JLG 680S Operator Manual - Manual (Page 57)

SECTION 4 - MACHINE OPERATION
3121233 – JLG Lift – 4-1
SECTION 4. MACHINE OPERATION
4.1 DESCRIPTION
This machine is a self-propelled hydraulic lift equipped with a
work platform on the end of an elevating and rotating boom.
The primary operator control station is in the platform. From
this control station, the operator can drive and steer the
machine in both forward and reverse directions. The opera-
tor can raise or lower the upper or lower boom or swing the
boom to the left or right. Standard boom swing is 360 degree
continuous left and right of the stowed position. The machine
has a Ground Control Station which will override the Platform
Control Station. Ground Controls operate Boom Lift and
Swing, and are to be used in an emergency to lower the plat-
form to the ground should the operator in the platform be
unable to do so. The Ground Control is also to be used in
Pre-Start Inspection.
4.2 OPERATING CHARACTERISTICS AND
LIMITATIONS
Capacities
The boom can be raised above horizontal with or without any
load in platform, if:
1. Machine is positioned on a smooth, firm and level sur-
face.
2. Load is within manufacturer’s rated capacity.
3. All machine systems are functioning properly.
4. Proper tire pressure.
5. Machine is as originally equipped from JLG.
Stability
Machine stability is based on two (2) conditions which are
called FORWARD and BACKWARD stability. The machine’s
position of least FORWARD stability is shown in (See Figure
4-2.), and its position of least BACKWARD stability is shown
in (See Figure 4-1.)