KIT-GASKET-MCH 2951108 - Caterpillar

Cleanliness
Contaminants can degrade the quality and life of DEF. The recommended DEF cleanliness target as dispensed into the machine or engine fill tank is ISO 18/16/13. Refer to the Contamination Control Chapter in this Special Publication.Filtering DEF is recommended when dispensed into the DEF tank to achieve the recommended cleanliness targets. DEF filters should be compatible with DEF and should be used exclusively with DEF. Check with the filter supplier to confirm compatibility with DEF before using. Mesh type filters using compatible metals, such as stainless steel, can be used. Paper (cellulose) media and some synthetic filter media are not recommended because of degradation during use. The filter size must be appropriate for the DEF pump design, flow rate, expected pressures and required filter life. Refer to Table 3 below for filtration requirements for Cat engines.For large machine engines including 3500 series and C175 engine models, filtration of DEF as it is dispensed from bulk tank is recommended to support the durability designed into the SCR system. Filters should be located between the bulk DEF tank and the ground level DEF receiver nozzle.Note that Cat Diesel Exhaust Fluid Filter group 491-6779, 40 microns efficiency and Beta value 75 can be used to filter DEF when applicable. Refer to your local Cat dealer for availability.Care should be taken when dispensing DEF. Spills should be cleaned immediately. Machine or engine surfaces should be wiped clean and rinsed with water. Caution should be used when dispensing DEF near an engine that has recently been running.Note: Spilling DEF onto hot components may cause the release of ammonia vapors. Do not breathe ammonia vapors. Do not clean up any spills with bleach.
Table 3
DEF Filtration Requirements For Bulk Tanks in Specific Applications
DEF System Filter Requirements (1) Filter location
All Cat engines except those given below in this Table. Recommended: ≤ 5 microns (µm), Beta value ≥ 1000 Required: ≤ 10 microns (µm), Beta value ≥ 1000 Inlet to DEF Pump Electronic Tank Unit (PETU)
Airless 3500 series and C175 engine models Machine engines (Fast or conventional fill)
Airless Marine applications
Air Assisted, Marine applications ≤ 40 microns (µm), Beta value ≥ 1000 Inlet to DEF Dosing Cabinet
Air Assisted, Locomotive and Electric Power Generation applications
(1) Refer to Caterpillar publication PELJ0133, “Filters, Use of Micron Ratings in the Filter Industry” for clarification of Beta values and filter efficiencyStability
DEF fluid is stable when stored and handled properly. The quality of DEF rapidly degrades when stored at high temperatures. The ideal storage temperature for DEF is between −9° C (15.8° F) and 25° C (77° F). DEF that is stored above 35° C (95° F) for longer than 1 month must be tested before use. Testing should evaluate Urea Percentage, Alkalinity as NH3 and Biuret content.The length of storage of DEF is listed in the following table:
Table 4
Storage Temperature Expected DEF Life
Below 25° C (77° F) 18 months
25° C (77° F) to 30° C (86° F) 12 months
30° C (86° F) to 35° C (95° F) 6 months
Above 35° C (95° F) test