DAMPER AS 7C8444 - Caterpillar

Pressure Switch (Filter Bypass)
Illustration 1 g01135999
Pressure Switch (Filter) (1) Switch. (2) Schematic symbol.Filter pressure switch (1) has a plunger within the switch that closes the contacts with an acceptable pressure drop across the filter. During normal operation, the switch grounds the signal circuit. The switch plunger will move as the pressure across the filter becomes too great. This allows the switch contacts to open. The open switch tells the main display module that the filter is dirty. The switch is closed when the switch is off the machine.Note: The main display module also considers the fluid temperature before notifying the operator. Cold fluid has a higher viscosity which causes a higher differential pressure than fluid at a normal temperature. The operator is not notified when a filter bypass occurs with a cold fluid. Temperature inhibits are not used with the fuel filter. Rocker Switch (Operator Mode)
Illustration 2 g00867112
Grounding the operator mode selector switch causes the main display module to scroll through the available operator modes for the machine. Opening the operator mode selector switch places the Caterpillar Monitoring System in the currently displayed operator mode. A list of possible operator modes is shown at the beginning of the Modes of Operation Section. See the Operation And Maintenance Manual in order to determine the "Operator Modes" that are available for the machine that is being serviced.