Emergency Buzzer

c2 dm 20.07.016

The emergency buzzer sounds during the ignition sequence and whenever one of the following conditions exists:

  • The engine oil pressure falls below the preset level shown in Fig. .

  • The coolant temperature rises above the preset level, which is 225°F (107°C).

  • The air pressure falls below the preset level, which is 65 psi (448 kPa).

  • The parking brake is set with the vehicle moving at a speed greater than 2 mph (3 km/h).

Oil Pressure Specifications

Note: Oil pressure is given with the engine at operating temperature. With the engine cold, oil pressure may be higher. Individual engines may vary from the listed pressures; observe and record pressures when the engine is new to create a guide for checking engine condition

Table 1, Oil Pressure Specifications

Engine Model

At Idle Speed:

psi (kPa)

At Rated RPM:

psi (kPa)

Cummins ISB

10 (69)

30 (207)

    Table 1, Oil Pressure Specifications

    Note:
    Parent topic: Warning and Indicator Lamps
    Document Number: 0000107412
    Manual Publication Date: 2025-12-10
    Topic Publication Date: 2025-12-10