How Does Load Center Affect Electric Pallet Stacker Capacity?

In the selection of an Electric Pallet Stacker, the Load Centre Distance is the most easily overlooked yet critically important parameter. Many buyers focus only on the rated load capacity value, ignoring the significant fluctuations in actual load capacity when the load centre distance changes—which directly affects operational safety and equipment lifespan during high-level stacking operations. This article systematically explains the definition of load centre distance, its mechanism of impact on lifting capacity, and practical selection considerations.

1. What Is Load Centre Distance?

Load Centre Distance is the horizontal distance from the vertical face of the forks to the centre of gravity of the loaded cargo, typically denoted by the letter "C" and measured in millimetres (mm).

For standard pallets (typically 1200×1000mm or 1200×800mm), the cargo centre of gravity is assumed to be at the pallet's geometric centre, giving a load centre distance of 500mm. This is the benchmark value used in the design of the vast majority of electric pallet stackers.

Example: When the CDDA20 is rated at 2000kg, the implicit precondition is that the load centre distance is 500mm. If the cargo's centre of gravity shifts forward (increasing the load centre distance), the actual safe load capacity decreases accordingly.

2. Mechanism of Load Centre Distance Impact on Lifting Capacity

The effect of load centre distance on stacker lifting capacity follows the lever principle—the farther the distance from the fulcrum (front wheel axle), the greater the overturning moment generated by the same weight.

Industry Example: In one brand's 1.2-1.6 ton electric pallet stacker series, the load centre distance is set at 600mm; another brand's 2-ton class stacker also uses a 600mm load centre distance. This means that for two machines both nominally rated at 2 tons, if the load centre distance changes from 500mm to 600mm, the actual safe load capacity may drop by approximately 10%-15%.

CDDA20 Measured Data: Taking the 2T Electric Walkie Pallet Stacker CDDA as an example, its load centre distance is 500mm with a rated capacity of 2000kg. At different lift heights, the residual load capacity is as follows:

• At 1600mm lift height: residual capacity 2000kg

• At 2500mm lift height: residual capacity 1500kg

• At 3500mm lift height: residual capacity 1100kg

Core Rule: The effects of load centre distance and lift height on load capacity are cumulative—the greater the centre distance and the higher the lift, the faster the residual capacity decreases.

3. How to Apply Load Centre Distance in Actual Selection?

3.1 Confirm Your Pallet Type and Load Centre Distance

Before selection, measure or confirm:

• Pallet length (forks insertion direction)

• Actual position of the cargo centre of gravity on the pallet

If you use non-standard pallets (length >1200mm or forward-biased cargo centre of gravity), it is recommended to measure the actual load centre distance rather than using the default value.

3.2 Check the Load Capacity Chart

The load capacity chart provided by the supplier should clearly indicate rated and residual load capacities at different load centre distances. When selecting, find the curve corresponding to your actual load centre distance—do not directly apply the 500mm standard value.

3.3 Reserve a Safety Margin

If your load centre distance approaches or exceeds 600mm, it is recommended to:

• Choose a model with higher rated capacity (e.g., upgrading from 1.5 tons to 2 tons)

• Or choose a model with a larger design load centre distance

Product Reference: Diding Lift's CDDA20 uses a 500mm standard load centre distance, 2000kg rated capacity, and 3500mm maximum lift height as its benchmark parameters. For applications with load centre distances exceeding 500mm, it is advisable to consult the manufacturer for corresponding load capacity curve data, or consider a larger model such as a stand-on stacker.

4. Conclusion and Action Recommendations

Load centre distance is the "hidden ceiling" of an Electric Pallet Stacker's lifting capacity. Focusing only on rated capacity while ignoring load centre distance can lead to overloading during high-level stacking, resulting in tip-over risks or reduced equipment lifespan.

To ensure long-term operational safety and equipment reliability, choosing a machine with clear load capacity chart specifications and robust structural design is essential. Diding Lift has 12 years of experience and a 65,000 m² factory & workshop, with products holding Europe EN & ISO, CE, EU Certificates, and supports ODM/OEM cooperation & customization. Its 2T Electric Walkie Pallet Stacker CDDA, featuring a 500mm standard load centre, 2000kg rated capacity, and 3500mm maximum lift height, delivers stable lifting performance across different load centre distances—a mature choice balancing performance and compliance.

For detailed load capacity curves and selection recommendations tailored to your pallet specifications, please send an email to sales@didinglift.com, and our professional team will provide one-on-one support.

References:

1. China Longgong. CPDS10/13/15-EC5-E series counterbalance stacker product specifications. Load centre 500mm.

2. KION Baoli. 1.2-1.6T Electric Pallet Stacker specifications. Load centre 600mm.

3. Diding Lift. 2Ton Full Electric Stacker Walkie Electric Pallet Forklifts CDDA20. Load centre 500mm; residual capacity 1100kg@3500mm.

4. XGMA. Electric Pallet Stacker E Series 2-4Ton. Load centre 600mm.

5. China Longgong. CPD05/07-E1C-E series counterbalance stacker. Load centre 400mm.

6. Diding Lift. 2T Electric Pallet Stacker product page. Technical parameters of CDDA20.

7. Diding Lift. How to Choose a 2 Ton Electric Pallet Stacker. Load centre 500mm; residual capacity at 3500mm is 1100kg.

8. China Longgong. CPD12-E2C1-E series counterbalance stacker. Load centre 400mm.