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Dayton Operating Instructions and Parts Manual 3WY47, 3W735B, 3W736C, 3WY44, 3TE27A, 3WY45, and 3WY46
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Dayton Professional-Duty
Electric Generators
®
Troubleshooting Chart
NOTE: See engine owner’s manual for
engine troubleshooting.
Only a qualified
electrical service
person should service and repair
generator. Use only factory approved
repair parts.
Corrective Action
1. Fill tank with fresh fuel
2. Fill engine crankcase with oil to the full
mark on dip stick
1. Replace capacitor
2. Check resistance of coils (see “Electrical
Component Specifications,” page 2)
3. Replace both diodes on rotor
4. Apply 12-volt battery to capacitor
terminals for 2-3 seconds
1. Set engine speed to 3720 RPM (62 Hz)
with no load
2. Replace both diodes on rotor
3. Check resistance of coils (see “Electrical
Component Specifications,” page 2)
4. Replace capacitor
Set engine speed to 3720 RPM (62 Hz)
with no load
1. Replace both diodes on rotor
2. Do not overload generator
3. Contact an authorized engine service
center
Symptom
Engine will not start
No voltage when starting
generator with no electrical
load
Voltage is less than normal
voltage with no electrical load
Voltmeter reading more than
10% high with no electrical
load
Voltmeter reading correct with
no electrical load, but more
than 10% low when electrical
load is added
Possible Cause(s)
1. Insufficient fuel
2. Oil level low
1. Defective capacitor
2. Winding short circuit or loose
connections
3. Defective rotor diode
4. Loss of residual magnetism
1. Engine speed too low
2. Defective rotor diode
3. Partial short circuit in winding
4. Defective capacitor
Engine speed too high
1. Defective rotor diode
2. Electrical load too high
3. Engine not running properly