GEAR (52 TEETH) 7K4771 - Caterpillar

Ensure that all components are free of contaminants before installing. Contaminants may cause premature wear and reduced component service life.
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.
Illustration 1 g03716823
(1) Catalyst (SCR) Hatch
Remove Catalyst (SCR) hatch cover (1) nuts, bolts, and washers.
Open or remove hatch cover (1) from the reactor unit.
Remove gasket assembly from the sealing surface of the hatch cover.
Remove SCR catalyst assemblies.
Install the SCR catalyst into the reactor housing (reverse of the removal procedure). Verify the correct position of the SCR catalysts.
Replace all gaskets on the SCR catalyst cover.
Install SCR cover assembly.
Replace all bolts.
Apply final torque to all bolts in a circular pattern. Refer to Specifications, SENR3130, "Torque Specifications" for the proper torque.
Verify that all bolts are at the proper torque value.