JLG 660SJ Service Manual - Manual (Page 177)

SECTION 4 - BOOM & PLATFORM
3121202 – JLG Lift – 4-5
g. Remove hardware securing the pushbar to the
turntable upright.
WHEN REMOVING PIN FROM PUSHBAR. CARE MUST BE TAKEN
NOT TO DROP THE PUSHBAR ONTO THE WIRE ROPE ADJUST-
MENT THREADS. FAILURE TO DO SO WILL RESULT IN DAMAGING
THREADS.
h. Using a suitable brass drift and hammer, remove
the push bar pin from the turntable upright.
i. Remove hardware securing the boom pivot pin
to the turntable upright.
j. Using a suitable brass drift and hammer, remove
the pivot pin from the turntable upright.
k. Using all applicable safety precautions, carefully
lift boom assembly clear of turntable and lower
to ground or suitably supported work surface.
Disassembly of Boom Sections
1. Remove hardware securing the push bar to aft end
of the telescope cylinder, then remove pin from cyl-
inder.
2. Remove hardware securing the cover plate on the
bottom front of the base boom section.
NOTE: Do not allow wire rope to rotate. This may damage
the wire rope.
3. Clamp both threaded ends of wire rope to prevent
rotation. Note: Do not clamp on threads. Remove
jam nuts and nuts which secure the wire rope
adjustments to the bottom front of the base boom
section.
NOTE: Step 4 is only applicable to CE specification
machines.
4. Remove the spring mounting plate, spring, and
proximity switch from the aft end of the base section.
5. Remove hardware securing the wire rope adjust-
ment block to aft end of the base boom section and
remove the block.
6. Remove hardware securing the telescope cylinder
to aft end of the mid boom section.
WHEN REMOVING THE TELESCOPE CYLINDER FROM THE BOOM,
IT MAY BE NECESSARY AT SOME POINT IN ORDER TO CLEAR
ASSEMBLIES MOUNTED WITHIN THE BOOM. CARE MUST BE
TAKEN TO MOVE THE CYLINDER SLOWLY FROM THE BOOM.
DAMAGE TO COMPONENTS MAY RESULT FROM FORCIBLE
IMPACT WITH THESE ASSEMBLIES.
7. Remove bolts securing wire rope attach bar to top of
fly boom section.
8. Pull the telescope cylinder and wire ropes partially
from aft end of the base boom section; secure the
cylinder with a suitable sling and lifting device at
approximately the center of gravity.
Figure 4-7. Disassembly of Proximity Switch
Assembly