Major Generator Components - Generac Power Systems 941-2 Service Manual

INTRODUCTION
Major components of the generator proper are shown
in Figure 1, below. External sheet metal and other
unrelated components are omitted from the drawing
for clarity. These parts are:
Item Description
1 Upper Fan Housing
2 Upper Cooling Fan
3 Permanent Magnet Rotor
4 Rotor Hub
5 Stator Retaining Ring
6 Stator Assembly
7 Stator Adapter
8 Engine
9 Lower Fan & Flywheel
10 Stepper Motor
Figure 1. Exploded View of Generator Proper

MAJOR GENERATOR COMPONENTS

UPPER FAN HOUSING
As its name implies, this component houses and
shields the upper cooling fan. See Figure 1, Item 1.
UPPER COOLING FAN
The Cooling Fan draws air into the generator through
slots in the Upper Fan Housing. It is fastened to and
rotates with the Permanent Magnet Rotor.
PERMANENT MAGNET ROTOR
Sixteen permanent magnets have been affixed to the
Rotor. A starter ring gear is welded to the Rotor. The
Rotor and Hub are balanced at the factory as an
assembly and must be replaced as an assembly.
NOTE: The hub MUST be properly aligned during
reassembly. The mounting bolt, housing opening
and magnet must be properly aligned. In addition,
match marks between the Hub and Rotor must be'
aligned as indicated by an "ALIGN MARKS FOR
BALANCE" decal. During assembly, use care to
avoid damage to the Ignition Sensor.
DANGER! The permanent magnet rotor pro-
!
duces an extremely strong magnetic force.
Use care during installation to avoid pinched
fingers.
Figure 2 Permanent Magnet Rotor Assembly
Section 1.2
Page 1.2-1