Re: Does anyone know how to trun up a injector pum

Posted by jdemaris on November 06, 2004 at 20:29:54 from (209.23.30.2):

In Reply to: Does anyone know how to trun up a injector pump. posted by krk on November 06, 2004 at 11:02:42:

Turning the pump up or down is a simple job as long as you know what your are doing. I'm a little rusty since I haven't worked for a Deere dealer since 1990 (started in the 60s). We were selling the 55 series new around that time, and some of the models were VERY responsive to turing up the fuel - especially the 2755 as I recall. We put every tractor we sold, new or used on the dyno, and usually turned up the fuel until we saw excessive smoke under load or overheating problems. I know of many tractors that absolutely did not loose any of their longevity or reliability from this - but we were conservative about it. AS far as sending a pump to a pump shop every time you want it changed or checked over - I think it's nuts unless you have a bottomless wallet. If you don't have the knowledge, and you're stuck with a bad pump, that's a different story. From what I've seen on the repair bills for pumps coming back from pump shops, it appears to me that they are charging well over $100 per hour.
There is nothing magic inside a CAV or RoosaMaster pump. You can also calibrate it, and set the timing advance on the running tractor - it does not require a pump test stand.
That being said, I don't remember if the 2755 has a Standyne/RoosaMaster distributor pump, or a CAV distributor pump. The Roosamaster gets turned up by one scew - accessed from outside the pump. You should do it 1/8 of a turn a time - clockwise to increase. The pump will have limiting shims installed (if they haven't been removed) which will prevent you from turing it very far. If you have a CAV, you remove the trap door on the side of the pump, loosen a bolt that hold two pieces of metal togehter - you loosen it and move one piece against the other a bit. Sorry, but I don't know how to explain it better with just words. I suspect you won't get much more than an extra 5 horse from the 2555 before you get to a point where fuel is being wasted.

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