HOUSING 5K3078 - Caterpillar

Troubleshooting
Troubleshooting can be difficult. On the following pages there is a list of possible problems. To make a repair to a problem, make reference to the cause and correction.This list of problems, causes, and corrections, will only give an indication of where a possible problem can be, and what repairs are needed. Normally, more or other repair work is needed beyond the recommendations in the list.Remember that a problem is not normally caused only by one part, but by the relation of one part with other parts. This list can not give all possible problems and corrections. The serviceman must find the problem and its source, then make the necessary repairs.Troubleshooting Index
1. Engine Will Not Start.2. Engine Will Start, But Shuts Down When Oil Pressure Override is Released.3. Engine Will Only Run Below 70% of Rated Speed.4. Air Inlet Shutoff Activates on Load Rejection.5. Air Inlet Does Not Close.6. Engine Will Not Restart After Operation of Emergency Manual Shutoff.7. Engine Will Not Shutdown When Checking Low Engine Oil Pressure Protection Circuit.8. Shutoff Control Unit Does Not Operate.
FIGURE 1. PROTECTIVE SYSTEM OIL LINES
1. Plug. 2. Oil line to thermostatic pilot valve. 3. Oil return line from diverter valve. 4. Oil supply line to diverter valve. 5. Oil drain line from diverter valve.
FIGURE 2. PROTECTIVE SYSTEM OIL LINES
2. Oil line to thermostatic pilot valve. 3. Oil return line from diverter valve. 4. Oil supply line to diverter valve. 5. Oil drain line from diverter valve. 6. Cover on actuator valve body.Engine Will Not Start Engine Will Start, But Shuts Down When Start-Up Override Is Released Engine Will Only Run Below 70% Of Rated Speed Air Inlet Shutoff Activities On Load Rejection Air Inlet Does Not Close Engine Will Not Restart After Operation Of Emergency Manual Shutoff Engine Will Not Shutdown When Checking Low Engine Oil Pressure PROTECTION CIRCUIT Shutoff Control Unit Does Not Operate 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 continuous-duty applications without any operation of the protective system shutoff actuators, valves and alarms (if so equipped).Every 500 Service Meter Units, the emergency manual shutoff should be operated. This will check the protective system for correct operation.
After the emergency manual shutoff has been operated, the air inlet shutoff valve must be opened. Also, the start-up override must be operated to release hydraulic pressure from the fuel shutoff actuator before the engine can be started again.
If no engine shutdown occurs, further inspection of the system is needed. The drive coupling and the two-way, 5N6411 Valve (palm valve) can be tested while the engine is operating under full load. However, tests of the air inlet shutoff