Toro Groundsmaster 4500-D Series Service Manual page 100

Removal
Yanmar Diesel Engine: Service and Repairs
Groundsmaster models that are powered by a diesel engine that complies
with EPA Tier 4 emission regulations are equipped with an exhaust system
that includes a diesel oxidation catalyst (DOC) and a diesel particulate filter
(DPF). These exhaust components require service or component replacement
at intervals identified in your Operator's Manual. Additionally, the exhaust
assembly uses two (2) temperature sensors and a pressure differential sensor
which are used as inputs for the engine ECU to monitor the operation of the
exhaust system.
The diesel particulate filter (DPF) is cleaned periodically through a regenerative
process that is controlled by the engine ECU (see
30887) (page 2–4)). The InfoCenter display will identify the status of DPF
regeneration. At recommended intervals, DPF reconditioning is necessary which
will require exhaust system disassembly, DPF removal and DPF reconditioning
by a company that has the necessary equipment. Once the DPF has gone
through the reconditioning process, it can be re−installed in the exhaust system.
Contact your Toro Distributor for information on reconditioning the DPF.
The diesel oxidation catalyst (DOC) has a service life expectancy and requires
replacement at recommended intervals. Replacement of the DOC will require
exhaust system disassembly, removal of the existing DOC and installation of the
new DOC. Contact your Toro Distributor for information.
Refer to the Parts Catalog to identify individual components for the exhaust
system on your Groundsmaster. Contact your Toro Distributor for information.
g307831
1. Engine
2. Exhaust pipe
3. Clamp assembly
Note: The exhaust system DPF and DOC can be removed from the exhaust
system without removing the entire exhaust from the engine. Certain engine
service procedures (e.g. rocker cover removal for valve clearance adjustment)
will require removal of the exhaust system assembly.
Figure 25
4. Flange nut (4 used)
5. Exhaust flange
6. Exhaust gasket
Page 4–28
Engine (Models 30885 and
Groundsmaster ® 4500-D/4700-D
19245SL Rev A