JLG 660SJ Service Manual - Manual (Page 187)

SECTION 4 - BOOM & PLATFORM
3121202 – JLG Lift – 4-15
8. Using all applicable safety precautions, operate lift-
ing device in order to position boom lift cylinder so
that holes in the cylinder rod end and boom struc-
ture are aligned. Insert the lift cylinder pin, ensuring
that location of hole in pin is aligned with attach
point on boom.
9. Align holes in boom structure with hole in master
cylinder. Insert the master cylinder pin, ensuring that
location of hole in pin is aligned with attach point on
boom.
10. Adjust retract and extend cables to the proper
torque. Refer to paragraph 2-6, boom cable torque
procedures.
11. Using all applicable safety precautions, operate
machine systems and raise and extend boom fully,
noting the performance of the extension cycle.
12. Retract and lower boom, noting the performance of
the retraction cycle.
4.5 ARTICULATING JIB BOOM
Removal
1. For platform/support removal see platform/support
removal diagram. See Section 4.4, Boom Mainte-
nance.
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: When inspecting pins and bearings 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.
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 4-18. Location of Components - Articulating
Jib Boom