Master Lock MGY5000C - Manual (Page 12)

12 107359-01
PORTABLE DIESEL GENERATOR
R
WARNING: Only a qualified electrical service person should service
and repair generator. Use only factory approved replacement parts.
POSSIBLE CAUSE
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. Clogged spark arrester
3. Defective rotor diode
4. Partial short circuit in winding
5. Defective capacitor
1. Engine speed too high
1. Defective rotor diode
2. Electrical load too high
3. Engine not running properly
OBSERVED PROBLEM
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 electri-
cal load is added
REMEDY
1. Replace capacitor
2. Check resistance of coils (see Electri-
cal Component Specifications, page 13)
3. Replace both diodes on rotor
4. Apply 12-volt battery to capacitor ter-
minals 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 Electri-
cal Component Specifications, page 13)
5. Replace capacitor
1. 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
MAINTENANCE
AND REPAIRS
WARNING: Only a qualified
electrical service person should
service and repair the alternator
on this generator. Use only fac-
tory approved replacement parts.
CAUTION: You must always
run the engine at full speed. Do
not run engine at lower speeds.
At full speed, the engine runs at
3600 RPM under load. The en-
gine must maintain 3600 RPM for
generator to create correct volt-
age. Running engine at lower
speeds will damage generator
and powered items.
CAUTION: Shut off generator
before performing maintenance.
STORAGE
WARNING: Remove all fuel
from fuel tank before storing gen-
erator. Store fuel in approved con-
tainer. Store fuel in a well-vented
area free of open flames or sparks.
IMPORTANT: Keep generator level when
servicing. Never turn generator upside down
or stand it on end to service.
Note: We supply the engine owner’s manual
with generator. Refer to that manual for
questions concerning engine maintenance
and repairs.
Non-engine parts require little maintenance.
Keep generator clean. Use a damp cloth to
clean outside surfaces. Never use water to
clean generator. Water can cause damage to
internal parts. Use vacuum to clean air inlet
and outlet louvers of alternator.
WARNING: The muffler be-
comes very hot during operation.
The muffler remains hot for a
while after shutdown. Let engine
cool before storing.
IMPORTANT: Keep generator level while
in storage. Never store generator upside
down or standing on end.
Note: We supply the engine owner’s manual
with generator. Refer to that manual for
questions concerning engine storage.
Cover and store generator in a clean, dry
place. Do not expose generator to extreme
high or low temperatures during storage.
www.desatech.com
TROUBLESHOOTING
Note: For additional help, visit DESA
International’s technical service web site
at
www.desatech.com .
Note: See engine owner’s manual for en-
gine troubleshooting.