Flashcards in 401b Driveline Fundamentals and Service Deck (18):
Identify three (3) functions of a driveline assembly.
- provides a means of transmitting power
- allows angle changes to occur in the path of power
- allows length changes to occur in the driveline
A basic driveline configuration has one shaft. More complex driveline configurations use _____?
When two driveline assemblies are used on a vehicle with a long wheelbase, what type of bearing must also be used on that type of driveline arrangement?
centre support bearing, sometimes called a midship bearing.
Explain how a multiple shaft driveline arrangement can work without using a center support bearing or midship bearing?
The vehicle could be equipped with a tandem rear axle assembly or an auxiliary transmission. This shortens the distance between major components and eliminates the need for a centre support bearing.
Explain what safety precaution(s) should be taken when stationary engines are using any sort of driveline to transmit power to a pump or other device.
- Use suitable guards around the driveline components.
- Do not work on moving driveline components.
Identify two (2) common types of damage that can be sustained by a driveline tube.
Any two (2) of the following are correct.
- bends (due to impacts)
- twists (due to overloading and shock loads)
- impact from objects
- contact with the terrain
When a new driveline tube is installed, the overall driveline length should be the same size as the old one. What are two other checks/adjustments that should also be done to the rebuilt driveline assembly before installation?
- runout checks (compare to specifications).
- balancing of the assembly (within allowable limits).
Identify possible driveline problems that may arise if a vehicle wheelbase is lengthened.
- The old driveline may need to be retubed for the new length.
- If the distance is too great, a multiple shaft arrangement may need to be fabricated.
- A centre support bearing may be required.
Identify the two (2) types of driveline arrangements used to enable each pair of universal joints to have equal working angles.
- parallel arrangement
- broken-back or intersecting angle arrangement
When installing a universal joint, the grease fitting can point toward the shaft or away from the shaft since the direction it faces is not important.
false; The manufacturer often specifies the direction the fitting must face.
Which device allows a driveline to change in length during operation?
slip joint or slip yoke
Explain the purpose of the centre support bearing.
It supports the weight of one shaft in a multiple shaft driveline and accurately positions one shaft in relation to another shaft.
When replacing a universal joint you notice the trunnions have false brinelling. After replacing the universal joint, what is the desired universal joint working angle to ensure proper lubrication?
When bearing straps are used, new retaining cap screws coated with a self-locking compound should be used when installing universal joint bearing cups.
A driveline is said to be in phase if the centrelines of the two yokes on that driveline are in line with each other, when viewed down the length of the driveline.
A balanced driveline vibration should be eliminated if the universal joint working angles are equal, or at a difference of no more than one degree.
A driveline may have to be offset to one side. The universal joint working angles must be calculated with the offset measurement taken into account.