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Chapter 22
End of Chapter Review Questions Answer Key
1. U-joint failures, hanger bearing failures, and driveline vibrations are caused by:
2. A truck driver complains of a driveline vibration. Technician A says that the problem
might be a loose driveshaft yoke. Technician B says that the problem could be worn
splines in the slip joint. Who is correct?
3. Which of the following would be least likely to affect driveshaft balance?
4. When lubricating a U-joint, fresh grease appears at all four trunnion seals. Which of
the following is probably true?
5. The OEM recommendation for U-joint lubrication interval scheduling on a truck used
for an on-highway operation should be:
6. Technician A says that a driveshaft is in phase when assembled so that the yokes are
90 degrees offset. Technician B says that driveshaft phasing will be altered by
separating a driveshaft at the slip joint and turning by one spline tooth. Who is
correct?
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7. Which of the following tools should be used to measure the inclination of a driveline
component?
8. Technician A says that when lubricating a U-joint and grease does not exit from one
of the four trunnion seals, the U-joint must be immediately replaced. Technician B
says that backing off the bearing cap on a U-joint sometimes helps a trunnion to take
grease. Who is correct?
9. A driveshaft is in phase when:
10. The U-joint working angles on most truck driveshaft assemblies should generally not
exceed:
11. Which of the following tools is preferred when separating a U-joint from a driveshaft?
12. Technician A says that driveshaft working angles can be adjusted by adding wedge
shims to the spring seats of a leaf spring suspension system. Technician B says that
loose engine or transmission mountings can cause excessive driveline angularity
resulting in vibration. Who is correct?
13. Grooves worn into the trunnions by the bearings are called:
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14. Technician A says that a driveline vibration can be caused by worn clutch
components. Technician B says that a truck should be road tested both loaded and
unloaded to help determine the source of a driveline vibration. Who is correct?
15. What is the function of a driveshaft slip spline joint?
16. What is the most common driveshaft series rating used on linehaul highway tractors?
17. For which of the following is an Anglemaster used?
18. Which of the following correctly describes an Anglemaster instrument?
19. Technician A says that new stub shafts are shipped coated with blue plastic that
should be completely removed prior to assembly. Technician B says that male slip
spline stubs are coated with Glidecoat because it is wear resistant and lasts the life of
the driveshaft. Who is correct?
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?