SEAL-U-CUP 6J1550 - Caterpillar

Switches
Inside the electronic instrument panel in the upper left hand corner, there are three switches. The switches are used to perform the functions below for Generator Set applications.
Manual Start Crank Switch (MANCS) (2)
Overspeed Verify Switch (OSS) (3)
High/Low Idle Switch (LIS) (1) For marine applications, the switches are used for the functions that are listed below.
Manual Start Crank Switch (MANCS) (2)
Overspeed Verify Switch (OSS) (3)
Prelube Override Switch (PLOS) (1)
Engine Protection Override Switch (EPOS) (4). This switch is used on marine propulsion engines that were built after April 1997 only.
Illustration 1 g00526769
Note: The Prelube Override Switch is present only if the prelube pump (attachment) is part of the engine package. The parameter of the prelube pump must be turned ON by the electronic service tool for this function to work.The MANUAL START CRANK SWITCH (2) permits cranking of the engine by the operator while other controls or protection systems are being overridden. Therefore, the starting motors can be engaged even when the engine control switch is in the OFF/RESET position. Also, the starting motors can be engaged when the engine ECM has completed the cycle crank sequence or when the engine ECM has completed a remote shutdown command. The "Manual Start Crank" switch has the following uses.
System troubleshooting
Engine maintenance
On engines that are equipped with two electronic control modules, the switch will restart the engine when the backup engine control module (ECM) is in control. the switch will restart the engine.Only marine propulsion engines are equipped with more than one ECM (two). Otherwise, the Manual Start Crank switch should not be used for normal operation of the engine.Note: The Manual Start Crank Switch must be used to start the engine when the backup ECM is in control.The Engine Protection Override Switch allows the operator to override the strategies for protection of the propulsion engine Caterpillar Monitoring System. The switch is provided for use in emergency situations when the engine must be operated at full capacity immediately. The switch may be used during a derate condition or a shutdown condition. The switch may not be used during an overspeed shutdown. The switch may also be used to prevent an engine shutdown during critical maneuvers.The Engine Protection Override Switch is a two-position ON/OFF switch. When the Engine Protection Override Switch is in the OFF position, the Caterpillar Monitoring System will operate normally.When the Engine Protection Override Switch is in the ON position, the Engine Protection Override Switch is disabled. The warnings and the overspeed shutdown will continue to function normally. When the Engine Protection Override Switch is in the ON position, the engine will perform as though there are no active derates or no active shutdowns. If the engine has already had a shutdown, the engine can be restarted. The alarm conditions and the events will continue to function normally.When the Engine Protection Override Switch is placed in the ON position, an event will be logged in the ECM. An event will be logged in the ECM when the switch is returned to the