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Tractor Talk Discussion Forum

This may be the first time this has been asked on

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PJBROWN

11-04-2006 18:02:49




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Could someone please tell me how to turn down a ROTO-DIESEL FUEL INJECTION PUMP !!! I bought a JD 2840 and I was told when I got it that the pump was turned up. I didn't think much of it ,but it uses a boat load of fuel... plus I want it to last a while.




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buickanddeere

11-04-2006 19:35:11




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 Re: This may be the first time this has been asked in reply to PJBROWN, 11-04-2006 18:02:49  
Fuel efficiency can be a subjective issue. Trade to a new tractor with twice the HP and do twice the work per hour. Yet if the fuel tank is 1.5 times larger than the old tractor. And you have to fill the tank every four hours instead of six.You will feel the tractor is a hog. If the tank was 3 time larger you would think she goes a long way on a tank of fuel. Putting that 2840 on a dyno and measuring fuel use is the only way to really know. The seat of the pants makes inaccurate dyno. The problem could be as simple as worn/dirty injectors or mud dabbers plugging the air intake. How many times has the primary and secondary air filters been cleaned? Is there something like a hydraulic leak making the pump operate constantly and take extra HP to drive? Is the tractor overballasted and burning a whack of fuel just to over come rolling friction as it hauls it's fat *ss around?

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jdemaris

11-05-2006 06:04:29




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 Give a farmer some credit for common-sense. in reply to buickanddeere, 11-04-2006 19:35:11  
In reference to your comment: "Putting that 2840 on a dyno and measuring fuel use is the only way to really know. The seat of the pants makes inaccurate dyno." It does NOT necessarily work that way. I think a farmer that knows his tractor can certainly tell when it's using more fuel than ususal - or more than it ought to for certain tasks - as compared to other tractors. I don't recall ever seeing a 2840 myself - why I don't know. But, we sold a pile of 10, 20, 25,26,27, and 29 series tractors - 40s, 50s, and 55s. I left the Deere dealership when we were selling the 55s new.
Many were using the CAV rotary pumps instead of Stanadyne's they copied - and many that we sold new got turned up at the buyer's request. Yes, we had a dyno - it was NOT a requirement, it just saved some guess work and jerking around. We'd often run them at full load for an hour to make sure there were no cooling-system issues. And - about buying a bigger tractor and doing twice the work. Well yeah . . . - but usually, that bigger tractor will be a dog when it's used for low-horsepower work - including the newest ones. About when Deere introduced the 40 series tractors - it was discovered that some models responded extremely well to fuel turn-ups as compared to older tractors. And, that became more true with the 50 series. In some models, Deere would use the same engine in several tractors of different horsepower ratings -and the fuel-delivery was the only major difference (and better cooling systems at times). I'm sure we turned up hundreds of tractors - and I'm know other dealerships did also. Subsequently, I assume some are still out there - especially with CAV pumps - since they are built better than the Stanadynes and may have never been off for a repair-job.

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Mike M

11-04-2006 12:21:56




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 Re: Give a farmer some credit for common-sense. in reply to jdemaris, 11-05-2006 06:04:29  
I was recently amazed by a neighbor that said his JD A model only seemed to be makeing XX HP He wanted to bring it over and dyno it and fine tune some adjustments. His "seat of the pants " figure was right on ! his tractor was low and it turned out to be just a matter of RPM. The fast idle was set at load speed a small adjustment of RPM made a big difference in HP on these slow rpm tractors.



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jdemaris

11-04-2006 18:57:38




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 Re: This may be the first time this has been asked in reply to PJBROWN, 11-04-2006 18:02:49  
My brain is a little foggy at the moment, but are you talking about a CAV roto-diesel? If so, they are easy to turn down or up - much easier than a Stanadne/Roosamaster. They are based on the Stanadyne pump however - but somewhat different. CAV bought the rotary-pump rights from the company Vernon Roosa created (Stanadyne). Anyway, I wish I had a photo I could mark for you - it would be easier. I haven't turned one up, or down in years -but it was a common thing when I worked for Deere. Especially for farmers who wanted to take their tractors to the county fair for pulls. We'd turn them up, and then turn them down, every year. You take the timing window off the pump. There are two plates - side by side and they are held together by - as I remember - small bolts - maybe something a 10MM wrench or a 5/16" will fit? You loosen them just enough so you can make the plates move in respect to each other - the mounts the bolts fit through are slotted. Moving one way turns fuel up - and the other way down. It sounds complicated, but it's not - once you see it. Just make small moves at a time, retighten, and then try it. A small amount of movement makes a big difference. If you turn it too high it will blow a lot of black smoke, and if too low - it will start hard and lack power. Maybe someone out there can describe it better detail. But - to go through the time and expense of removing that pump - and sending to a pump shop - for a ten minute adjustment sounds a little silly to me - unless you are not mechanically inclined and have lots of money to through away.

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low budget

11-05-2006 04:04:34




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 Re: This may be the first time this has been asked in reply to jdemaris, 11-04-2006 18:57:38  
Yep. Three bolts, you need to turn the engine over to get all three. Just loosen them a little. At one place there will be a timing mark on one plate to use as a reference against the other plate. Remember to retighten all the three bolts after each adjustment , (before each trial run).Dont horse on them they're small. But remember a diesel wont burn more fuel than it needs to do the job, unless your puffing lots of black smoke every time the engine accelerates you wont see much difference. Check or replace your filters first (air and fuel) like the others said. Does that sound about right to you?

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old

11-04-2006 18:21:40




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 Re: This may be the first time this has been asked in reply to PJBROWN, 11-04-2006 18:02:49  
Nope BTDT and asked about that a couple years ago but found on what I had you had to take it in to the shop to turn it down much. In my case it was an Oliver 88 diesel that had a pump off an Oliver 1750 which was way to much for the 88. I ended up tradeing it off becuase I was affriad to use it much the way it was

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BigMarv1085

11-04-2006 18:25:34




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 Re: This may be the first time this has been asked in reply to old, 11-04-2006 18:21:40  
Take it to a injection pump shop and have them reset it.



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