Page 2-14
Dec/05
DESCRIPTION AND OPERATION
61-00-75
Propeller Owner's Manual
175
The governor uses an internal pump that is driven by an
accessory drive from the engine. This pump uses an engine
oil supply and increases the engine oil pressure for supply
to the propeller. Engine speed sensing hardware within the
governor controls the supply of oil to, or drain of oil from the
propeller, resulting in a change of blade pitch to maintain
constant engine speed.
Oil pressure from the engine-driven governor is supplied to
the propeller mounted hydraulic cylinder through the engine
shaft and propeller hub. Increasing the oil volume within the
hydraulic cylinder increases blade angle to decrease engine
RPM. Decreasing the oil volume will decrease blade angle
to increase engine RPM. By changing the blade angle, the
governor maintains constant engine RPM (within limits),
independent of the throttle setting.
OBSOLETE PROPELLER MODELS. SEE COVER PAGE
WARNINGS AND SERVICE BULLETIN HC-SB-61-331