BRP-Rotax
Maintenance Manual
Effectivity 912/914 Series
Edition 1 / Rev. 0
72-00-00
page 7
May 01/2007
d02622
2.2) Hydraulic governor
See Fig. 72 -2
â—† NOTE: Not included in the range of delivery.
A hydraulic governor can be fitted on engines of the 912/914 Series configu-
ration 3 to control a hydraulic constant speed propeller. Engines of the 912/
914 Series configurations 2 and 4 can be retrofitted for this purpose.
i.e., the drive for the governor in the propeller gearbox and the crankcase,
its connection cable and the oil feed line to the propeller shaft must be retro-
fitted.
– On configuration 912/914 - 2, the hollow propeller shaft must also be
exchanged for the correct one
– On configuration 912/914 - 4, the propeller shaft can remain. It is the same
design as for configuration 912/914 - 3, with the exception that the inside bore
is plugged. After removal of the plug cover the propeller shaft is suitable for
use with a governor.
â—† NOTE: Installation of both the hydraulic governor and vacuum pump is
not possible.
â—† NOTE: The gear ratio crankshaft to vacuum pump or propeller governor
is 1,722 or 1,842, depending on engine type.
Direction of rotation of the governor ........................... counterclockwise,
(CC) looking from the magneto side above onto the governor flange.
08218
Fig. 72-2
Gear ratio [i]
crankshaft : propeller shaft
50 : 22 2,273* 51 : 21 2,429
propeller shaft : governor
22 : 29 0,759 22 : 29 0,759
Total
* optional 2,429 possible
912 A/F/UL
912 S/ULS/ULSFR
914 Series
1,722 1,842
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