Articulating Jib Boom; Removal; Disassembly; Inspection - JLG E450A Service And Maintenance Manual

SECTION 4 - BOOM & PLATFORM

4.8 ARTICULATING JIB BOOM

Removal

1. For platform/support removal see platform/support
removal diagram. See Section 4.1, Platform.
2. Position the articulating jib boom level with ground.
3. Remove mounting hardware from slave leveling cylin-
der pin #1. Using a suitable brass drift and hammer,
remove the cylinder pin from articulating jib boom.
Figure 4-6. Location of Components - Articulating Jib
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 cyl-
inder pin from articulating jib boom.
4-12
Boom

Inspection

NOTE: When inspecting pins and bearings refer to Section
2, Pins and Composite Bearing Repair Guidelines.
1. Inspect articulating fly boom pivot pin for wear, scoring,
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 damage.
Replace bearings as necessary. (See Section 5, Cylinder
Repair For Bearing Replacement).
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 neces-
sary.
5. Inspect inner diameter of rotator attach point bearings
for scoring, distortion, wear, or other damage. Replace
bearing as necessary. (See Section 5, Cylinder Repair 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 assem-
bly for bending, cracking, separation of welds, or other
damage. Replace boom sections as necessary.

Assembly

NOTE: For location of components See Figure 4-6., Loca-
tion of Components - Articulating Jib Boom.
1. Align lift cylinder with attach holes in articulating jib
boom. Using a soft head mallet, install cylinder pin #7
into articulating jib boom and secure with mounting
hardware.
2. Align rotator support with attach hole in articulating jib
boom. Using a soft head mallet, install rotator support
pin #6 into articulating jib boom and secure with
mounting hardware.
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