f. Remove brake shoe brackets (19) and (18)
firmly against retainer (36). Install spacer (39) on the
shaft above bearing (35).
Remove nuts (20), lock washers (21), bushings (22) and
c. Assemble screws (23), spring bolt (15), nut (20),
screws (23). Brake linings (24) can now be removed.
g. Remove shims (25), (26) and (27) and washer
lock washer (21) and bushing (22) into brake shoe
bracket (19). Assemble the identical items into brake
(28). Remove male elbow (29), tube assembly (30),
shoe bracket (18).
bracket (31) and grease fitting (32).
d. Install piston (44), retainer (45), spring (46),
h. Remove brake sheave (33) and press shaft (34)
cylinder (47) and bleeder fitting (48) on shoe bracket (19)
out of the bottom of the revolving frame. Bearing (35),
and secure into position with screws (43).
retainer (36) and packing (37) come off with the shaft.
e. Install release rod (17) with nuts (16) in place
i. Remove bearing (38) and spacer (39) through
into bracket (18). Bracket (18) is tapped to receive the
the top of the bore in the revolving frame.
threaded end of the rod.
f. Insert bolt (15) into bracket (18) and secure with
nuts (14). Place brake shoe bracket (19) over the op-
Do not remove or change the adjustment of
posite end of bolt (15).
adjusting bolts (40), jam nuts (41) or brackets
g. Install spring seat (12), spring (11), spring
(42) unless one of these items must be replaced.
seat(10) and nuts (9).
These parts are used to maintain the brake
h. Install the preassembled shaft (34) into the bore
of the revolving cylinder from beneath the frame. In-stall
bearing (38) from above the frame.
j. Remove screws (43). The hydraulic cylinder
i. Install sheave (33) and secure the sheave in
(items 44 through 48) will then come off as an assembly.
place with retainer (5), spacers (4), shield (3), washers
However, it is not recommended that these items be
(2) and screws (1).
disassembled or disturbed unless replacement of parts is
j. Place the two assembled brake shoe brackets
(18) and (19) on sheave (33). Install washers (28) and
shims (25), (26) and (27), and secure these with pins
5-51. Cleaning, Inspection and Repair
(13). In-stall screws (6), lock washers (7) and eye-bolts
a. Clean all metal parts in cleaning solvent, Federal
Specification P-D-680, or equivalent, before inspect-ing.
k. Install male elbow (29), tube assembly (30),
b. Replace all seals, gaskets, deformed shims,
bracket (31), and grease fitting (32).
pack-ings, and other expendable parts.
c. Inspect all parts for wear, scoring, cracks, or any
other signs of damage or excessive wear. Replace any
a. Using an overhead crane or other suitable lifting
parts not in good condition. Inspect gear teeth for severe
device, attach lifting sling to the boom foot lugs on the
wear, pitting and cracks, especially at the roots of the
revolving frame, and to the gantry peak pin. Install the
revolving frame on the carrier, keeping the revolving
d. Inspect and smooth all seal seating surfaces
frame stable in the lifting sling until the hook rollers are
with a fine oil stone or crocus cloth.
b. Refer to TM 5-3810-295-12, and perform the
a. Refer to figure 5-12 and install packing (37) in
(1) Install hook rollers.
retainer (36). Place the assembled items on shaft (34)
(2) Adjust swing brake.
with the O-ring down.
(3) Bleed hydraulic lines.
b. Install bearing (35) on the shaft, with the bearing
(4) Lubricate swing brake shaft
REPAIR OF VERTICAL SWING SHAFT
a. Refer to TM 5-3810-295-12 and perform the
The vertical swing shaft is driven from the horizontal
swing shaft. The shaft terminates in a pinion which
mates with the gear in the slewing ring, as shown in
(1) Remove the boom assembly.
(2) Remove hook rollers.
(3) Drain main upper gear case oil.
(4) Remove one horizontal swing shaft
(left or right).
The vertical swing shaft cannot be moved as a major
assembly, but must be disassembled in place.