SWITCH GP-PRESSURE 4400257 - Caterpillar

Engine Storage
If the engine will not be started for several weeks, the lubricating oil will drain from the cylinder walls and from the piston rings. Rust can form on the cylinder liner surface. Rust on the cylinder liner surface will cause increased engine wear and a reduction in engine service life.To help prevent excessive engine wear, use the following guidelines:
Complete all of the lubrication recommendations that are listed in this Operation and Maintenance Manual, "Maintenance Interval Schedule" (Maintenance Section).
If freezing temperatures are expected, check the cooling system for adequate protection against freezing. See this Operation and Maintenance Manual, "Refill Capacities and Recommendations" (Maintenance Section).If an engine is out of operation and if use of the engine is not planned, special precautions should be made. If the engine will be stored for more than 1 month, a complete protection procedure is recommended.For more detailed information on engine storage, see Special Instruction, SEHS9031, "Storage Procedure For Caterpillar Products".Your Cat dealer can assist in preparing the engine for extended storage periods.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 the system off 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.Removal of SCR Catalysts
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.Catalyst SCR Storage
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