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3588 can't set low idle and still shut down tractor

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Anonymous-0

Well-known Member
I'm trying to set the low idle on my 3588 so that when the throttle is pulled to the low detent on the console it idles at around 900. The problem is that when I set this, the tractor will not shut down when the throttle lever is pulled to the shut down position.

I've tried adjusting the cable, and I've tried screwing in the "capsule" on lower back of the pump (the one with the jam nut). Screwing the capsule in raised the idle but it would still not shut down. This was the only suggestion I got when I posted last week.

Is it just not possible to do what I'm trying? I
 
With the cable disconnected at the pump, can you still get high idle and shut off? If not, the problem is with the pump. If it works ok at the pump the problem is with the cable and linkage.

Make sure that when you move the throttle linkage that you have enough travel to go past the throttle stops on the pump. With the pump lever pulled back it needs to move past the point where it just contacts the stop but also causes the lever to pull against the spring assembly. The same with shutting it off. The lever needs to move past the pint where the shaft stops turning into the pump and goes forward against the spring.
 
Looked back at your original post, if you can't adjust it like I said, I would bet a pump repair shop could do so without taking pump off, however, it may well be difficult to get someone to come and do it at a reasonable price unless you are close enough to their shop to just drive it up and have them look at it. The idle adj capsule has a spring inside and you are setting idle speed on this spring and then when you go to shut off you have to compress that spring, well, some of them springs were too darn stiff from day one , I used to take the spring out and replace it with a lighter one but that is not a job to be taken lightly. You may well have to take pump off like others have suggested.
 
I was able to adjust it like you said; First I disconnected the throttle cable from the arm on the pump. Then, I loosened the jam nut that was difficult to get to, and could turn the capsule in (raise idle) or out (lower idle). Once I had the idle where I wanted it I set the throttle lever to the low idle shelf on the console, and adjusted the length to connect to the pump arm.

But, also like you said could happen the motor would not shut down when I moved the lever to
the shut off position - it just slowed down to under 400 rpm and sputtered along.

Based on this - would changing the spring be the only way to fix this, or does the pump need to have something rebuilt? THe biggest reason I'm concerned about it is because when other people operate the tractor they forget that they can't just pull the lever down to the idle shelf - the highest I can idle it while still being able to shut it down is around 650, which is to low especially for a 2+2.

I really appreciate your help.
 
Yes - when the cable disconnected I can set the idle where I want using the capsule on the lower rear of the pump and shut it down manually by moving the pump lever forward to the shut down position. It doesn't feel loose in the arm or mechanism at all.

I think I may built a small bracket in the console to move the throttle lever stop position up about 1/2". My problem is that that there isn't enough travel when I move the lever from the idle 'shelf' on the console to the shut down position to move the pump control arm into the shutdown area.
 
I understand your concern about other using your tractor as the 2 plus 2 models need a high idle speed so as not to damage the flexible rubber coupler at the flywheel. I have an old pump in the basement and will take a look at it to refresh my memory on the spring issue.
 
Yes - that is exactly it. My coupler already has a tear in it, and at a cost of $900 from the dealer I need to make it last. Thank you!
 
If your injection pump lever has two holes in it, using the lower hole to attach the cable rather than the one on the end will give you more travel on the pump arm.
 
Right on about the two holes in the lever, never seem to remember all the different angles that can give correct results. As far as the spring in the capsule, I just pulled the one out of my old pump, just took screw plug out of end. Spring on this one is l 3/4 inches long, 3/8 inch diameter, and 14 coils. If your other adjustments don't cure problem, I would just find a different spring and give it a try. I have done this,(like maybe 20 years ago).
 
Thanks - I actually drilled a 3rd hole under the lower of the 2 to give even more travel. It helped, but just dropped the idle a little lower when I went to shut down. That is what made me think that there was another adjustment to be made.
 
Thank you for going to that trouble. Is the spring hard to take out? I would like to try changing to a softer one, and maybe seeing the mechanism would help me understand what is happening in the pump when I move the lever to shut down.

Do you know if the throttle level sets the fuel delivery from 0% to 100% as it moves through its range? Or, does it move from shutdown (0%) to an idle rate in one step, like as if there was a shut off valve in addition to the rate adjustment. I hope I'm explaining this right: on my Massey tractors, the throttle lever is separate from the shut down control. You set the idle with a screw, pulling the throttle all the way down can only bring the idle to the point the screw is set to. To shut off, you pull a different knob and it moves a different lever on the pump. Is this function combined on the pump on the IH motor? And, is that the adjustment I need to make - moving the shutdown action closer to the throttle action?
 
Spring is very easy to take out, merely hold capsule so it cannot turn (maybe using a vise grip very carefully if necessary) and use a large screwdriver to take plug out of end. So far as the operation of innards, well, you are in essence only moving the control sleeve on the plunger through governor linkage inside, at shut off you are moving sleeve far enough so port is exposed to the point where plunger can no longer build enough pressure to open the injection nozzles so there fore it quits running.
 
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