Spicer Drive Axles Failure Analysis Service Manual - Manual (Page 29)

Power Divider
28
P
ower D
iv
ider
Fatigue Failures
Input Shaft - Torsional Fatigue Failure at Splines Input Shaft - Fatigue Failure
Output Shaft - Torsional Fatigue Failure at Splines IAD Spider - Fatigue Failure
General Description: Progressive destruction of a shaft or gear teeth. A high load causes the initial crack. The crack
progresses to the center of the core. Repeated overloads finally cause the shaft to fail.
Usual Causes: • Overloading the vehicle beyond rated capacity
• Abusive operation over rough terrain
Failure Prevention: • Correct Specifications - see Failure Prevention Section
• Torque is Important - see Failure Prevention Section
• Vehicle Load Ratings - see Failure Prevention Section
• Drive Practices and Vehicle Operation - see Failure Prevention Section
Star-shaped
pattern
Star-shaped
pattern
Beach
marks