GMC 1976 ZEO 6083 Maintenance Manual page 685

24C- 8
ONAN MOTOR GENERATOR
MOTOR GENERATOR REPLACEMENT
REMOVAL
1 . Open access door and support in this position .
2 . Slide unit out of compartment.
3 . Disconnect ground cable (-) at battery.
4. Install lifting eye in manifold on top of unit . A
3/8-16 threaded hole is provided in the manifold for
this purpose.
5. Attach a suitable lifting device into lifting eye,
and remove slack.
Lights flicker inter-
1 . Loose or broken lead/ 1 . Repair broken lead or reconnect
mittently. leads in generator. loose lead .
2. Brushes stuck in 2. Loosen brush and clean
or
turn
holder .
rings in lathe .
Low AC output voltage.
1 . External short circuit 1 . Locate and eliminate short cir-
on line . cuit problem.
2. Generator Overloaded . 2. Remove part of load .
3. Shorted or grounded 3. Test with series test lamp or
circuit in field or arma- ohmmeter and replace if defective.
ture winding.
4. Engine not running 4. Refer to Engine Troubleshooting
properly causing generator guide.
to slow down .
Noisy generator. 1 . Defective bearing in 1 . Replace bearing.
end bell .
Generator overheats 1 . Generator overloaded.
1 . Remove part of load .
2. Windings and parts 2. Clean generator.
covered with oil or dirt .
3. Air intake restricted
3. Take necessary steps to allow
or incoming air too hot.
for proper cooling.
4. Shorted, open or 4. Test with ohmmeter or series
grounded circuit in arma- test lamp and replace if defective
ture or field windings .
5. Air seals are damaged 5. Replace air seals or tape over
or missing. the air leak .
AC output voltage high 1 . Compounding reactor 1 . Remove, test and replace.
with no load connected defective.
and generator running
at 1800 rpm .