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Rotax gear drive: Updates have occurred to the Rotax A/B/C/E reduction drives.
Rotax ultralight aircraft engine gearbox updates.
UltralightNews.com
Vent cap update-Rotax has updated the vent cap on the gear drive to that shown here . This
update helps prevent loss of gear drive oil due to siphoning action of the propeller, or gear
drive internal pressure, which can result in gear drive failure due to lack of oil .
Another update changes the main gear in the drive from a gear with holes in the sides of it
to a solid gear . Failure of this gear was evident by missing teeth or cracks running from the
gear teeth to the holes.
The Dog hub has also been update from a two dog hub to a 4 dog hub. On the old system if
the engine has a prop strike the gear drive would have to be taken apart to reposition
the hub. With the new 4 hub system it simply jumps to another hub .
On C drive model gear drives the torque value has been
updated on the gear retaining nut.
Another common problem with the C drive is a leaking seal at the back of the drive.
Signs of failure of this seal will be gear oil coming out of the two holes on the side of the drive,
where the rubber coupler is visible.
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The first was an update from 2 groups of four spring washers on the output shaft to 3 groups of 4 washers .
Reason -- failure of the spring washers resulting in hard starting.
The output prop hub was also update from a two piece steel shaft/aluminum hub arrangement to a one piece
steel shaft and hub. Reason -- failure of the aluminum hub, and stripping of the prop bolt retaining
threads in the hub.
Another update was going from a 3 bolt gear box to engine adapter plate to a 4 bolt
engine adapter plate.
Reason - failure of the bolts holding the adapter plate to the engine, causing
loss of drive, or damage to engine case. .
