Generac Power Systems 53187 - Manual (Page 12)

SECTION 1.3- MAJOR COMPONENTS
(UNITS WITH 15 INCH STATOR) 1
AC Generator Disassembly
BRUSH ACCESS AND REMOVAL Figures 1 & 2);
See Rgure 1. Rem ove the TAPTITE SCREW S
(Item 2) that retain the tw o BRUSH COVERS (Item 33)
to the REAR BEARING CARRIER (Item 4). Rem ove
the BRUSH COVERS (Item 33) to gain access to the
BRUSH HOLDERS (Item 31).
See Figure 2, below . Rem ove W ires No. 1 and 4
from the BRUSHES in both BRUSH HOLDERS. Re­
m ove the TAPTITE SCREW S that retain the BRUSH
HOLDERS to the REAR BEARING CARRIER. Re­
m ove
both BRUSH HOLDERS, along w ith the
BRUSHES
REAR BEARING CARRIER REMOVAL (Figure 1):
Rem ove HEX NUTS (Item 29), LOCKW ASHERS
(Item 27) and STUDS (Item 3) that retain the REAR
BEARING CARRIER (Item 4). To free the REAR
BEARING CARRIER (Item 4) from the ROTOR BEAR­
ING (Item 5), use a soft m allet to tap around the outer
periphery of the BEARING CARRIER. Continue tap­
ping until the BEARING CARRIER is free of the bear­
ing.
STATOR REMOVAL (Figure 1):
The STATOR (Item 7) is "sandw iched" betw een the
ENGINE ADAPTER (Item 23) and the REAR BEARING
CARRIER (Item 4). Carefully rem ove the STATOR
(Item 7). DO NOT PERMIT THE STATOR TO DROP
OR BUMP THE ROTOR DURING REMOVAL.
ROTOR REMOVAL (Figure 1):
Rem ove the four FLANGED NUTS (Item 35) from
STUDS (Item 34). The ROTOR (Item 6), w ith FLEXI­
BLE COUPLING (Item 13) attached, can now be pulled
free of the FLYW HEEL (Item 15).
PARTI
THE REVOLVING FIELD AC GENERATOR
To rem ove the FLEXIBLE COUPLING (Item 13)
from the ROTOR (Item 6), rem ove four HEX HEAD
FLANGED BOLTS (Item 10).
FLYW HEEL REMOVAL (Figure 1):
Rem ove four SCREW S (Item 11) and
LOCKW ASHERS (Item 12). Then, rem ove FLY­
W HEEL (Item 15). If desired, the FAN RING (Item 14)
can
be rem oved by rem oving HEX HEAD
CAPSCREW S (Item 8) and LOCKW ASHERS (Item 9).
ENGINE ADAPTER REMOVAL (Figure 1);
To rem ove AIR RING BAFFLE (Item 17), rem ove
CAPSCREW S (Item 8) that retain
It
to the ENGINE
ADAPTER (Item 23).
Support the engine and rem ove all fasteners that
retain the ENGINE ADAPTER to the BASE ASSEM­
BLY. Rem ove HEX HEAD CAPSCREW S (Item 40) and
LOCKW ASHERS (Item 27). Finally, rem ove the EN­
GINE ADAPTER.
Components Inspection and Testing
GENERAL;
Follow ing disassem bly, generator com ponents
should be cleaned, dryed and inspected or tested.
Never reassem ble a generator having defective parts.'
Keep m ajor parts separated and keep the m ounting
hardw are along w ith the parts they are used w ith. Store
parts in a clean, dry area w here condensation, dirt, or
m oisture w ill not dam age them .
REAR BEARING CARRIER:
The Rear Bearing Carrier (Figure 1, Item 4) is an
alum inum casting. Clean the casting and blow dry w ith
air. Inspect carefully for cracks, obvious dam age. An
insert has been pressed into the Carrier center bore, to
accom m odate the Rotor Bearing. Replace the Rear
Bearing Carrier if the center bore diam eter is not w ithin
the follow ing dim ensions:
BEARING CARRIER CENTER BORE
2.9527-2.9533 Inches (74.999-75.014m m )
ROTOR BEARING:
The rotor bearing is a prelubricated and sealed ball
bearino that requires no additional lubrication for the
life of the bearing. Spin the Rotor bearing by hand and
check it for binding, seizing, roughness, etc. If the
bearing is defective, it m ust be replaced.
The bearing m ay be rem oved from the Rotor shaft
using a bearing puller. A new bearing can then be
pressed onto the shaft. Exert pressing force on the
bearing inner race only- NEVER on the bearing outer/'"~^^
race.
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