50a alternator pulley

Danielfire50 · Feb 20, 2020

Does anyone know what size pulley was originally used on the alternator of a ad4.203 Perkins. Im in the process of replacing the fan belt on my 50a and realised the alternator does not have the right pulley on it.

Jim.ME · Feb 22, 2020

What tractor? What makes you say it is wrong (OD of pulley , shaft hole ID, width, offset))? Do you know if unit was originally an alternator or a conversion from a generator?

Danielfire50 · Feb 22, 2020

Its an 1973 industrial Massey Ferguson
50a. It came with a delco alternator.
When I went to replace the belt i
realized the alternator had a pulley for
a 3/8" wide belt while the rest of
pulleys and the new belt is 1/2" wide. So
1/2" wide pulleys for the alternator are
available but what od pulley would have
been used.

Jim.ME · Feb 22, 2020

Get one the same or a bit smaller OD than the one on it. Smaller will make it charge at lower rpms. Your description sounds like someone got a replacement alternator at some point in its life and didn't swap the pulley over. 3/8 is the common width for cars and trucks.

Danielfire50 · Feb 22, 2020

Thanks

50a alternator pulley

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