Section 09: PROPELLER SHAFT
PA1593
4
4. EXPLANATION OF COMMON DAMAGES
1. Cracks: Stress lines due to metal fatigue.
Severe and numerous cracks will weaken the
metal until it breaks.
2. Galling: Scraping off of metal or metal
displacement due to friction between surfaces.
This is commonly found on trunnion ends.
3. Spalling (surface fatigue): Breaking off of
chips, scales, or flakes of metal due to fatigue
rather than wear. It is usually found on splines
and U-joint bearings.
4. Pitting: Small pits or craters in metal
surfaces due to corrosion. If excessive, pitting can
lead to surface wear and eventual failure.
5. Brinelling: Surface wear failure due to the
wearing of grooves in metal. It is often caused by
improper installation procedures. Do not confuse
the polishing of a surface (false brinelling), where
no structural damage occurs, with actual
brinelling.
6. Structural Overloading: Failure caused by a
load greater than the component can stand. A
structural overload may cause propeller shaft
tubing to twist under strain or it may cause cracks
or breaks in U-joints and spline plugs.
5. TROUBLESHOOTING
Refer to "Spicer Life Series Driveshafts Service
Manual".
6. SPECIFICATIONS
PROPELLER SHAFT
ALL VEHICLES EQUIPPED WITH ALLISON WORLD TRANSMISSION
Make ........................................................................................................................................... Hayes-Dana Inc.
Series ......................................................................................................................................................... SPL250
Prevost number .......................................................................................................................................... 580090
Length ........................................................................................................................................................ 485 mm
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