COUPLING 2S5552 - Caterpillar

Electric Power GenerationC18 MAR GENSET (S/N: SSM1-199; SSW1-160)XQP500 (S/N: XP21-180; XP51-133)Engine3406C (S/N: 7T21-743)C-18 (S/N: JZB1-1526; MEP1-2549)C15 (S/N: XP81-113; BS91-209; KRA18001-20647; TRB1-4793; SWE1-585; N5F1-1349; LDN1-1670; HAZ1-903)C18 (S/N: BG41-557; TNA1-5420; GTB1-5152; JLE1-6074; N8F1-988; BDN1-3206; T2R1-5833; ZPS1-298; GEX1-5309)Generator SetC15 GEN SET (S/N: AR21-783; GB31-90005; T331-392; CE51-163; LNA1-3230; LZA1-503; L8B1-1; C5H1-3153; LXJ1-4280; X5M1-552; NAP1-1681; NSR1-111)C18 GEN SET (S/N: AN21-127; AR31-335; T341-352; ME51-103; T351-130; RT81-1; LNB1-2277; LZB1-214; X5F1-107; PEJ1-240; LXK1-2321; NAW1-858; T4X1-206)Industrial Engine3406 IND (S/N: 6TB81001-82002)C15 IND (S/N: JRE81001-82002; MCW1-81003)C15 INDUSTRIAL (S/N: JKG1-1317)C18 INDUSTRIAL (S/N: JDA1-1027; MMB1-90168; WJB1-544; WJH80001-81006; WRH1-10876)Marine EngineC18 MARINE (S/N: JHL1-740; DTP1-473)C18 MARINE ENG (S/N: T2P1-5229)Petroleum EngineC15 PET GS ENG (S/N: PET1-444)Petroleum Power Train PackageC15P (S/N: PGN1-167)CX31-P600-C15I (S/N: PDM1-196)CX35-P800-C18I (S/N: PCF1-143; PCZ1-176)Petroleum TransmissionCX38-P892 (S/N: PWY1-166)Description Of Change: The process to create the spiral-lock threads in the gears has been improved to correct the torquing procedure and help prevent premature failures.Adaptable To: The following changes are adaptable to the products within the listed serial numbers, and are effective with all products after the listed serial numbers.The improved 249-3360 Camshaft Gear and 361-8240 Camshaft Gear can be identified by the addition of the change level to the end of the stamped part number.