Stop work without trying to reproduce the unstable condition
An unstable support or uncontrolled movement requires the manufacturer’s emergency and recovery plan with qualified assistance. Do not keep cycling the boom for diagnosis, and do not assume that lowering, moving or stowing is safe during the fault.
Apparent instability may originate at the ground, pad, outrigger or chassis rather than inside the boom. A warning or blocked movement may be the safety logic responding correctly. Record the setup, load, boom position and alarms from a safe location.
Keep support conditions and hydraulic symptoms in the same report
A hydraulic adjustment cannot fix inadequate ground support. Qualified technicians need the installed diagnostic method to assess controls, leaks, heat, noise and drift without bypassing interlocks or exposing personnel beneath an unsupported boom.
Scroll horizontally to view all columns.
| Decision | What to establish | Condition or limit |
|---|---|---|
| Safe recovery | Stop work and follow the manufacturer’s emergency plan with qualified assistance. | Do not assume that moving, lowering or stowing is safe during an unstable condition. |
| Setup condition | Check ground, pads, level, brakes, chocks and outriggers. | A hydraulic adjustment cannot correct inadequate ground support. |
| Control logic | Record faults, sensors and interlocks without bypass. | Defeating safety logic can create uncontrolled movement. |
| Hydraulic condition | Inspect qualified service points for fluid, leaks, heat, noise and drift. | Never search for pinhole leaks by hand or work under an unsupported boom. |
Send the fault context to qualified aerial-equipment service
Preserve observations and any preceding changes without repeating the hazard. Keep the unit out of service for unstable support, structural damage, uncontrolled motion, failed protections or missing required inspection status until the responsible parties establish the recovery and service path.
Information to send with the service request
- Exact symptom and time of occurrence
- Ground, pad, slope and outrigger condition
- Boom position, platform load and weather
- Control messages, alarms and interlock states
- Hydraulic level, temperature, leakage and noise
- Recent inspection, damage and repair history
Records to request and keep
- Fault and setup-condition record
- Control-code and interlock-state capture
- Qualified hydraulic and structural inspection
- Repair identity and controlled return-to-service test
Common mistakes and what to check instead
- Assuming every stability warning is a bad sensor: Verify ground, level, pads, outriggers and load first.
- Continuing to cycle a drifting boom: Stop work and use the approved emergency and recovery arrangements.
- Overriding the interlock to move: Use only the approved emergency procedure and diagnose the cause.
Service and safety limits
This page is not a hydraulic repair, emergency rescue or work-at-height procedure.
Qualified aerial-equipment technicians and manufacturer instructions control service.
Remove the unit from service for unstable support, structural damage, uncontrolled movement, leakage, failed interlocks, abnormal heat or missing inspection status.
Sources and applicability
Controls the project-input, quotation, approval and inspection workflow described in this guide.
Provides public checklists and worksheets; the signed project documents remain controlling.
Defines the relevant product family and published configuration boundaries. Project-specific ratings require the selected OEM documents.
Official U.S. reference supporting manufacturer load limits, controls, outriggers, brakes and travel checks. It is not a destination approval or KEEYAK rating.
Official U.S. guidance for worksite assessment, training, inspection, platform load, reach and stabilization. Local rules may differ.