3500 SERIES ENGINES HYDRAMECHANICAL PROTECTIVE SYSTEM Caterpillar

5N8597 Contactor (Coolant)

Switch operates when temperature increases to ... 98.3 ± 0.6°C (208 ± 1°F)

7N5946 Pressure Switch

Circuit 1: normally closed

Circuit 2: normally open

With an increase in pressure, circuit 1 opens and circuit 2 closes at ... 145 kPa (21 psi) max.

With a decrease in pressure, circuit 2 opens and circuit 1 closes at ... 75 ± 20 kPa (11 ± 3 psi)

9D7032 Pressure Switch

With an increase in pressure, switch closes at ... 517 ± 35 kPa (75 ± 5 psi)

With a decrease in pressure, switch opens at ... 415 ± 35 kPa (60 ± 5 psi)