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TM 5-2420-222-34
7-1.
ENGINE AC GENERATOR REPAIR (Con’t).
NOTE
Steps 17 through 22 apply only to loader back hoes
with serial numbers 319995-342573.
17.
Using soldering gun and long round nose pliers, unsolder and
separate three connecting leads (41, 44, and 47) and six
winding ends (43, 45, 46, 48, 49, and 42) on stator (14).
18.
Using multimeter, check for continuity between winding ends
(42 and 46, 43 and 48, and 45 and 49). If open circuit exists,
stator (14) is defective and must be replaced.
19.
Using multimeter, check for continuity between stator (14) and
three winding ends (46, 48, and 49). If continuity or grounded
winding exists, stator is defective and must be replaced.
20.
Using multimeter, check for continuity between winding ends
(46 and 48, 46 and 49, and 48 and49). If continuity or short
exists between windings (46, 48, and 49), stator (14) is
defective and must be replaced.
SERIAL NUMBERS 319995-342573
21.
Using long round nose pliers and soldering gun, twist and solder together two windings ends (46 and 48) and
connecting lead (47).
22.
Repeat step 21 for winding ends (42 and 49) and connecting lead (41), and winding ends (43 and 45) and
connecting lead (44).
23.
Using automotive generator and starter test stand, check two
slip rings (28 and 29) on rotor (15) for field current draw.
(a)
For loader backhoes with serial numbers 235786-
235999, rotor field current draw should be 1.85-2.25
amp at 10 v when surrounding air temperature is 75°F
(24C).
(b)
For loader backhoes with serial numbers 319995-
342573, rotor field current draw should be 2.0-2.6 amp
at 10 v when surrounding air temperature is 75F (24C).
24.
If field current draw is too high, windings are shorted and rotor
(15) is defective. If no field current draw exists, windings are open and rotor is defective.
25.
Using multimeter, check two slip rings (28 and 29) on rotor (15) for field circuit resistance.
(a)
For loader backhoes with serial numbers 235786-235999, resistance should be 5.0 ohms.
(b)
For loader backhoes with serial numbers 319995-342573, resistance should be 4.0-5.5 ohms.
TA701338
7-8
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