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 HYDRAMECHANICAL PROTECTIVE SYSTEM
SYSTEMS OPERATION
SCHEMATIC NO. 5 (LOW ENGINE OIL PRESSURE FAULT)
(High Speed Range)
1. Selector valve. 2. Low speed oil protection valve. 4. Diverter valve orifice. 6. Speed sensing valve spool. 7.
Diverter valve. 8. Fuel shutoff actuator. 10. High speed oil protection valve. 15. Fuel shutoff sequence valve.
17. Oil pump.
HIGH SPEED RANGE (LOW ENGINE OIL
PRESSURE FAULT)
Make Reference to Schematic No. 5
When engine oil pressure decreases to 205 kPa (30
psi), the spring force on high speed oil protection
valve (10) will move the valve to stop oil flow to the
drain. The difference in oil pressure across diverter
valve orifice (4) will now go to zero. The valve spool
of diverter valve (7) will move down by spring force,
which will cause alignment of the ports to fuel shut-
off actuator (8). The actuator now causes the
governor to move the fuel control linkage to the
"SHUT- OFF" position and shutdown the engine.
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