Week #6 - Drivelines (Chapter 22) Flashcards
The U-joint working angles on most truck driveshaft assemblies should generally not exceed how many degrees?
3 degrees
True or False: A truck driver complains of a driveline vibration, so the problem might be a loose driveshaft yoke.
True
A driveshaft is in phase when ____
the slip yoke and driveshaft tube yoke lugs are perfectly aligned
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
d. all of the above
True or False: Backing off the bearing cap on a U-joint sometimes helps a trunnion to take grease.
True
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
c. Checking driveshaft angles
What is the function of a driveshaft slip spline joint?
It allows the driveshaft to change length while transmitting torque.
True or False: Male slip spline stubs are coated with Glidecoat because it is wear resistant and lasts the life of the driveshaft.
True
Loose engine or transmission mountings can cause excessive driveline angularity resulting in vibration.
True
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.
b. The U-joint has been properly lubricated.
The OEM recommendation for U-joint lubrication interval scheduling on a truck used for an on-highway operation should be how often?
Every 10,000 to 15,000 miles (16,000 to 24,000 km)
True or False: A driveshaft is in phase when assembled so that the yokes are 90 degrees offset.
False
A truck should be road tested both loaded and unloaded to help determine the source of a driveline vibration.
True
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
a. missing U-joint zerk fitting
Which of the following correctly describes an Anglemaster instrument?
a. electronic caliper
b. electronic inclinometer
c. dynamic balance tool
d. linear measurement tool
b., electronic inclinometer
What is the most common driveshaft series rating used on linehaul highway tractors?
1700 series
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.
False
True or False: A truck driver complains of a driveline vibration, so the problem could be worn splines in the slip joint.
True
Driveshaft phasing will be altered by separating a driveshaft at the slip joint and turning by one spline tooth.
True
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?
5
What tools should be used to measure the inclination of a driveline component?
An inclinometer
Grooves worn into the trunnions by the bearing are called what?
Brinnelling
True or False: Driveshaft working angles can be adjusted by adding wedge shims to the spring seats of a leaf spring suspension system.
True
What tools are preferred when separating a U-joint from a driveshaft?
A puller
A driveline vibration can be caused by worn clutch components.
True
True or False: New stub shafts are shipped coated with blue plastic that should be completely removed prior to assembly.
False
