CDL - Chapter 18: Identification and Diagnosis of Malfunctions

The lubrication system lubricates, cools, and cleans the:

• exhaust.

• drive train.

• engine.

• all of the above.

The __________ is a series of connected mechanical parts which take the power generated by the engine and applies it to the tractor’s drive wheels.

• clutch

• drive train

• kingpin

• all of the above

A defect in the braking system can interfere with a vehicle’s ability to:

• steer properly.

• accelerate.

• slow down or stop.

• Shift into gear.

This system is what connects the tractor and trailer.

• Transmission system

• Coupling system

• Kingpin system

• Suspension system

When looking over the suspension system, you need to check for cracked, loose, or:

• broken spring hangers.

• damaged torque rods.

• damaged U-bolts.

• all of the above.

If your exhaust temperature is too high, what can get damaged?

• Engine

• Aftercooler

• Turbocharger

• Both A and C

When checking the coupling system, you need to:

• check the fifth wheel for cracks, breaks, security, and grease.

• check the kingpin for excessive cracks, bending, or wear.

• check the differential for loose wire connections.

• A & B

The suspension system allows the axles to move up and down in response to ground changes without seriously affecting the load. (a)   allows the stress of road shocks to be distributed evenly throughout the frame.

• Driving at 55 mph

• Securing the suspension system at points spread throughout the frame

• Securing the suspension points directly above each set of wheels

• A & B

To keep vehicle systems in good operating condition:

• pay attention to your senses; sights, sounds, smells, and/or the feel of the vehicle can indicate a potential problem.

• report vehicle defects and deficiencies that you cannot fix to your company.

• make sure you only schedule maintenance work when there’s a problem with your vehicle.

• A & B

As part of an oil change, the condition of the (a)   should be assessed. This item can help prolong the life of the engine by removing contaminants as oil passes through it.

• filter

• dipstick

• oil

• cap