SWITCH AS-PRESSURE 1245367 - Caterpillar

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(3) Power Resistor 1
(4) Jumper wire
If the measured voltage is not 240 5 VDC, the jumper wire (4) at the power resistor 1 (3) must be adjusted.
Stop the Generator and the engine. Remove the cover for the power resistors and adjust the jumper wire (4). The voltage increases when the lead is moved downward. The voltage decreases when the lead is moved upward.
Start the engine and operate the Generator. Repeat steps B and C. If the voltage is not 240 5 VDC, stop the Generator and the engine. Repeat the procedure to adjust the voltage until the correct voltage is obtained.Proceed to Test Step 9.Test Step 9. DETERMINE IF THE GENERATOR IS OVERHEATED DUE TO POOR VENTILATION
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(1) Ventilation for Outlet Air
(2) Ventilation for Inlet Air and Brushes
Inspect the area around the generator inlet (2) and the outlet (1) ventilation openings for obstructions to the airflow. Remove any obstructions.
Depress the "Drop" switch on the LH joystick. Turn the engine to the OFF position. Ensure that the generator is not rotating.
Remove all ventilation covers from the generator. Inspect the area for dirt accumulation that will reduce airflow and cooling.Expected Result:The generator inlet and outlet ventilation openings are clean.Results:
YES - The generator inlet and outlet ventilation openings are clean and free of obstructions. Proceed to test step 10.
NO - The generator inlet and outlet ventilation openings are dirty and obstructed.Repair: Use low pressure and dry clean compressed air to dislodge the dirt. Collect the dirt with a vacuum cleaner.STOPTest Step 10. CHECK THE GROUND SIGNAL TO THE THERMOSTAT (INSIDE PANEL GP)The generator is not overheated. ECM circuit to J1-70 (wire 201-BK(Black)) is open. Repair the Controller harness or replace the Controller harness. Refer to the latest revisions of Electrical Schematic, UENR6893 and Electrical Schematic , KENR9563 for the complete schematics.
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Control Panel door handle
Depress the "Drop" switch on the LH joystick. Turn off the engine before proceeding.
Open the disconnect switch with the external handle on the enclosure door. Then, open the enclosure door with a screwdriver with your left hand. Hold the external handle in the release position with your right hand.
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Enclosure for the ECM
Set the 146-4080 Digital Multimeter to the lowest resistance scale. Connect one test lead to J1-70 (wire 201-BK(Black)) and the other test lead to Pin 1 of Connector A-C2. Refer to the latest revisions of Electrical Schematic, UENR6893 and Electrical Schematic , KENR9563 for the complete schematics.Expected Result:There is continuity from J1-70 (wire 201-BK(Black)) to Pin 1 of Connector A-C2.Results:
YES - There is continuity. Proceed to Test Step 11.
NO - The circuit is open.Repair: Repair the Controller harness or replace the Controller harness.STOPTest Step 11. CHECK THE GROUND SIGNAL TO THE THERMOSTAT (OUTSIDE PANEL GP)
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Terminals with red housing (indicated by arrow) are connected with the thermostat circuit.
Open the generator connection box. Disconnect the P2 circuit at the terminals between the brown wire (from the internal thermostat) and the green wire (from the Generator connector harness).
Connect one test lead of the