Pump diagram for 855 cummins - TheDieselGarage.com
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post #1 of 11 (permalink) Old 04-09-2010, 09:19 PM Thread Starter
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Pump diagram for 855 cummins

Does anyone have a diagram for the PT pump? Or is there a place I can download a pump manual?

Thanks,
Tim
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post #2 of 11 (permalink) Old 04-10-2010, 03:35 PM
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Bump , if you have no luck on this forum try http://www.heavyequipmentforums.com/...splay.php?f=28
there is a guy on that one that has some old cummins books

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post #3 of 11 (permalink) Old 04-11-2010, 01:17 AM
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I have some Diagrams, but they are old. I was looking for them as well, and i found it in a library in my city and they didn't let me check out the book. I copied them, if you send me a fax number or i can scan them and then email it to you. I don't know if you'll need them because the pump is old and its a PT.
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post #4 of 11 (permalink) Old 04-11-2010, 02:37 PM
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What do you want to know, they are pretty simple, I just resealed one last week and was surprised at how little was in there.

'87 Autocar ATF 3406B 8LL 4:11's and tall rubber
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post #5 of 11 (permalink) Old 04-11-2010, 03:29 PM
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they are pretty simple....like ital said. what exactly are you looking for?

SHOP FOREMAN FOR PETERBILT IN THE GREAT STATE OF TENNESSEE.....28YRS JOURNEYMAN TECH
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post #6 of 11 (permalink) Old 04-11-2010, 05:12 PM Thread Starter
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This is on a 1979 290.

I really just like to know how things work. So it's not imperative that I find a diagram. I have an old diagram from probably the 60's.

When I'm accelerating through the gears at a certain rpm and load I guess the boost from the turbo signals the pump to pump more fuel. The increase in power is very noticeable. I'm just curious whats going on. It would be nice to have the boost a little sooner.
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post #7 of 11 (permalink) Old 04-11-2010, 10:04 PM
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Thats the AFC valve doing it's thing, holding back fuel until it sees boost to burn it cleanly. Pry the tin cover thats behind the throttle arm off, there is a screw that stares you in the face, back the lock nut off and screw it in some, try it. That'll give you better throttle responce.

'87 Autocar ATF 3406B 8LL 4:11's and tall rubber
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post #8 of 11 (permalink) Old 04-12-2010, 12:24 AM
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Ici l'image de la pompe de PT ressemble


here the image of the PT pump look like




Merci,Marc

Pas de problème,il marche n'est-ce pas?"(No problem, it works doesn't it?)
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post #9 of 11 (permalink) Old 04-12-2010, 01:43 AM Thread Starter
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Imagine my surprise to see the one and only French Electrician on the diesel forum. I don't post much (as SmithBuilt) but have seen your posts over on the MH forum.

Thanks for the diagram. It appears that pump does not have the AFC.



Thanks itali83 I will try that.

Tim
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post #10 of 11 (permalink) Old 04-12-2010, 01:57 AM
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Quote:
Originally Posted by T Red View Post
Imagine my surprise to see the one and only French Electrician on the diesel forum. I don't post much (as SmithBuilt) but have seen your posts over on the MH forum.

Thanks for the diagram. It appears that pump does not have the AFC.



Thanks itali83 I will try that.

Tim
Ouaip., vous l'avez obtenu corrects c'est le seul vrai Électricien français et je travaille vraiment sur un peu de plus grand moteur diesel plus commun trouvé sur des plus grandes unités de générateur.

Par la voie le diagramme j'ai posté ici il n'y avait pas AFC ainsi la valve AFC sera trouvée entre la valve coupée et le corps de pompe cependant il y a quelques modèles qui ont l'AFC sera sur la couverture ronde où Max et la vis de vitesse inoccupée seront placés aussi.

Yep., you got it correct it is the only true French Electrician and I do work on a bit of larger diesel engine more common found on larger generator units.

by the way the diagram I posted here it did not have AFC on it so the AFC valve will be found between the shut off valve and the pump body however there are some models that have the AFC will be on the round cover where the max and idle speed screw will be located as well.

Merci,Marc

Pas de problème,il marche n'est-ce pas?"(No problem, it works doesn't it?)
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