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Allis Chalmers Discussion Forum
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need help again with the wd

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jhk's wd

08-30-2005 20:11:34




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I am starting to figure out the charging system with the help for everyone who has sent me things it has been very helpful. But I need some help again, once I got the tractor starting regularly I have noticed that the generator is extremely hot to the touch almost to hot to touch. Is this normal or not I think not but I might be wrong what could it be? And why? I do know that the relay is closing the connection and I oiled the gen. bearings. Thanks again Guys

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John T

08-31-2005 07:01:14




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 Re: need help again with the wd in reply to jhk's wd, 08-30-2005 20:11:34  
jhk, I dont think the Generator should get so hot you cant lay your hand on it. I wonder whether or not the cutout relay is working properly. It is a Normally Open relay which closes ONLY when the Generators output voltage exceeds that of the battery so it can get to and charge it, but then OPEN otherwise like when the tractors off so it dont reverse discharge the battery.

If the relay is stuck closed, when you shut the tractor off it will discharge the battery and get the Generator very hot cuz its trying to make it turn as a motor but the belt wont allow that. If its stuck when you shut the tractor off an ameter (if wired properly) will swing to discharge and if the belt were removed the Gen would spin.

CHECK OUT THE CUTOUT RELAY Insure its open when the tractors off otherwise the gen will get hot and the batery will discharge.

NOTE: If you have a full fledged 3 or 4 wire Voltage Regulator instead of a 2 wire cutout relay the above still holds true, the relay is located inside the VR (beterrn its BAT and ARM (or GEN) terminals.

Other things: Did you Polarize the Generator once you got things all repaired???? If its not polarized there could be a problem!!!!! !

If the Generators Field were dead grounded it calls for max charge, you might check the wiring from the Gens Field post to see if it wired correct to a light switch or if its a Voltage Regulator to the FLD terminal on the VR and NOT constantly stayign dead grounded. The light switch controllers connects the Field to ground via a resistor for low charge but direct to ground for high charge.

John T Nordhoff in Indiana, retired electrical engineer

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Texas Denny

08-30-2005 20:50:37




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 Re: need help again with the wd in reply to jhk's wd, 08-30-2005 20:11:34  
Well, the generator has 160 to 180F air blowing on it from the radiator. Since 130F is quite uncomfortable, it is quite likely that a generator will be hot to the touch and working normally.

That said, it is also possible that it is working too hard. You need to be sure the generator is connected correctly to the battery (ammeter). Measure the voltage across the battery terminal with a multi-meter. It should be between 13 and 14.5 volts for 12 volt and 6.5 and 7.3 volts for a 6 volt system. If the voltage is over 15 for 12 volt or 7.5 for a 6 volt, your generator is overworking which will lead to premature battery failure and possibly early generator failure.

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