A New Engine Wiring Harness Assembly Is Now Used For Certain C18 Machine Engines {1000, 1408, 1900} Caterpillar

Articulated Truck

735C (S/N: LFJ1-254; TFJ1-257)

740C EJECTOR (S/N: LFN1-276; TFN1-189)

745 (S/N: 3F61-263; 3T61-154)

745C (S/N: JE81-90118; JE91-102; LFK1-971; TFK1-1545)

Excavator

374F (S/N: AT21-160; AP41-243; EBF1-113; NFJ1-10014; MFL1-10008; DNM1-10004)

390F (S/N: HJD1-10007; TYE1-223; MGF1-10001; FEH1-214; HSM1-306; GAY1-10006)

Landfill Compactor

826K (S/N: 2321-6266; SET1-512)

836K (S/N: LWZ1-231; TWZ1-603)

Material Handler

MH3295 (S/N: PA91-303)

Mobile Hydraulic Power Unit

374F MHPU (S/N: DP41-105; H251-108)

390F MHPU (S/N: B371-98198; H271-1)

OEM Excavator Based Specialty Solution

374F OEM (S/N: FH91-102; P4L1-90201)

390F OEM (S/N: N641-105; PT71-102; P4J1-90200)

Off-Highway Truck/Tractor

770G (S/N: RMA1-101; TWA1-152; KDH1-366; ECM1-334; ECX1-114)

772G (S/N: LTS1-398; KEX1-266; LTX1-210)

Pipelayer

PL83 (S/N: CB21-175)

PL87 (S/N: TEC1-162)

Soil Compactor

825K (S/N: 2331-5021; SEE1-212)

Track-Type Tractor

D8T (S/N: FMC1-763; JET1-205)

D9T (S/N: TWG1-760; REX1-477)

Wheel Dozer

824K (S/N: 2341-4009; RWB1-123)

834K (S/N: LWY1-723; TWY1-603)

Wheel Loader

986H (S/N: L8S1-357)

986K (S/N: MH81-172)

988K (S/N: LWX1-735; TWX1-1162)

Wheel Tractor-Scraper

631K (S/N: WTR1-102; WTW1-104)

637K (S/N: WTS1-111; WTX1-1)

Description Of Change: The new wiring harness assembly used has improved wiring for the secondary speed/timing sensor to prevent failures from high vibrations.

Adaptable To: The following changes are adaptable to the machines with in the listed serial numbers, and are effective with all the machines after the listed serial numbers.

The new and former part numbers are listed in Table 1.