401B: Driveline Fundamentals & Service Flashcards
DRIVELINE FUNDAMENTALS AND SERVICE 190401b
Why is correct phasing of a driveline important?
Vibration free driveline
What tool is used to check for phasing?
Inclinometer or bubble level
What is the minimum degree needed for lubrication in a driveline?
1°
If a driveshaft is angled down from the front to back, what type of angle does it have?
Positive angle
If both readings of the angle of the driveshaft u-joint are positive, what should be done to the reading to find the working angle?
Subtract them from eachother
If one shaft u-joint slopes up and the other slopes down, what must be done to the angles to find the working angle?
Add them together
What should be done with exposed driveshafts, above the frame of the vehicle, in regards to safety?
Use guards or shields
On a long single driveshaft what should be used to help support the load?
Midship bearing, steady bearing, or center support bearing
Are midship bearings generally either sealed or serviceable?
Sealed
What is the purpose of a slip joint in a driveshaft?
To allow for change in length, caused by suspension travel
What is the basic purpose of the drivetrain?
To transmit power from the drive member to the driven member
What can cause damage to the driveline tube?
- Impacts from terrain
- Overloaded
- High torque load
A bent/damaged driveline tube can be cause what symptom?
Vibration
Durring the manufacturing process, is the driveline balanced with or without both universal joins installed?
With u-joints installed
Describe a trunnion on a u-joint?
Highly polished bearing surface, located at the end of each u-joint cross arm
Why is greasing all four bearings caps/trunnions important on a driveline u-joints?
If any bearing cap is not receiving grease, it will fail prematurely
What is the small amount of play between internal and external splines on a driveline for?
To allow grease to get in between them
If a driveline is well lubed and the slip joint has play up and down AND side to side, what condition is the slip joint in?
Failed, worn out
If a slip joint is worn out what could be the operators complaint?
Vibration
What are the three versions of Yokes?
- Half round
- Full round
- Wing style
401B Pg. 12
What is another name for a broken-back driveline arrangement?
Intersecting angle
What types of damage can be seen on the splines of a split joint?
Twisted
Galling
Excessive movement/play
What are some signs of lack of lubrication in a driveline?
False brinelling
Rust
Galling
What can cause pitting in a u-joint?
Contaminated lubricant
Who is the best person to check for the balance of a driveshaft?
A specialized driveshaft shop
Stationary test of driveline are done in what position in the transmission?
Neutral
What speeds should be gone through in a stationary test?
Idle to governed speed
For on-road application, what is generally the largest allowable working angle in the drivetrain?
3°
A brokeback drivetrain system has a positive angle of 3° at one end and a negative angle of 3° at the other end, what is the result?
Zero degree working angle
What is the first visual indication of worn u-joints?
RUST
What can cause universal trunnions to have end galling?
Lack of lube or high working angle
What is generaly considered to be the maximum length of a single driveshaft?
72”
What are common causes of the following u-joint trunnion wear:
Spalling
End Galling
False Brinelling
Pitting
Spalling: Heavy loads
End Galling: Lack of grease, too high orking angle
False Brinelling: Too low working angle, lack of grease
Pitting: Contamination
401B Pg. 23
