Boom & Platform; Boom Systems; Removal - JLG 660SJ Service And Maintenance Manual

4.1 BOOM SYSTEMS

Removal

1. Remove platform/support as follows:
a. Disconnect electrical cable from control console.
b. Remove eight bolts securing platform to platform
support and remove the platform.
c. Using an overhead crane or suitable lifting device,
strap support platform support.
d. Remove six bolts and locknuts securing support to
rotator.
e. Using a suitable brass drift and hammer, remove
rotator shaft, then remove support from rotator.
Figure 4-1. Location of Components - Platform Support
2. Remove rotator and platform (slave) level cylinder from
fly boom as follows:
a. Tag and disconnect hydraulic lines to rotator. Use
suitable container for residual hydraulic fluid. Cap
hydraulic lines and ports.
b. Remove hardware from pin #1. Remove pin #1 from
fly boom with a suitable brass drift and hammer.
c. Support rotator. Remove hardware from pin #2.
Remove pin #2 from fly boom with a suitable brass
drift and hammer. Remove rotator.
d. Telescope fly section out approximately 20 inches
(50.8 cm) to access platform (slave) leveling cylinder.
e. Support platform (slave) level cylinder. Remove
hardware from pin #3. Remove pin #3 from fly
boom with a suitable brass drift and hammer.
3121298
SECTION 4. BOOM & PLATFORM
Figure 4-2. Rotator and Leveling Cylinder Locations
3.
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDIATELY AFTER DIS-
CONNECTING LINES TO AVOID ENTRY OF CONTAMINANTS INTO SYSTEM.
– JLG Lift –
SECTION 4 - BOOM & PLATFORM
f. Tag and disconnect hydraulic lines to platform
(slave) leveling cylinder. Use a suitable container for
residual hydraulic fluid. Cap hydraulic lines and
ports. Remove platform (slave) level cylinder.
Remove powertrack from boom as follows:
a. Disconnect wiring harness from ground control box.
b. Tag and disconnect hydraulic lines from boom to
control valve. Use a suitable container for residual
hydraulic fluid. Cap hydraulic lines and ports.
c. Disconnect 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 sup-
port powertrack weight along entire length.
f. Remove bolts #1 securing push tube on fly boom
section.
g. Remove bolts #2 securing push tube on mid boom
section.
4-1