CONTROL AR-AUXILIARY 3378368 - Caterpillar

Truck735B (S/N: E4R1-1)735C (S/N: LFJ1-254; TFJ1-266)740B (S/N: GLH1-143; E4S1-139)740B EJECTOR (S/N: L4F1-530)740C EJECTOR (S/N: LFN1-277; TFN1-195)745 (S/N: 3F61-263; 3T61-155)745C (S/N: JE81-90119; JE91-102; LFK1-1035; TFK1-1619)Cold PlanerPM620 (S/N: JB91-141; LH91-114)PM622 (S/N: JFC1-133; JCF1-1)PM820 (S/N: TLZ1-1)PM822 (S/N: SL81-1)PM825 (S/N: ESE1-1)Electric Power GenerationXQP500 (S/N: XP21-134)Excavator374F (S/N: AT21-160; AP41-243; EBF1-10036; NFJ1-10047; MFL1-10019; DNM1-10010)390D (S/N: KCZ1-180)390F (S/N: HJD1-10020; TYE1-223; MGF1-10006; FEH1-10032; HSM1-306; GAY1-10022)Landfill Compactor826K (S/N: 2321-6282; SET1-514)836K (S/N: LWZ1-231; TWZ1-613)Load Haul DumpR2900G (S/N: NLK1-162)R3000H (S/N: RCM1-75001; RCY1-127)Material HandlerMH3295 (S/N: PA91-303)Mobile Hydraulic Power Unit374F MHPU (S/N: DP41-10002; H251-110)385C MHPU (S/N: M4E1-115; E1Y1-101)390F MHPU (S/N: B371-98198; H271-90201)Motor Grader24M (S/N: B931-199)OEM Excavator Based Specialty Solution374F OEM (S/N: FH91-90200; P4L1-90205)390F OEM (S/N: N641-90200; PT71-102; P4J1-90201)Off-Highway Truck/Tractor770G (S/N: RMA1-101; TWA1-152; KDH1-375; ECM1-351; ECX1-114)772G (S/N: LTS1-413; KEX1-275; LTX1-210)PipelayerPL72 (S/N: P731-132)PL83 (S/N: CB21-177; KSD1-304; DLW1-1)PL87 (S/N: TEC1-179; ZAC1-154; KKJ1-319)Reclaimer MixerRM500B (S/N: MB91-150; TAS1-131)Rotary DrillMD6290 (S/N: DT81-127)Soil Compactor825K (S/N: 2331-5021; SEE1-212)Track-Type TractorD8R (S/N: JR81-250; DWJ1-341)D8T (S/N: MB81-166; FMC1-785; JET1-205)D9T (S/N: TWG1-763; REX1-487)Underground Articulated TruckAD30 (S/N: GXR1-843)AD45B (S/N: GXM1-198)Wheel Dozer824K (S/N: 2341-4009; RWB1-123)834K (S/N: LWY1-735; TWY1-707)Wheel Loader980H (S/N: PF81-712)986H (S/N: 9861-160; L8S1-357)986K (S/N: MH81-172)988H (S/N: A7A1-333)988K (S/N: LWX1-742; TWX1-1178)Wheel Tractor-Scraper621G (S/N: NEL1-477; MEX1-18)631K (S/N: WT41-1; WT61-101; WTR1-102; WTW1-104)637K (S/N: WTS1-112; WTT1-1; WTX1-1)Description Of Change: An improved milling process results in a better cylinder block surface deck finish on C15 and C18 Machine Engines. The improved cylinder deck surface helps prevent problems with blown head gaskets, coolant leaks, and liner seat erosion.Adaptable To: The following changes are effective with all products after the listed serial numbers.