JLG 660SJ ANSI Service Manual - Manual (Page 156)

SECTION 4 - BOOM & PLATFORM
4-20 – JLG Lift – 3120718
Installation
1. Using a suitable lifting device, position tower boom
assembly on turntable so that the pivot holes in both
boom and turntable are aligned.
2. Install tower boom pivot pin, ensuring that location
of hole in pin is aligned with attach point on turnta-
ble.
3. If necessary, gently tap pin into position with soft
headed mallet. Secure pin mounting hardware.
4. Using all applicable safety precautions, operate lift-
ing device in order to position lower boom lift cylin-
der so that holes in the cylinder rod end and tower
boom structure are aligned. Insert the lift cylinder
pin, ensuring that location of hole in pin is aligned
with attach point on tower boom.
5. Connect all wiring connections at ground controls.
6. Connect all hydraulic lines running from aft end of
tower boom assembly to ground controls.
7. Using suitable lifting device, position upright on
tower boom assembly so that the pivot holes in both
upright and tower boom are aligned.
8. Using all applicable safety precautions, operate lift-
ing device in order to position upright leveling cylin-
der so that holes in the cylinder barrel end and
upright structure are aligned. Insert the level cylinder
pin, ensuring that location of hole in pin is aligned
with attach point on upright.
9. Align upper lift cylinder with attach holes in upright.
Using a soft head mallet, install the cylinder pin
upright and secure with mounting hardware.
10. Align master cylinder with attach holes in upright.
Using a soft head mallet, install the cylinder pin
upright and secure with mounting hardware.
4.7 ARTICULATING JIB BOOM
Removal
1. For platform/support removal see platform/support
removal diagram. See Section 4.4, Boom Mainte-
nance (S Models).
2. Position the articulating jib boom level with ground.
3. Remove mounting hardware from slave leveling cyl-
inder pin #1. Using a suitable brass drift and ham-
mer, remove the cylinder pin from articulating jib
boom.
4. Remove mounting hardware from articulating jib
boom pivot pin #2. Using a suitable brass drift and
hammer, remove the pivot pin from boom assembly.
Disassembly
1. Remove mounting hardware from articulating jib
boom pivot pins #3 and #4. Using a suitable brass
drift and hammer, remove the pins from articulating
jib boom pivot weldment.
2. Remove mounting hardware from rotator support
pins #5 and #6. Using a suitable brass drift and
hammer, remove the pins from rotator support.
3. Remove mounting hardware from lift cylinder pin
#7. Using a suitable brass drift and hammer, remove
the cylinder pin from articulating jib boom.
Figure 4-21. Location of Components - Articulating
Jib Boom