How to Choose a Stacker Crane Manufacturer for an AS/RS Project

Choose a stacker crane manufacturer by checking whether it can design the crane around your warehouse data, integrate it with the wider AS/RS, and support the project from engineering through commissioning. Compare suppliers using the same requirements for load, storage height, throughput, aisle layout, operating environment, controls, and service. Do not select on crane price alone: compatibility with the rack structure, warehouse control system, and future operating needs can affect the performance and cost of the entire project.

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A useful first step is to prepare a written specification and ask each manufacturer to respond against it. For example, a hypothetical RFQ might state a unit load of 1,000 kg, a lift height of 24 m, and a target throughput of 30 pallet moves per hour. These are illustrative requirements, not standard crane ratings or a recommendation; your project needs should come from actual load data, operating plans, and engineering review.

Start with the project requirements

A stacker crane is one part of an automated storage and retrieval system, or AS/RS. It travels along an aisle to store and retrieve loads from rack locations, working with equipment such as conveyors, transfer cars, controls, and warehouse software. Because the crane operates within a defined structure and process, selecting it requires coordination between storage design and material handling requirements.

Document loads, layout, and operating demand

Collect the information a manufacturer will need to assess the application. Record the dimensions and weight of each load type, pallet or container condition, storage location plan, aisle length, rack height, and available building clearances. Include expected operating hours, peak and average movements, inbound and outbound patterns, and any constraints on noise, temperature, or access.

• Load: maximum and typical weight, dimensions, center of gravity, and load carrier.
• Building and rack: aisle geometry, clearances, floor conditions, rack interface, and sprinkler or other building constraints.
• Performance: required storage and retrieval movements by hour, shift pattern, and peak period.
• Integration: conveyor interfaces, warehouse management or control systems, and any existing equipment.

Separate confirmed facts from assumptions in the RFQ. If a dimension, movement rate, or future expansion plan is not yet established, label it as provisional and ask suppliers to identify the effect of that uncertainty. This makes proposals easier to compare and reduces the risk of treating different assumptions as equivalent designs.

Evaluate manufacturers in a consistent sequence

1. Confirm application and engineering capability

Ask how the supplier will translate your requirements into a crane and rack design. A capable project team should explain the proposed crane type, load-handling method, aisle arrangement, operating envelope, and interfaces with the rack and material flow. Request a technical proposal that states assumptions, exclusions, and the information still needed before final design.

Check whether the manufacturer can address the specific conditions of your site, rather than presenting a generic equipment description. Discuss the loads and carriers actually used, the available aisle dimensions, and the required storage and retrieval sequence. For a project involving unusual loads, multiple load formats, or restricted building clearances, ask the supplier to explain how those conditions are handled and what validation is required.

2. Review performance claims and calculations

Ask each bidder to define how it calculates throughput and what operating assumptions are included. A quoted number of moves per hour is meaningful only when the movement definition, travel distances, load profile, transfer times, and system interfaces are clear. Request a calculation or simulation basis where appropriate, and distinguish modeled performance from measured performance on an existing installation.

Compare the proposed rated load, travel and lifting parameters, positioning approach, and duty assumptions against your specification. Ask what happens during peak demand and how the design responds to downtime or blocked interfaces. Do not assume that a faster crane alone will increase system throughput if conveyors, software, or other processes limit the flow.

3. Check integration and controls

Clarify which party supplies and integrates the crane controls, warehouse control system, warehouse management connection, safety devices, and communication interfaces. Request a responsibility matrix that identifies who designs, programs, tests, and supports each component. This is especially important when the project includes equipment from more than one supplier.

Ask how commissioning and acceptance will be managed, including the test conditions and documents required for sign-off. Agree on how faults will be reported, what diagnostic information is available, and how software changes are handled. Confirm that integration responsibilities are included in the commercial proposal rather than left as an unresolved assumption.

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4. Assess manufacturing, quality, and customization

Review the manufacturer’s production process, inspection documentation, project engineering workflow, and ability to provide drawings and operating manuals. Ask for relevant examples of comparable equipment or project types, while checking that any references are appropriate to your load, layout, and operating conditions. A product brochure alone cannot establish whether a supplier has the capacity and process control your project requires.

If customization is needed, identify what is standard and what is project-specific. Ask how changes affect design approval, procurement, testing, delivery, and spare parts. Seek written confirmation of the final scope and technical deviations before placing an order.

5. Compare service and lifecycle support

Discuss installation support, commissioning, operator training, maintenance documentation, spare parts, and troubleshooting arrangements. Ask where service personnel and commonly needed parts are located, what response arrangements are offered, and which tasks your own team must perform. Availability and response terms should be stated in the proposal or service agreement, not inferred from general marketing language.

Also consider maintainability during the design stage. Ask about access to service points, inspection routines, recommended spare parts, and the process for planned maintenance. A low initial quote may not represent the best value if support scope, replacement parts, or integration work is unclear.

Key decision points when comparing quotes

Use a common comparison sheet so that every manufacturer responds to the same requirements. Separate technical compliance from commercial terms, and record assumptions beside each score. If a supplier proposes an alternative, evaluate it as a clearly identified option rather than comparing it as though it were identical to the requested design.

Common mistakes to avoid

• Choosing by purchase price alone: Compare the complete scope, including engineering, integration, installation, commissioning, and service.
• Using an average throughput figure: Specify peak demand and operating patterns, then ask how the proposal addresses them.
• Leaving interfaces undefined: Identify responsibility for software, conveyors, rack coordination, and acceptance testing.
• Approving a design with incomplete load data: Verify the actual load envelope and carrier details before final engineering.
• Ignoring future operating changes: Discuss likely changes in product mix, operating hours, and storage needs, but avoid paying for capacity that has no defined business case.

These issues are often preventable with an early technical workshop involving operations, engineering, IT, procurement, and the selected supplier. Ask the team to review the same layout and requirement set together. Record open questions and assign an owner and due date to each one before the design is finalized.

How HEGERLS can support your evaluation

As a supplier in the stacking racks and shelves sector, HEGERLS can discuss how storage equipment and automated handling requirements should be coordinated for an AS/RS project. Share your load data, site layout, throughput targets, and integration requirements so the project team can understand the application and identify information needed for a proposal. Final configuration and performance should be confirmed through project-specific engineering, not assumed from a general product description.

When requesting a quotation, include the target project schedule, required supply scope, installation expectations, and any preferred control or software interfaces. Ask for a clear list of inclusions, exclusions, assumptions, and customer responsibilities. This creates a practical basis for comparing HEGERLS with other manufacturers and deciding whether the proposed solution fits your operating and procurement requirements.

Conclusion: choose the manufacturer that fits the whole system

The right stacker crane manufacturer is the one that can demonstrate a credible fit between your loads, rack layout, throughput needs, controls, delivery scope, and ongoing support. Start with accurate operating data, request comparable technical proposals, and verify performance assumptions and integration responsibilities before comparing price. Then confirm service terms and acceptance criteria in writing.

Your next step is to prepare a project brief with load dimensions and weights, aisle and rack information, peak movement requirements, system interfaces, and site constraints. Send the same brief to shortlisted suppliers and ask each to respond with a technical concept, assumptions, scope, and open questions. This gives your team a clearer, evidence-based way to select an AS/RS partner and move toward detailed engineering.