Manitowoc 2250 Service Maintenance Manual

Reference Only
POWER TRAIN 2250 SERVICE/MAINTENANCE MANUAL
7-14
Published 07-19-16, Control # 249-01
Diesel Exhaust Fluid (DEF) Supply Pump
See Figure 7-12 for the following.
The DEF supply pump (5) is an electronically operated pump
and metering system controlled by the engine control
module (ECM). The pump sends DEF to the DEF dosing
module (6), which is mounted on the decomposition reactor
tube (DRT) (2).
At engine shutdown, the DEF supply pump enters a purge
cycle to prevent DEF from being left in the system, and in
cold climates, from potentially freezing. When it is in the
purge cycle, an audible click and pumping sound is heard
from the pump, and the pump pulls out all of the DEF in the
system and returns the DEF to the tank.
The DEF supply pump is heated electrically and has a 10-
micron filter that requires periodic cleaning and inspection.
For filter maintenance intervals, refer to the engine
manufacturer’s manual.
Selective Catalytic Reduction (SCR) Module
See Figure 7-12 for the following.
The SCR module (7) incorporates a catalyst, two
temperature sensors, and an NO
x
sensor. The SCR module
utilizes a liquid mixture of urea and deionized water (called
DEF) to reduce NO
x
content in the exhaust gas to nitrogen.
The SCR module does not require maintenance.
Excessive NO
x
Warning System
If an excessive NO
x
warning is issued, check anything that
might cause an elevated NO
x
level, such as the following:
• Disconnected DEF tank level or quality sensor
• Blocked DEF hose or dosing module
• Disconnected dosing module
• Disconnected supply module
• Disconnected SCR wiring harness
• Disconnected NO
x
sensor
• EGR valve malfunction
Aftertreatment Protection System (APS)
The APS continually monitors exhaust gas temperatures. If
excessive exhaust temperatures are detected, the APS
illuminates the high exhaust system temperature (HEST)
lamp in the cab.
Decomposition Reactor Tube (DRT)
See Figure 7-12 for the following.
The DRT (2) is a tube mounted between the diesel oxidation
catalyst (DOC)/diesel particulate filter (DPF) module (8) and
the selective catalyst reduction (SCR) module (7).
The DRT module does not require maintenance.
Diesel Exhaust Fluid (DEF) Dosing Module
See Figure 7-12 for the following.
The DEF dosing module (6) injects a liquid mixture of urea
and deionized water (called DEF) into the exhaust stream
ahead of the inlet to the selective catalyst reduction (SCR)
module (7). Coolant lines run through the dosing module to
keep it cool and operable.
Diesel Oxidation Catalyst (DOC)/Diesel
Particulate Filter (DPF) Module
See Figure 7-12 for the following.
The primary function of the DOC/DPF module (8) is to
oxidize the remaining hydrocarbons in the exhaust to carbon
dioxide. It incorporates a dual pressure (dP) sensor and two
temperature sensors.
The DOC module does not require maintenance.
CAUTION
Loss of Power or Engine Shutdown Hazard!
If NO
x
emissions exceed legislated limits, the operator is
alerted with warning lights and audible warnings. If the
condition is not corrected in a set amount of time, an
engine de-rate and shutdown sequence begins.
Refer to Section 3 of the Operator Manual for the
following:
• Identification and location of the engine and exhaust
aftertreatment warning lights
• How to correct an excessive emissions condition

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English