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One of the most common reasons why forklift tip-overs happen is because of load miscalculation. While operator behavior can contribute to the risk of forklift accidents, the balance and placement of the load is a critical factor in determining whether the lift is safe.
The load weight matters. It’s also essential that the team understands forklift load moment vs. load center to ensure proper load placement and prevent accidents.
Why Forklifts Tip Over
Even though forklifts are designed to safely move large loads, there are a few risk factors that can cause a forklift to tip over. Here are some of the risk factors that can increase the likelihood of a tip-over:
- When the forklift is loaded, the combined center of gravity shifts forward.
- Operators often rely on the rated weight for the machine.
- Operators assume that all pallets have the same load center.
- If these safety limits (for both weight and load center) are exceeded, then it can cause a sudden loss of stability.
- Proper forklift load capacity calculation is the most important factor that will reduce the risk of failures and accidents.
What a Forklift Load Center Is
This forklift load center explanation can help you ensure safety for each load. The load center is calculated by measuring the horizontal distance from the fork face to the center of gravity of the load. It’s important that you check the load center rating for the specific forklift that you are using, because the requirements vary based on the type of forklift.
The most commonly rated load centers are 24, 36, and 48 inches. In most situations, forklifts are rated assuming that they are moving 48-inch pallets that are loaded evenly. If there are variations in the pallet size or loading, then it can cause unnecessary risk when the forklift picks up the pallet.
How Load Center Changes in Real Use
In real use situations, a few different circumstances can change the load center. For example, if the load is oversized (based on the rating for the forklift) or it is an uneven load, then it increases the load center distance and impacts safety.
Another reason why load center changes is if you are using attachments. These tools can be helpful, but operators must calculate how the attachments push the load farther from the mast.
Every forklift has a data plate with load center details. This information should be checked and double-checked by the operators and loading crew to ensure every load stays within the limits.
Why Load Center Reduces Capacity
When there is an increased distance between the load center and the front axle, it creates more leverage. Even if the load is lighter than the forklift’s rating, it can still cause a potential safety issue if the load is positioned too far forward.
This example shows why forklift load moment matters. Both weight and load positioning need to be considered to prevent the risk of tip-overs.
What a Forklift Load Moment Is
The forklift load moment is an essential part of the overall forklift load capacity calculation. This measurement goes beyond the weight of the load because it factors in tipping force.
This is the best way to calculate the forklift load moment:
- Forklift load weight multiplied by the load center distance
The calculation represents the force that is acting to tip the forklift forward because of the placement of the load.
Rated Load Moment vs. Actual Load Moment
Every forklift has a rated load moment, which is based on the factory conditions of the machine. When changes are made, such as adding attachments or adjusting the load size/height, it impacts the actual load moment.
Not only do you need to be careful to not exceed the rated load moment, but the actual load moment should also not be exceeded. If the actual moment is exceeded, then it causes the forklift to be unstable.
Load Moment vs. Load Center Explained Simply
Keep in mind that there is a difference between load center and load moment forklift calculations.
- Load Center: This measurement describes the position of the load.
- Load Moment: This measurement describes the risk of the load at any given time.
In order to ensure safe operation, both the forklift load moment vs. load center need to stay within rated limits. Operators must consider all relevant factors, including the type of forklift, attachments that are being used, the weight of the load, and how the load is placed on the pallet.
How Attachments Affect Load Capacity
When attachments are being used, they shift the load forward, which changes the load center. For example, if you are using fork extensions, then they dramatically increase the load moment. Other attachments, such as side shifters and clamps, also reduce the rated capacity.
In order to maintain compliance, the forklift data plates must be updated after the machine is modified with attachments. Forklifts should not be operated without a current data plate based on the load ratings for the new conditions.
FAQs
What happens if the load center exceeds the forklift rating?
When a forklift load center changes and exceeds the ratings, then the forklift becomes unstable. The risk of tipping forward increases because of the instability.
Can a forklift lift more weight at a shorter load center?
Yes, when the load center is shorter, then the forklift’s load moment is reduced, and stability is improved. As a result, it’s possible for the forklift to handle more weight.
How do attachments affect forklift capacity?
Since attachments increase the load center distance, the forklift’s safe lifting capacity is reduced with the use of attachments.
Is load moment listed on the forklift data plate?
Data plates do not list the load moment. You can find other essential information on the data plates, such as capacity and load center. But the load moment must be calculated based on the current conditions.
Safer Lifts Start with Load Awareness
While load weight is important, load moment can’t be overlooked. Make sure that all operators and loading crews are well-trained on these calculations and how the load center has a direct impact on the forklift’s capacity and stability.
This proactive approach not only reduces the risk of accidents but can also help you avoid OSHA violations at the same time.
For more information about forklift safety and equipment maintenance, ACE Equipment is always here to assist. We offer full services in the forklift industry, including rentals, sales, maintenance, repairs, and more. Contact us if you need support with your forklift fleet.
