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The oil distribution box fitted on the front wall of the gearbox co-operates with the servomotor located in the propeller hub. The oil is distributed to the servomotor in the hub with the use of aligned pipes located in the gear output shaft hole and the propeller shaft.
The hub internal mechanism is lubricated with oil from the gravity tank. The oil is distributed to the lubricating area of the oil distribution box via an axial hole in the propeller shaft and the gear shaft (outside of the two aligned pipes).
The propeller hub is fitted on the back end of the propeller shaft. The propeller shaft is connected with the output gear shaft by a shrink coupling. In the hydraulic system there are two pumps (including a stand-by one) driven by electrical motors. One of the pumps can be mounted on the gear.
A special stop valve in the propeller shaft ensures maintaining a fixed pitch of the propeller when the oil pressure goes down. After stopping the main motor the pitch can be set at any position with the use of a manual pump.
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