JLG 80HX, Service Maintenance Manual, Page: 43 / 120

SECTION 2 - PROCEDURES
3120863 – JLG Lift – 2-21
4. Disconnect, cap and tag the boom lift cylinder
hydraulic lines and ports.
5. Remove barrel end attach pin retaining hardware.
Using a suitable brass drift drive out the barrel end
attach pin from the turntable upright.
6. Remove the cylinder from the boom and place in a
suitable work area.
Boom Lift Cylinder Installation
1. Install the lift cylinder in place using suitable slings
or supports, aligning the attach pin mounting holes
on the turntable upright.
2. Using a suitable drift, drive the barrel end attach pin
through the mounting holes in the lift cylinder and
the turntable upright. Secure in place with the pin
retaining hardware.
3. Remove the cylinder port plugs and hydraulic line
caps and correctly attach the lines to the cylinder
ports.
4. Using auxiliary power, extend the cylinder rod until
the attach pin hole aligns with those in the boom.
Using a suitable drift, drive the cylinder rod attach
pin through the aligned holes, taking care to align
the grooved pin holes. Secure the pin in place with
attaching hardware.
5. Remove the boom prop and overhead crane. Acti-
vate the hydraulic system.
6. Using all applicable safety precautions, operate the
boom functions. Check for correct operation and
hydraulic leaks. Secure as necessary.
7. Check the fluid level of the hydraulic tank and adjust
as necessary.
2.11 TELESCOPE CYLINDER ECCENTRIC
BUSHING
RELOCATE ALTERNATE SETSCREW HOLE ONLY WHEN REPLAC-
ING ECCENTRIC BUSHING.
When replacing the eccentric bushings, drill 5/16" dia. x 3/
4" deep, tap 3/8-16NC x 9/16" deep for a new setscrew
(bushing to boom) either above or below original holes.
Allow enough room between the holes for strength while
staying on the thick side of the bushing. (See Figure 2-11.)
2.12 BOOM MAINTENANCE
Removal
1. Remove the platform from the boom assembly.
2. Remove the slave leveling cylinder from the boom
assembly.
NOTE: The boom assembly weighs approximately 2200 kg.
3. Using suitable lifting equipment, adequately support
the boom weight along the entire length of the
retracted boom.
Figure 2-11. Telescope Cylinder Eccentric Bushing