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Oliver 1855 Chain Coulper Falling Off !!!!!

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COWBOY

04-09-2002 06:29:22




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Have a 1974 year Oliver 1855,... With Over/Under.

The problem is the chain coupler between the Over/Under drive and Transmission keeps on shearing off the Cotter Pins and the chain keeps falling off.

I looked at it, and made sure the 2 shafts are aligned, (Both up and down and side to side) and shimed the engine mounts and adjusted the bolt under the Over/Under drive to support it.

But this is the 2nd time in 30 hours since rebuild of the engine that it has happened. Last owner had same problem. I caught it this time as it started "Jingling" when the clutch was released.

I checked the slide gear on the transmission side for excessive wear, and it seems OK,.. A little loose, but I don't think it is enough to do this?

The shaft from the Over/Under is tight, and no forward/rearward movement.

What am I missing here ????? ??

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Mike Ky

04-13-2002 08:45:54




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 Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to COWBOY, 04-09-2002 06:29:22  
If you have a over-under 3 speed, check the bolts that hold the rear clutch housing on. They have copper washers under them. If the 3 speed has had work done on it, some times they may have 2 washer on these bolts. This will let the coupler pins hot the head of the blot and break the chain.



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Dave

04-09-2002 15:52:59




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 Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to COWBOY, 04-09-2002 06:29:22  
Happened to me a few times. Enough so I made this something to check or replace every spring. Of course since then they haven't broken. Four cotter pins don't work period. When you put in the one long one and two short ones you really need to be sure the ends are bent back enough to stop rotation and using the stainless pins helps. DAVE



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COWBOY

04-09-2002 16:05:49




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 Re: Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to Dave, 04-09-2002 15:52:59  
Seems like 1 piece cotter pins and being Stainless is the way to go !!!

Thanks everyone!



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Wrenchbender

04-09-2002 11:18:02




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 Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to COWBOY, 04-09-2002 06:29:22  

Cowboy you say you are shearing the cotter pins off. Are you putting in one long one that will go through both pins in the master link? If not the short cotter pins will rotate around and eventually cut them selves off. You only need one long one, I usally put it on the front side. The original pins were hardened, but regular ones will work also. WB.



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COWBOY

04-09-2002 15:07:01




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 Re: Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to Wrenchbender, 04-09-2002 11:18:02  
The parts book for the 1855 shows 4 cotter pins,...

But my 1955 Parts Book shows either 4 short or 2 long Stainless steel cotter pins,..

I will have to try to find a few,.. 3/32 x 1 3/4 Stainless steel ones.



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Larry from Maryland

04-09-2002 09:26:45




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 Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to COWBOY, 04-09-2002 06:29:22  
One thing other thing to check is the bolts holding the front frame to the rear. I have found them so loose you could stick the shaft of a screwdriver in between.The cotter pins are special hard ones they often get replaced with standard ones that fail.



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COWBOY

04-09-2002 15:08:09




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 Re: Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to Larry from Maryland, 04-09-2002 09:26:45  
Nope,... Everything is tight !!! Thanks,..



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jethro

04-09-2002 08:20:53




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 Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to COWBOY, 04-09-2002 06:29:22  
use some stainless pins, that always works for me



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COWBOY

04-09-2002 15:09:33




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 Re: Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to jethro, 04-09-2002 08:20:53  
I found in my 1955 Parts Book that they call for Stainless Steel ones!!!

I am learning a lot on this problem,.. Thanks.



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Shadetree

04-09-2002 07:11:02




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 Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to COWBOY, 04-09-2002 06:29:22  
Cowboy how is the wear on the two drive gears where the chain rides between the teeth? Also the alignment between the two drive gears is best checked by holding them tightly together first and then checking the alignment using your finger to feel and make sure they feel completely level. With the wear of the splines of the input shaft it will let the transmission gear fall slightly and seperate at the bottom between gears which can give you a false sense of alignment. You should also make sure that the engine alignment bolts are in the right places as well. There are two 9/16 bolts one belongs in the left front corner of the engine and the other belongs in the left rear corner. You can check this by using a 13/16 socket to confirm that they are in the right place. The other two bolts are smaller and use a 3/4 socket to tighten them, and make sure that all four bolts are tight as well. You might even check the bell housing mounting plate to make sure it is tight as well I have found a couple of these loose too. As a last resort I have heard of some of the replacement clutches can be out of balance causing excessive vibration, but this can be difficult to track down too. I hope you can find something else before you get to this point. Good Luck Shadetree.

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correction

04-09-2002 20:41:11




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 Re: Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to Shadetree, 04-09-2002 07:11:02  
shadtree you mean the right rear location



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Shadetree

04-10-2002 03:42:37




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 Re: Re: Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to correction, 04-09-2002 20:41:11  
Yes you are right thankyou for the correction



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COWBOY

04-09-2002 15:04:06




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 Re: Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to Shadetree, 04-09-2002 07:11:02  
I see what you mean.... I broke out the Parts Books for both the 1855 and 1955,...

Who would of thought diffrent bolts ???? I will have to check it tomorrow, but I believe they are all 1/2 inch,...

Thanks,..



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Rich

04-09-2002 09:05:32




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 Re: Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to Shadetree, 04-09-2002 07:11:02  
Shadetree
I am curious about the different size holddown bolts, was this also used on 77s?



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yes

04-09-2002 20:44:45




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 Re: Re: Re: Oliver 1855 Chain Coulper Falling Off !!!!! in reply to Rich, 04-09-2002 09:05:32  
they were used in the front left hole and the right rear hole



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