Generac 86640 - Manual (Page 13)

STATOR ASSEMBLY;
Clean the Stator can exterior surfaces with a soft brush
or cloth. Use clean, dry, low pressure air (25 psi maximum)
to clean the Stator.
Use an ohmmeter or a volt-ohm-milliammeter (VOM) to
test the resistance of Stator AC power windings and excita­
tion (DPE) windings. See Section 1.6.
Use an insulation resistance tester (megohmmeter or
hi-pot tester) to check the condition of stator insulation (see
Section 1.3). If stator insulation is breaking down, dry the
stator by blowing warm, dry air across it for several hours. Do
NOT exceed 185* F. (85‘ C.). If insulation resistance Is still
low after drying, replace the stator assembly.
BLOWER HOUSING:
Clean the cast aluminum blower housing. Inspect the
housing carefully for cracks, damage.
FLEX PLATE;
The flex plate is of 16 gauge steel. Clean the flex plate,
then inspect it carefully for cracks, damage, wear. Check all
holes for elongation and wear.
ROTOR ASSEMBLY;
Use clean, dry, low pressure air (25 psI maximum) to
clean the rotor. Use a volt-ohm-mllliammeter ^OM) to check
the resistance of Rotor windings (Section 1.6).
Check the Rotor bearing for binding, seizing, roughness.
The bearing is pre-lubricated and sealed; It requires no addi­
tional lubrication for the life of the bearing. If the bearing Is
defective, replace the Rotor assembly.
Check the keyway in the Rotor’s tapered shaft for wear
or damage. Also, inspect the drive key.
Inspect the slip rings. A dull or tarnished appearance
indicates oxidation on the slip ring surface. If necessary,
clean the slip rings with fine sandpaper. DO NOT USE ANY
METALLIC GRIT TO CLEAN SLIP RINGS.
Use an Insulation resistance tester (megohmmeter or
hi-pot tester) to check fhe Rotor for Insulation breakdown. If
insulation resistance Is low, dry the Rotor with heated, dry air.
DO NOT EXCEED 165* F. (85 C.). If the insulation resistance
is still low after drying, replace the Rotor assembly.
FAN AND RING GEAR ASSEMBLY:
During factory assembly, the ring gear is heated to 400*
F. and the blower fan is installed. The entire assembly is then
statically balanced. If the fan and ring gear must be replaced,
replace It as an assembly.
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