SEAL 5P4933 - Caterpillar

Retrofit SCR System
The Retrofit Selective Catalytic Reduction (SCR) System may have the following components:Common Arrangement Identification Number
Illustration 1 g06145370As supplied from the factory, the dosing cabinet and CEM are serialized together under one product Common Arrangement - AFTM.When installed, the Common Arrangement - AFTM serial number of the CEM and of the Dosing Cabinet must match. If the two components are not paired correctly, a fault code will be activated.The Common Arrangement - AFTM serial number can be found on the CEM to the left of the SCR catalyst access hatch. The corresponding Common Arrangement - AFTM dosing cabinet-mounted serial number plate is just off center of the dosing cabinets front connection face. The Common Arrangement - AFTM Part Number, Serial Number, and Config Group must all match in order that the system work correctly. If the labels do not match, contact your dealer for assistance.Note: The Common Arrangement 8-digit Serial number should be referenced when contacting your Caterpillar dealer for service in addition to the engine serial number. This action will indicate to the Caterpillar dealer that there is an aftertreatment unit installed in addition to the engine. There may be other serial numbers present on the CEM and dosing cabinet. For manufacturing use only and will most likely be 10 digits in length.CEM Identification
Illustration 2 g06067128
Typical location of the CEM identification plate. The identification plate is on top of the CEM housing. The specific location may be different depending on CEM configuration.
Selective Catalytic Reduction Substrate
Operating an SCR catalyst above the design maximum temperature limit will reduce the catalyst life and damage the catalyst.
Caterpillar offers two SCR catalyst formulations. (Vanadia Based and Copper Zeolite Based). Your Cat dealer can provide details on the type of catalyst being used in your application. Catalyst array size and Catalyst formulation are selected at the time of order to match the engine and emissions site requirements. The system requires liquid Diesel Exhaust Fluid (DEF) to be sprayed into the system and allowed to evaporate into water vapor and ammonia. The ammonia reacts with exhaust gas and catalyst to convert oxides of nitrogen to harmless water and nitrogen.Aftertreatment System Description
Illustration 3 g06031628
Caterpillar supplied aftertreatment components are illustrated with dashed line rectangles.
Selective Catalyst Reduction (SCR) catalyst technology is used to reduce NOx emissions and particulate matter.The aftertreatment system is composed of the following components:
Air compressor
Bulk Urea Transfer Pump
DEF Dosing cabinet
DEF Filter
DEF Mixing tube
DEF Nozzle
DEF Supply tank
SCR catalysts
SCR reactor housingEngine exhaust flows in