Boom Disassembly/Assembly & Cable Replacement; Boom Section Disassembly - JLG 660SJ Service And Maintenance Manual

4.3 BOOM DISASSEMBLY/ASSEMBLY & CABLE
REPLACEMENT

Boom Section Disassembly

1. Remove hardware securing push bar to aft end of tele-
scope cylinder. Remove pin from cylinder.
2. Remove hardware securing cover plate on bottom front
of base boom section.
DO NOT ALLOW WIRE ROPE TO ROTATE. THIS MAY DAMAGE THE WIRE ROPE.
3. Clamp both threaded ends of wire rope to prevent rota-
tion. Note: Do not clamp on threads. Remove jam nuts
and nuts which secure wire rope adjustments to bottom
front of base boom section.
Figure 4-5. Clamping Wire Ropes
NOTE: CE specification machines go to Step 4. All other machines
go to Step 5.
3121298
4. Remove spring mounting plate, spring, and proximity
switch from aft end of base section.
Figure 4-6. Proximity Switch Assembly Disassembly
5. Remove hardware securing wire rope adjustment block
to aft end of base boom section and remove block.
6. Remove hardware securing telescope cylinder to aft end
of mid boom section.
WHEN REMOVING TELESCOPE CYLINDER FROM BOOM, IT MAY BE NECESSARY
TO TURN CYLINDER SLIGHTLY TO CLEAR ASSEMBLIES MOUNTED IN BOOM.
MOVE CYLINDER SLOWLY OUT OF POSITION. DAMAGE TO COMPONENTS MAY
RESULT FROM FORCIBLE IMPACT WITH ASSEMBLIES.
7. Remove bolts securing wire rope attach bar to top of fly
boom section.
8. Pull telescope cylinder and wire ropes partially from aft
end of base boom section. Secure cylinder with a suit-
able sling and lifting device at center of gravity.
– JLG Lift –
SECTION 4 - BOOM & PLATFORM
4-3