JLG 660AJ Service Manual - Manual (Page 153)

SECTION 4 - BOOM & PLATFORM
3121616 – JLG Lift – 4-5
Remove Tower Boom
1. Tag and disconnect all hydraulic lines from tower boom
assembly to turntable components. Use suitable con-
tainer to retain any residual hydraulic fluid. Cap hydrau-
lic lines and ports.
2. Disconnect wiring harness from ground control box.
3. Support tower boom assembly at approximate center of
gravity with suitable lifting device.
4. Remove mounting hardware from lower lift cylinder rod
end. Using a suitable brass drift and hammer, remove
pin #1 from tower boom assembly.
5. Remove mounting hardware from tower boom pivot
pin. Using a suitable brass drift and hammer, remove pin
#2 from turntable assembly.
6. Remove tower boom assembly from turntable upright.
Place tower boom assembly on well supported trestles.
Figure 4-4. Tower Boom Components
DISASSEMBLY
1. Remove brackets securing hoses and wiring harnesses
to push tubes and top of tower boom assembly.
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 push tubes
to the powertrack. Remove push tubes.
5. Remove mounting hardware and powertrack from top
of tower base section.
6. Remove mounting hardware from tower boom tele-
scope cylinder barrel end.
7. Remove mounting hardware and wear pads from top,
sides, and bottom of tower base boom front section.
8. Remove fly assembly from base section using an over-
head crane or suitable lifting device.
9. Remove mounting hardware which secures tower tele-
scope cylinder to fly section. Remove pin from fly boom
section using a suitable brass drift and hammer.
10. Remove mounting hardware which secures 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 upright lev-
eling cylinder to fly section. Remove pin from fly boom
section using a suitable brass drift and hammer.
12. Remove hardware and wear pads from top, sides, and
bottom of fly boom aft section.
Figure 4-5. Tower Boom Powertrack Components
1
2
Cover Plate
Hose Clamp
Hose & Cable
Bracket
Push Tubes