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49 A near catastrophy and question

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ML Haberichter

03-19-2001 18:47:10




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Had a near catastrophy with my A Saturday. While running, one of the connecting rod cap bolts came off. Got her shut down before serious damage was done. The damage was limited to a bent rod cap and bent bolt. Have contacted Shorty Dear regarding replacement parts, and advice but have another question. There was no locking device on the bolts. Shorty related his catalog showed no locking device on the bolts, (cotter pins, etc) just the castelated nut. Before I put it back together I am wanting to prevent this again. Is there something missing on my tractor such as a lock washer or a washer with a bendable tab to prevent these bolts from backing off and happening again? Or was this just an isolated incedent that happened? Any comments would be appreciated. Thanks.

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Mike Aylward

03-20-2001 05:17:28




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 Re: 49 A near catastrophy and question in reply to ML Haberichter, 03-19-2001 18:47:10  
ML, odds are you have what were called "Marsden nuts" on your rod bolts. These were a factory replacement nut that could be used with new bolts (as an assembly) or on your old bolts that have the cotter pin holes. The part number of these nuts is A4821R. The part number of the original nuts is D336R, with the cotter pin being 11H41 (1/8"x1"). Cotters were not used with these replacement nuts. They are loose on the bolt until torqued, then they squeeze themselves and lock to the bolt. It could be possible someone substituted one of these with a regular nut, which of course would cause what happened to yours. They normally don't give any trouble. Hope this helps. Mike

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Chuck

03-20-2001 03:29:35




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 Re: 49 A near catastrophy and question in reply to ML Haberichter, 03-19-2001 18:47:10  
Seems like they weren't properly torqued. I suppose you could get more bolts and nuts or you might lightly tap the nut castles inward before installing and you could even use some locktight. Maybe your cap and rods weren't meeting properly.



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Bill {Antique Acres}

03-19-2001 18:51:20




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 Re: 49 A near catastrophy and question in reply to ML Haberichter, 03-19-2001 18:47:10  
All the early styled Deere's I have worked have all had cotter pins on the back on the Castlenuts and bent over them to prevent them from coming loose. Bill {Antique Acres}



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ML Haberichter

03-19-2001 18:56:31




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 Re: Re: 49 A near catastrophy and question in reply to Bill {Antique Acres}, 03-19-2001 18:51:20  
I was surprised to find none on this one too. I'm in the process of rebuilding a "B" and it is drilled for cotter pins. However the bolts in this A were not drilled. I have no idea if this tractor has been rebuilt. Thats why I was wondering about other methods of preventing the bolts from backing off.



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rollo

03-20-2001 04:27:15




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 Re: Re: Re: 49 A near catastrophy and question in reply to ML Haberichter, 03-19-2001 18:56:31  
My '47 A has cotter pins with the castilated nuts. I'd bet that if your rod bolts are not drilled for the cotter pins they probably come off a later model tractor with a different type nut that can be peened or something.



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Frank-in-Tallahassee

03-20-2001 05:20:00




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 Re: Re: Re: Re: 49 A near catastrophy and question in reply to rollo, 03-20-2001 04:27:15  
Our '48 A broke a rod cap bolt back in 1970 while pulling the planter. You should have seen Dad jump off of the old tractor ! He thought she was going to blow up as she coasted to a stop.

We also had no damage to the cap or crank, so I went to town to buy a pair of rod bolts. At that time a "new" type bolt was sold by JD, non-drilled, with what appeared to be a castellated nut. The spaces cut in the nut were very close together, and the dealer (who I trust) said that these did not require cotter pins, but that they had a slight interference (pinch) built into them, so that they would stay tight after proper torquing. And they did.

However, to increase your comfort level, a bend over tab could be fabricated, and that should hold her.

Good Luck !

Frank-in-Tallahassee
70 D // 855

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