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ENGINE AR-COMPLETE 1399831 - Caterpillar

1399831 ENGINE AR-COMPLETE Caterpillar parts 3406E ENGINE
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Caterpillar 1399831 ENGINE AR-COMPLETE

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Compatible equipment models: 1399831:

TRUCK ENGINE  3406E   Caterpillar
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Reinstall T2 secondary fuse. Wires 20GEN, 22GEN and 24GEN remain disconnected from terminals 1, 2 and 3 of isolation transformer assembly T2. Wires 20, 22, 24 and 30 remain disconnected from terminals 20, 22, 24 and 30.Check the winding resistance of isolation transformer assembly T2. The resistance must be as per the Isolation Transformer Assembly T2 Typical Winding Resistance chart.* If the resistance measurements are not correct: Replace isolation transformer assembly T2.* If the resistance measurements are correct:a. Replace VR3 regulator.b. Bench test the regulator. See Bench Test.Problem 2 - Low AC Voltage
Procedure A - Check Engine RPM (Frequency) Procedure B - Adjust Voltage Level With Gain Adjustment Full Counter-ClockwiseThe voltage level adjustment range must be within +10 to -25% of rated voltage.* If the voltage level can not be adjusted as described:a. Check accuracy of voltmeter.b. Go to Procedure C. Procedure C - Check AC Voltage Between Regulator Terminals 20 And 22* If lower than 390 volts: Go to Procedure D.* If lower than 390 volts: Go to Procedure D. Procedure D - Isolate RegulatorDisconnect leads from regulator terminals F1 and F2. Connect a 12 volt automotive type battery across exciter leads F1 (+) and F2 (-). Operate generator at half of the rated speed. Then slowly increase RPM.* If voltage at regulator terminals 20 and 22 is less than 100 volts, shutdown the generator and: a. Check rotating rectifiers CR1-6 (rotating rectifier block).b. Check surge suppression diodes CR7-8 (varistors).c. Check exciter stator L1 resistance between F1 and F2 leads. Exciter stator resistance should be approximately 3 to 5 ohms. For more information, see SR4 Generator Service Manual, SENR3985.* If balanced AC voltage between regulator terminals 20-22-24 that increases with RPM: Go to Procedure E. Procedure E - Isolate AttachmentsConnect exciter stator L1 leads to regulator terminals F1 and F2. Disconnect all attachments such as manual voltage control, remote voltage control, droop transformer, etc. Do not disconnect power transformer PT2 or isolation transformer assembly T2, if provided. If remote mounted

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