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856 pump vs 806 pump


 
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Kory1998
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Joined: 02 Aug 2018
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PostPosted: Tue Sep 10, 2019 6:20 pm    Post subject: 856 pump vs 806 pump Reply to specific post Reply with quote

Been researching this topic and gathering info seems that the pump I have on my 806 diesel is for an 856 diesel how ever these two tractor have different static timing , does that matter as to which pump goes on my tractor?
 
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pete 23
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PostPosted: Tue Sep 10, 2019 6:24 pm    Post subject: Re: 856 pump vs 806 pump Reply to specific post Reply with quote

Answered below.
 
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roaddevil49
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PostPosted: Wed Sep 11, 2019 1:27 am    Post subject: Re: 856 pump vs 806 pump Reply to specific post Reply with quote

See postings below to your second post.
 
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Al Baker(pumpman)
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PostPosted: Wed Sep 11, 2019 4:00 am    Post subject: Re: 856 pump vs 806 pump Reply to specific post Reply with quote

This really isnt rocket science. 1st the 856 pump replaced the 806. The 856 had a better advance. any engine that has seen ANY amount of hours will wear. Your timing gears have more lash today than they did when new. Its easy to loose 1-2 degrees of static advance just from wear you can not adjust. Almost ALL old tractors will benefit from a 1-2 degree advance on the static timing. Rotate your pump a 1/16 of an inch in the advanced direction and your problem should go away. Al
 
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jm.
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Location: Dover Tenn.

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PostPosted: Wed Sep 11, 2019 4:14 am    Post subject: Re: 856 pump vs 806 pump Reply to specific post Reply with quote

Kory , Like everyone has said you are beating a dead horse to death. Thirty + year old tractor may have other changes. The change in the pump could have been done years ago but when ever we had those tractors making that pump change was fairly common and if anything helped the performance of the tractor. You should be just fine with the pump as is and just replace those seal in the drive hub and go.
 
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Kory1998
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PostPosted: Wed Sep 11, 2019 4:24 am    Post subject: Re: 856 pump vs 806 pump Reply to specific post Reply with quote

Then what do I time engine too then for new pump
Not making any sense
 
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Dieseltech
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Joined: 29 Feb 2012
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Location: Indiana

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PostPosted: Wed Sep 11, 2019 5:55 am    Post subject: Re: 856 pump vs 806 pump Reply to specific post Reply with quote

Simple, if pump is for 806 use that manual spec, if 856 use that manual spec. That's why I asked you for the COMPLETE DBGFC 637 number, so I could look up what you have before I leave on vacation..
 
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Dieseltech
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PostPosted: Wed Sep 11, 2019 6:05 am    Post subject: Re: 856 pump vs 806 pump Reply to specific post Reply with quote

The 806 used 3DH and 8DH pumps, 7 degrees total advance, 65-70 CC max fuel setting at 2400 RPM. The 856 2KC has 10 degrees total advance, 65-69 CC max fuel setting at 2400 RPM. If the engine IS getting fuel into oil, and pump HAS been replaced recently, did the drive adapter get new seals too while pump was off? I INSIST on replacing those seals anytime 361/407 pumps are removed for repair.
 
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