GMC 1976 ZEO 6083 Maintenance Manual page 684

ONAN MOTOR GENERATOR 24C- 7
GENERATOR TROUBLE DIAGNOSIS
Engine starts hard . 1 . Improper adjustment . 1 . Set idle & power needles at 1
turn open . After engine starts and
runs, set for optimum performance.
2 . No fuel in carburetor . 2. Check carburetor drain valve. If
no fuel in bowl clean tank filter
and carburetor . Check electric fuel
pump operation, check electric
solenoid valve.
3 . Choke valve not 3 . Check controls for proper travel .
closing.
Governor Surge 1 . Throttle shaft and 1 . Remove and replace shaft if worn .
valve binding. Clean carburetor body . Reassemble
throttle shaft assembly into carbu-
retor body as far as possible . Hold
firmly in place in this position
while assembling throttle valve.
Make certain valve does not bind in
throttle bore when opening and
closing throttle .
Lean carburetion. 2. Adjust carburetor .
Problem Possible Cause Correction
No AC output voltage. 1 . Blown fuse or cir-
1 . Replace fuse or reset breaker
cuit breaker.
and look for cause.
2. Disconnected wire or
2. Reconnect wire or wires.
lead on brushes, bridge
rectifier or reactor
assembly .
3. Brushes not making
3 . Check brush springs for free
- contact with collector
movement or brushes which may be
rings.
excessively worn .
4. Open, grounded or 4. Test with series test lamp and
short circuit in field repair or replace as necessary.
or armature winding.
5. Defective bridge rec- 5 . Test with ohmmeter and replace
tifier assembly. if defective.
6. Bridge rectifier as-
6. Reinstall making sure marks on
sembly installed wrong in case and rectifier match.
its case .