Reference Modification no.
- 0 -
Page
100
Date
1997 02 01
Main
914 F
01477
Spalling over a large zone: See Pic. 47 and 48.
Features:
Large size triangular spalling starting at a grey zone or tiny pitting range on
root of tooth. Spalling area of relatively constant depth. Possible additional
incipient cracks across flank. Partial, damage reaches tip range of tooth
resulting in tooth tip fracture.
Cause:
Occurrence normally on operation with oil of low viscosity and high oil
temperature, and the same cause as for formation of pitting.
Conclusion:
â– ATTENTION: At detection of spalling, renew the gear set.
For tolerated pitting and spalling, see chapter progressive pitting.
â—† NOTE: Pic. 47 and 48 depict triangular spalling.
Pic. 47
magnification: approx. 2
times
00153
00154
Pic. 48
magnification: approx. 2
times
â–² WARNING: Always exchange gears set wise. Renewal of a single gear
is not permitted.
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