JLG G6-23A Service Manual - Manual (Page 25)

3.3 G5-19A, G6-23A
Boom
3.2 BOOM SYSTEM - TWO SECTION
BOOM
3.2.1 Boom System Description
The boom operates via an interchange among the
electrical, hydraulic and mechanical systems. Components
involved include the joystick, tilt cylinder, extend/retract
cylinder, lift/lower cylinder, compensating cylinder,
electronic sensors, various pivots, supporting hardware
and other components.
3.3 BOOM ASSEMBLY MAINTENANCE
The boom assembly consists of the first and second
section booms and supporting hardware.
IMPORTANT: Boom replacement must be completed in
sequence, one boom section at a time, as described in
these instructions.
IMPORTANT: Before removing the boom, the carriage
or any other attachment must be removed from the quick
attach.
Before beginning, conduct a visual inspection of the
machine and work area, and review the task about to be
undertaken. Read, understand and follow these
instructions.
During service of the boom, perform the following:
1. Check wear pads. (Refer to Section 3.4.1, “Wear
Pad Inspection.”)
2. Apply grease at all lubrication points (grease fittings).
(Refer to Section 2.6, “Lubrication Schedules.”)
3. Check for proper operation by operating all boom
functions through their full ranges of motion several
times.