ging is installed on digging drum (para 3-124) then
4-27. Backhoe Auxiliary Gantry
proceed as follows:
(1) Move crane-shovel unit into position at
a. Removal.
cribbed backhoe attachment as shown in figure 2-15.
(1) Lower boom (para 2-12b) to rest on
(2) Use wedges or jacks to raise boom from
cribbing (fig.2-15b).
cribbing so that adapters line up with revolving frame
(2) Disconnect boom hoist, hoist, and digging
foot lugs, install pins that secure boom foot adapters to
cables at dead end sockets (fig. 2-16) then wind on
revolving frame and secure pins with cotter pins (fig. 4-
drums (unreeve).
24).
(3) Remove backstop (para 4-30).
(3) Lift auxiliary gantry from boom, lean it
(4) Remove four cotterpins (fig 4-25) from
toward crane-shovel, then attach backstop to revolving
two pins securing gantry to left and right hand boom foot
frame gantry pin (para 4-30).
adapters, remove pins, then remove auxiliary gantry.
(4) Remove blocking that is between auxiliary
b. Disassembly and Reassembly.
gantry and boom (fig. 2-15); install backhoe cables
(1) Refer to figure 4-26, remove items 1
shown in table 1-2 as described in paragraph 3-29, and
through 9 is numerical sequence, then remove sheave
reeve (fig. 2-16).
frames from gantry.
(5) Adjust boom hoist cable on drum until
(2) Refer to figure 4-25 to remove adapters
auxiliary gantry is vertical; use hoist cable to raise boom
and wire rope socket from gantry frame.
and remove cribbing at point and foot of boom, then
(3) Complete disassembly, numerically, as
release digging cable and allow bucket to drop so
shown on figure 4-26.
blocking can be removed from between brace and boom
(4) Reassemble in reverse order.
(6) Perform preventive maintenance checks
and services (para 3-6).
c. Installation. Install the auxiliary gantry by
reversing procedure in steps (4) through (1) in a above.
Figure 4-25. Auxiliary gantry and boom foot adapters.
4-24
