Kohler PRO6.4, Service Manual

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Troubleshooting
8 TP-7088 6/17 KohlerPower.com
Replace AVR
With engine stopped, replace AVR with a
new AVR. Start engine and adjust trimmer
on back of AVR. Test terminal voltage.
Voltage should be between 95-135V. If
voltage is met, original AVR is not adjusted
properly or faulty. Replace as necessary. If
voltage not met, check circuit breakers and
receptacles.
Unit Item
Generator Spec.
REMARK
PRO6.4/6.4E PRO9.0/9.0E
Main Winding
Red-Blue 0.27 Ω ±10% 0.13 Ω ±10%
Red-White
(PRO9.0E)
White-Black 0.27 Ω ±10% 0.13 Ω ±10%
Field Winding Between slip ring 46.6 Ω ±10% 56.4 Ω ±10%
Exciter Winding Blue-Blue 1.60 Ω ±10% 1.02 Ω ±10%
DC Winding Orange-Orange 0.10 Ω ±10% 0.08 Ω ±10%
Brush Length 9mm
Service limit:
5mm
Figure 1 Generator Speci fi cations
NOTE: Alternator should not be in contact with panel, AVR, etc during above resistance tests. Alternator should be
tested at room temperature.