Retrofit SCR Aftertreatment Catalyst (DOC) - Replace Caterpillar

Note: Disposition and Recycling - Common components of exhaust aftertreatment devices include, but are not limited to, cordierite, silicon carbide, iron zeolite, vanadium, platinum, and palladium. After the devices are used in an engine exhaust flow they can include some by-products that result from combustion. Follow applicable Federal, State, and local regulations when handling or discarding used aftertreatment devices.

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Illustration 1	g03670074

1. Remove Catalyst (DOC) hatch cover (1) nuts, bolts, and washers.

2. Remove hatch cover (1) from the reactor unit.

3. Remove gasket assembly from the sealing surface of the hatch cover.

4. Carefully remove DOC catalyst assembly by removing the V band clamps. If necessary, repeat for other DOC catalysts.

5. Carefully install DOC catalyst into the cabinet with new gaskets. Verify correct position.

6. Apply final torque to V band clamps. Refer to Specifications, SENR3130, "Torque Specifications" for the proper torque.

7. Replace all inner backing strip gaskets on the DOC catalyst cover.

8. Install DOC cover assembly.

9. Replace all bolts.

10. Apply final torque to all bolts in a circular pattern. Refer to Specifications, SENR3130, "Torque Specifications" for the proper torque.

11. Verify that all bolts are at the proper torque value.