VALVE GP-RELIEF 9T0122 - Caterpillar

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To prevent personal injury due to accidental starting of the engine, disconnect the batteries before doing maintenance or repair work.
To restart the engine, do the following steps:1. Turn engine control switch (ECS) to STOP.2. Correct the low oil pressure fault.3. Rotate the ECS to RESET position which opens the circuit across ECS terminals (8 and 5) (line 36). This allows the OPR (line 39) to de-energize. OPR contact (line 40) opens and shuts off the light (OPL). Also, OPR contact (line 52) opens to de-energize the relay (ENFR). The contact across ENFR (7 and 1) (line 56) closes to allow restart.4. The system is ready to start if ECS is turned to START or AUTO.Engine Shutdown Caused By Water Temperature Fault
Simplified schematicWhen engine coolant temperature becomes too high, WTS contacts (2 and 3) (line 43) open and de-energize relay RR (line 56). The contact across RR (8 and 5) (line 14) opens to de-energize SR1. Without current to SR1, the fuel solenoid (line 11) will shutdown the engine.Relay RR (6 and 9) (line 17) opens to prevent the starting motor magnetic (SMMS1) (line 17) from energizing. Relay RR (7 and 4) (line 20) opens which stops the flow of current to the arming relay