JLG 660SJ ANSI Service Manual - Manual (Page 150)

SECTION 4 - BOOM & PLATFORM
4-14 – JLG Lift – 3120718
Installation
1. Using a suitable lifting device, position boom
assembly on turntable so that the pivot holes in both
boom and turntable are aligned.
2. Install boom pivot pin, ensuring that location of hole
in pin is aligned with attach point on turntable.
3. If necessary, gently tap pin into position with soft
headed mallet. Secure pin mounting hardware.
4. Align push bar pivot hole with pivot holes in turnta-
ble. Install push bar pivot pin, ensuring that location
of hole in pin is aligned with attach point on turnta-
ble.
5. If necessary, gently tap pin into position with soft
headed mallet. Secure pin mounting hardware.
6. Connect all wiring to the ground control box.
7. Connect all hydraulic lines running along side of
boom assembly.
8. Using all applicable safety precautions, operate lift-
ing device in order to position boom lift cylinder so
that holes in the cylinder rod end and boom struc-
ture are aligned. Insert the lift cylinder pin, ensuring
that location of hole in pin is aligned with attach
point on boom.
9. Align holes in boom structure with hole in master
cylinder. Insert the master cylinder pin, ensuring that
location of hole in pin is aligned with attach point on
boom.
10. Adjust retract and extend cables to the proper
torque. Refer to paragraph 2-6, boom cable torque
procedures.
11. Using all applicable safety precautions, operate
machine systems and raise and extend boom fully,
noting the performance of the extension cycle.
12. Retract and lower boom, noting the performance of
the retraction cycle.
4.5 BOOM MAINTENANCE (A MODELS)
Removal
1. For platform/support removal see platform/support
removal diagram. (Boom Maintenance. S Models).
2. Remove rotator and slave level cylinder from fly
boom as follows:
a. Tag and disconnect hydraulic lines to rotator.
Use suitable container to retain any residual
hydraulic fluid. Cap hydraulic lines and ports.
b. Remove hardware from pin #1. Using a suitable
brass drift and hammer remove pin #1 from the
fly boom.
c. Supporting the rotator, remove hardware from
pin #2. Using a suitable brass drift and hammer
remove pin #2 from the fly boom and remove
rotator.
d. Telescope boom fly section out approximately
20 inches (50.8 cm) to gain access to slave lev-
eling cylinder. (600AJ Model)
e. Supporting the slave cylinder, remove the hard-
ware from pin #3. Using a suitable brass drift
and hammer, remove pin #3 from the fly boom.
f. Tag and disconnect hydraulic lines to slave level-
ing cylinder. Use suitable container to retain any
residual hydraulic fluid. Cap hydraulic lines and
ports. Remove slave cylinder.
3. Remove powertrack from boom as follows:
a. Disconnect wiring harness connectors located in
tower upright.
Figure 4-16. Reassembly of Components - Rotator and
Slave Leveling Cylinder