PREVOST X3-45 COMMUTER User Manual

SECTION 04 : EXHAUST AND AFTERTREATMENT
18
DOB 1300-1556 | X3-45 Commuter PA-1648 Maintenance Manual Section 04 revised March 2021
• Check that the warning plate ”THIS DIFFUSER
SURFACE MUST BE FLUSH WITH THE ROOF
SURFACE”
is still in place.
MAINTENANCE
Diffuser assembly
Inspect the diffuser assembly at the intervals
specified by the Lubrication And Servicing
Schedule in Section 24A.
7. DIESEL EXHAUST FLUID (DEF) TANK
AND INJECTION SYSTEM
The DEF tank and injection system control unit
continuously vary the amount of DEF injected in
response to the engine’s current load conditions.
Diesel Exhaust Fluid (DEF) is stored in a 16
gallons (60 liters) plastic tank located curb side,
in the condenser compartment.
A pump located beside the DEF tank is used to
pressurize the system and deliver the fluid.
A heating coil inside the tank uses engine
coolant to keep the DEF in a liquid state or to
melt DEF at engine start up during cold season.
DEF is injected into the exhaust gases through
an injection nozzle located between the DPF
and the catalytic converter (refer to Figure 1).
In the catalytic converter, nitrogen oxides are
transformed into harmless nitrogen gas and
water.
The system notifies the driver when it is time to
top up with DEF.
7.1. DIESEL EXHAUST FLUID
When handling DEF solution, it is important that
electrical connectors to be connected or well
encapsulated, otherwise there is a risk that the
DEF will cause oxidation that cannot be
removed. Water or compressed air will not help,
since DEF quickly oxidizes certain metals. If a
disconnected connector comes into contact with
the DEF solution, it must be replaced
immediately to prevent the DEF solution from
creeping further into the copper wiring, which
takes place at a speed of about 2.4 in (60 mm)
per hour.
CAUTION
Diesel Exhaust Fluid (DEF) is a nontoxic
aqueous solution of urea (32.5%) and ultra-
pure water (67.5%). Urea is a compound of
nitrogen that turns to ammonia when heated.
The fluid is non-
flammable, and is not
dangerous when handled as recommended.
However, it is highly corrosive to certain
metals, especially copper and brass.
When detaching hoses and components, do

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