2011/07/22 Caterpillar

Engine:

3306B (S/N: B8D1-UP; 8NS1-UP)

3412C (S/N: DJN1-UP; 9EP1-UP; RLR1-UP; RTY1-UP)

3412E (S/N: TGC1-UP)

3508 (S/N: ZAB1-UP; 23Z1-UP)

3508B (S/N: S2A1-UP; S2B1-UP; ZAD1-UP; BGX1-UP)

3512B (S/N: CMC1-UP; FDE1-UP; BLF1-UP; S2G1-UP; S2H1-UP; PTM1-UP; YAM1-UP; YAN1-UP; 6GW1-UP; YAY1-UP; YAZ1-UP)

3512C (S/N: SBG1-UP; SLM1-UP)

3516 (S/N: YAL1-UP; ZAL1-UP; YAS1-UP; 8TW1-UP; GZX1-UP; 25Z1-UP)

3516B (S/N: S2P1-UP; YAP1-UP; PBR1-UP; S2R1-UP; YAR1-UP; ZAR1-UP; GZT1-UP; YAT1-UP; YAW1-UP; 8NW1-UP; FDX1-UP; GZY1-UP; S2Z1-UP)

3516C (S/N: SBJ1-UP)

C175-20 (S/N: BXR1-UP)

G3406 (S/N: R7E1-UP; KAR1-UP)

G3408 (S/N: 6RJ1-UP)

G3412 (S/N: R7A1-UP; KAP1-UP)

G3508 (S/N: CPJ1-UP; CPS1-UP; CPY1-UP)

G3512 (S/N: CRN1-UP)

G3512E (S/N: SSR1-UP; NGS1-UP)

G3516 (S/N: ZBA1-UP; 4EK1-UP; ZAZ1-UP; 25Z1-UP)

G3516B (S/N: ZBB1-UP; ZBC1-UP; JEF1-UP)

G3516C (S/N: GSB1-UP; GZC1-UP; GZZ1-UP)

G3516E (S/N: GAS1-UP)

G3520B (S/N: GZP1-UP)

G3520C (S/N: GZA1-UP; GZB1-UP; GZJ1-UP; GZL1-UP; GZM1-UP; GZN1-UP; RLP1-UP; LGS1-UP)

G3520E (S/N: GZE1-UP; GZH1-UP)

Generator Set:

3412 (S/N: 4BZ1-UP)

3512 (S/N: ZAF1-UP)

3512B (S/N: ZAH1-UP; ZAJ1-UP)

3516B (S/N: ZAP1-UP)

3516C (S/N: SBK1-UP)

C175-16 (S/N: WYB1-UP)

3406C (S/N: C2G1-UP; C5G1-UP; C8G1-UP; C2Y1-UP)

C15 (S/N: PEC1-UP; C5E1-UP; STG1-UP; C5H1-UP; C5L1-UP; CYY1-UP)

C18 (S/N: C6C1-UP; G4C1-UP; N1C1-UP; N1D1-UP; DKE1-UP; EKW1-UP; M1Z1-UP)

C18 GS (S/N: MGS1-UP)

C27 (S/N: DWB1-UP; T4Z1-UP)

C32 (S/N: SXC1-UP; JSJ1-UP)

C9 (S/N: C9E1-UP)

Petroleum Engine:

3512C (S/N: LLA1-UP; LLB1-UP)

3516C (S/N: PES1-UP)

Power Module:

C32 (S/N: MED1-UP)

PM3512 (S/N: BNR1-UP)

PM3516 (S/N: BPD1-UP; KEN1-UP)

ReferenceSpecifications, Systems Operation, Testing and Adjusting, RENR7941, "Caterpillar Digital Voltage Regulator (CDVR)" for complete information on the CDVR.

ReferenceSpecial Instruction, REHS4494, "Installation Instructions for the New Caterpillar Digital Voltage Regulator (CDVR) In Field Retrofit Applications" for removal and installation instructions.

Description of Change: The CDVR has been upgraded for improved durability.

Adaptable To:

Illustration 1	g02644317

The upgraded CDVR 314-7755 Voltage Regulator As is a direct replacement for the former CDVR assembly. The upgraded CDVR is distinguished with "REV A" markings on the sticker. Refer to Illustration 1.

This change is effective for the serial numbers listed in Table 1.