JLG 800A_AJ Operator Manual - Manual (Page 76)

SECTION 4 - MACHINE OPERATION
4-12 – JLG Lift – 3121627
Raising and Lowering the Tower Boom
This machine has two controls for the tower boom (two toggle
switches), one controls tower lift, the other tower telescope. The
switching system will sequence its Lift and Telescope functions as
follows:
1. Sequence while raising the Tower Boom from the fully low-
ered 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 ele-
vated “up” position.
a. Operate Tower Telescope “in” until Tower
Boom is fully retracted. (Tower must not lift
“down until boom is telescoped ”in” or “up”
fully.
b. The Tower lift “down” will only operate when
the Tower Boom is fully retracted.
TO AVOID TILTING MACHINE IF TOWER BOOM SWITCHING MALFUNCTIONS:
— LOWER PLATFORM TO GROUND USING MAIN BOOM LIFT AND TELESCOPE FUNC-
TIONS.
— HAVE CONDITION CORRECTED BY A CERTIFIED JLG SERVICE TECHNICIAN BEFORE
CONTINUING USE OF MACHINE.
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 PROB-
LEM TO THE PROPER SERVICE PERSONNEL. DO NOT OPERATE THE MACHINE UNTIL
THE CONDITION IS CORRECTED.