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Gravity center and stability
The combined gravity center that is composed of the
forklift center and the load gravity center determine the
stability of lift trucks.
When unloaded, the barycenter does not change;
when loaded, the barycenter is determined by the truck
and the load‟s center.
The barycenter is also determined by the tilting and
lifting of the mast.
The combined center is determined by these factors:
– Load‟s size, weight and shape
– The lifting height
– The tilting angle
– The acceleration
– The radius of turning
– The road and grade‟s angle
– The attachments
The stable region of the load center
In order to make the truck stable, the combined center must
be in the triangle which is made up of two points that the two
front wheels attach ground and the midpoint of the back axle.
If the combined center is in the front driving axle, the two front
wheels become two fulcrums, the truck will overturn. If the
combined center departures the triangle, the trucks shall
overturn in the corresponding direction.
The chart given shows the relation between the load
center and the weight of loads.
Before loading, make sure that the load and the load
center distance in the range of capacity chart. If the
load‟s shape is complex, put the most weightily part on
the middle of the forks, and close to the fork carriage.
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