Service Truck Crane Operator Flashcards

A service truck crane has a rated capacity of 8,000 lbs at a 10-foot radius. The operator needs to lift a 5,500 lb load at a 14-foot radius. The load chart shows 6,200 lbs at 14 feet. Which statement is MOST accurate regarding this lift?

Answer: The lift requires a documented lift plan because the load exceeds 75% of the rated chart capacity at that radius.

ASME B30.22 and OSHA 1910.180 require that lifts exceeding 75% of a crane's rated capacity at the working radius must have a documented lift plan. 5,500 ÷ 6,200 = 88.7%, which clearly exceeds the 75% threshold, triggering additional planning and supervisory requirements regardless of whether the load is technically within the rated chart capacity.

During a pre-operation inspection, a service truck crane operator notices that one outrigger pad has a crack running 60% across its width. The pad is 18 inches square and 3 inches thick. What is the CORRECT course of action?

Answer: The pad must be taken out of service immediately and tagged; the crane cannot be operated until a replacement pad is available.

A cracked outrigger pad represents a critical structural deficiency that compromises ground bearing capacity in an unpredictable manner. ASME B30.22 requires that defective components be taken out of service and tagged 'Do Not Use.' There is no provision for reduced-capacity operation with a damaged outrigger pad — cracks propagate under load and pad failure can cause sudden crane tip-over. The crane must not operate until the pad is replaced.

A service truck crane operator is working near a 345 kV overhead power line. The employer has not obtained an electrical line voltage determination. Under OSHA 1910.333 and ASME B30.22, what minimum clearance must the operator maintain?

Answer: 20 feet, the default clearance when voltage is unknown or cannot be confirmed.

When the voltage of a power line is unknown or cannot be confirmed by the employer, OSHA 1926.1408 and ASME B30.22 require a default minimum clearance of 20 feet for all crane operations. The 10-foot rule applies only to confirmed voltages up to 50 kV; above 50 kV, clearances increase with voltage. Since 345 kV is a high-voltage transmission line and the voltage has not been confirmed, 20 feet is the mandatory default, not the 10-foot general rule.

A service truck crane operator is performing a tandem lift with a second crane. The combined load is 18,000 lbs. At the point of maximum radius for Crane A, that crane is carrying 11,200 lbs — exactly 93% of its rated chart capacity. What additional requirement is triggered SPECIFICALLY because this is a tandem lift?

Answer: A qualified person must be in charge of the entire operation and a written lift plan is mandatory regardless of individual crane load percentages.

ASME B30.22 and OSHA 1926.1425 impose special requirements for tandem (multiple crane) lifts independent of individual capacity percentages. A qualified person must be designated to direct the entire operation, and a written lift plan is mandatory for all tandem lifts — not only when individual cranes approach capacity thresholds. Additionally, the 93% load on Crane A independently triggers critical lift documentation. The combination of tandem lift requirements and near-capacity loading makes this a doubly-documented, closely supervised operation.

While operating a service truck crane, the operator experiences a sudden hydraulic pressure loss and the load begins to drift downward slowly. The load is suspended 12 feet off the ground with no personnel below. What is the CORRECT immediate action sequence?

Answer: Activate the emergency stop, set the swing brake, and attempt to lower the load to the ground using the emergency lowering valve before shutting down.

Service truck cranes equipped with hydraulic systems are required by ASME B30.22 to have load-holding check valves that prevent uncontrolled drift, and most modern units include an emergency lowering circuit. The correct response to hydraulic pressure loss is to: (1) stop all crane motion, (2) secure swing with the swing brake, and (3) use the emergency lowering valve to bring the load to the ground in a controlled manner before full shutdown. Abandoning the load in a suspended state is never the correct protocol when a controlled descent is achievable. Swinging a load during a hydraulic failure risks loss of control.

A service truck crane's load chart specifies capacities for 'over rear' and 'over side' configurations. The operator is facing a 180-degree arc that straddles the rear/side boundary. The required pick point falls at exactly 45 degrees off the centerline of the vehicle. Which capacity value should the operator apply?

Answer: The operator must use the lesser (over-side) capacity for any lift not clearly within the over-rear arc as defined by the manufacturer's load chart.

Load chart capacity zones for 'over rear' and 'over side' are defined by the manufacturer and are not subject to field interpolation. The over-rear arc is explicitly bounded in the load chart (commonly ±30 or ±45 degrees from centerline depending on the unit). When the lift point falls at a boundary or in an ambiguous zone, ASME B30.22 requires using the most conservative (lowest) applicable capacity — which is the over-side rating. Interpolating between zones is never permitted unless the manufacturer's load chart explicitly provides an interpolation table. Using over-rear capacity outside its defined arc risks exceeding actual structural and stability limits.