0398358 JOHNSON CARB. ASSY., Port

Aftertreatment Component Storage
Normal periods of inactivity will not require special attention to the SCR system. The SCR is designed to begin and end operation with the output of the power system the SCR is assembled to. Extended periods of inactivity or product storage will require preventative maintenance preparations up to, and including:
Purging the emission reduction system.
Shutting off the system prior to storage.
Cover or plug all inlet and outlet fittings.
Cover any exposed electrical connection fittings.
Protect the dosing cabinet from inclement weather.
Prevent water from entering the CEM.Diesel Exhaust Fluid (DEF) Circulation System
Disconnect electrical service to the DEF supply/circulation system if applicable.
Close all ball or gate valves within the circulation loop.
Shut off all ball valves to the dosing cabinets.
Close off ball or gate valves coming from the DEF (Urea) holding tank.Dosing Cabinets
The dosing cabinet will purge out any remaining liquids in the DEF lines.
Purge sequence takes 6 minutes. Thirty seconds into the purge cycle, put the switch back into the middle position. The purge cycle will continue until completed.
When purge is complete, turn off power to the dosing cabinet using the circuit breaker in the rear right of the electronics shelf.
Remove the DEF injector lance prior to the purge sequence.Note: If the unit is being taken out of service for an extended time and will be in extreme climates, drain all liquid from the cabinet. Empty liquid from dosing cabinet by removing the Y-sediment strainer and dosing pump supply line. Properly discard the DEF and clean the removed parts with deionized water.
Remove all fasteners from the inspection hatch.
Remove SCR catalysts from the reactor.
Remove catalyst from the housing by utilizing the removal tool. Refer to the Disassembly and Assembly manual.
Remove cassettes and support grids.
Remove all insulation and foreign material before exiting the reactor.
Reinstall the inspection hatch.
Store the SCR in a clean and dry location.Prior to performing service on the catalysts, ensure that the catalysts have been properly stored.Catalysts must be stored indoors in a dry place. Exposure to water and subsequent freezing temperatures can cause cracks in the catalysts which would compromise effectiveness. Water can also transport dust, debris, and other contaminants into the microscopic pores of the catalyst. The temperature range for storage is −30° C (−22° F) to 80° C (176° F). The shipping pallets that the C280 catalysts are shipped on are not sealed.Store the catalyst on the side with the ceramic face exposed to minimize the risk of damage to the face of the catalyst. Cover the face of the catalyst to prevent debris from entering and contaminating the catalyst.If the DEF tank was stored for a duration equal to or exceeding that listed in the table below at the corresponding temperature, replace the DEF. If the DEF quality is in doubt, test with a refractometer. DEF must be within the required range defined in ISO 22241-1. For more detailed information about testing DEF quality, contact the localCat dealer.
Table 1
Storage Temperature and Duration
Storage Temperature Storage Duration in Months
10° C (50° F) 36
25° C (77° F) 18
0° C (32° F) 12
35° C (95° F)(1) 6
(1) Significant degradation can occur. Check each batch prior to use.
Drain DEF from the DEF tank (if equipped).
Replace the DEF filter (if equipped).
Start the engine. If a fault code becomes active, turn off the engine and allow 2 minutes to purge. Restart the engine.
If a fault code continues to stay active, refer to the applicable Troubleshooting manual.