BRP-Rotax
Maintenance Manual
72-00-00
page 44
May 01/2007
Effectivity 912/914 Series
Edition 1 / Rev. 0
d02622
3.9.12) Gear set (gear wheels) inspection
The gear set is inspected to detect any damage to the gear-tooth
system.
â—† NOTE: The gear set can be inspected with the gearbox
installed by using an endoscope. This must be done in
such a way that the condition of the gear flanks can be
precisely evaluated.
â– CAUTION: Inspect all gear tooth contact surface for signs of
damage and pitting.
Pitting can take many forms, from tolerable break-in pitting to
spallation. To assist your judgement, please read the following.
General note on pitting:
Pitting is the breaking off of smaller or larger material particles from the
active gear tooth contact surface. Whereas the fracture of a tooth
results in gearbox failure, pitting will not normally influence the running
of the gearbox. There are different degrees of pitting.
â—† NOTE: Fine pitting or areas of pitting hardly influence the
operation of the gear-tooth system.
However, pitting will normally increase with the period of operation.
The speed at which the pitting grows worse depends on the lubricant
used and the load. The pitted area can become so large that the
remaining, unaffected tooth flank can no longer transmit the load
safely. Further operation of the components in this condition will result
in the total destruction of the gear-tooth system.
â—† NOTE: The most common area where pitting forms is on the
base of the gear tooth on the drive gear. For this
reason, inspect the drive gear first.
To Next Page
General
