Belt Driven Generator Replacement

To replace a large framed generator like was common on the older equipment, you can usually fit an alternator off a large truck to the same wide spaced mount. The larger alternators will probably take a larger variety of pulleys than the standard Delco, Ford, Chrysler, or Motorolla automotive designs. A heavy truck parts supplier or junk yard would be a good source if you don't already have one sitting out back.

If you want to go with a compact alternator, the Delco 10SI is about the standard for the type and are commonly available and usually pretty cheap. You will likely have to make a bracket or make modifications to the existing one to use one of these and find a pulley that fits the belt.

A picture of the current generator would be interesting if you can post one. I guess it was standard before the gear drive generators came in? Or maybe a later addition?

Thanks. I've got an early unit, so I suspect it's original -- pre-gear driven. I don't have any old trucks kicking around, so I'll have to do some external scrounging, or put together a bracket. I'll post a picture once I get back home -- I'm on the road this week.

Apparently I was confused. My is gear driven. Silly me.

Was kind of wondering about that.....never seen a factory belt driven generator on the D318 until you get to the "G" series industrial engine. Hesitated to say so...ya never know😉

just completed mine some pictures i machined a replacement shaft for the gen armature then fabed my adjust bracket to bolt on where brushes and other were mounted this closed off holes keep dirt dauber out there is room in back housing for 2 bearings the shaft long enough to protrude out end i put an larger pulley on shaft to overdrive the alt to put out 45 amp at idle this way if i ever want to i can change it back to gen very easily

Just find a good stock generator and convert it to 12 volts with external regulator, lights will be a little dim at an idle but it'll work.😊

jw45 - That's nice workmanship. Does the alternator and mountings stand up to the vibrations and shaking of the tractor, O.K.?

Versions of that have been around for a long time....seem to work ok.

yes it seems to hold up very well now as far as the generator is concerned it is a stock gm generator used on these machines the gens off the 50 model d cars and trucks will bolt up to the front housing but this alt conversion is a whole lot better