Driveline Service Flashcards
Tubes should be visually and accurately measured for what?
Run out
They slip joint should be checked for?
Twisted spines
Looseness of splines
Damage from lack of lube
A loose trans or diff yolk retaining nut can cause…
Excessive movement at this joint which will shorten joint life.
When checking driveline, what is check number 1
Evidence of regular lube and maintenance
What can cause driveline part to fracture?
Seized part is put under stress
Shock loads
What may indicate a issue with a u joint
Rust at one or more of the joint bearing caps.
Not all caps will purge grease
U joint spalling
May be caused by heavy loads resulting in a breakdown of the bearing surface
U joint end galling
May be caused by lack of lube and/or incorrect working angles
U joint false brinelling
Typically caused when joint is working at 0 degree angle and/or lack of lube
U joint pitting
May be due to contaminated lube
U joints grease fittings should be installed how?
pointing toward shaft and aligned with slip joint fitting
What is the proper u joint working angle to ensure proper lube?
1 degree
T/F a balanced driveline vibration should be eliminated if the joint working angles are within 1 degree?
True
How are U joint working angles affected by shaft speed?
The faster the shaft spins the smaller the angle must be
How could a driveline be in phase, but out of balance?
Slip joint was installed 180 degree out of alignment
Driveline angle speed changes
The greater the angle of the slope the greater the speed changes, however as long as joints are in phase and at equal angle the speed changes cancel
shaft slope
If a shaft is sloped down is has a positive degree reading
If a shaft is sloped up is has a negative degree reading
If level has a zero degree reading
Joint working angle (JWA) calculation
Using shaft slope on either side of joint. If both are positive or both are negative you subtract one from another to get JWA. (SAME = SUBTRACT)
If slopes are different add one to other. (DIFFERENT = ADD)
Pos. and neg slope indicator
ONLY A SLOPE DIRECTION INDICATOR, HAS NO FACTOR ON MATH
Single plane JWA
When a drive line angle is viewed from either the top or the side but not both.
Compound JWA
When a driveline angle can be viewed from both the top and side a the same time.
