JLG 800AJ HC3 Operation & Safety Manual page 34

User Responsibilities, Machine Preparation, and Inspection
Discontinue operation if plunger is not fully extended.
b. Attempt to extend the tower fly boom. The tower fly boom should not
extend and the red boom malfunction light in the ground control panel
should illuminate when pressing the tower telescope switch.
Discontinue operation if the tower fly boom extends or the boom malfunction light
does not illuminate.
c. Raise the tower base boom to approximately 40 degrees, then lower the
tower boom back to the below horizontal position. While raising and
lowering the tower boom assembly, observe the position of the upright.
Ensure that the upright remains vertical relative to the chassis. Refer to
— Boom Upright Positioning - Correct, page 36
Positioning - Incorrect, page
Discontinue operation if the upright is out of alignment or the boom malfunction
light is flashing or on steady.
d. Raise the tower base boom to full height. Extend the tower fly boom a few
feet. Check that the plunger on the tower boom horizontal limit switch at the
end of the tower base boom section is fully extended. The plunger is shown
fully extended in
34
Figure 3. Tower Boom Vertical Limit Switch
WARNING
WARNING
37.
WARNING
Figure — Tower Boom Horizontal Limit Switch, page
31222411
BM000501A
and Figure — Boom Upright
Figure
35.
800AJ HC3