TM 5-3810-206-35
CHAPTER 4
REVOLVING FRAME REPAIR INSTRUCTIONS
Section I. GANTRY AND SHEAVE YOKE
(6) Reassemble gantry sheave yoke by
4-1.
General
reversing procedure in steps (5) through (1) above.
The gantry is a framework consisting of a truss, front
c. Cleaning, Inspection, and Repair.
legs, braces, and rear tension members, mounted on
(1) Clean all parts and dry thoroughly.
rear of revolving frame and partially within cab. The
(2) Visually inspect spreader bar and yokes for
shaft and sheave, along with sheave yoke are installed
bends, cracks, or other defect. Check sheaves and
atop the cab rear canopy and attached to gantry by
bushings for wear or damage.
Check mounting
adapters.
hardware for burs, stripped threads, or other damage.
Check bearing blocks for scoring or other defect.
(3) Repair by straightening bends, welding
4-2.
Gantry Sheave Yoke and Adapters
cracks, or replacing damaged parts or defective
a. Removal or Installation.
mounting hardware.
(1) Remove gantry sheave yoke (TM 5-3810-
206-12).
4-3.
Gantry
(2) Remove two capscrews (20, fig. 4-1),
lockwashers (21), and keeper plate (22), then drive shaft
(19) from left and right adapters (25) and (28).
8 for instructions on removal or installation of gantry.
(3) Remove cotterpins (23), and pins (24) from
b. Disassembly or Reassembly.
adapters (25) and (28).
Remove four nuts (26),
(1) Remove setscrew (15, fig. 2-3) and sheave
lockwashers (27) and bolts (29), then lift adapters (25)
guard (16) from end of shaft (3).
and (28) from gantry.
(2) Remove bushing (17), sheave (18), and
(4) Install adapters and gantry sheave yoke by
washers (20) from shaft (3). Remove fitting (19) from
reversing procedure in steps (3) through (1) above.
sheave (18).
b. Disassembly or Reassembly.
(3) Remove 12 nuts (22), lockwashers (21), and
(1) Remove cotterpin (32) from bolt, special
bolts (7) which secure braces (5) and (6) to truss (4),
(33), and remove bolt and rope socket (8). Keep wedge
then remove braces from truss.
(9) with rope-socket.
(4) Remove two screws (29) and keeper plate
(2) Remove four screws (3) from two keeper
(28) from truss (4); remove shaft (3) and pipe spacers
plates (2) then remove spreader (1) from sheave yokes
(1) and (2) from truss (4), then remove front legs (23)
(31).
and (27) from truss.
(3) Remove two pins (11) from sheaves (14);
(5) Remove four cotterpins (8) from two pins
remove fittings (12) from pins (11), then remove two
(9), then remove two pins and two tension members (10)
sheaves (14) from yokes (31). Remove two bushings
from truss (4).
(13) from sheaves (14) only when replacement is
(6) Reassemble gantry by reversing procedure
required.
in steps (5) through (1) above.
(4) Remove eight nuts (30), lockwashers (21)
c. Cleaning, Inspection, and Repair.
and bolts (16) from four blocks (17), then remove yokes
(1) Clean all parts and dry thoroughly.
(31) and blocks (17).
(2) Visually inspect truss, braces, legs, or shaft
(5) Remove eight nuts (6), lockwashers (5), and
for bends, cracks, or other damage. Check sheave and
bolts (4), then remove gusset (7) from spreader bar (1).
guard for wear or other damage.
4-1
