New Holland Workmaster 50 Operator's Manual page 13

1 - GENERAL INFORMATION
Exhaust Gas Recirculation (EGR) - Diesel Particulate Filter (DPF)
exhaust treatment - Product overview
What is Exhaust Gas Recirculation (EGR)?
Your NEW HOLLAND machine is equipped with additional components to comply with national and local exhaust
emissions requirements. EGR works by recirculating a portion of the engine exhaust gasses back into the engine
combustion chamber to lower combustion temperatures.
The main components of the EGR system include:
• EGR valve
• Diesel Oxidation Catalyst (DOC)
• Particulate Matter Catalyst (PM Cat)
• Exhaust gas temperature sensors
• Throttle valve actuator
What is a Particulate Matter Catalyst (PM Cat)?
A PM Cat is a high efficiency flow through filter that works based on an open flow design to allow exhaust gases to
pass through. It is made up of alternating layers of corrugated metal foil on a porous metal fleece. The filter captures
particulate matter long enough for catalytic oxidation. By design, a PM Cat cannot plug up, creating no risk of an
uncontrolled regeneration.
How does it work?
When exhaust enters the DOC, many chemical reactions occur. Nitric Oxide (NO) gas enters the DOC to be oxidized
to nitrogen dioxide (NO2). When it enters the particulate matter catalyst, NO2 oxidizes the particulate matter, creating
a continuous, efficient, passive regeneration. This reaction occurs best between 220 - 480 °C (428 - 896 °F).
What if the exhaust isn't warm enough?
A special engine management system has been designed for off road applications to maintain the efficiency of the par-
ticulate matter catalyst, even in situations such as prolonged idling, or low-load applications. During these scenarios,
the engine management software will activate an exhaust temperature management mode to maintain the efficiency
of soot reduction. In this mode, the exhaust gas temperature is controlled via management of multiple injections and
control of the air system. This design enhances passive regeneration in low load conditions, and reduces the need
for an incinerating regeneration.
Manual regeneration
If the thermal management system is disabled for prolonged periods of time, depending on exhaust temperatures, soot
may build up within the particulate matter catalyst. If the soot build-up reaches extreme levels, a manual regeneration
initiated by the operator may be necessary. This is enabled through the instrument cluster, and takes about 15 min.
For these reasons, it is recommended to have the thermal management system remain enabled unless the tractor is
in high fire-risk conditions.
Finding a cleaning facility
To find a NEW HOLLAND dealer that is fully equipped to service your system, call the number below.
Top Service: 1-866-639-4563
na.topservice@newholland.com
US Environmental Protection Agency (EPA) and California Emissions Control Warranty
Statement
NEW HOLLAND warrants to the ultimate purchaser and each subsequent purchaser that the engine is designed,
built and equipped so as to conform with US Environmental Protection Agency regulations applicable at the time of
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