JLG 660SJ Service Manual - Manual (Page 176)

SECTION 4 - BOOM & PLATFORM
4-4 – JLG Lift – 3121202
retain any residual hydraulic fluid. Cap hydraulic
lines and ports. Remove the slave cylinder.
3. Remove the powertrack from the boom as follows:
a. Disconnect wiring harness from ground control
box.
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDI-
ATELY AFTER DISCONNECTING LINES TO AVOID ENTRY OF CON-
TAMINANTS INTO SYSTEM.
b. Tag and disconnect hydraulic lines from boom
to control valve. Use a suitable container to
retain any residual hydraulic fluid. Cap hydraulic
lines and ports.
c. Disconnect the dual capacity indicator limit
switch from side of boom section.
d. Remove hydraulic lines and electrical cables
from powertrack.
e. Using a suitable lifting equipment, adequately
support powertrack weight along entire length.
f. Remove bolts #1 securing the push tube on the
fly boom section.
g. Remove bolts #2 securing the push tube on the
mid boom section.
h. With powertrack support and using all applica-
ble safety precautions, remove bolts #3 and #4
securing rail to the base boom section. Remove
powertrack from boom section.
4. Remove boom assembly from machine as follows:
a. Using suitable lifting equipment, adequately
support boom assembly weight along entire
length.
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDI-
ATELY AFTER DISCONNECTING LINES TO AVOID ENTRY OF CON-
TAMINANTS INTO SYSTEM.
b. Tag and disconnect hydraulic lines from tele-
scope cylinder. Use a suitable container to retain
any residual hydraulic fluid. Cap hydraulic lines
and ports.
c. Remove hardware securing the lift cylinder rod
end to the base boom section.
d. Using a suitable brass drift and hammer, remove
the lift cylinder pin from the base boom.
e. Remove hardware securing the master cylinder
rod end to the base boom section.
f. Using a suitable brass drift and hammer, remove
the master cylinder pin from the base boom.
Figure 4-5. Location of Components - Rotator and
Leveling Cylinder
Figure 4-6. Location of Components - Boom Powertrack