Onan UF Series Instruction Manual And Parts Catalog page 47

16 S E R V I C E D I A G N O S I S
POSSIBLE CAUSE REMEDY
OVERHEATING OF GENERATOR (Cont.)
Excessive arcing at the brushes. See "Poor Commutation" above.
Unequal air gap between poleshoe Shim up poleshoe until air gaps are
and armature. equal.
Generator blower scroll installed Reverse blower scroll position,
in wrong position.
GENERATOR NOISY
Generator loose on base. Tighten mounting bolts.
Worn or defective bearing. Replace worn parts. Check align-
ment.
Field pole rubbing armature. Tighten field poles to frame.
GENERATOR RUNS BUT DOES NOT PRODUCE CURRENT
Brushes not contacting com- Free brushes in holders. Assemble
mutator. brushes and springs correctly.
Open, short or grounded c i r - Test windings and repair or replace
cuit in generator. defective parts.
Generator line leads broken Tighten connections and replace
or loose. broken leads.
Generator armature rotating 1. Correct direction of rotation.
in the wrong direction. 2. Or, connect wires, polarize
field and reinstall scroll to
agree with direction of rotation.
LOW VOLTAGE OUTPUT OF GENERATOR
Speed low because of loose, Adjust belt tension,
slipping belts.
Generator brushes not in Turn brush ring until the identifying
neutral position. marks are aligned correctly.
External short circuit on line. Test generator with line wires dis-
connected.