JLG 800A_AJ Operator Manual - Manual (Page 74)

SECTION 4 - MACHINE OPERATION
4-12 – JLG Lift – 3121209
Function of Tower Boom
This machine will have two controls for the tower boom (two
toggle switches), one controls tower lift, the other tower tele-
scope. The switching system will sequence its LIFT and
TELESCOPE functions as follows:
1. Sequence while RAISING the TOWER BOOM from the
fully lowered position.
a. The TOWER BOOM must be fully elevated “up”
(approximately 12 degrees from vertical) before the
TOWER BOOM can be extended from the fully
retracted position.
b. The TOWER TELESCOPE “out” or “in” will only be
operable when the TOWER BOOM is fully elevated
“up”.
2. Sequence while LOWERING the TOWER BOOM from
the fully elevated “up” position.
a. TOWER TELESCOPE “in”. The TOWER BOOM
must be fully retracted before the TOWER BOOM
can be lowered.
b. The TOWER BOOM lift “down” will only be operable
when the TOWER BOOM is fully retracted.
DISCONTINUE OPERATION IF THE UPRIGHT IS OUT OF ALIGNMENT OR
THE BOOM MALFUNCTION LIGHT REMAINS ILLUMINATED.
IF THE UPRIGHT IS OUT OF ALIGNMENT WITH THE PLATFORM RAISED,
LOWER THE MAIN BOOM AND TELESCOPE OUT UNTIL THE PLATFORM
REACHES THE GROUND. THE TOWER BOOM DOWN FUNCTION IS CUT
OUT IN THIS CONDITION. REPORT THE PROBLEM TO THE PROPER SER-
VICE PERSONNEL. DO NOT OPERATE THE MACHINE UNTIL THE CONDI-
TION IS CORRECTED.