Service Manual Instruction Manual

SECTION 4 - BOOM & PLATFORM
3121171 – JLG Lift – 4-19
4.18 TOWER BOOM
Installation and Assembly
NOTE: To ease assembly of the tower base boom to the machine,
have the base section slightly tilted downward towards the
pivot pin bushings.
1. Use an overhead crane or other suitable lifting device,
and maneuver the tower boom base section in place.
Install the pivot pin. Install the keeper pin and apply Loc-
tite #271 to the retaining bolt. Torque the bolt to 285 ft.
lbs. (386 Nm).
NOTE: The tower lift cylinder weighs approximately 643 pounds
(292 kg).
2. Use a ratchet strap to carefully raise the lift cylinder up
into position under the boom.
3. Place blocking under the front of the tower base and
move the lifting strap out to the end of the tower base
section.
4. Lift the tower base section up and extend the lift cylin-
der to align it with the attachment lugs. Refer to the Ser-
vice Mode procedure in Section 4.24, Tower Lift Cylinder.
5. When the lift cylinder and tower base pivot holes are
aligned, install the pivot pin. Install the keeper pin and
apply Loctite #271 to the retaining bolt. Torque the bolt
to 285 ft. lbs. (386 Nm).