NCCCO Mobile Crane Assembly and Disassembly 2 — Questions and Answers
Question 1: Who must be present during the assembly and disassembly of a crane?
- Only the crane operator
- A qualified and competent person who directs the operation (Correct answer)
- Any available workers
- Only the equipment rental company representative
Correct answer: A qualified and competent person who directs the operation
OSHA requires a competent and qualified person to direct crane assembly/disassembly operations. This person must understand the manufacturer's procedures and potential hazards.
Question 2: Before assembling a crane on-site, what must be reviewed?
- Only the manufacturer's brochure
- The manufacturer's assembly procedures, ground conditions, weather forecast, and site-specific hazards (Correct answer)
- Just the load chart
- The crane's paint condition
Correct answer: The manufacturer's assembly procedures, ground conditions, weather forecast, and site-specific hazards
Pre-assembly planning includes reviewing manufacturer procedures, assessing ground conditions and slope, checking weather, identifying overhead hazards, and planning the sequence of operations.
Question 3: What is the most common cause of accidents during crane assembly?
- Paint fumes
- Uncontrolled movement of components due to improper support, rigging, or pin placement (Correct answer)
- Loud noise
- Paperwork errors
Correct answer: Uncontrolled movement of components due to improper support, rigging, or pin placement
The most frequent assembly/disassembly accidents involve boom sections, counterweights, or other heavy components moving unexpectedly due to improper support, rigging failures, or missing/incorrect pins.
Question 4: When assembling boom sections, what must be verified before releasing the support crane?
- That the boom section looks straight
- That all connection pins are fully inserted, secured, and verified, and the section is stable (Correct answer)
- That the paint matches between sections
- That the serial numbers are consecutive
Correct answer: That all connection pins are fully inserted, secured, and verified, and the section is stable
Every connection pin must be fully seated, locked, and visually verified before the assisting crane releases the boom section. Missing or improperly installed pins can cause catastrophic failure.
Question 5: What role does wind play in crane assembly operations?
- Wind has no effect on assembly
- Wind can destabilize partially assembled components, create sail effects on boom sections, and push suspended loads during pin-up (Correct answer)
- Wind only matters once the crane is fully assembled
- Wind helps cool the workers
Correct answer: Wind can destabilize partially assembled components, create sail effects on boom sections, and push suspended loads during pin-up
During assembly, partially connected components are especially vulnerable to wind. Boom sections being lifted have large sail areas, and wind can prevent precise alignment for pin connections.
Question 6: What ground preparation is required before assembling a crane?
- No preparation needed on paved surfaces
- The ground must be evaluated for bearing capacity, leveled if necessary, and prepared with adequate support (mats, pads) for outriggers or tracks (Correct answer)
- Just remove visible debris
- Only prepare the area where the boom will rest
Correct answer: The ground must be evaluated for bearing capacity, leveled if necessary, and prepared with adequate support (mats, pads) for outriggers or tracks
Ground must support the crane's maximum loads during assembly AND operation. This may require compaction testing, grading, cribbing, or mats. Failure to prepare adequately can cause sinking or collapse during assembly.
NCCCO Mobile Crane Assembly and Disassembly 2
Who must be present during the assembly and disassembly of a crane?