Service Manual Owner's manual

SECTION 4 - BOOM & PLATFORM
3121139 – JLG Lift – 4-1
SECTION 4. BOOM & PLATFORM
4.1 BOOM MAINTENANCE
Removal
1. Remove the platform/support as follows:
a. Disconnect electrical cable from control con-
sole.
b. Remove the eight (8) bolts securing the platform
to the platform support, then remove the plat-
form.
c. Using an overhead crane or suitable lifting
device, strap support the platform support.
d. Remove the six (6) bolts and locknuts securing
the support to the rotator.
e. Using a suitable brass drift and hammer, remove
the rotator shaft, then remove the support from
the rotator.
2. Remove the rotator and slave level cylinder from the
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.
c. Supporting the rotator, remove the hardware
from pin #2. Using a suitable brass drift and
hammer, remove pin #2 from the fly boom and
remove the rotator.
d. Telescope the fly section out approximately 20
inches (50.8 cm) to gain access to the leveling
cylinder.
e. Supporting the cylinder, remove the hardware
from pin #3. Using a suitable brass drift and
hammer remove pin #3 from the fly boom.
f. Tag and disconnect hydraulic lines to the level-
ing cylinder. Use a suitable container to retain
any residual hydraulic fluid. Cap hydraulic lines
and ports. Remove the leveling 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.
Figure 4-1. Location of Components - Platform Support
Figure 4-2. Location of Components - Rotator and
Leveling Cylinder