freightliner M2 Plus 2023 Manual page 42

Instruments
Minimum Oil Pressure
At Idle Speed:
Engine Model
psi (kPa)
Cummins 15 (103)
Detroit
* 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.
Table 3.3, Minimum Engine Oil Pressure
Engine Oil Temperature Gauge
NOTICE
A sudden increase in oil temperature that is not
caused by a load increase may indicate
mechanical failure. Bring the vehicle to a safe
stop and investigate the cause to prevent further
damage. Do not operate the engine until the
cause has been determined and corrected.
During normal operation, the optional engine oil
temperature gauge should read in the following
temperature range:
•
200 to 260°F (93 to 126°C) for Detroit and
Cummins engines
Under heavy loads, such as when climbing steep
grades, temperatures that exceed the normal oil
temperature range for a short period are not unusual.
If the temperature returns to normal when the load
decreases, there is no problem. See
Fig. 3.38.
10/31/2016
Fig. 3.38, Engine Oil Temperature Gauge
3.21
*
At Rated RPM:
psi (kPa)
35 (241)
14 (97) 55 (350)
Fig. 3.37
Fuel/Diesel Exhaust Fluid (DEF)
Gauge
2
3
06/28/2016
1. Fuel Gauge Pointer
2. DEF Gauge Pointer
3. Low Fuel Warning
Lamp
The fuel and DEF levels can be measured in a dual
purpose fuel/DEF level gauge. See
The diesel fuel and DEF levels are indicated on the
gauge. A low fuel warning lamp illuminates amber
when the diesel fuel level registers 1/8th of capacity.
and
The low DEF warning lamp illuminates amber when
the DEF level reaches 10% of capacity. See
Chapter 13
functions.
Primary and Secondary Air Pressure
Gauges
If air pressure falls below minimum pressure, the
braking ability of the vehicle will be limited. Slow
the vehicle down and bring it to a gradual stop.
Do not attempt to move the vehicle until air
pressure has risen above the minimum level.
Moving a vehicle without adequate braking power
could cause an accident resulting in property
damage, personal injury, or death.
f611381
Air pressure gauges register the pressure in the
primary and secondary air systems. See
4. Low DEF Warning
Lamp
Fig. 3.39, Fuel/DEF Gauge
Emissions, for details of the DEF gauge
WARNING
1
4
f611409
Fig. 3.39.
Fig. 3.40.