OPERATING PROCEDURES
35
Stability And Center Of Gravity
The center of gravity (CG) of any ob-
ject is the single point about which the
object is balanced in all directions.
Every object has a CG. When the lift
truck picks up a load, the truck and
load have a new combined CG.
CG Truck
Combined CG
CG Load
The stability of the lift truck is determined by the location
of its CG, or if the truck is loaded, the combined CG.
The lift truck has moving parts and therefore has a CG
that moves. The CG moves forward and back as the mast
is tilted forward and back. The CG moves up and down as
the mast moves up and down.
Combined CG
CG Load
CG Truck
The center of gravity, and therefore the stability of the
loaded lift truck, is affected by a number of factors such
as size, weight, shape, and position of the load; the height
to which the load is raised; the amount of forward and
backward tilt; tire pressure and the dynamic forces
created when the truck is moving. These dynamic forces
are caused by things like acceleration, braking, turning,
and operating on uneven surfaces or on an incline. These
factors must be considered when travelling with an un-
loaded truck, as well, because
an unloaded truck will
tip over to the side easier
than a loaded truck with its
load in the lowered position.
Property of American Airlines
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