Propeller Owner's Manual
136
INSTALLATION AND REMOVAL
61-00-36
Page 3-29
Rev. 2 Feb/17
4. Pressure Gauge Attachment to the Pressure Control Unit
A. Hydraulic connection of the cockpit mounted pressure gauge
is shown in Figure 3-11.
B. The pressure gauge is locally procured.
(1) The pressure range of the pressure gauge must be
from a minimum of no more than 25 psi through a high
pressure of no less than 300 psi.
(2) A liquid filled pressure gauge is recommended for
damping of the needle movement.
C. There are many pressure control unit designs available
because of the unique requirements of each
installation/application.
(1) Figure 3-11 shows a sample pressure control unit, which
can vary from the pressure control unit that is suppled.
D. The pressure control unit side that is close to and parallel to
the plunger will have several threaded fittings to connect to
engine oil pressure and internal porting. Refer to Figure 3-11.
(1) The oil pressure gauge is NOT to be connected to the
pressure control unit at these threaded fittings.
(2) The oil pressures under these fittings are not
representative of the control oil pressure in the propeller.
Refer to Figure 3-11.
E. The oil pressure gauge is shown attached to the pressure
control unit at a threaded fitting that accesses the control oil
pressure in the propeller. Refer to Figure 3-11.
(1) The threaded fitting is easily removable and replaceable
with another fitting and hydraulic tube for connection to
the pressure gauge.
F. Some pressure control units have one of two fittings, that
access the control oil pressure in the propeller, as an
expansion type fitting that installs in a smooth bore and is
not field removable for pressure gauge connection. Refer to
Figure 3-11.
