Fayat Group Dynapac SD2500C Operation & Maintenance Manual page 32

Engine: The paver finisher is driven by a water cooled diesel engine. For further de-
tails see the technical data and the engine's instruction manual.
Various engine variants in different emission classes are available as options.
Stage IIIa / Tier 3 (o): There is no separate exhaust aftertreatment for this engine
type when used in countries without specific regulations.
Stage IIIb / Tier 4i (o): A particulate filter cleans the exhaust gas from the incurred
soot particles, reduces the generation of gaseous carbon monoxide and carbon diox-
ide pollutants and therefore acts as a catalytic converter to minimize environmental
and health pollution. Particulate filter regeneration can be carried out automatically
or manually.
Stage IV / Tier 4final (o): The engine complies with the latest emissions standards
and helps to reduce diesel consumption and improve the working environment.
The exhaust gas aftertreatment system consists e.g. of a diesel oxidisation catalytic
converter (DOC), an SCR catalytic converter (Selective Catalytic Reducer) and an
®
AdBlue / DEF injection system.
The emission of exhaust gases which are harmful to the environment and health is
significantly reduced.
Drive unit: Both caterpillar drives are directly driven by separate drives. They operate
directly, without any drive chains which require maintenance or servicing.
The tension of the caterpillar chains can be readjusted using tensioners.
A swivelling lane cleaner (o), which ensures an even passage during paving, is lo-
cated in front of each of the drive units. Small obstacles lying in the lane are cleared
away to the side.
Hydraulic system: The diesel engine drives the hydraulic pumps for all main paver
finisher drives via the attached distribution gear and its auxiliary drive shafts.
Travel drive: The continuously adjustable travel drive pumps are connected to the
travel drive engines by means of high pressure hydraulic hoses.
These hydraulic motors drive the caterpillar chains via planetary gears that are
mounted directly inside the drive wheels of the caterpillar chains.
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