JLG 600SC Service And Maintenance Manual page 126

SECTION 4 - BOOM & PLATFORM
7. Remove hardware securing valve to telescope cylinder.
Remove the valve assembly.
8. Remove the four bolts, shims, and block that secure the
telescope cylinder rod to the boom base section.
4-10
9. Attach an auxiliary hydraulic power source to the tele-
scope cylinder and extend the cylinder rod enough to
turn the trunnion in a vertical position.
10. Pull the mid and fly boom sections from the base boom
MAE22950
section. Use additional lifting device and lifting straps as
necessary as the sections are withdrawn. It will be help-
ful during this step to pull the mid retract cable out from
the front of the boom section as the other sections are
being pulled out. This will prevent the cables from tan-
gling as the sections are withdrawn.
11. Remove the trunnion blocks that secure the telescope
cylinder barrel to the inner mid boom section.
MAE22960
MAE22970
MAE22990
3121776