Emergency Buzzer
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 Table..
-
The coolant temperature rises above the preset level shown in Table..
-
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).
Table 1, Maximum Coolant Temperature
|
Maximum Coolant Temperature |
|
|---|---|
|
Engine Model |
°F (°C) |
|
Mercedes-Benz MBE900 |
221 (105) |
|
Cummins ISB |
220 (104) |
Table 1, Maximum Coolant Temperature
Table 2, Oil Pressure Specifications
|
Oil Pressure Specifications 1 |
||
|---|---|---|
|
Engine Model |
Pressure at Idle RPM |
Pressure at Rated RPM |
|
Mercedes-Benz MBE900 2 |
50 psi (345 kPa) |
50 psi (345 kPa) |
|
Cummins ISB |
10 psi (69 kPa) |
30 psi (207 kPa) |
- Oil pressures are 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.
- EPA07 MBE900 engines are equipped with an oil pressure switch. When above minimum pressure, the dash gauge will display the values listed in this table. If below minimum oil pressure, the dash gauge will read 0 psi.