Week #6 - Drivelines (Chapter 22)

Question 1

The U-joint working angles on most truck driveshaft assemblies should generally not exceed how many degrees?

Answer 1

3 degrees

Question 2

True or False: A truck driver complains of a driveline vibration, so the problem might be a loose driveshaft yoke.

Answer 2

True

Question 3

A driveshaft is in phase when ____

Answer 3

the slip yoke and driveshaft tube yoke lugs are perfectly aligned

Question 4

U-joint failures, hanger bearing failures, and driveline vibrations are cause by:

a. missing balance weights
b. loose yokes
c. bent driveshafts
d. all of the above

Answer 4

d. all of the above

Question 5

True or False: Backing off the bearing cap on a U-joint sometimes helps a trunnion to take grease.

Answer 5

True

Question 6

For which of the following is an Anglemaster used?

a. Measuring phase angle
b. Checking shaft runout
c. Checking driveshaft angles
d. all of the above

Answer 6

c. Checking driveshaft angles

Question 7

What is the function of a driveshaft slip spline joint?

Answer 7

It allows the driveshaft to change length while transmitting torque.

Question 8

True or False: Male slip spline stubs are coated with Glidecoat because it is wear resistant and lasts the life of the driveshaft.

Answer 8

True

Question 9

Loose engine or transmission mountings can cause excessive driveline angularity resulting in vibration.

Answer 9

True

Question 10

When lubricating a U-joint, fresh grease appears at all four trunnion seals. Which of the following is probably true?

a. The trunnions are worn and the U-joint should be replaced.
b. The U-joint has been properly lubricated.
c. The bearings are worn and should be replaced.
d. The seals are worn and should be replaced.

Answer 10

b. The U-joint has been properly lubricated.

Question 11

The OEM recommendation for U-joint lubrication interval scheduling on a truck used for an on-highway operation should be how often?

Answer 11

Every 10,000 to 15,000 miles (16,000 to 24,000 km)

Question 12

True or False: A driveshaft is in phase when assembled so that the yokes are 90 degrees offset.

Answer 12

False

Question 13

A truck should be road tested both loaded and unloaded to help determine the source of a driveline vibration.

Answer 13

True

Question 14

Which of the following would be least llikely to affect driveshaft balance?

a. missing U-joint zerk fitting
b. asphalt buildup on the driveshaft tube
c. dents in the driveshaft tube
d. missing balance weights

Answer 14

a. missing U-joint zerk fitting

Question 15

Which of the following correctly describes an Anglemaster instrument?

a. electronic caliper
b. electronic inclinometer
c. dynamic balance tool
d. linear measurement tool

Answer 15

b., electronic inclinometer

Question 16

What is the most common driveshaft series rating used on linehaul highway tractors?

Answer 16

1700 series

Question 17

True or False: When lubricating a U-joint and grease does not exit from one of the four trunnion seals, the U-joint must be immediately replaced.

Answer 17

False

Question 18

True or False: A truck driver complains of a driveline vibration, so the problem could be worn splines in the slip joint.

Answer 18

True

Question 19

Driveshaft phasing will be altered by separating a driveshaft at the slip joint and turning by one spline tooth.

Answer 19

True

Question 20

What is the minimum total number of driveshaft U-joints that would have to be driveshaft on a tandem drive axle truck equipped with a hanger bearing on the front driveshaft?

Answer 20

5

Question 21

What tools should be used to measure the inclination of a driveline component?

Answer 21

An inclinometer

Question 22

Grooves worn into the trunnions by the bearing are called what?

Answer 22

Brinnelling

Question 23

True or False: Driveshaft working angles can be adjusted by adding wedge shims to the spring seats of a leaf spring suspension system.

Answer 23

True

Question 24

What tools are preferred when separating a U-joint from a driveshaft?

Answer 24

A puller

Question 25

A driveline vibration can be caused by worn clutch components.

Answer 25

True

Question 26

True or False: New stub shafts are shipped coated with blue plastic that should be completely removed prior to assembly.

Answer 26

False