AP-1000D, AP-1055D, AP-655C, BG-2255C, BG-2455D and BG-260D Asphalt Pavers Caterpillar

See the table for "Resistor, Sender and Solenoid Specifications". This table is located in the Electrical System Schematic for the machine that is being serviced.

Test Step 1. CHECK THE TEMPERATURE SENDER.

1. Disconnect the sender from the machine harness.

2. Measure the resistance between the two contacts of the sender.

The following data should be the correct approximate resistance for the AP-655C sender:

• 54.4°C (130.0°F) at 560 to 716 Ohms

• 110°C (230.0°F) at 72 to 82 Ohms

The following data should be the correct approximate resistance for the AP-1000D and AP-1055D sender:

• 54.4°C (130.0°F) at 302 to 308 Ohms

• 110°C (230.0°F) at 49 to 53 Ohms

These values are not exact, but the values should be used as guidelines for troubleshooting.

Expected Result:

The resistance of the temperature sender is within specifications.

Results:

• OK - The resistance of the temperature sender is within specifications. Stop.

• NOT OK - The resistance of the temperature sender is NOT within specifications. The temperature sender has failed.

  Repair: Replace the sender.

  Stop.