Onan NHE Service Manual

Testing Armature lor Grounds: Touch one ohmmeter
lead to a commutator bar and then touch the other lead
to armature shaft and core laminations. Alow resistance
reading indicates a grounded armature. Replace
grounded armature with a new part. See Figure
3.
Testing for Opens: Touch one ohmmeter lead to a
commutator bar and then systematically touch the other
lead to each
of the remaining commutator bars. A high
resistance reading indicates an open circuit between
the commutator bars and armature windings. Replace
an open armature with a new part.
Brush Inspection: Measure brushes (Figure 5) and
replace
if worn less than .425 inch.(ll mm).
ES-1614
FIGURE 3.
TESTING ARMATURE FOR GROUNDS
Testing for Shorts: Use a growler (Figure 4) for locating
shorts in the armature. Place armature in growler and
hold a thin steel blade (e.g. hacksaw blade) parallel to
the core and just above the armature while slowly rotat-
ing armature in growler. A shorted armature will cause
the blade to vibrate and be attracted to the core. Replace
a shorted armature with a new part.
HACK SAW
BUQE m
0.425 INCH
E3-1610
FIGURE 5. BRUSH INSPECTION
ES-1615
FIGURE 4. TESTING ARMATURE FOR SHORTS
2
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by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.

Onan NHE Specifications

General

Brand	Onan
Model	NHE
Category	Portable Generator
Language	English