Catalytic Converter - PREVOST H3-41 Maintenance Manual

SECTION 04 : EXHAUST AND AFTERTREATMENT
CAUTION
HEAVY DEVICE
A suitable lifting or holding device is required.
Properly support and attach lifting equipment
to prevent the DOC and DPF assembly from
falling when servicing.
5. Unfasten clamps holding DOC and DPF
assembly;
6. Carefully lower DOC and DPF assembly;
7. To make sure components are reinstalled in
the same position, mark position of DOC,
DPF and V-band clamps in relation with one
another before taking apart;
CAUTION
FRAGILE - HANDLE WITH CARE
Use extreme care when handling DPF
cartridge as it could be damaged or destroyed
by dropping or sudden impact.
Clean remanufactured DPF filtration cartridge
will be available on an exchange basis. For
this reason, it is very important to maintain the
cartridge in perfect condition. Damaged
cartridge may not be refunded.
8. Also replace V-band clamps and gaskets
when replacing DPF filtration cartridge;
NOTE
When replacing the DPF cartridge, refer to the
specifications on the DPF attached tag for
proper replacement DPF selection.
12 PA1621 Maintenance Manual All Series | January 2017
FIGURE 4: TAKING DOC AND DPF APART
9. Always put DOC and DPF filtration cartridge
back together again in a vertical position to
facilitate gaskets positioning;
10. Tighten V-band clamps.
TORQUE: 20 lb-ft (27 Nm)
CAUTION
Always torque clamps by hand.
11. With a rubber mallet, hit clamps forcefully
around circumference to make sure gasket
is fully seated;
12. Support Diesel Oxidation Catalyst (DOC)
and Diesel Particulate Filter (DPF) assembly
during reinstallation;
13. Reconnect pressure, NOx and temperature
sensors;
14. Fasten straps holding DOC and DPF
assembly;
15. Put insulating blanket back.

4. CATALYTIC CONVERTER

In the first instance, the catalytic converter of the
Selective Catalytic Reduction (SCR) does not