JLG 800A_AJ Operator Manual - Manual (Page 32)

SECTION 2 - USER RESPONSIBILITIES, MACHINE PREPARATION, AND INSPECTION
2-12 – JLG Lift – 3121209
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 mal-
function 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 lower-
ing the tower boom assembly, observe the position
of the upright. Ensure that the upright remains verti-
cal relative to the chassis. Refer to Figure 2-9. and
Figure 2-10.
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
Figure 2-8.
DISCONTINUE OPERATION IF PLUNGER IS NOT FULLY EXTENDED
Figure 2-8. Tower Boom Horizontal Limit Switch