178 22 396.0
Fig. 5.18.06: Hydraulic Power Unit for MAN Alpha CP propeller, the servo oil tank unit
Hydraulic Power Unit for MAN Alpha CP pro-
peller
The servo oil tank unit, the Hydraulic Power Unit
for MAN Diesel & Turbo’s MAN Alpha CP propeller
shown in Fig. 5.18.06, consists of an oil tank with all
other components top mounted to facilitate instal-
lation at yard.
Two electrically driven pumps draw oil from the oil
tank through a suction filter and deliver high pres-
sure oil to the proportional valve.
One of two pumps are in service during normal
operation, while the second will start up at power-
ful manoeuvring.
A servo oil pressure adjusting valve ensures mini-
mum servo oil pressure at any time hereby mini-
mizing the electrical power consumption.
Maximum system pressure is set on the safety
valve.
The return oil is led back to the tank via a thermo-
static valve, cooler and paper filter.
The servo oil unit is equipped with alarms accord-
ing to the Classification Society’s requirements
as well as necessary pressure and temperature
indicators.
If the servo oil unit cannot be located with maxi-
mum oil level below the oil distribution ring, the
system must incorporate an extra, small drain
tank complete with pump, located at a suitable
level, below the oil distributor ring drain lines.
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