JLG 660SJ Service Manual - Manual (Page 119)

SECTION 4 - BOOM & PLATFORM
3120840 – JLG Lift – 4-17
c. Using suitable lifting device, support the tower
boom assembly at it’s approximate center of
gravity.
d. Remove mounting hardware from lower lift cylin-
der rod end. Using a suitable brass drift and
hammer, remove pin #1 from the tower boom
assembly.
e. Remove mounting hardware from tower boom
pivot pin. Using a suitable brass drift and ham-
mer, remove pin #2 from the turntable assembly.
f. Remove tower boom assembly from turntable
upright. Place tower boom assembly on a well
supported trestles.
Disassembly
1. Remove brackets securing hoses and wiring har-
nesses to push tubes and top of tower boom assem-
bly.
2. Mark all hoses and wiring harnesses at bracket on
aft end of tower base boom section for future
assembly. Remove hoses and wiring harness from
tower boom powertrack.
3. Remove mounting hardware which secures the
push tubes to the tower fly boom section.
4. Remove mounting hardware which secures the
push tubes to the powertrack, then remove push
tubes.
5. Remove mounting hardware which secures the
powertrack to the top of the tower base section, then
remove powertrack.
6. Remove mounting hardware from tower boom tele-
scope cylinder barrel end.
7. Remove mounting hardware which secures the wear
pads to front of tower base boom section; remove
the wear pads from the top, sides and bottom of the
tower base boom.
8. Using an overhead crane or suitable lifting device,
remove fly assembly from base section.
9. Remove mounting hardware which secures the
tower telescope cylinder to the fly section. Using a
suitable brass drift and hammer, remove the pin
from the fly boom section.
10. Remove mounting hardware which secures the wear
pads to aft end of tower fly boom section; remove
the wear pads from the top, sides and bottom of the
fly boom.
11. Remove mounting hardware which secures the
upright leveling cylinder to the fly section. Using a
suitable brass drift and hammer, remove the pin
from the fly boom section.
12. Remove hardware which secures the wear pads to
the aft end of fly tower boom section; remove the
wear pads from the top, sides and bottom of the fly
boom section.
Figure 4-21. Location of Components - Tower Boom
Figure 4-22. Location of Components - Tower Boom
Powertrack