Figure 4-23. Radius (boom angle) indicator, removal, disassembly, reassembly, and installation
drum shaft is free of remaining bearing; remove bearing
bearings, then remove pipes, seats, and springs.
from drum shaft, then remove drum and shaft from
(2) Remove two pipes and spacers from
frame.
upper bearing.
(3) Loosen setscrew securing drum to shaft
(3) Reassembly by reversing procedure in
and remove drum from shaft. Remove bearing retaining
steps (1) and (2) above.
ring, then remove remaining drum shaft bearing from
c. Cleaning, Inspection, and Repair.
frame. Drive pin from gear and shaft, then remove gear
(1) Clean all parts with an approved cleaning
from shaft.
solvent and dry thoroughly.
(4) Loosen setscrew and remove gear from
(2) Visually inspect parts for excessive wear,
pendulum shaft. Remove capscrew and shim from
bends, cracks, or other defect.
pendulum, then remove pendulum from shaft.
(3) Repair by straightening bends, welding
(5) Remove retainer from outer shaft bearing;
cracks, or replacement of all parts damaged beyond
drive bearing inward until free of frame; remove
repair.
bearings from pendulum shaft, then remove shaft.
Note. Do not remove rivets from plate on
4-23. Radius Indicator (Boom Angle Indicator)
drum unless plate is to be replaced.
(6) Reassemble by reversing procedure in
mounting capscrews and lockwashers, then remove
steps (1) through (5) above.
radius indicator from crane boom.
b. Disassembly and Reassembly.
Note. At reassembly, assure that pendulum
(1) Remove eight screws (fig. 4-23),
and drum move freely without bind. Test by
flatwashers, and two plates to expose bearings and
moving frame back and forth through drum
shafts. Remove four capscrews and washer, then
measurement are.
remove end plate.
(2) Remove retaining rings from ends of
c. Cleaning, Inspection, and Repair.
drum shaft; move pendulum aside, move drum shaft
against bearing and press bearing out of frame until
4-21
