JLG 600SC_660SJC Service Manual - Manual (Page 55)

SECTION 4 - BOOM & PLATFORM
3120898 – JLG Lift – 4-15
Inspection
NOTE: When inspecting pins and bearings refer to Pins and
Composite Bearing Repair Guidelines in Section 2.
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.
Assembly
NOTE: For location of components See Section 4-17., 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 mount-
ing 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.
3. Align bottom tubes with attach holes in rotator sup-
port. Using a soft head mallet, install rotator support
pin #5 into articulating jib boom and secure with
mounting hardware.
4. Align articulating jib boom with attach hole in articu-
lating jib boom pivot weldment. Using a soft head
mallet, install rotator support pin #4 into articulating
jib boom and secure with mounting hardware.
5. Align bottom tubes with attach holes in articulating
jib boom pivot weldment. Using a soft head mallet,
install rotator support pin #3 into articulating jib
boom pivot weldment and secure with mounting
hardware.
6. Align articulating jib boom pivot weldment with
attach holes in fly boom assembly. Using a soft head
mallet, install pivot pin #2 into fly boom assembly
and secure with mounting hardware.
7. Align the slave leveling cylinder with attach holes in
articulating jib boom pivot weldment. Using a soft
head mallet, install slave leveling cylinder pin #1
into articulating jib boom pivot weldment and secure
with mounting hardware.
4.7 LIMIT SWITCH ADJUSTMENT
Adjust switches and cam valve as shown in Limit Switches
Adjustment.