Drive Train

A vehicle with a lot of driveline vibration could have:

Uneven working angles

No working angles

Parallel working angles

Even working angles

Correct! Wrong!

The two methods of drive line alignment are the parallel method and:

Intersecting line method

Vertical line method

Constant velocity method

Horizontal method

Correct! Wrong!

Before beginning any service or repair to a drive system:

Always allow it to cool

Drain all fluids

Lock out or tag out the equipment

Read the operators request for service

Correct! Wrong!

The prime function of a drive line is to:

Provide extra unsprung weight for the equipment

Transmit torque at a uniform speed

Allow an increase in the distance between units

Provide a method of connecting power take-off units

Correct! Wrong!

The main drawback of using a single cross universal joint applied to a driveshaft system is that:

The universal joint changes torque requirements

The universal joint requires constant lubrication

The drive shaft sections are too long

The universal joint does not transfer uniform rotating speed

Correct! Wrong!

Propeller shafts must be as short as possible and as large in diameter as possible to:

Transmit torque without bending or vibrating

Eliminate oscillation

Increase support through bearing units

Make disassembly easier

Correct! Wrong!

The two most significant factors in reducing driveline failure is:

Regular maintenance and careful use

Frequent parts replacements and proper loading

Proper lubrication and correct alignment

Operator training and frequent inspection

Correct! Wrong!

To check a two-joint assembly for alignment, you must perform dial indicator tests at three different locations on:

The transmission output flange

The carrier flange

The wheel hubs

The propeller shaft

Correct! Wrong!

What should a technician do when replacing a support bearing assembly?

Lubricate the bearing

Apply lubricant to the outer bearing race to help press the bearing into place

Coat the bearing seal surfaces with grease

Pay close attention to proper orientation of the support bearing assembly

Correct! Wrong!

A transfer case with an air actuator will not shift from the low gear ratio up to 1:1. The most likely first check is:

A broken shifter shaft spring

A faulty air compressor

Supply air line pressure

A broken shifter shaft

Correct! Wrong!

A truck has non-functional speedometer while the odometer operates correctly. The LEAST likely cause of the problem would be:

A broken road speed sensor

Loose wiring at the instrument cluster

A broken speedometer gauge

An open circuit in the wiring behind the instrument cluster

Correct! Wrong!

A technician finds dirt contamination when removing the 4X4 axle end-locking hub. What should the technician do?

Replace the entire hub

Replace the bearings and repack the hub

Repack the bearings

Inspect and repack the bearings and replace the seal

Correct! Wrong!

The following are all acceptable steps to prepare the vehicle for a driveline angle measurement EXCEPT:

Equalize the tire pressure in all of the tires on the vehicle

If a level surface is not available to park the truck on, use jackstands to level the vehicle

Jack up one of the rear tires and rotate the tire by hand until output yoke of the transmission is vertical, them lower the vehicle

Block the tires and place the transmission in neutral

Correct! Wrong!

The recommended maximum run out on a driveshaft measured at the shaft centre is:

.005

.010

.015

.020

Correct! Wrong!

You can usually tell if a driveshaft is twisted by placing it on a level floor and making sure the flat surfaces on the yokes are both fully contacting the floor.

True

False

Correct! Wrong!

For good cancellation, working angles should be no more than ___________deg. difference on a drive shaft.

1

3

5

7

Correct! Wrong!

One of the first signs of drive line trouble is usually:

Loss of power

Vibration

Difficult shifting

Poor clutch engagement

Correct! Wrong!

If a slip yoke is seized-up on interaxle driveshaft damage to the ________________________may occur.

output shaft bearings on rear of front differential

u-joints

pinion bearings of rear differential

All of the above

Correct! Wrong!

A driver reports a relatively sudden onset of drive line noise. After a visual examination of the undercarriage, one of the first things to check would be:

Drive line angles

A seized u-joint or slip joint

Rear axle alignment

Bent frame

Correct! Wrong!

Which of the following will not affect the drive shaft balance?

Missing balance weights

U-joint lubrication

Foreign material stuck to shaft

Bends

Correct! Wrong!

U-joints should be lubricated more frequently in excessive road spray conditions.

True

False

Correct! Wrong!

What is a good way to separate transmission noise from drive axle or wheel bearing noise?

Test the vehicle on downhill grades to eliminate torque on the transmission

Place the drive axle on jackstands, and use the transmission to spin the wheels with no load on them

Lightly apply the brakes while travelling down the road, and listen for any change in the noise

Go for a test drive with the driver of the truck

Correct! Wrong!

A drivershaft without a slip yoke is usually found:

Between the main transmission and auxiliary transmission

Between the main transmission and the steady bearing

Between the steady bearing and the front differential

Between the front differential and the rear differential

Correct! Wrong!

With parallel driveline alignment if the transmission is at -3 deg. the front differential should be at:

+3 deg.

-3 deg.

+6 deg.

-6 deg.

Correct! Wrong!

Before sliding a slip yoke off a stub shaft you should:

Grease the slip yoke

Check the driveshaft for balance

Remove the expansion plug

Put alignment marks on the slip yoke and stub shaft

Correct! Wrong!

A constant velocity joint eliminates the:

Need to balance the driveshaft

Need for a steady bearing

Speed variation caused by U-joint action

Phasing

Correct! Wrong!

Phasing of a drive shaft refers to:

Yoke alignment

Working angles

Grease fitting alignment

Knuckling action

Correct! Wrong!

During a routine drive axle oil change, a technician notices a few metal particles on the magnetic plug of the drive axle. What should the technician do first?

Inform the customer that further investigation is needed

Inform the customer of the condition, and tell them to monitor the amount of particles

Do not follow up with the customer, since some metal particles are normal

Begin to disassemble the drive axle to find the cause

Correct! Wrong!

The purpose of a slip yoke and stub shaft (tube shaft) in a drive line is to:

Reduce vibration

Reduce knuckling

Allow for changes in length of shaft

All of the above

Correct! Wrong!

When greasing a U-joint one should:

Not force grease past seals

Ensure grease exits from all 4 cups

Grease opposite cups separately

Only use low-temp. grease

Correct! Wrong!

The most common cause of U-joint failure is:

Overloading of unit

Rough road conditions

Lack of lubrication

Rough clutch engagement

Correct! Wrong!

When replacing driveshaft center support bearings, a technician should always:

Look for any shims during removal of the old bearing

Pack the bearing full of grease

Measure driveline angles once the new component is installed

Use hand tools; air tools could twist the mounting cage and shorten bearing life

Correct! Wrong!

What should a technician check for when replacing U-joints?

Driveshaft balance

Yoke misalignment

Yoke phasing

Dirt or other clutter on the driveshaft

Correct! Wrong!

In a full time four wheel drive vehicle, or a tandem drive axle truck what is required in the transfer case/power divider?

Differential

High and low range

Planetary gear set

Slip clutch

Correct! Wrong!

A driveshaft should be able to:

Rotate at high speed

Transmit maximum low gear torque

Operate under changing angles

All of the above

Correct! Wrong!

The maximum recommended length for a drive shaft without a steady bearing is:

Four feet

Five feet

Seven feet

Eight feet

Correct! Wrong!

Brinelling of a U-joint is usually caused by:

A sharp working angle

Little or no working angle

Normal working angle

Constantly changing working angle

Correct! Wrong!

A non-constant velocity driveshaft with a working angle speeds up and slows down twice per revolution.

True

False

Correct! Wrong!

Ideally the minimum U-joint working angle on heavy duty truck applications should be no more than:

1 deg.

3 deg.

5 deg.

7 deg.

Correct! Wrong!

Steady bearings are adjustable to correct drive line angles.

True

False

Correct! Wrong!

A vehicle with a lot of driveline vibration could have:

The two methods of drive line alignment are the parallel method and:

Before beginning any service or repair to a drive system:

The prime function of a drive line is to:

The main drawback of using a single cross universal joint applied to a driveshaft system is that:

Propeller shafts must be as short as possible and as large in diameter as possible to:

The two most significant factors in reducing driveline failure is:

To check a two-joint assembly for alignment, you must perform dial indicator tests at three different locations on:

What should a technician do when replacing a support bearing assembly?

A transfer case with an air actuator will not shift from the low gear ratio up to 1:1. The most likely first check is:

A truck has non-functional speedometer while the odometer operates correctly. The LEAST likely cause of the problem would be:

A technician finds dirt contamination when removing the 4X4 axle end-locking hub. What should the technician do?

The following are all acceptable steps to prepare the vehicle for a driveline angle measurement EXCEPT:

The recommended maximum run out on a driveshaft measured at the shaft centre is:

You can usually tell if a driveshaft is twisted by placing it on a level floor and making sure the flat surfaces on the yokes are both fully contacting the floor.

For good cancellation, working angles should be no more than ___________deg. difference on a drive shaft.

One of the first signs of drive line trouble is usually:

If a slip yoke is seized-up on interaxle driveshaft damage to the ________________________may occur.

A driver reports a relatively sudden onset of drive line noise. After a visual examination of the undercarriage, one of the first things to check would be:

Which of the following will not affect the drive shaft balance?

U-joints should be lubricated more frequently in excessive road spray conditions.

What is a good way to separate transmission noise from drive axle or wheel bearing noise?

A drivershaft without a slip yoke is usually found:

With parallel driveline alignment if the transmission is at -3 deg. the front differential should be at:

Before sliding a slip yoke off a stub shaft you should:

A constant velocity joint eliminates the:

Phasing of a drive shaft refers to:

During a routine drive axle oil change, a technician notices a few metal particles on the magnetic plug of the drive axle. What should the technician do first?

The purpose of a slip yoke and stub shaft (tube shaft) in a drive line is to:

When greasing a U-joint one should:

The most common cause of U-joint failure is:

When replacing driveshaft center support bearings, a technician should always:

What should a technician check for when replacing U-joints?

In a full time four wheel drive vehicle, or a tandem drive axle truck what is required in the transfer case/power divider?

A driveshaft should be able to:

The maximum recommended length for a drive shaft without a steady bearing is:

Brinelling of a U-joint is usually caused by:

A non-constant velocity driveshaft with a working angle speeds up and slows down twice per revolution.

Ideally the minimum U-joint working angle on heavy duty truck applications should be no more than:

Steady bearings are adjustable to correct drive line angles.

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Heavy-Duty Mechanic - Trucks & Equipment