Select working radius from the crane's load chart using the exact boom configuration, counterweight arrangement and lift height that will be supplied. Capacity varies continuously with radius; verify that the chart matches the proposed equipment state and ground conditions. Request configuration-specific charts, engineered ground-support information and written confirmation of any travel-under-load conditions.
Shown as a configuration reference. Availability and the equipment offered for your project are confirmed separately.
Match chart conditions to the supplied configuration
Working radius selection requires the load chart for the exact boom length, jib type, counterweight arrangement and reeving that the supplier will provide. Capacity changes continuously as radius increases. A crawler crane rated at a certain capacity close to its center of rotation delivers a much lower capacity at extended reach. Request the complete chart for the proposed configuration rather than selecting radius from a different boom or ballast state.
Define lift geometry before comparing charts
Provide the total suspended mass including the load, rigging, hooks and any below-hook devices. Specify the horizontal distance from the crane’s center of rotation to the load’s center of gravity at the pickup point and at the final placement position. Include the required hook height above ground or the supporting surface. If the load will travel between positions, describe the path and identify the maximum radius along that route. These parameters determine which chart entries are relevant and whether the planned operation is permitted.
Avoid mixing capacities from different configurations
Load charts are configuration-specific. One chart applies to a particular boom length and counterweight; a different chart governs a longer boom or additional ballast. Do not combine the maximum reach from one chart with the maximum capacity from another. For a project requiring multiple boom arrangements, request charts for each state and confirm that the supplied components support every planned configuration. Verify whether the quotation includes all jib sections, connecting pieces and ballast masses needed for the required chart conditions.
Consider ground support in the radius decision
Ground reactions vary with load position and boom angle. A lift near the machine’s maximum radius imposes different forces on the supporting surface than a lift at close radius. The ground assessment must address the planned working positions and the corresponding crane reactions. Provide geotechnical information and an engineered mat or support design. Clarify whether the ground-support scope in the quotation covers all intended radii or requires separate analysis for extended-reach operations.
Confirm travel-under-load permissions
Moving with a suspended load is governed by specific chart conditions and manufacturer instructions. Not every radius that appears on a stationary lift chart is permitted during travel. Ground levelness, route width and load orientation also matter. If the project requires the crane to travel while carrying a load, request the applicable travel chart and confirm that the planned radius, load and route comply with the stated limits. Obtain written confirmation of the approved travel conditions rather than assuming general crawler mobility permits any movement.
Request stepless load moment calculation
Some control systems calculate load moment continuously rather than in fixed radius increments. The Liebherr LR 1300.1 SX control system performs stepless calculation of load moment indication [S1], which can provide more precise capacity information across the working range. Confirm whether the offered crane provides interpolated values or requires the operator to reference discrete chart points.
Buyer inputs for radius and chart selection
| Input category | Required information | Evidence to request |
|---|---|---|
| Load definition | Total suspended mass including rigging; load center of gravity; pickup and placement coordinates | Rigging design; hook block and auxiliary lifting gear specifications |
| Boom and counterweight | Proposed boom length; jib type and length if applicable; counterweight arrangement; reeving configuration | Configuration-specific load chart; component list confirming supplied boom sections and ballast masses |
| Lift height | Required hook height above ground or supporting surface at pickup and placement; vertical clearance over obstacles | Chart covering the required height range for the proposed boom configuration |
| Working radius | Horizontal distance from crane center of rotation to load center of gravity at each critical position; path between positions | Chart entries at relevant radii; confirmation that all planned radii are within the configuration’s range |
| Ground support | Bearing capacity; settlement limits; mat or support design; crane reactions at planned working positions | Engineered ground-support plan; crane reaction data for the proposed configuration and load cases |
| Travel under load | Intended travel distance, direction and speed; load orientation; route levelness and width | Travel-under-load chart; manufacturer instructions for the proposed operation; written approval of travel conditions |
Compare what the quotation includes
Verify that the commercial scope includes the boom components, jib hardware and counterweight masses required to achieve the charts provided. Obtain shipping dimensions and individual component weights for transport planning. Confirm whether the supplier provides auxiliary lifting equipment and area for crane erection, or whether those resources remain the buyer’s responsibility. Request inspection records, operator training for the specific configuration and arrangements for accessing load charts and technical support after delivery.
Treat configuration changes as engineering projects
Customization affecting boom design, control logic or load-limiting functions requires a defined engineering process and updated documentation. Submit the complete lift cases and any jurisdiction-specific requirements. The supplier must confirm feasibility, provide configuration-specific charts and clarify who holds responsibility for the customized arrangement’s compliance and performance. Branding or labeling alone does not change lifting capacity or chart applicability.
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Define your equipment requirements
Review the Crawler crane buying guide for the complete equipment scope.
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Frequently asked questions
Does maximum crane capacity determine suitable working radius?
No. Capacity decreases as radius increases. Provide the total suspended mass and the required horizontal distance from the crane's center of rotation. Compare that combination against the chart for the exact boom, jib and counterweight configuration the supplier will provide, rather than selecting based on the crane's maximum rated capacity at minimum radius.
Can I combine the longest reach and highest capacity from different charts?
No. Each chart applies to a specific boom length, jib arrangement and counterweight state. Request charts for every configuration needed in your project. Verify that the quotation includes all components required to achieve the planned boom and ballast states, and confirm changeover procedures if multiple configurations are necessary.
What lift information is needed to select working radius?
Provide total suspended mass including rigging, horizontal distance from crane center of rotation to load center of gravity, required hook height, and the path between pickup and placement. Include any planned travel under load. These parameters determine which chart entries apply and whether the intended operation is permitted by the manufacturer's instructions.
How does ground support affect radius selection?
Crane reactions vary with boom angle and load position. A lift at extended radius imposes different forces than one near the machine. Supply geotechnical data and an engineered support design that addresses the planned working positions. Clarify whether the ground-support scope covers all intended radii or requires separate analysis for different lift locations.
Which chart applies when the crane travels with a load?
Travel under load is governed by a separate chart and specific manufacturer instructions. Not every stationary-lift radius is permitted during movement. Request the travel chart, confirm that your planned route, load and radius comply with stated limits, and obtain written approval of the travel conditions rather than assuming crawler mobility permits any movement.
What documentation should accompany the selected configuration?
Request the load chart for the exact boom, jib and counterweight arrangement supplied, component identification, inspection records, and operation instructions. Include training for the agreed configuration and arrangements for technical support. Verify that the chart matches the proposed equipment state and any destination-specific requirements.
Reference information
- LR 1300.1 SX Crawler crane - Liebherr
Reference data and images explain equipment configurations. IndustryApex engineers confirm the offered model, specification and commercial scope in your project quotation.