Cummins/Onan — THIS PAGE LEFT INTENTIONALLY BLANK

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. 4-1
2. 4. Troubleshooting The generator set has sensors that continuously monitor the engine for low oil pressure, high engine temperature and high exhaust temperature of a wa- ter cooled exhaust. If an abnormal condition occurs, the fault circuit breaker will trip and the engine shuts down. After the problem is corrected, reset the fault circuit breaker to restart the generator set. Table 4-1 describes the operation of the fault condi- tion system (including optional features) and lists troubleshooting procedures. SAFETY CONSIDERATIONS High voltages are present within the control box and generator output box when the generator is run- ning. Do not open the control box or generator out- put box while the set is running. WARNING Contacting high voltage compo- nents can cause severe personal injury or death. Keep control and output box covers in place during troubleshooting. Generator set installations are normally designed for remote starting. When troubleshooting a set that is shut down, make certain the generator set cannot be accidentally restarted. To prevent accidental starting, always remove the negative battery cable from the set starting battery. CAUTION Always disconnect a battery char- ger from its AC source before disconnecting the battery cables. Otherwise, disconnecting the cables can result in voltage spikes high enough to damage the DC control circuits of the set. WARNING Accidental starting of the generator set while working on it can cause severe per- sonal injury or death. Prevent accidental start- ing by disconnecting the starting battery cables (negative [–] first). Arcing can ignite the explosive hydrogen gas given off by batteries, causing severe personal injury. Arcing can occur if the negative (–) bat- tery cable is connected and a tool being used to connect or disconnect the positive (+) battery cable accidentally touches the frame or other grounded metal part of the set. To prevent arc- ing, always remove the negative (–) cable first, and reconnect it last. When a fault condition occurs during operation, fol- low the procedures in Table 4-1 to locate and cor- rect the problem. For any symptom not listed, con- tact an authorized service center for assistance. 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.