JLG 660SJ Service Manual - Manual (Page 121)

SECTION 4 - BOOM & PLATFORM
3120840 – JLG Lift – 4-19
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.
Inspection
NOTE: Refer to Section 2 - General.
1. Inspect articulating fly boom pivot pin for wear, scor-
ing, tapering and ovality, or other damage. Replace
pins as necessary.
2. Inspect articulating fly boom pivot attach points for
scoring, tapering and ovality, or other damage.
Replace pins as necessary.
3. Inspect inner diameter of articulating fly boom pivot
bearings for scoring, distortion, wear, or other dam-
age. Replace bearings as necessary.
4. Inspect lift cylinder attach pin for wear, scoring,
tapering and ovality, or other damage. Ensure pin
surfaces are protected prior to installation. Replace
pins as necessary.
5. Inspect inner diameter of rotator attach point bear-
ings for scoring, distortion, wear, or other damage.
Replace bearing as necessary. (See section 5 For
Bearing Replacement).
6. Inspect all threaded components for damage such
as stretching, thread deformation, or twisting.
Replace as necessary.
7. Inspect structural units of articulating jib boom
assembly for bending, cracking, separation of
welds, or other damage. Replace boom sections as
necessary.
Figure 4-23. Location of Components - Articulating
Jib Boom