Manitowoc 2250 Service Maintenance Manual

Reference Only
Manitowoc Published 07-19-16, Control # 249-01 7-15
2250 SERVICE/MAINTENANCE MANUAL POWER TRAIN
7
Diesel Exhaust Fluid (DEF) Heating and
Cooling System
See Figure 7-12 for the following.
Warm coolant from the engine is routed to the coolant
manifold (4) where it splits into two paths—one path delivers
coolant to the heat exchanger in the DEF tank (1) to keep the
DEF warm, and the other path delivers coolant to the DEF
dosing module (6) to keep it from overheating.
The coolant control valve (3) adjusts coolant flow according
to the temperature of the DEF in the DEF tank. If the tank
temperature drops below –4°C (25°F), the ECM opens the
solenoid valve, and engine coolant flows through the heat
exchanger in the DEF tank.
To keep the DEF flowing during cold temperatures, two
heating elements are provided—one in the DEF supply
pump and one in DEF line. The heating elements turn on if
the ambient air temperature sensor reads a temperature
below -4°C (25°F).
The DEF dosing module does not prime the system until
every component is completely defrosted. If ambient
conditions continue to be cold after the system has primed,
the ECM commands a maintenance heating cycle to prevent
the DEF system from refreezing. This feature cycles the
heating on and off to the DEF lines, DEF tank, and dosing
module.
NOTE: DEF freezes at –11°C (12°F) and, when frozen,
expands by 7%. There are no approved additives
to improve the freezing point.
Item Description
1 Diesel Exhaust Fluid (DEF) Tank
2 Decomposition Reactor Tube (DRT)
3 Coolant Control Valve
4 Coolant Manifold
5 Diesel Exhaust Fluid (DEF) Supply Pump
6 Diesel Exhaust Fluid (DEF) Dosing Module
7 Selective Catalyst Reduction (SCR) Module
8 Diesel Oxidation Catalyst (DOC)/Diesel Particulate Filter (DPF) Module
9Drain Valve
FIGURE 7-12

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English