JLG 680S, Service And Maintenance Manual

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SECTION 4 - BOOM & PLATFORM
3121234 4-31
Installation
1. Using a suitable lifting device, position boom assembly
on upright so that the pivot holes in both boom and
upright are aligned.
2. Install boom pivot pin, ensuring that location of hole in
pin is aligned with attach point on upright.
3. If necessary, gently tap pin into position with soft
headed mallet. Secure pin mounting hardware.
4. Align holes of boom assembly and timing link, install
pivot pin, ensuring that location of hole in pin is aligned
with attach point of timing link.
5. Using suitable lifting device, align main lift cylinder rod
end with mounting holes on boom assembly.
6. Extend the main lift cylinder by using the auxiliary
power switch. Using a suitable brass drift and hammer,
install hardware secured to the main lift cylinder rod end
pin into the base boom section.
7. Connect all wiring to the ground control box.
8. Connect all hydraulic lines running along side of boom
assembly.
9. Adjust retract and extend cables to the proper torque.
Refer to Section 4.9, Boom Rope Torquing Procedures.
10. Using all applicable safety precautions, operate machine
systems and raise and extend boom fully, noting the
performance of the extension cycle.
11. Retract and lower boom, noting the performance of the
retraction cycle.
TIMING LINK