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Stator check
Figure 7-7. Alternator bench testing.

TM-5-4310-354-14 Compressor Rotary; Air Skid Mounted; Diesel Engine 125 CFM 100 PSIG (Davey Model 6M125) Manual
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TM 5-4310-354-14
(2) If the slip rings are dirty, they may be
cleaned and finished with 400 grain, or finer,
polishing cloth.
CAUTION
The rotor must be rotated when
cleaning or finishing the slip rings so
that  they  are  cleaned  evenly.
Cleaning by hand without spinning
the rotor may result in flat spots on
the slip rings causing brush noise.
TS5-4310-354-14/7-6
Spin the rotor and hold polishing cloth
against the slip rings until they are clean.
Slip rings which are rough or out of round
Figure 7-6. Drive end bearing assembly.
should be trued in a lathe to 0.002 inch
(0.051 mm) maximum indicator reading.
a tube or collar that just fits over the outer
Remove only enough material to make the
race.  Fill cavity between bearing and
slip rings smooth and round. Then, finish
retainer plate with lubricant equal to
with 400 grain, or finer, polishing cloth.
Delco-Remy No. 1948791.
Blow away all polishing dust with clean,
dry compressed air.
(2) Reassemble inside collar (34, figure 7-1)
and a new retainer plate (33) if the felt
(3) Inspect brushes for cracks, chips, and
seal is hardened, worn, or otherwise
excessive wear.  Replace the brush and
defective. Attach with three screws (32).
holder assembly when brushes are worn
to less than 1/4-inch (6.35 mm).
NOTE
(4) Inspect brush springs for cracks, breaks,
At reassembly refer to figures 7-3 and
distortion, or any other defect.
7-4,  as  well  as  figure  7-1,  for
reassembly order of parts.
(5) Inspect bearings for freedom of rotation,
any gritty action, wear, or any other defect.
(3) Reassemble a new bearing (30) in slip
ring end frame (31) using a flat plate over
(6) Inspect rotor bearing journals for wear, scoring,
the bearing and press in from the outside
pitting, or any other defect.
toward the inside of the frame until bearing
is flush with outside of end frame. Support
(7) Check  all  parts  for  cracks,
breaks,
the inside of the end frame with a hollow
distortion,  damaged  threads,
burned
cylinder to prevent breakage of the frame.
insulation, or any other defects.
Use  care  to  avoid  misalignment  of
bearing.  Reassemble terminal package
(8) Repair of the alternator, other than that
(29), refer to figure 7-4, for order of parts.
detailed  above,  is  limited  to  the
replacement of defective parts, or the
(4) Reassemble regulator (28, figure 7-1),
entire assembly.
brush spring (27), brush and holder (26),
insulator (25), insulated screw (24), two
e. Reassembly.
Reassemble  the  alternator
lock washers (23) and two screws (22).
assembly in the reverse numerical sequence shown in
figure 7-1 and the following detailed instructions.
(5) Reassemble capacitor (21) into capacitor
bracket (20) ; attach with screw and lock
(1) Reassemble  grease  slinger  (36)  and
washer (19), lock washer (18), and screw
bearing (35) into drive end frame (7) as
(17).
shown in figure 7-6. Press bearing in with
7-6






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