...........................................5/8" x 100'
Backhaul .....................................3/4" x 26' 6"
Crowd .........................................3/4" x 51' 6"
Dipper trip ...................................5/16" x 35'
Note. When adding boom sections, add cable
accordingly.
4-56.
Boom Assembly
a. Inspection.
(1) Lower the boom and support on
cribbing (fig. 3-14). Spool off a few turns of the
suspension and hoist ropes so that the boom point
sheaves can be rotated by hand.
(2) Examine all the sheaves for side wear
of the rope grooves.
(3) Inspect block and hook for secure
mountings and proper lubrication.
(4) Inspect crane boom for bent or
damaged cords and lacings and for secure bolt
mountings of butt joints. Tighten all attaching bolts and
replace any that may be missing. Inspect the boom foot
Figure 4-40. Reeving crane hoist cable.
pins to see that they are secure.
b. Service. Lubricate all points on the boom
Table 4-2. Primary Hoist Cable Lengths
lubrication order.
c. Removal.
Boom length Cable lengths (4-part)
(1) Remove crane hook by removing the
80
250
hoist rope (para 4-55).
40
300
(2) Build up cribbing about four feet high,
50
350
which will support the boom foot and boom point at
60
400
approximately the height at which it is attached to the
revolving frame (fig. 4-32). Propel machine up to the
Note. Add a 10' pendant for each additional section.
cribbing and lower boom on cribbing. Remove boom
suspension rope (para 4-54).
Table 4-.3 Cable Specifications and Lengths
(3) Remove lagging from front drum by
Cable
taking out the six attaching bolts, nuts and lock-washers.
Crane (30 ft).
Dia. Length
(4) Drive wedges under boom foot as may
be necessary to relieve boom foot pins of boom weight.
Remove boom foot pin locking screws and take out the
Boom suspension ...................... " x 241''
pins. Back machine away from boom and put pins back
Primary and secondary hoist ..... 5/8" x 250'
into revolving frame for use on front end which is to be
Dragline.
installed.
Boom suspension ...................... Same as crane
d. Installation. To install, follow the removal
Hoist ........................................... 5/8" x 130'
procedure in reverse.
Drag ........................................... 3/4" x 170'
e. Extra Ten-Foot Sections.
Clamshell.
Boom suspension ...................... Same as crane
(1) Build up cribbing to support crane
Holding ....................................... 5/8" x 140'
boom upper section. Lower boom until it rests on the
Closing ....................................... 5/8" x 170'
cribbing.
Backhoe.
4-55
