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Dayton Operating Instructions and Parts Manual
19
Model 4W315C
Version B - For Reduction G016.J
®
107358
Troubleshooting Chart
Only a qualified
electrical service
person should service and repair
generator. Use only factory approved
replacement parts.
Corrective Action
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. Clean arrester. See engine owner’s
manual
3. Replace both diodes on rotor
4. Check resistance of coils (See “Electrical
Component Specifications,” page 2)
5. 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
1. Add fuel to fuel tank
2. Move fuel cock to “O” (open) position
3. See qualified Yanmar service person
4. Move speed control lever to START
position
5. Add lube oil to engine
6. See qualified Yanmar service person
7. When starting engine with recoil starter,
pull starter rope quickly and firmly. You
must pull starter rope all the way out
8. Clean spark arrester. See “Cleaning the
Spark Arrester,” page 16
9. Loose battery connections, corrosion on
battery terminals, or battery dead
Symptom
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
Engine will not start
Possible Cause(s)
1. Defective capacitor
2. Winding short circuit or loose connec-
tions
3. Defective rotor diode
4. Loss of residual magnetism
1. Engine speed too low
2. Clogged spark arrester
3. Defective rotor diode
4. Partial short circuit in winding
5. Defective capacitor
Engine speed too high
1. Defective rotor diode
2. Electrical load too high
3. Engine not running properly
1. Fuel level too low
2. Fuel cock not in “O” (open) position
3. Diesel fuel not reaching the fuel
injection pump or nozzle
4. Speed control lever not in START
position
5. Lube oil level not correct
6. Fuel injection nozzle not working right
7. Recoil starter not pulled quickly and
firmly enough
8. Spark arrester clogged by carbon
9. Battery not discharging
NOTE: See engine owner’s manual for
engine troubleshooting.