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5. Look for score marks on the outside
diameter of the armature core caused by
rubbing. (This could indicate bearing or
assembly problems and should be
investigated.)
PMG INSPECTION
PMG STATOR
1. Clean dust and dirt from the PMG stator
winding.
Figure 6-36
2. Check PMG stator for a loose, frayed, or
burnt winding. Measure winding resistance
and insulation resistance. (See section 8.)
Repair or replace as necessary. Contact
Marathon Electric for special winding
procedures and materials.
3. Look for score marks in the bore caused
by rubbing.
PMG ROTOR
WARNING
THE PMG ROTOR USES VERY STRONG
MAGNETS. KEEP AWAY FROM IRON
AND STEEL PARTS THAT COULD BE
DRAWN TO THE MAGNETS AS WELL AS
OTHER COMPONENTS THAT CAN BE
DAMAGED BY MAGNETIC FIELDS.
Figure 6-37
1. Clean dust and dirt from the PMG rotor.
2.Check to be sure all magnets are tightly
bonded to the PMG rotor.
3.Check the bore and keyway of the PMG
rotor for burrs or corrosion.
4.Look for score marks on the outside
diameter caused by rubbing. (This could
indicate bearing or assembly problems and
should be investigated.)
5. Inspect snap rings and loading spring,
replace as required.
MAIN ROTOR INSPECTION
BEARING
1. Check the bearing for damage or wear.
Clean old grease from the bearing cap, and
fill bearing cap grease cavity 1/3 to 1/2 full
of r Chevron SRI (or equivalent).
CAUTION: If the bearing needs to be
removed any reason, always install a new
bearing.
2. If the bearing is to be replaced, remove
with suitable puller. (Figure 6-38.)
37
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