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MF-35 Alternator Bearing Noise

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Craig in New Ze

01-22-2001 12:54:33

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Hi folks,
I have an original FE-35 with what I believe is an alternator as opposed to a generator (how could I confirm this?). The problem is that there is a rumbling/chattering sound like pebbles rolling around in a drum coming from the alternator. I imagine this would be bearing noise?. What are my options - can I pull the unit apart, can the bearings be re-greased, should they be replaced, would it be more cost/time efficient to simply get a new (second-hand) generator?. Grateful for any help or suggestions as always thanks.

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Bill Stanley

01-24-2001 04:47:54

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Re: MF-35 Alternator Bearing Noise in reply to Craig in New Zealand, 01-22-2001 12:54:33

Occasionally I hear a similar rattling noise in the general area of the generator. Changing the throttle position changes the noise and it goes away. Since I have had the generator off and apart several times now while chasing a charging problem I am sure the bearings are good. I think the most likely cause of the noise in my case is the governor which is close to the generator.

Sometimes simply putting oil in the oil flip up cups will stop a bearing chatter. These things do need oil ocasionally. My generator has two oil cups, one on both ends. Why don't you simply loosen the fan belt and move the generator pulley left to right checking for side play. It is usually best on the wallet to try the cheap and simple things first.

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George Gray

11-19-2003 18:09:51

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Re: Re: MF-35 Alternator Bearing Noise in reply to Bill Stanley, 01-24-2001 04:47:54

Hi from NZ.
I Don't know tractors specifically, but an Alternator is typically short and fat, and a generator (Dynamo) long & skinny. If Lucas, the usual pommie sort there will be a regulator box somewhere on the vehicle too; usually on the firewall of cars. This has the connections in screw connectors at the bottom and a brown or black bakelite (78rpm record stuff) lid, with a spring wire clip over the top. Don't mess if you don't know. If unsure remove the battery cable that goes to the bodywork or chassis (ALWAYS disconnect this one first & reconnect LAST) then the electrics are dead. Now you can remove the unit and take it into someone who knows.
ALSO most pommie vehicles pre 1967 or so (Hillman Hunter era) had a generator and POSITIVE EARTH, and after that an alternator and NEGATIVE earth. SO look which battery terminal is hooked to the chassis. That said it IS possible to reverse the polarity of a generator-based system, for example to install a modern radio. Alternators have a diode lump to turn the AC current generated inside to DC for the battery and the rest of the vehicle electrics. There is usually a microchip as regulator too, so no external box needed. ALWAYS disconnect an alternator before arc-welding on a vehicle or else you will fry it.
Hope this helps.
Oh join a club. We are in the Jowett club (Bradford, Javelin, Jupiter etc) and the expertise there is invaluable.
Regards
George Gray
Maungaturoto New Zealand
[email protected]

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