PREVOST X3-45 COMMUTER User Manual

SECTION 01 : ENGINE
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DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual Section 01 revised Jan 2021
5. ENGINE PROTECTION STRATEGY
The engine protection system will automatically
derate or derate and stop the engine when
certain engine conditions reach a critical stage.
In the event of a serious fault, the red STOP
telltale light comes on and an audible alarm will
sound if the engine is running.
Prior to an actual automatic shutdown, the
engine will automatically derate, go to idle, and
then stop in 30 seconds.
ENGINE PROTECTION LOGIC (with yellow
CHECK or red STOP telltale light)
High engine coolant temperature
Shutdown
High engine oil temperature
Shutdown
Low engine oil pressure
Shutdown
High crankcase pressure (rate of
change)
Shutdown
Low coolant level
Derate only
High intake manifold air
temperature
Derate only
High transmission oil temperature
Derate only
High tempe
rature of cooled
exhaust gas (EGR) -
after EGR
cooler
Derate only
EGR valve and position error
Derate only
Variable Geometry Turbo (VGT)
valve and position error
Derate only
High VGT actuator temperature
Derate only
High pre-Diesel Oxidation
Catalyst (DOC) temperature
Derate only
High Compressor Discharge
Temperature (CDT – measured)
Derate only
High soot load
Derate only
High Diesel Particulate Filter
(DPF) pressure differential (DP)
Derate only
OUTSIDE ENGINE PROTECTION LOGIC (no
yellow CHECK or red STOP telltale light)
High altitude (ensures that high
compressor discharge temp. is
never reached)
Derate only
Turbo over-speed
Derate only
Low coolant temperature
Derate only
Crank sensor failure
Derate only
High crankcase pressure -
Absolute Pressure
Shutdown

PREVOST X3-45 COMMUTER Specifications

General

Engine	Volvo D13
Transmission	Allison B500
Fuel Type	Diesel
Length	45 ft (13.7 m)
Width	102 in (2.6 m)
Horsepower	500 hp
GVWR	54, 000 lbs
Height	141 in