HET 4 DRIVELINE 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
How accurate are inclinometers?
1/4 degree
What is the minimum degree needed for lubrication in a driveline?
1°
What is the preferred angle for lubrication of the driveline?
high driveline angle
When taking a bubble level scale reading from one u-joint yoke to the next, what condition is the driveline in if the readings are not 0 on both?
Tube could be twisted
Slip joint assembled incorrectly
What do the readings on the bubble scale level mean if they are zero on both universal joint yokes on the driveline?
Driveline is in PHASE
If the slip joint is installed 180° out of alignment, what would the phasing and balance be of the driveline?
Phasing would look correct but the balance would be out
If a driveshaft is angled down what type of degree does it have? (positive, zero or negative)
Positive dregree
If a driveshaft is level what degree does it have?
positive, zero or negative
Zero degree
Where should your inclinometer be placed when checking for phasing?
on a machined surface
the yoke is usually cast and might not be a good surface to take a reading from
When taking a reading on the driveline with a bubble level gauge, is it okay to move it any which way while switching which u-joint is being measured?
NO, same direction same way from each point
Why is driveline phase and yokes being parallel to each other important?
so no vibration is created and u-joints are able to spread lube
When measuring driveline, at what end of the vehicle should you start at?
the front of the vehicle (transmission output shaft)
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
When are multiple drive shafts used?
Tandem Rear Axle
Long wheel base
Aux transmission - more gear selections
True or False?
Seals can handle and support the weight of the driveshaft?
FALSE
What should be done with exposed driveshafts, above the frame of the vehicle, in regards to safety?
Guards, shields
On a long single driveshaft what should be used to help support the load?
Midship bearing, steady bearing or center support
On what type of vehicles are single driveshafts used on?
Short-wheel based vehicles
Midship bearings are generally sealed or serviceable?
Sealed
What is the purpose of a slip joint on a driveshaft?
To handle 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 dictates the allowable limits in a drivetrain?
Manufacture spec, service manual
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
To true the balance of a driveshaft what can be done?
Weights can be added to balance the driveshaft
Is it every allowable to have a driveshaft out by one tooth, in regards to phase?
Yes, engineered design - heavy torque loads
Is runout important on a driveline?
Yes, there very specific allowances for runout
Is the driveline balanced with or without both universal joins?
With u-joints