JLG 660SJ Service Manual - Manual (Page 118)

SECTION 4 - BOOM & PLATFORM
4-16 – JLG Lift – 3120840
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. Connect all wiring connectors to the correct connec-
tors.
5. Connect all hydraulic lines running along side of
boom assembly.
6. 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.
7. 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.
8. Using all applicable safety precautions, operate
machine systems and raise and extend boom fully,
noting the performance of the extension cycle.
9. Retract and lower boom, noting the performance of
the retraction cycle.
4.6 TOWER BOOM
Removal
1. Remove the tower upright as follows:
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDI-
ATELY AFTER DISCONNECTING LINES TO AVOID ENTRY OF
CONTAMINANTS INTO SYSTEM.
a. Tag and disconnect hydraulic lines to upper lift
cylinder. Use suitable container to retain any
residual hydraulic fluid. Cap hydraulic lines and
ports.
b. Using suitable lifting device, support the upper
lift cylinder.
c. Remove mounting hardware from upper lift cyl-
inder barrel end. Using a suitable brass drift and
hammer remove pin #1 from tower upright.
d. Tag and disconnect hydraulic lines to master cyl-
inder. Use a suitable container to retain any
residual hydraulic fluid. Cap hydraulic lines and
ports.
e. Remove mounting hardware from master cylin-
der barrel end. Using a suitable brass drift and
hammer remove pin #2 from tower upright.
f. Disconnect wiring hardness to horizontal limit
switch and dual capacity limit switch.
g. Using a suitable lifting device, support the tower
upright.
h. Remove mounting hardware securing hose
bracket in tower upright, remove hose bracket.
i. Remove mounting hardware from tower leveling
cylinder. Using a suitable brass drift and ham-
mer remove pin #3 from tower upright.
j. Remove mounting hardware from upright pivot
pin. Using a suitable brass drift and hammer,
remove pin #4 from tower upright. Remove
upright from tower boom assembly.
2. Remove the tower boom as follows:
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDI-
ATELY AFTER DISCONNECTING LINES TO AVOID ENTRY OF
CONTAMINANTS INTO SYSTEM.
a. Tag and disconnect all hydraulic lines from the
tower boom assembly to turntable components.
Use suitable container to retain any residual
hydraulic fluid. Cap hydraulic lines and ports.
b. Disconnect wiring harness from the ground con-
trol box.
Figure 4-20. Location of Components - Upright