COVER 2S6532 - Caterpillar

8T-8639 Low Pressure Switch (NORMALLY OPEN)
To test the switch:
1. Disconnect the switch from the machine harness.2. Connect the 146-4080 Multimeter to the two connector pins, and place the meter in the Ohms position.3. Measure the switch resistance.4. If the system is charged above 344 kPa 34 kPa, the meter will display less than 1 ohm.5. If the resistance displayed is "OL", and the system pressure is not below specification, replace the switch.6. Every time the switch fails, also test for arc suppressor functionality.7. If the switch is removed, ensure the new switch wires are securely cable-wrapped to prevent vibration damage. The meter can display "OL" if the switch contacts are dirty. The switch contacts can become dirty if the arc suppressor is no longer functioning. The meter will display "OL" if the switch is not threaded into the A/C system.3E-6462 High Pressure Switch (NORMALLY CLOSED)
To test the switch:
1. Disconnect the switch from the machine harness.2. Connect the 146-4080 Multimeter to the two connector pins, and place the meter in the Ohms position.3. Measure the switch resistance.4. If the system is charged below 2400 kPa 140 kPa, the meter will display less than 1 ohm.5. If the resistance displayed is "OL", and the system pressure is not above specification, replace the switch.6. Every time the switch fails, also test for arc suppressor functionality.7. If the switch is removed, ensure the new switch wires are securely cable-wrapped to prevent vibration damage. The meter can display "OL" if the switch contacts are dirty. The switch contacts can become dirty if the arc suppressor is no longer functioning. The meter will display less than 1 ohm if the switch is not threaded into the A/C system.7X-1076 High Pressure Switch (NORMALLY CLOSED)
To test the switch:
1. Disconnect the switch from the machine harness.2. Connect the 146-4080 Multimeter to the two connector pins, and place the meter in the Ohms position.3. Measure the switch resistance.4. If the system is charged below 2412 kPa 140 kPa, the meter will display less than 1 ohm.5. If the resistance displayed is "OL", and the system pressure is not above specification, replace the switch.6. Every time the switch fails, also test for arc suppressor functionality.7. If the switch is removed, ensure the new switch wires are securely cable-wrapped to prevent vibration damage. The meter can display "OL" if the switch contacts are dirty. The switch contacts can become dirty if the arc suppressor is no longer functioning. The meter will display less than 1 ohm if the switch is not threaded into the A/C system.Testing Arc Suppressors:
For Part Number 106-8704
1. Place multimeter in diode testing mode.2. Place red probe in red or plus terminal of multimeter.3. Place black probe in black or com terminal of multimeter.4. Place the red probe on Pin 2 of the connector, and