A New Pressure Switch Is Used on Certain G3500 and G3600 Engines {7400} Caterpillar

Gas Engine

G3606 (S/N: 4ZS1-UP)

G3608 (S/N: BEN1-UP)

G3612 (S/N: BKE1-UP)

G3616 (S/N: BLB1-UP)

Generator Set

G3516B (S/N: ZBB1-UP; ZBC1-UP; L6J1-UP)

G3520B (S/N: GZP1-UP)

Power Module

PMG3516 (S/N: KAD1-UP)

Description Of Change: The new Hydrax oil pressure switch provides an increased service life over the former switch assembly.

Adaptable To: The new 459-2591 Pressure Switch replaces the existing 140-9669 Pressure Switch. The new pressure switch is adaptable back to first production on the serial numbers listed above.

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