NCCCO Maintenance and Troubleshooting 5

Question 1

What is the correct procedure when a crane's engine oil pressure warning light illuminates during operation?

Accepted Answer

Stop the crane immediately and shut down the engine

Answer

A low oil pressure warning indicates potential imminent engine damage; immediate shutdown prevents catastrophic failure.

Question 2

When testing the anti-two-block (ATB) device, which result confirms the device is functioning correctly?

Accepted Answer

Hoist motion stops before the block contacts the boom head

Answer

A properly functioning ATB device must stop hoist-up motion before the block reaches the boom head sheaves.

Question 3

A crawler crane's track tension is too loose. What operational hazard does this create?

Accepted Answer

Track can derail or de-track during travel or slewing

Answer

Loose track tension allows the track to jump off the rollers and sprockets, causing a de-tracking event that can tip the crane.

Question 4

What does excessive heat on a crane's hydraulic return line filter indicate?

Accepted Answer

A clogged filter element restricting flow

Answer

A blocked return filter causes fluid to back up and heat to build as pressure drop across the clogged element increases.

Question 5

A technician finds corrosion pitting on the inner surface of a wire rope. What caused this condition?

Accepted Answer

Internal moisture ingress from inadequate lubrication

Answer

Internal corrosion pitting results from moisture penetrating the rope's core when internal lubrication is absent or depleted.

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