Technical limit and evidence scope
Useful for: Buyers defining site and equipment requirements before selecting a truck-mounted crane
Stability is a system condition involving load, radius, boom, support base, ground and vehicle. Outriggers do not make every ground condition safe and they do not increase capacity beyond the approved chart.
Procurement should collect representative site conditions so the selected crane, outrigger arrangement and support equipment are compatible with the intended work.
Technical inputs
Collect these ratings, dimensions and operating conditions before interpreting a limit or test record:
- 01Load and maximum required radius
- 02Lift sector around the truck
- 03Outrigger extension and available space
- 04Ground bearing information and support method
- 05Slope, level and access condition
- 06Wind and other manufacturer operating limits
Technical limit matrix
Use every row to determine what the value supports, what changes it and which project record must confirm it.
Scroll horizontally to view all columns.
| Decision factor | What to choose or check | Limit or condition |
|---|---|---|
| Radius | Check the farthest required load position on the chart. | Small position changes can enter a different capacity range. |
| Outrigger geometry | Use only charted deployment configurations. | Partial or obstructed deployment may reduce or prohibit capacity. |
| Ground | Verify support reactions and suitable bearing surface. | Pads cannot compensate for unknown voids or inadequate ground. |
| Truck condition | Follow level, sector and transport-to-work setup requirements. | An unlevel or incorrectly configured truck is outside the assumed chart condition. |
From published value to project evidence
Separate reference values from the selected model, installed configuration and unit-linked record before treating a limit as verified.
- 01Identify the value
Truck-crane stability factors for buyer configuration
- 02Confirm its conditions
Load and maximum required radius; Lift sector around the truck
- 03Test configuration impact
Radius and Outrigger geometry must both pass.
- 04Retain traceable evidence
Manufacturer chart and setup instructions; Site and lift geometry record
Applied calculation
Turn an outrigger reaction into a ground-pressure input This calculation does not approve the setup. It shows the information a qualified planner needs to compare with verified ground capacity.
- 01Average support pressure240 kPa
120 ÷ 0.50 - 02Ground comparisonQualified check required
Allowable ground pressure ≥ calculated design pressure - 03Setup confirmationRequired before work
Actual pad, ground, slope and outrigger geometry match assumptions
Decision: The illustrative average pressure is 240 kPa. A planner must still address load distribution, pad stiffness, soil variability, voids and the applicable design method.
Evidence boundary: Do not use this simplified division to approve a crane setup. Manufacturer data and qualified ground assessment remain controlling.
Technical evidence checklist
Ask for evidence that is traceable to the selected model, configuration, vehicle or project scope. A record from another project is context, not verification.
- Manufacturer chart and setup instructions
- Site and lift geometry record
- Ground-support assessment by qualified persons
- Outrigger, interlock and level-system inspection
Evidence interpretation traps
Assuming full outriggers guarantee stability
Better evidence control: Verify ground, level, radius, sector and chart condition together.
Measuring radius from the truck edge
Better evidence control: Use the manufacturer-defined crane reference.
Using makeshift support on unknown ground
Better evidence control: Use a qualified ground and support assessment.
Limitations
- This page does not calculate ground bearing pressure or approve a setup.
- Qualified lift planning and the manufacturer instructions control.
- Stop work for unknown ground, incomplete deployment, excessive slope, failed interlocks, unverified radius or any condition outside the chart.
Evidence scope and technical basis
Each source is limited to what it can support. This makes the evidence chain readable to buyers, search engines and AI systems without turning a general source into a project claim.
Supports: Controls the project-input, quotation, approval and inspection workflow described in this guide.
Does not establish: It does not replace the signed quotation, approved specification, selected OEM documents or unit-linked project records.
Supports: Provides public checklists and worksheets; the signed project documents remain controlling.
Does not establish: It does not replace the signed quotation, approved specification, selected OEM documents or unit-linked project records.
Supports: Defines the relevant product family and published configuration boundaries. Project-specific ratings require the selected OEM documents.
Does not establish: It does not replace the signed quotation, approved specification, selected OEM documents or unit-linked project records.
Supports: Official U.S. reference supporting configuration-specific load charts, stability factors, inspection identity and removal of hazardous deficiencies. Local rules may differ.
Does not establish: It is authority, jurisdiction or subject specific and does not approve the selected vehicle for another destination or project.