NCCCO Service Truck Crane Operator 4 5 — Questions and Answers
Question 1: What is a 'critical lift' as defined by NCCCO standards for service truck cranes?
- Any lift performed after 5:00 PM
- A lift that exceeds 75% of the crane's rated capacity or involves unusual hazards requiring a written plan (Correct answer)
- Any lift where the load weighs more than 500 pounds
- A lift performed without a spotter
Correct answer: A lift that exceeds 75% of the crane's rated capacity or involves unusual hazards requiring a written plan
Critical lifts typically involve loads exceeding 75% of rated capacity or unusual conditions, requiring a pre-lift plan and additional safety measures.
Question 2: Which type of wire rope defect requires the rope to be removed from service immediately?
- One broken wire in a lay length
- Six randomly distributed broken wires in one lay or three broken wires in one strand in a single lay (Correct answer)
- Minor surface oxidation with no pitting
- Slight kinking that can be straightened by hand
Correct answer: Six randomly distributed broken wires in one lay or three broken wires in one strand in a single lay
Per ASME B30.5 and OSHA standards, six randomly distributed broken wires in one lay or three in one strand requires immediate removal from service.
Question 3: A service truck crane's rated capacity is reduced to 85% when operating on outriggers extended to mid-span. What does this reduction account for?
- The weight of the outrigger pads
- Reduced stability compared to fully extended outriggers (Correct answer)
- Increased boom deflection at partial extension
- Decreased hydraulic pressure at partial outrigger extension
Correct answer: Reduced stability compared to fully extended outriggers
Partially extended outriggers provide less lateral stability than fully extended ones, so rated capacity is derated to maintain an adequate safety margin.
Question 4: When using a service truck crane to make a tandem lift with two cranes, who is responsible for directing the combined lift?
- The operator of the crane with the higher rated capacity
- A designated lead operator or lift director who coordinates both cranes (Correct answer)
- The most experienced operator on site
- Each operator independently monitors their own load
Correct answer: A designated lead operator or lift director who coordinates both cranes
Tandem lifts require a designated lift director to coordinate both cranes simultaneously and prevent uneven load distribution or communication failures.
Question 5: What hazard does 'two-blocking' create during a service truck crane operation?
- It locks the slew ring and prevents rotation
- The load block contacts the boom tip, causing wire rope failure or structural damage (Correct answer)
- It prevents the outriggers from retracting after use
- It causes the hydraulic pump to cavitate
Correct answer: The load block contacts the boom tip, causing wire rope failure or structural damage
Two-blocking occurs when the load block contacts the boom tip sheave, putting enormous stress on the wire rope that can cause sudden failure.
Question 6: Which document must a service truck crane operator review to determine if a lift can be made near an excavation?
- The crane manufacturer's color coding guide
- The crane load chart combined with a soil assessment and excavation proximity guidelines (Correct answer)
- The vehicle's tire pressure specifications
- The operator's personal logbook
Correct answer: The crane load chart combined with a soil assessment and excavation proximity guidelines
Lifts near excavations require reviewing load charts alongside soil bearing capacity and proximity guidelines to prevent outrigger sinkage or ground collapse.
Question 7: What is the recommended procedure when a service truck crane operator loses visual contact with the load during a lift?
- Continue the lift using the load moment indicator readings
- Stop all crane movement immediately until a qualified signal person re-establishes contact (Correct answer)
- Slowly lower the load while sounding the horn
- Increase boom height to improve the operator's line of sight
Correct answer: Stop all crane movement immediately until a qualified signal person re-establishes contact
If the operator cannot see the load, all crane motion must stop immediately until a signal person or the operator re-establishes visual contact.
NCCCO Service Truck Crane Operator 4 5
What is a 'critical lift' as defined by NCCCO standards for service truck cranes?