Raising the Load Can Create Instability
As the load is raised, it becomes possible for the forklift to fall to the side as well as tip forward because the combined CG might move outside the stability triangle.
As the load is raised, it becomes possible for the forklift to fall to the side.
The operator must consider the CG of the forklift and load together.
- The combined CG moves forward as the forklift is loaded.
- The combined CG also moves as the load is moved and as the forklift travels over surfaces that are rough or inclined.
The combined CG can move outside the stability triangle if:
If the load CG moves outside the Safety Triangle, the forklift may tip forward.
- The load is picked up on the tip of the forks.
- The load is tilted forward.
- The load is tilted too far back when raised.
- The load is wide.
- Forklift movement causes the center of gravity to shift.
These actions will have the following effects:
- Tilting the load forward moves the combined CG toward the front axle.
- Tilting the load back moves the combined CG toward the rear axle.
- Driving uphill across an inclined surface moves the combined CG toward the downhill side of the triangle.
- Driving across rough or uneven surfaces moves the combined CG toward the rut or low side of the triangle.
- Turning moves the combined CG toward the side now facing the original direction of travel.
Knowledge Check Choose the best answer for the question.
3-6. What happens to the combined center of gravity (CG) when a forklift is driven uphill across an inclined surface?
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