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HYDRAMECHANICAL PROTECTIVE SYSTEM
TROUBLESHOOTING
HYDRAMECHANICAL PROTECTIVE SYSTEM
PROTECTIVE SYSTEM WITH ENGINE SHUTDOWN FOR ALL FUNCTIONS (LOP, HWT, OS)
1. Oil line to air inlet shutoff actuator. 2. Return line from air inlet shutoff actuator. 3. Oil line to thermostatic
pilot valve. 4. Return line from diverter valve. 5. Oil line to diverter valve. 6. From two-way valve at the diverter
valve to drain. 7. From diverter valve to governor (fuel) shutoff actuator.
Many engines run thousands of hours in
If no engine shutdown occurs, further inspection
continuous-duty applications without any operation of the
of the system is needed. The drive coupling and the two-
protective system shutoff actuators, valves and alarms (if
way, 5N641 1 Valve (palm valve) can be tested while the
so equipped).
engine is operating under full load. However, tests of the
air inlet shutoff and the (fuel) shutoff are done with the
Every 500 Service Meter Units, the emergency
engine at low idle.  Use the following procedures to
manual shutoff should be operated. This will check the
check the system more completely.
protective system for correct operation.
DRIVE COUPLING CHECK
NOTICE
Put a rag around the fitting to prevent oil spray
on oil supply line (5) at the diverter valve.
After the emergency manual shutoff has been
operated, the air inlet shutoff valve must be opened.
Operate the engine at low idle and loosen the
Also, the start-up override must be operated to
nut on the fitting at the diverter valve one-half to three-
release hydraulic pressure from the fuel shutoff
quarters of a turn. Shake the line to break the paint. If
actuator before the engine can be started again.
any oil comes out under pressure, the shutoff is being
driven through the coupling. Tighten the nut.
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