JLG 660SJ Service Manual - Manual (Page 114)

SECTION 4 - BOOM & PLATFORM
4-12 – JLG Lift – 3120840
a. Align holes in powertrack rail with attachment
holes in side of the base boom section. Secure
the rail with mounting hardware.
b. Install powertrack to rail with mounting hard-
ware.
c. Attach push tube bracket to the side of the mid
boom section with mounting hardware.
NOTE: Do not over tighten attach bolt on push tube bracket.
It should pivot freely.
d. Install slide block and wear pads to the power-
track rail with mounting hardware.
e. Install powertrack to push tube with mounting
hardware.
f. Carefully feed the hoses and electrical cables
through the aft end of the powertrack rail, power-
track and push tube.
g. Ensure all hoses and cables are properly routed
through the powertrack rail, powertrack and
push tube. Tighten or install all clamping or
securing apparatus to the hoses or cables, as
necessary.
h. Install powertrack cover and push tube rods with
mounting hardware.
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.
Figure 4-16. Reassembly of Components - Boom
Powertrack Assembly