JLG 660SJ Operator Manual - Manual (Page 56)

SECTION 4 - MACHINE OPERATION
4-2 – JLG Lift – 3121297
Stability
Machine stability is based on two positions which are called
FORWARD and BACKWARD stability. The machines position
of least FORWARD stability is shown in Figure 4-2., Position
of Least Forward Stability, and its position of least BACK-
WARD stability is shown in Figure 4-1., Position of Least
Backward Stability.
TO AVOID FORWARD OR BACKWARD TIPPING, DO NOT OVERLOAD
MACHINE OR OPERATE THE MACHINE ON AN OUT-OF-LEVEL SURFACE.
Figure 4-1. Position of Least Backward Stability