JLG 660AJ Service Manual - Manual (Page 149)

SECTION 4 - BOOM & PLATFORM
3121616 – JLG Lift – 4-1
SECTION 4. BOOM & PLATFORM
4.1 MAIN BOOM MAINTENANCE
UNSECURED COMPONENTS CAN MOVE OR FALL AND CAUSE DEATH, SERIOUS
INJURY, OR DAMAGE TO PROPERTY AND EQUIPMENT. PROPERLY SECURE OR
SUPPORT ALL COMPONENTS.
CAP HYDRAULIC LINES AND PORTS IMMEDIATELY AFTER DISCONNECTING
LINES TO PREVENT SYSTEM CONTAMINATION.
Remove Rotator
Refer to Figure 4-1., Rotator, Platform Level Cylinder, and Jib Lift
Cylinder Installation.
600A
1. Tag and disconnect hydraulic lines to rotator (1). Use
suitable container to retain any hydraulic fluid. Cap
hydraulic lines and ports.
2. Remove screw and pin (2) from rotator (1) and platform
level cylinder (3).
3. Support rotator (1). Remove bolt and keeper pin (4).
Remove pin (5) using a suitable brass drift and hammer.
Remove rotator.
600AJ
1. Tag and disconnect hydraulic lines to rotator (8). Use
suitable container to retain any hydraulic fluid. Cap
hydraulic lines and ports.
2. Support left and right bottom tubes (9) to prevent fall-
ing when rotator is removed.
3. Remove nut (10) and bolt (11) from left and right bot-
tom tubes (9). Using a suitable brass drift and hammer
remove pin (12).
4. Support rotator (8). Remove bolt and keeper pin (13).
Remove pin (14) using a suitable brass drift and ham-
mer. Remove rotator.
Remove Platform Level (Slave) Cylinder
Refer to Figure 4-1., Rotator, Platform Level Cylinder, and Jib Lift
Cylinder Installation.
600A
1. Support platform or rotator if not removed.
2. Tag and disconnect hydraulic lines to platform level cyl-
inder (3). Use suitable container to retain any hydraulic
fluid. Cap hydraulic lines and ports.
3. Remove screw and pin (2) from rotator (1) and platform
level cylinder (3).
4. Support platform level cylinder. Remove bolt and
keeper pin (6). Remove pin (7) using a suitable brass drift
and hammer. Remove cylinder.
600AJ
1. Telescope boom fly section out approximately 20 inches
(50.8 cm) for access to platform level cylinder.
2. Support platform, jib, and rotator if not removed.
3. Tag and disconnect hydraulic lines to platform level cyl-
inder (15). Use suitable container to retain any hydraulic
fluid.
4. Remove bolt and keeper pin (16). Remove pin (17) using
a suitable brass drift and hammer.
5. Remove screw and pin (18) from platform level cylinder.
Remove cylinder
Remove Jib Lift Cylinder (600AJ Only)
Refer to Figure 4-1., Rotator, Platform Level Cylinder, and Jib Lift
Cylinder Installation.
1. Tag and disconnect hydraulic lines to jib lift cylinder
(19). Use suitable container to retain any hydraulic fluid.
Cap hydraulic lines and ports.
2. Support left and right bottom tubes (9) to prevent fall-
ing when cylinder is removed.
3. Support jib lift cylinder. Remove nut (20) and bolt (21)
from left and right bottom tubes (9). Using a suitable
brass drift and hammer remove pin (22).
4. Remove bolt and keeper pin (23). Remove pin (24) using
a suitable brass drift and hammer. Remove cylinder.