Mobile Crane Assembly and Disassembly Flashcards
6 cards from real NCCCO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Mobile Crane Assembly and Disassembly flashcards as text
What is the function of outrigger float pads during mobile crane setup?
Answer: To distribute outrigger point loads over a larger area to reduce ground bearing pressure
Outrigger float pads spread the concentrated point load from outrigger cylinders over a larger surface area, reducing the pressure applied to the ground to within safe bearing capacity limits.
What is the significance of the load chart reference to 'on outriggers, fully extended' versus 'on tires'?
Answer: Outrigger configurations provide significantly higher rated capacities than on-tire configurations
Fully extended outriggers provide a much wider and more stable base, enabling significantly higher load capacities compared to the reduced capacities permitted when operating on tires.
Before pinning boom sections together during assembly, what must be verified at each connection?
Answer: That chord holes are aligned and pins can be inserted without forcing
Proper pin hole alignment must be verified before insertion to ensure pins are not forced into misaligned holes, which could create structural stress concentrations or prevent full engagement.
Who is responsible for coordinating and supervising mobile crane assembly and disassembly operations?
Answer: A qualified and competent person designated by the employer
OSHA 29 CFR 1926.1403 requires that assembly and disassembly be directed by a qualified and competent person who understands the equipment and can identify hazards.
What is the correct procedure when a pin is difficult to drive during crane assembly?
Answer: Stop assembly, identify the cause of misalignment, and correct before proceeding
Difficulty driving pins indicates misalignment or a defective component; forcing pins can damage structural components and the assembly must stop to identify and correct the root cause.
When disassembling a crane in a confined area, what is the most critical planning consideration?
Answer: Ensuring adequate clearance for boom and component lowering without striking obstacles
Confined area disassembly requires careful planning to ensure boom sections and components can be safely lowered without contacting overhead obstructions, adjacent structures, or utilities.