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Cummins/Onan — 6-1

For these Cummins/Onan models: MCGBA, MCGCA, MCGDA, MCGDB, MCGGA, MDGDA, MDGDB, MDGDC, MDGDD.

Applies to: Cummins Onan Mcgba, Cummins Onan Mcgca, Cummins Onan Mcgda, Cummins Onan Mcgdb, Cummins Onan Mcgga, Cummins Onan Mdgda, Cummins Onan Mdgdb, Cummins Onan Mdgdc, Cummins Onan Mdgdd

Procedure

  1. 6. Adjustments OUTPUT VOLTAGE ADJUSTMENT Output voltage can be adjusted plus or minus five percent of nominal voltage by the adjustment screw on the back of the power supply outlet box (Figure 6-1). Call your distributor if the required voltage can- not be obtained by this adjustment. VOLTAGE REGULATOR ACCESS COVER VOLTAGE ADJUSTMENT SCREW RESETTABLE FIELD CIRCUIT BREAKER FIGURE 6-1. OUTPUT VOLTAGE ADJUSTMENT Redistribution or publication of this document, by any means, is strictly prohibited. 6-2 MECHANICAL GOVERNOR Output frequency (50Hz or 60Hz) can be adjusted by turning the governor “idle” and “speed” adjusting screws while the engine is running at its normal op- erating temperature under full load. Adjust droop to within five percent of nominal frequency (3 Hertz for
  2. 60 Hertz sets and 2.5 Hertz for 50 Hertz sets). Check operation under various loads and increase droop if the governor hunts. Readjust full-load fre- quency if droop is adjusted. SPEED ADJUSTING SCREW DROOP ADJUSTING SCREW THROTTLE LEVER LOCK NUT LOCK NUT FUEL STOP BOSS FIGURE 6-2. MECHANICAL ENGINE GOVERNOR Redistribution or publication of this document, by any means, is strictly prohibited.

Source: manual:960-0151B Onan MCGBA CA GA DA DB DA DB DC DD Operators Manual (6-2000) .pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.