JLG 660SJ Service Manual - Manual (Page 123)

SECTION 4 - BOOM & PLATFORM
3120840 – JLG Lift – 4-21
16. Remove hardware securing 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 TO TURN THE
CYLINDER SLIGHTLY IN ORD ER TO CLEAR ASSEM BLIES
MOUNTED WITHIN THE BOOM. CARE MUST BE TAKEN TO MOVE
THE CYLINDER SLOWLY INTO POSITION: DAMAGE TO COMPO-
NENTS MAY RESULT FROM FORCIBLE IMPACT WITH THESE
ASSEMBLIES.
17. Remove bolts securing cable attach bar to top of fly
boom section.
18. Pull the telescope cylinder and cables partially from
aft end of the base boom section; secure the cylin-
der with a suitable sling and lifting device at approxi-
mately the center of gravity.
19. Carefully remove the telescope cylinder and sheave
assembly. Place telescope cylinder on a suitable
trestle.
Main Boom Telescope Cylinder Installation
1. Route extend cables around extend sheave and
secure cables to the telescope cylinder.
2. Install extend cables mounting blocks to threaded
ends of cables. Loosely install nuts and jam nuts
onto the threaded end of cables.
NOTE: When installing cables care must be taken not to
twist or cross the cables.
3. Secure the sling and lifting device at the telescope
cylinder’s approximate center of gravity, and lift the
cylinder to the aft end of the boom assembly.
4. Install extend cable mounting blocks to threaded
ends of cables. Loosely install nuts and jam nuts
onto the threaded ends of cables.
NOTE: When installing cables, care must be taken not to
twist or cross the cables.
5. Secure the sling and lifting device at the telescope
cylinder’s approximate center of gravity, and lift the
cylinder to the aft end of the boom assembly.
WHEN INSERTING THE TELESCOPE CYLINDER INTO THE BOOM,
IT MAY BE NECESSARY AT SOME POINT TO TURN THE CYLIN-
DER SLIGHTLY IN ORDER TO CLEAR ASSEMBLIES MOUNTED
WITHIN THE BOOM. CARE MUST BE TAKEN TO MOVE THE CYL-
INDER SLOWLY INTO POSITION: DAMAGE TO COMPONENTS
MAY RESULT FROM FORCIBLE IMPACT WITH THESE ASSEM-
BLIES.
6. Carefully install the telescope cylinder barrel end
support into slots in mid boom and secure with
blocks and bolts. Use Loctite #242 on bolts.
7. Align holes in aft end of the fly boom section with
holes in cable mounting block, then secure with
mounting hardware.
8. Align holes in aft end of the base boom section with
holes in cable mounting block, then secure with
mounting hardware.
9. Remove cylinder port plugs and hydraulic line caps
and correctly attach lines to cylinder ports.
10. Align holes in rod end of the telescope cylinder with
holes in push bar. Install push bar pin and secure
with mounting hardware.
11. Align holes in push bar with holes in turntable. Install
push bar pin and secure with mounting hardware.
NOTE: Boom cables must be torqued after installation of the
telescope cylinder. (See Section 4.1, Boom Rope
Torquing Procedures.)