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TM 5-2420-222-34
7-1.
ENGINE AC GENERATOR REPAIR (Con’t).
e.
TEST
1.
Install AC generator (50) in automotive generator and starter test stand.
2.
Connect automotive generator and starter test stand jumper wire (54) between output terminal (53) and regulator
terminal (55) to excite field circuit of AC generator (50).
NOTE
For loader backhoes with serial numbers 235786-235999 (55-amp AC generators),
run at 1660 rpm. For loader backhoes with serial numbers 319995-342573 (35-amp
AC generators), run at 1180 rpm.
3.
Adjust automotive generator and starter test stand variable resistor to obtain proper voltage and check output.
(a)
For loader backhoes with serial numbers 235786-235999, output at 1660 rpm should be at least 23 amp at
13-15 v with ambient temperature of 75°F (24°C).
(b)
For loader backhoes with serial numbers 319995-342573, output at 1180 rpm should be at least 5 amp at 13-
15 v with ambient temperature of 77°F (250C).
4.
Run at 3000 rpm and check output.
(a) For loader backhoes with serial numbers 235786-235999, output at 3000 rpm should be at least 45 amp at 13-
15 v with ambient temperature of 75°F (240C).
(b) For loader backhoes with serial numbers 319995-342573, output at 3000 rpm should be at least 26 amp at 13-
15v with ambient temperature of 77F (25C).
TA701342
7-12
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