JLG G5-18A Service Manual - Manual (Page 35)

3-3 G5-18A, 2505H, 25.5
Boom
3.2 SAFETY INFORMATION
3.3 TWO SECTION BOOM SYSTEM
3.3.1 Boom System Description
Boom operates via an interchange among electrical,
hydraulic and mechanical systems. Components
involved include joystick, tilt cylinder, extend/retract
cylinder, lift/lower cylinder, compensating cylinder,
electronic sensors, various pivots, supporting hardware
and other components.
3.4 BOOM ASSEMBLY MAINTENANCE
Boom assembly consists of first and second section
booms and supporting hardware.
Note: Before removing boom or boom section, carriage
or any other attachment must be removed from quick
attach assembly.
Before beginning, conduct a visual inspection of machine
and work area, and review task about to be undertaken.
Read, understand and follow these instructions.
During service of boom, perform following:
1. Check wear pads. (Refer to Section 3.5.1, “Wear
Pad Inspection.”)
2. Apply grease at all lubrication points (grease fittings).
(Refer to Section 2.6, “Lubrication Schedule.”)
3. Check for proper operation by operating all boom
functions through their full ranges of motion
several times.
Depending on your particular circumstance, the following
procedures explain removal/installation of complete
boom or removal/installation of individual boom sections.
3.4.1 Complete Boom Removal
1. Remove any attachment from quick attach assembly.
2. Park machine on a hard, level surface.
3. Fully retract boom, lower boom, place transmission
control lever in (N) NEUTRAL.
4. Engage park brake and shut engine OFF.
5. Place a Do Not Operate Tag on both ignition key
switch and steering wheel.
6. Allow system fluids to cool.
7. Remove the quick attach assembly. Refer to Section
3.6.1, “Quick Attach Assembly Removal.”
Note: The use of two slings will allow for better stability.
8. Start machine and raise boom to position that will
allow for pin (1) to clear frame for removal.
9. Remove the lock bolt (2) and pin (1) from
compensating cylinder.
WARNING
DO NOT service the machine without following all
safety precautions as outlined in the “Safety Practices”
section of this manual.
WARNING
NEVER weld or drill the boom unless approved in
writing by the manufacturer. The structural integrity of
the boom will be impaired if subjected to any repair
involving welding or drilling.
MY8570
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