MODIFICATION AR-ENGINE 5497544 - Caterpillar

Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
The following changes are adaptable to the products within the listed serial numbers, and are effective with all products after the listed serial numbers.Replace the 477-0474 Solenoid Valve Gp if the date code is U3416, U3516, U3616, or U3716.Replace the 376-7737 Solenoid Valve Gp with the 522-3955 Solenoid Valve As if a DEF system diagnostic event is active for failure to build and maintain pressure.Table 1 contains the new and previous part numbers for this change.
Table 1
Quantity New Part Number Part Name Previous Part Number
1 477-0474 Solenoid Valve Gp 477-0474
1 522-3955 Solenoid Valve As 376-7737