SCHEMATIC NO. 6 (ENGINE COOLANT TEMPERATURE CIRCUIT) (Low Speed Range Shown)

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SCHEMATIC NO. 5 (LOW ENGINE OIL PRESSURE FAULT) (High Speed Range)

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TM-5-2815-232-14 Engine Diesel Caterpillar Model 3508 Manual

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HIGH ENGINE COOLANT TEMPERATURE CIRCUIT (FAULT CONDITION)

HYDRAMECHANICAL PROTECTIVE SYSTEM

SYSTEMS OPERATION

SCHEMATIC NO. 6 (ENGINE COOLANT TEMPERATURE CIRCUIT)

(Low Speed Range Shown)

1. Selector valve. 2. Low speed oil protection valve. 4. Diverter valve orifice. 7. Diverter valve. 8. Fuel shutoff

actuator. 9. Thermostatic pilot valve. 10. High speed oil protection valve. 15. Fuel shutoff sequence valve.

HIGH, ENGINE COOLANT TEMPERATURE

CIRCUIT (NORMAL CONDITIONS)

Make Reference to Schematic No. 6

Under high coolant temperature conditions, the low

engine oil pressure circuits are used to shutdown an

engine. The schematic shows the low speed range

engine oil pressure circuit in use and the coolant

temperature circuit added to the engine oil pressure

line.

Engine temperature is normal and

thermostatic pilot valve (9) is closed.

Oil flow through the system is the same as in the low

and high speed range of the LOW ENGINE OIL

PRESSURE CIRCUIT.

NOTE: The sensor of the thermostatic pilot valve (9)

must be below the water level in the coolant manifold

to operate.

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