Managing Mobile Crane Hazards

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Construction Safety Council

Summary Statement

A presentation reviewing the major safety risks mobile cranes pose for operators and workers around them and how to reduce those risks. It is designed for site supervisors or safety representatives.

Inspection Requirements for Mobile Cranes

Key Concepts:
  • OSHA requirement concerning mobile crane inspections
  • Crane inspection types
  • Inspection records
  • How to conduct a mobile crane inspection
  • Basic crane inspection component list
OSHA Requirements Concerning Crane Inspections
  • Competent Person needs to do inspection
  • Correct any deficiencies immediately
  • Maintain inspection records

Crane Inspection Types

  • Daily to monthly intervals.
  • Performed at the start of each shift.
  • Focuses on components that may change from day to day.
  • 1 to 12 month intervals.
  • Includes items listed in the daily inspection as well as; structural defects, excessive wear, and hydraulic or air leaks.
Crane Inspection Records
  • Date of Inspection
  • Signature of person conducting inspection
  • Serial number; or other identifier
inspected sticker on crane

Conducting a Mobile Crane Inspection

Consider the following when inspecting cranes:
  • Request for and review all inspection and maintenance documents.
  • Conduct a walk-around.
  • Ask the operator, ground crew (riggers), and/or supervisors appropriate questions.
  • Check crane set up and stability.
  • Pre-Inspection

    • Operator
    • Qualifications
    • Crane Records

  • Crane Setup

    • Leveling
    • Outriggers
    • Stability
    • Structural Integrity

  • Load Charts

    • Availability
    • Correct Use

Crane Inspection Components
  • Manufacturers' manuals
  • Exposed moving parts
  • Swing radius
  • High voltage warning signs
  • Boom stops
  • Jib stops
  • Boom angle indicators
  • Boom hoist disconnects
  • Anti-two blocking device
  • Hydraulic functions
  • Leveling
  • Sheaves
  • Drum lagging and flanges
  • Boom assembly
  • Hooks
  • Hydraulic hoses & fittings
  • Outriggers
  • Load charts
  • Wire rope (running & standing)
  • Operator's compartment
  • Access ladders
Manufacturer's Operating and Maintenance Manuals

Exposed Moving Parts

Swing Radius

High Voltage Warning Signs

danger electroctuion hazard sticker

danger electroctuion hazard sticker

Boom stops

photo of boom stops

Jib stops

photo of jib stops

Boom Angle Indicators

photo of boom angle indicators

Boom Hoist Disconnects

photo of boom hoist disconnects

Anti-Two Block Devices

Photo of 
Anti-Two Block Devices

Hydraulic Functions

Photo of 
Hydraulic Functions

Leveling of the Crane

Leveling of the Crane Photo

Leveling of the Crane Photo


photo of sheaves

photo of sheaves

Drum Lagging and Flanges

Photo of Drum Lagging and Flanges

Components of the Boom Assembly

photo of Components of the Boom Assembly


photo of hook

Hydraulic Hoses & Fittings

photo of hyddraulic hoses and fittings

Outriggers & Beams

photo of outriggers and beams

Load-Rating Chart

photo of load rating chart

Wire Rope

photo of wire rope

Operator's Compartment

photo of operators compartment

danger sticker

Access Ladder

photo of access ladder

Learning Opportunity
  • What are five (5) OSHA requirements concerning the inspection of mobile cranes?
  • What two (2) types of inspections must be performed on all cranes?
  • What three (3) inspection records shall be maintained monthly on critical items in use?
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