Cummins/Onan EGMBT (P4500) Engine Engine

• NO DC OUTPUT
  Cause: · Tripped DC circuit breaker
  Fix: 1. Disconnect the battery. 2. Reset the circuit breaker. 3. Have the battery tested for shorts and, if necessary, replace the battery.
• NO AC OUTPUT
  Cause: · Tripped AC circuit breaker
  Fix: 1. Remove all loads. 2. Reset the circuit breaker. 3. Check loads for defects and make sure the total load does not exceed the generator set rating.
• ENGINE WON'T START
  Cause: · Out of fuel · Fuel value closed · Loose spark plug cable · Defective spark plug · Low oil level
  Fix: 1. Make sure the fuel tank is full. 2. Make sure the fuel valve is fully open. 3. Make sure the spark plug cable is connected. 4. Remove and clean the spark plug; replace it if necessary. 5. Check the oil level and add oil as necessary.
• ENGINE SURGES
  Cause: · Loose spark plug cable · Faulty spark plug · Generator set not level · Dirty fuel strainer
  Fix: 1. Make sure the spark plug cable is properly connected or have it serviced, if damaged. 2. Remove and clean or replace the spark plug. 3. Make sure the generator set is on a level surface. 4. Check the fuel strainer and clean if necesary.
• ENGINE STOPS
  Cause: · Out of fuel · Low oil level
  Fix: 1. Make sure the fuel tank is full. 2. Check the oil level and add oil as necessary.
• ENGINE DOES NOT CRANK (ELECTRIC START)
  Cause: · Low battery · Bad battery connection
• ENGINE CRANKS SLOWLY (ELECTRIC START)
  Cause: · Low battery · Bad battery connection · Engine oil is too heavy · Load is connected
  Fix: 1. Service the battery if necessary. 2. Clean and tighten battery connections. 3. Check the engine oil and, if too heavy, replace with recommended oil. 4. Disconnect the load before starting.
• BLACK EXHAUST
  Cause: · Choke stuck in the closed position · Dirty air cleaner · Rich fuel mixture
  Fix: 1. Make sure the choke is open. 2. Clean the air cleaner.

Compiled from service & troubleshooting documentation across every generator set that uses the Cummins/Onan EGMBT (P4500).

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.

• 1
• 10-2009
• Introduction
• 5
• 10-2009
• 7
• 10-2009
• 9
• 11
• 10-2009
• 15
• 10-2009
• 17
• 10-2009
• 19
• 10-2009
• RIGHT AWAY. See a doctor. You could have carbon monoxide poisoning.
• 8-2009
• Introduction
• 5

Step-by-step procedures compiled from the Cummins/Onan service manual for this engine.