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Farmall & IHC Tractors Discussion Forum
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MD injector pump

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Doug N

09-03-2007 11:29:50




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Hi guys. I'm unable to get the pressure at the inj pump above 40 psi on the MD. I even stretched the spring a little, it just goes back to normal. I even tried putting a washer or two in it, nothing. It sometimes goes up to about 50, but goes back down then. It doesn't smoke one bit.

Is the lift pump the problem? If so, how do I fix it?

I was told it should normaly have about 60 pounds. Is this right?

I know that inj pump timing would make it not smoke, but I don't have much pressure. Once I get the pressure it needs, then I'll mess with the timing. Thanks, Doug N

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sflem849

09-04-2007 07:30:25




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 Re: MD injector pump in reply to Doug N, 09-03-2007 11:29:50  
You don't turn the pump up unless you really don't like the pump. This is what I have heard from both tractor pullers and farmers who had them. Most say it won't make it 300' if you turn it up.
As for power. A MD doesn't have all sorts of power. At least they don't have much at the tractor pulls around here. However, they will run super cheap and lug well.



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Doc Larry

09-04-2007 05:33:53




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 Re: MD injector pump in reply to Doug N, 09-03-2007 11:29:50  
Doug,

The transfer or lift pump supplies fuel at low presssure to a master plunger that delivers fuel at much higher pressure to the injectors. What you're describing sounds much more like a problem on the high pressure side, or possibly a timing issue as you mentioned. You definitely should get some smoke under load. I think the timing procedure is given in the owner's manual if you have one. If not, a fairly detailed explanation is on either this site or the Red Power site if you do a search of the archives. Sorry I can't remember which.
Assuming you've done all the filters and checked out the scavenging valve, you may end up having to get the pump checked out. I got lucky and found a good used one, cheap, after buying two that were worn out.
Larry

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Doc Larry

09-03-2007 17:20:57




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 Re: MD injector pump in reply to Doug N, 09-03-2007 11:29:50  
I no longer have my reference books but your pump pressure doesn't sound that far off. The pressure you're describing is the transfer pump, or lift pump, pressure. Your post is a little confusing to me, but with no smoke at all, you might have any number of problems - common ones for this pump (an A model?) are scavenger valve malfunction, stuck primary plunger, and stuck rack. If you go to the Red Power site you may find more experts on these early pumps.

Although after re-reading your post, I am unsure if the engine is running and not smoking, or not running at all??

Larry

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Doug N

09-04-2007 00:50:13




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 Re: MD injector pump in reply to Doc Larry, 09-03-2007 17:20:57  
Doc, yeah I guess I should have said a little more. Tractor runs. I've been plowing and discing the past 3 days with it. It runs good, but just doen't seem to have the power it should. When working it, there is just barely a hint of smoke. I called the local dealer here and am going to try to take it down sometime this week to check it on the dyno. Doug N



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n9lhm

09-03-2007 17:18:11




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 Re: MD injector pump in reply to Doug N, 09-03-2007 11:29:50  
Book spec is 32-39 pounds out of the primary pump. It sounds like you are trying to fix a non-existent problem. :) There are relief valves both in the primary pump and in the plunger assembly to keep it from going much higher than that.



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Doug N

09-04-2007 00:53:53




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 Re: MD injector pump in reply to n9lhm, 09-03-2007 17:18:11  
OK, Thanks for the help. If there are releif valves to prevent pressure from going above 40, then how do you turn the pump up? Thanks, Doug N



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n9lhm

09-04-2007 06:22:59




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 Re: MD injector pump in reply to Doug N, 09-04-2007 00:53:53  
There are several different adjustments that determine total fuel delivery. There are two separate governors in that pump, a conventional one that controls the fuel delivery vs. speed like an ordinary governor, and a torque control that assumes control when the engine is pulled down in speed during an overload. You really need to get and read the manual for that pump to understand the different adjustments and how they work and interact.

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