CLUTCH GP 1204885 - Caterpillar

AUTOMATIC START-STOP SCHEMATIC AUTOMATIC START: ENGINE DOES NOT STARTAutomatic Shutdown
When normal (commercial) power comes ON again, a transfer switch opens both the circuit breaker for the generator power and the initiating contact (IC) in the automatic control panel (ACP) [see line 6]. Now there is no circuit for the run relay (RR) and both closed contact 4 and 7 and contact 9 and 6 open. Run relay (RR) open contact 9 and 3 closes and there is a circuit for the shutdown solenoid (SS) [see lines 7, 23 and 24]. The activated shutdown solenoid (SS) moves the fuel rack to the FUEL OFF position and the engine stops.When the engine speed gets slower as the engine stops, the engine oil pressure decreases and the oil pressure switch (OPS) opens the circuit for the arming relay (AR) and the oil pressure timer (OPT). Now the oil pressure timer (OPT) switch opens. [see lines 10, 11 and 14]. When the oil pressure switch (OPS) opened the circuit for the arming relay (AR) it closed the circuit to the open switch in the oil pressure timer (OPT) and the oil pressure light (OPL) can not go ON.Pressure switch (PSW) has a delay action that keeps the circuit for the shutdown solenoid (SS) closed and the shutdown solenoid (SS) keeps activated for a few more seconds after the engine fuel rack is in the FUEL OFF position. [see lines 21 and 22]. Diode (D2) is to prevent an electric spark (arcing) from the contacts in the shutdown solenoid (SS).
AUTOMATIC START-STOP SCHEMATIC AUTOMATIC START: AUTOMATIC SHUTDOWNManual Shutdown
Move the automatic control switch (ACS) from either the MAN or the AUTO position to the STOP position and contact 8 closes [see line 21]. Now there is a circuit for the shutdown solenoid (SS). The activated shutdown solenoid (SS) moves the fuel rack to the FUEL OFF position and the engine stops.
After the engine stops move the automatic control switch (AVS) away from the STOP position. Any other switch position will de-activate the shutdown solenoid (SS).
The oil pressure light (OPL) does not go ON when the engine is stopped. See AUTOMATIC SHUTDOWN for this explanation.
AUTOMATIC START-STOP SCHEMATIC ENGINE MANUAL SHUTDOWNEngine Shutdown Caused By An Engine Operating Condition
The automatic start-stop system uses sensors, some on the engine, to activate the automatic control panel (ACP) to stop the engine if the engine gets any of these not normal conditions:1. Low oil pressure (oil for engine lubrication) of approximately 8 psi (55 kPa).2. Starting motor that turns the engine crankshaft for too many seconds and the engine does not start (starting motor operation can be adjusted for 30 to 45 seconds).3. Engine speed more than 18 to 20% faster (overspeed) than engine rated rpm.4. High temperature