NAA starter issue

mountainsage · Jul 20, 2015

I hope I am in the correct forum. My 1954 Jubilee keeps eating starters drives. I am losing one about every three months or 50-75 start-ups. It is stripping the teeth out of the starter drive each time and I mean all the teeth. To this point there has been to visible damage to ring gear. Thoughts?

souNdguy · Jul 20, 2015

a couple things come to mind.

1, is this an oe style drive or a constant engagement drive with a sawtooth ratchet?

2, has it done this since you had the tractor.. IE.. new to you tractor... or is this one you have had for a while then started doing it?

3, double check ring gear, if there is a wear mark all the way around you may not be achieving good connection causing slippage.

4, is your NAA on 12v?

5, If the naa is 12v, did you have the starter converted to 12v?

6, not trying to put on a different model starter drive are you?

7, have you had the starter off and into a shop where it might have been swapped for another starter?
8, any shaft bend, play or damage?

mountainsage · Jul 21, 2015

1. Appears to be a sawtooth ratchet, 2.This is the third time in 1.5 years that the starter has broken, 3. I am sure that the ring gear will need replaced this year because I am sure it was not replaced by the prior owners, 4. It uses a 12v battery, 5. I order the starter that was stated to be the correct starter from yesterday's web site. I purchased it as it is now, 6. Uses the ones from yesterdays web site. The first one trashed the cast starter case top and the second time it just destroyed the splines on the "bendix", 6. I have purchased a rebuilt from Yesterdays site ( I believe it was a rebuilt not new) and purchase the prior starter from another reputable seller of Ford parts and the one before that was the one on it when I purchased the tractor. The first one appeared to be original. 8. All starters were supposed to be rebuilt/new when I put them on the tractor.

souNdguy · Jul 21, 2015

Sounds like a 6v starter on a 12v system, 2, if it broke he cast top.. i'd really be looking at that ring gear..

mountainsage · Jul 21, 2015

OK, what's the solution. Put a 6v battery in the tractor or is there a way to reduce the charge to the starter.

mountainsage · Jul 21, 2015

More information. The paperwork says that it is a 12v starter. Thoughts?

souNdguy · Jul 21, 2015

If true, 12v starter, new, and keeps eating drives, then I suspect ti g gear is worse than you think it is

mountainsage · Jul 21, 2015

I would have to agree with your assessment. I hope it can hold out for 15 acres more of hay then I will start the replacement process. Thank you for you time.

souNdguy · Jul 21, 2015

Darn phone tries to autocorrect too many words, but I think you figured out I was thinking ring gear. It may be chewed past the bevel, and not allowing full engagement, thus accelerated wear. Any deformed teeth could add compressional stress to the drive gear.

Good luck

mountainsage · Jul 23, 2015

peace and joy my friend

NAA starter issue

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