PISTON GRP 3S4053 - Caterpillar

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Check the voltage.
Check for maximum voltage between terminals 22 and 23.
Check for the pulse width modulated signal between terminals 19 and 20.Expected Result: The load sharing module is putting out a maximum signal.Results:
OK: Check the engine control module, the wiring to the engine control module or the engine. STOP.
NOT OK: Go to 2.
Check for unequal speed settings.
Verify that the speed settings of all units at no load are identical.Expected Result: Speed settings are equal.Results:
OK: Go to 3.
NOT OK: Adjust the speed settings. If you are unable to adjust the speed settings, go to the governor Service Manual, Service Procedures, "Speed Setting".
Check for unequal load gain voltages.
Check that the load gain settings of all load sharing units are correct. See Testing And Adjusting, "Load Gain - Adjust".Expected Result: The load gain voltages are equal.Results:
OK: Go to 4.
NOT OK: Adjust the load gain voltages. STOP.
Check the phasing of the transformer.
Check the phasing. Refer to Testing And Adjusting, "Phasing - Adjust".Expected Result: The phasing of the transformer is proper.Results:
OK: Go to 5.
NOT OK: Correct the phasing. STOP.
Check for circulating currents between generators.
Check for unequal power factors between generators.Expected Result: The power factors between generators are unequal.Results:
OK: Properly adjust the generator voltage controls. STOP.
NOT OK: Go to 6.
Check for isochronous operation.
Place a jumper between terminals 13 and 14 of the load sharing module.
Operate the engine. Manually apply the load while working in parallel with another unit.Expected Result: The problem has been corrected.Results:
OK: Repair the wiring or the switch. STOP.