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

Choose a stacker crane manufacturer by evaluating its ability to engineer for your load, storage layout, throughput, controls, safety requirements, and long-term service needs—not by comparing machine prices alone. Before requesting quotations, prepare a project brief with your unit-load details, operating profile, aisle and building constraints, and expected system interfaces. Then compare suppliers against the same requirements and ask each to explain its assumptions, exclusions, and commissioning plan. This process helps you select a partner capable of supporting the complete AS/RS project, rather than simply supplying a crane.

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Start with the AS/RS problem you need to solve

A stacker crane operates within a storage aisle, retrieving and placing loads at rack locations as part of an automated storage and retrieval system. Its suitability depends on how the crane, racks, load-handling equipment, controls, and warehouse software work together. A specification that looks adequate on paper may not meet your needs if it overlooks the actual load, travel pattern, building conditions, or interface with upstream and downstream equipment. Define the operating problem first so manufacturers can quote against a shared project scope.

For example, a facility with limited floor space may prioritize storage density, while a distribution operation may focus on retrieval sequences and peak-hour throughput. A production facility may need the AS/RS to coordinate with conveyors, production schedules, or other material-handling equipment. These priorities affect both the crane design and the wider system configuration.

Step 1: Prepare an accurate project brief

Document load and operating requirements

Record the dimensions, weight, base condition, and stability of every load type the crane will handle. Include pallet or container variations, overhang, packaging, and any restrictions on how the load can be supported. Share representative drawings or samples when possible, because the load interface influences the crane’s handling device and rack design.

Describe the operation across a typical day, including inbound and outbound flows, peak periods, shift patterns, and expected changes in demand. Be precise about what you mean by a move: a single storage or retrieval task may be counted differently from a combined cycle. If you have historical transaction data, provide it so suppliers can model demand rather than rely on a broad average.

Share site and building constraints

Provide available building drawings, rack layout concepts, floor information, clear height, aisle widths, and details of any obstructions or operating restrictions. Ask the manufacturer to identify which site details still need verification before final engineering. The crane and rack should be considered together, since the layout, clearances, and load positions influence system design.

Use project figures as design inputs, not as proof that a particular solution will work. For example, a proposed aisle height of 18 m is a project-specific requirement that the supplier must evaluate against the building, crane design, rack, and applicable engineering criteria. It is not a universal recommended height. Give all bidders the same drawing revision and assumptions so their proposals can be compared fairly.

Step 2: Evaluate technical fit and performance evidence

Check capacity, handling, and throughput assumptions

Ask how the proposed crane matches your load envelope, rack locations, travel paths, and required storage and retrieval tasks. Request a clear explanation of the calculation method and operating assumptions behind any quoted throughput. A proposal should specify whether its figures depend on task distribution, simultaneous movements, acceleration settings, or other system conditions.

For a useful comparison, you might define an illustrative requirement of 60 pallet moves per hour during a stated peak period. Treat that number as your project target, not a general industry benchmark or a guaranteed result. Ask each manufacturer to state what is included in its calculation and whether the wider system—such as conveyors, lifts, or software—could limit performance.

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Review safety, controls, and integration

Ask the supplier to describe its safety concept, operating modes, protective devices, and the information it needs to verify the design. Confirm which party is responsible for crane controls, warehouse management or control software, network connections, and interfaces to other equipment. Clarify how alarms, fault recovery, and maintenance access are handled.

Do not treat a general statement of compliance as a substitute for project documentation. Request the applicable standards and technical documents relevant to your site and scope, and have your engineering or safety team review them. Also confirm how design changes are approved and recorded so the installed system can be checked against the agreed specification.

Step 3: Assess the manufacturer’s project support

A suitable stacker crane manufacturer should be able to explain how its work fits into the full project timeline, from technical clarification through manufacturing, installation coordination, commissioning, and handover. Ask who will be your technical contact and which responsibilities remain with your integrator, installer, or internal team. If the supplier offers rack or shelving solutions as well as cranes, clarify whether the scope is engineered as one coordinated system or supplied as separate packages.

Discuss documentation, operator training, maintenance instructions, spare-parts recommendations, and the process for requesting technical support. If you have a required response time or operating availability target, state it as a contractual requirement for review. For instance, a buyer might ask suppliers to assess a proposed 99.5% availability target; this is an example of a buyer-defined target, not a performance promise. Define how availability would be measured, what downtime is excluded, and what service obligations would support the target.

Step 4: Compare quotations on a like-for-like basis

Build a comparison matrix that separates included equipment from optional items and customer responsibilities. Compare the crane configuration, rack scope, load-handling device, controls, software interfaces, installation support, commissioning, training, documentation, warranty terms, and service options. A lower initial quotation may exclude work that another supplier has included, so normalize the scope before comparing prices.

Request a schedule with the milestones and dependencies that affect delivery. Ask what information, approvals, or site readiness conditions the manufacturer needs from you, and how delays or design changes are managed. Avoid assuming that quoted lead times are directly comparable unless the scope, approval dates, and delivery terms are aligned.

Common mistakes to avoid

• Choosing on purchase price alone: Compare total scope, service obligations, and project responsibilities, not just the crane line item.
• Providing incomplete load data: Missing dimensions or load variations can lead to design revisions and interface problems.
• Using a single average throughput figure: Share peak patterns and task definitions so suppliers can explain how they calculated performance.
• Leaving integration until late in the project: Confirm controls, software, and equipment interfaces during technical evaluation.
• Accepting undefined performance targets: Agree on measurement methods, conditions, responsibilities, and exclusions before making targets contractual.

Key takeaways for selecting a supplier

• Prepare a consistent project brief covering loads, operating patterns, building constraints, and interfaces.
• Ask manufacturers to explain the assumptions behind capacity and throughput proposals.
• Review safety documentation, controls, installation coordination, commissioning, and after-sales support.
• Compare quotations only after aligning scope, exclusions, responsibilities, and delivery assumptions.
• Make project-specific targets measurable and contractually clear; do not treat illustrative figures as guarantees.

Conclusion: Choose a partner that can validate the whole project

The right stacker crane manufacturer is the one that can demonstrate technical fit for your loads and building, explain its performance assumptions, define system interfaces, and support the agreed scope through delivery and handover. Start by documenting your requirements, then use a common evaluation matrix to compare technical proposals and commercial terms. Before placing an order, resolve open engineering questions, confirm responsibilities, and agree how performance and service commitments will be measured.

At HEGERLS, we work with buyers evaluating stacking racks, shelves, and AS/RS project requirements. Share your preliminary layout, load specifications, and operating goals with our team to discuss a suitable solution and identify the information needed for a detailed proposal.