NCCCO Service Truck Crane Operator 4

Question 1

What is the maximum rated capacity for most service truck cranes (knuckle boom or telescopic)?

Accepted Answer

Typically 3-14 tons depending on configuration, much less than mobile cranes

Answer

Service truck cranes (also called boom trucks or knuckle booms) typically have capacities between 3-14 tons, making them suitable for lighter lifts like HVAC units, construction materials, and utility work.

Question 2

What is unique about the outrigger requirements for service truck cranes?

Accepted Answer

Outriggers must be fully extended AND the truck must be on firm, level ground — partial extension drastically reduces capacity

Answer

Service truck crane load charts often show dramatically different capacities for full vs. partial outrigger extension. Operating with partially extended outriggers without the correct chart can lead to tip-over.

Question 3

When operating a service truck crane near the rear of the truck, what special consideration applies?

Accepted Answer

Capacity over the rear may be different from over the side due to the truck's stability geometry

Answer

Service truck cranes have different stability characteristics in different quadrants. Operating over the rear, side, and front each have different rated capacities based on the truck's outrigger configuration and center of gravity.

Question 4

What CDL requirement may apply to service truck crane operators?

Accepted Answer

Depending on truck GVWR, a CDL may be required to drive the truck on public roads

Answer

Service trucks exceeding 26,000 lbs GVWR require a CDL to operate on public roads. This is separate from the crane operator certification — both may be needed.

Question 5

What is the most common cause of service truck crane accidents?

Accepted Answer

Overloading beyond rated capacity, often due to using incorrect load chart or not accounting for outrigger configuration

Answer

The most common cause is exceeding capacity, frequently because operators use the wrong section of the load chart (wrong outrigger configuration) or don't account for rigging weight and dynamic loads.

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO Service Truck Crane Operator 4