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50 JD B Seized While Running

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bmoran4
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PostPosted: Mon Jan 21, 2019 7:45 pm    Post subject: 50 JD B Seized While Running Reply to specific post Reply with quote

Had to unfortunately start and maneuver my 1950 John Deere B in the cold snow this evening (9?F with -3? Windchill). She was hard
starting - needed to be jumped. Finally she got running and after about 15 minutes of idling, she stalled and appeared seized.
Too cold to troubleshoot or do anything so now I'm stewing over the keyboard and wondering how expensive this is going to be...
Appreciate any thoughts on how to methodically approach this.
 
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David G
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PostPosted: Mon Jan 21, 2019 7:52 pm    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

Did it have oil pressure?
 
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bmoran4
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PostPosted: Mon Jan 21, 2019 7:53 pm    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

Couldn't tell ya in all honesty...
 
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Bob
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PostPosted: Mon Jan 21, 2019 8:00 pm    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

MOST likely cause would be that ice in the oilpump caused the oilpump drive coupling to break.
 
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bmoran4
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PostPosted: Mon Jan 21, 2019 8:02 pm    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

CVPost-Bob wrote:
(quoted from post at 00:00:45 01/22/19) MOST likely cause would be that ice in the oilpump caused the oilpump drive coupling to break.


How would I be able to diagnose the oil pump drive coupling? If I do find it broken, I presume the repair is likely more than just replacing the coupling?
 
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David G
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PostPosted: Mon Jan 21, 2019 8:17 pm    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

I do not know on the coupling, but if the engine did seize do to lack of lubrication, it will probably take more than the coupling to get it running again.
 
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JD Seller
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PostPosted: Mon Jan 21, 2019 8:24 pm    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

I will second that you broke the oil pump coupling. Common failure on them in cold weather. You can take the cover off the crankcase and reach in and check the coupler. As for damage. Most of the time you will not ruin the crankshaft or rods at idle. Rock it back and forth with the cover off and see what seized. If your lucky and it is just a rod bearing you can often polish the crankshaft in place. Then install new rod bearings and drive on. Replacing the coupling first. LOL If it is the main bearings than your in for more work.

This happening is one design failure of these tractors. The oil pump is the lowest point in the lubrication system. So any water goes right into the pump gears. Then it freezes and locks the pump. This shears the coupler. If your not watching the oil pressure or the gauge is broken then you have it seize.
 
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David G
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PostPosted: Mon Jan 21, 2019 8:29 pm    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

Are those babbit rods?
 
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JD Seller
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PostPosted: Mon Jan 21, 2019 8:59 pm    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

David If it is a 1950 model it should have inserts.
 
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620 John
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PostPosted: Tue Jan 22, 2019 6:07 am    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

JD Seller wrote:
(quoted from post at 21:59:31 01/21/19) David If it is a 1950 model it should have inserts.

 
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620 John
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PostPosted: Tue Jan 22, 2019 6:10 am    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

I think 1950 could have had either babbit or inserts. To the op would pull the crankcase cover off and see if the coupler is broken
 
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Mark-Ia
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PostPosted: Tue Jan 22, 2019 6:52 am    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

After the crankcase cover is off, follow the shaft up, the pump coupler will be at the top of the shaft.
 
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bmoran4
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PostPosted: Tue Jan 22, 2019 7:29 am    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

Thanks guys - I'm relatively new to servicing this John Deere B. I tried to find the dip stick to see if I could get an oil level and look for glitter, but couldn't locate it.

As for removing opening the crank case and inspecting the bearings and coupler, any one have pictures or a diagram?
 
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Bob
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PostPosted: Tue Jan 22, 2019 7:43 am    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

bmoran4 wrote:
(quoted from post at 10:29:37 01/22/19) Thanks guys - I'm relatively new to servicing this John Deere B. I tried to find the dip stick to see if I could get an oil level and look for glitter, but couldn't locate it.

As for removing opening the crank case and inspecting the bearings and coupler, any one have pictures or a diagram?


The oil is checked with an oil level test plug low down on the RH side of the tractor just behind the cylinder block.

You can download the parts catalog, complete with parts drawings (.pdf) at the link below, you'll need to purchase a shop manual if you'll be tearing into it.

Here's a drawing of the oil pump, coupler is Key # 18.

For reference, looking up at the underneath of the tractor, you can see the bottom of the oil pump cover, Key # 32, near the oil filter bottom cover, Key # 15.



http://jdpc.deere.com/jdpc/JDPC/attachments.jsp?associatedPc=PC0330.pdf
 
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Mike M
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PostPosted: Tue Jan 22, 2019 8:02 am    Post subject: Re: 50 JD B Seized While Running Reply to specific post Reply with quote

In that case who knows if it even had oil in it ?
 
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