Creation: 01.31 - 2014
1-1-7
GPU - 406
2. Major Component Description
For the purposes of orientation and to familiarize operators and maintenance personnel with the location of
components, the radiator is considered to be at the front of the unit. The generator and controls are at the
rear. Right and left are determined by standing at the rear end facing the instrument panel.
A. Engine
The GPU-400 series is equipped with a 4-cylinder, in-Iine, turbocharged engine, certified to meet EPA
Tier 3 and Euro COM 3A emissions regulations. Tier 4 Final and Euro Stage IV compliant engines are
also available.
All engines used are equipped with electronic governors, which provide precise frequency regulation
and fast transient response. Engine protection such as low oil pressure, high coolant temperature, and
over speed protection are programmed into the engine electronic control module. An engine
diagnostic connector is provided for communicating with the engine. Full-flow fuel and lubrication oil
filters are utilized.
A 24-volt starting motor and alternator are used, as well as a heavy duty spark arresting exhaust
silencer and dry-type air cleaner. The fan is a pusher type, which sucks the air into the unit through
the bottom, underneath the generator, and pushes it across the radiator and turbocharger air cooler,
and finally out the roof of the unit.
REFER TO CHAPTER 5, CUMMINS QSB OPERATION AND MAINTENANCE MANUAL FOR MORE
INFORMATION ON THE ENGINE.
B. Aftertreatment System
The Tier 4 Final engine is equipped with a special exhaust system that treats the emitted exhaust gas
from the diesel engine to reduce harmful emissions. The exhaust system processes the exhaust gas
by first passing it through a Diesel Oxidation Catalyst (DOC) to reduce unburnt hydrocarbon and CO
emissions. Then, the exhaust gas passes through a Selective Catalytic Reactor (SCR) which, along
with the Diesel Exhaust Fluid (DEF), reduces NO
X
emissions.
The parts that support the SCR include the DEF supply module, heater lines, and DEF tank. These
parts aim to regulate the temperature and delivery of DEF to the exhaust system. Refer toError!
Reference source not found. Figure 9 for more detail.
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