Posted by SadFarmall on May 01, 2011 at 05:56:26 from (124.180.250.83):
In Reply to: Farmall H starter posted by Chris Sw on April 30, 2011 at 20:21:02:
Gene Bender is right. Changing to an 8 Volt battery does not require any change to the starter motor or generator. The regulator needs to be adjusted so that it charges to a higher voltage and the cut out needs to be adjusted upward too. To change back to 6 volt the regulator just needs to be set at standard 6 volt setting.
You may have a charging issue. It is fine for the ammeter to show 15 or more amps if the battery is discharged. If the battery is fully charged, the charge rate should be low. You can make a very basic check of the regulator with your battery charger. With the tractor running connect the charger to the battery. When the charger is operating, the ammeter reading should drop as the regulator should reduce generator output. If it is not, the regulator is incorrectly adjusted or defective.
As to the starter issue the following are most common:
1). Poor contact at or inside starter switch (check resistance with ohms meter)
2). Defective Field windings in starter motor - replace windings.
3). Dirty commutator or worn/dirty brushes in starter motor - clean and/or replace brushes. Clean commutator segments, especially the gaps between segments. If this fails, segments should be re-cut.
4). Bent armature shaft in starter motor - replace armature
5). Battery defective - test battery under load as a no load test may give a reading between 6 and 7 volts, while a test under load will reveal the battery's true state.
6). Wiring and connections insufficient for the electrical load. A 6 volt starter motor requires a far greater current than a 12 volt equivalent.
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