Marathon — Starting Up the Generator Set
Operation
From a Marathon service manual — check it applies to your exact model before use.
Before you start
- Permanent equipment damage can be caused by idling the engine between 650 and 1400 generator RPM.
- Remove regulator fuses before engine start-up and adjustment when idling is required.
- Do not leave the battery connected after flashing; observe proper polarity.
Procedure
- Disconnect generator output from the load. Open the circuit breaker.
- Start the prime mover and adjust to proper speed (1800 RPM for 60 Hz, 1500 RPM for 50 Hz).
- Adjust voltage to required value with the rheostat in the voltage regulator.
- If no voltage is produced, flash the field by applying battery voltage to the regulator output terminals while at a standstill.
- Close the circuit breaker and apply the load.
- Before stopping the engine, trip the circuit breaker.
Specs & values
- 1800 RPM for 60 Hz
- 1500 RPM for 50 Hz
Source: Marathon service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.