PUMP GP-GOV, FUEL INJ & TFR 7C0795 - Caterpillar

Electrical Power
Make sure that the control box's "ON/OFF" switch is in the "ON" position. Observe the power light on the control box.If the power light is not on, make sure that the main power supply and the 24 V supply are ON.If the power supplies are ON but the power light on the control box is OFF, troubleshoot the electrical system.Fuses
Inspect the fuses for the main power supply. Inspect the fuses in the control box. Replace any blown fuse.If the fuse is blown again, troubleshoot the electrical system.Flow Switch
If there is a problem with the flow switch, the flow switch can improperly activate the time delay relay and the power supply will be removed from the pump motor.Make sure that the flow switch is operating correctly. Inspect the flow switch and clean the flow switch. For instructions, refer to Systems Operation Section, "Maintenance".Replace the flow switch, if necessary.Impeller Clearance or Assembly
Disassemble the pump according to the instructions in Systems Operation Section, "Maintenance". Inspect the moving parts for damage. Replace the impeller, if necessary. Make sure that the clearance between the impeller and the housing is correct.The Pump Motor is Overheating
Probable Causes
Obstruction in the supply lines and/or return lines
Inadequate fluid flow
Problem with the main power supply
Problem with a thermostat
Problem with the motor's protective switch
Problem with the pump shaft or the motor's bearingRecommended Repairs
Obstruction in the Lines
Restriction of the suction lines and/or the return lines causes excessive resistance to the pumping. The pump motor will work too hard and the motor will overheat. Inspect the lines for obstructions and remove any restriction.Fluid Flow
The pump is partially cooled and lubricated by the fluid flow. An inadequate fluid flow can result in overheating of the pump motor. If a problem with the fluid flow is suspected, refer to "The Flow of Fluid is Inadequate".Main Power Supply
The pump motor must have the correct voltage and frequency. Otherwise, the motor will attempt to compensate for the inadequate supply and the motor will overheat. Check the quality of the main power supply and compare the data to the motor's rating. Make sure that the main power supply is correct.Thermostat
The thermostat's contactor is normally open. If the temperature is less than the thermostat's rating, the thermostat's contactor closes in order to energize the heating element. If the temperature becomes greater than the thermostat's rating, the thermostat opens again.To verify whether there is a problem with the thermostat, measure the thermostat's resistance at a temperature that is less than the thermostat's closing temperature. If the resistance is greater than 200,000 ohms, the contactor is open.Continue to measure the thermostat's resistance and increase the temperature to the thermostat's closing temperature. If the resistance is less than 5 ohms, the contactor is closed.Continue to measure the thermostat's resistance and increase the temperature to the thermostat's opening temperature. If the resistance is greater than 200,000 ohms, the contactor is open.For the thermostats' operating temperatures, refer to Systems Operation Section, "System Components".If the thermostat fails to operate correctly, replace the thermostat.Motor's