JLG 600SC_660SJC Service Manual - Manual (Page 103)

SECTION 4 - BOOM & PLATFORM
3121607 – JLG Lift – 4-1
SECTION 4. BOOM & PLATFORM
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 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 slave leveling cylinder.
e. Support slave cylinder. Remove hardware from pin
#3. Remove pin #3 from fly boom with a suitable
brass drift and hammer.
f. Tag and disconnect hydraulic lines to slave leveling
cylinder. Use a suitable container for residual
hydraulic fluid. Cap hydraulic lines and ports.
Remove slave cylinder.
Figure 4-2. Rotator and Leveling Cylinder Locations
3. Remove powertrack from boom as follows:
a. Disconnect wiring harness from ground control box.
HYDRAULIC LINES AND PORTS SHOULD BE CAPPED IMMEDIATELY AFTER DIS-
CONNECTING LINES TO AVOID ENTRY OF CONTAMINANTS INTO SYSTEM.
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.