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TM 5-2420-222-34
7-1.
ENGINE AC GENERATOR REPAIR (Con’t).
NOTE
Semiconductor device diodes can be checked with
or without stator connecting leads soldered in place.
10.
Using multimeter, check diodes (12) for high and low
impedance readings. If high or low readings are identical for
all six diodes, semiconductor device (13 or 17) is okay. If
readings vary slightly, semiconductor devices are defective
and should be replaced.
NOTE
Loader backhoes with serial numbers 235786-235999 have Wye-connected stator
circuits. Loader backhoes with serial numbers 319995-342573 have Delta-
connected stator circuits.
11.
Inspect windings (39) on stator (14 for shorts and damaged or
burned insulation.
NOTE
Steps 12 through 16 apply only to loader backhoes
with serial numbers 235786-235999.
12.
Using soldering gun and long round nose pliers, unsolder and
separate three winding ends (34, 36, and 38) on stator (14).
SERIAL NUMBERS 235786-235999
13.
Using multimeter, check for continuity between six winding ends (34 and 40, 35 and 36, and 37 and 38). If open
circuit is present, stator (14) is defective and must be replaced.
14.
Using multimeter check for continuity between stator (14) and three winding ends (34, 36, and 38. If continuity or
grounded winding exists, stator is defective and must be replaced.
15.
Using multimeter, check for continuity between winding ends (34 and 36, 36 and 38, and 34 and 38). If continuity
or short exists between winding (34, 36, and 38), stator (14) is defective and must be replace.
16.
Using soldering gun and long nose pliers, twist and solder together three windings (34, 36, and 38).
TA701337
7-7
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