JLG 800A Operation And Safety Manual page 36

SECTION 2 - 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 malfunc-
tion 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 MAL-
FUNCTION 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 rela-
tive 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
2-12
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.
Figure 2-8. Tower Boom Horizontal Limit Switch
DISCONTINUE OPERATION IF PLUNGER IS NOT FULLY EXTENDED
– JLG Lift – 3121209