TM 5-3810-289-12
(2) Remove dipper handle and dipper
4-73.
Shovel Boom
assembly (para 4-71).
a. General. The shovel boom is attached at
(3) Remove saddle block and shipper
the base to the superstructure turntable. It supports the
shaft (para 4-72).
dipper and handle assemblies. The outer end
c. Cleaning, Inspection and Repair. Clean
of the boom is supported by the boom hoist cables. The
and inspect parts for wear and damage. Replace worn
shovel boom consists of the boom weldment, cable
or damaged parts.
sheaves, guards, bushings, and shafts.
d. Installation.
Installation procedure is
b. Removal.
reverse of removal, b, above. Refer to paragraph 2-8 for
(1) Remove boom assembly, dipper, and
adjustments.
handle (para 4-69a).
Section XVIII. MAINTENANCE OF BACKHOE FRONT END EQUIPMENT
The dipper is attached to the handle and pitch brace
4-74.
General
assembly. It is actuated by the pull cables through the
a. This section contains instructions for
padlock sheave assembly.
replacing the backhoe front end equipment and for
b. Removal.
maintenance of components. For front end conversion
(1) Lower dipper to rest on blocks, then
to a backhoe, refer to paragraph 2-7.
remove drag cable from padlock sheave.
b. Refer to paragraph 1-4e for description the
(2) Remove cotter pins and washers from
backhoe front end equipment.
handle and pitch brace pins. Remove handle and pitch
c. Use a crane or other adequate lifting device
brace pins, and remove dipper and padlock from handle.
for removing and installing components.
c. Disassembly. Refer to figure 4-59 and
disassemble dipper.
4-75.
Replacement of Backhoe Front End
d. Cleaning, Inspection and Repair.
Equipment
(1) Clean and inspect parts and attaching
a. Removal.
hardware for damage and wear.
(1) Lower boom on support cribbing (fig 2-
(2) Inspect teeth and side cutters for wear
and damage.
(2) Remove backhoe dipper and boom
(3) Inspect padlock assembly for worn or
suspension cables (fig. 2-16).
damaged links, broken pins, and missing parts. Inspect
(3) Remove boom foot locking bolts and
sheave and bushing for wear and damage.
pins.
(4) Repair or replace damaged, worn, or
(4) Propel machine slowly backward until
missing parts.
boom foot is separated from lugs on revolving frame.
e. Reassembly. Refer to figure 4-59 and
b. Cleaning, Inspection and Repair.
reassemble dipper.
(1) Clean and inspect boom assembly,
f.
Installation.
Installation procedure is
dipper, and handle, for damaged or missing parts.
reverse of removal, b, above.
Lubricate in accordance with current lubrication order.
(2) Repair or replace damaged or
4-77.
Backhoe Handle and Back Brace
defective components.
a. Removal.
c. Installation.
Installation procedure is
(1) Lower dipper to rest on blocks. Build
reverse of removal, a, above.
cribbing under boom (fig. 2-15).
(2) Remove deflector and hoist cables (fig.
4-76.
Backhoe Dipper and Padlock
a. General. The dipper assembly consists of
(3) Attach lifting sling to handle with ends
the dipper, dipper teeth, side cutters, attaching pins and
of sling attached near each end of handle. Attach sling
bushings, and the padlock sheave assembly.
to lifting device.
4-79
