Finally....an answer to the 2520 starting issue

revitupfaster · Dec 10, 2010

JD755 said:
I can only go by what the John Deere Parts system shows. The drawings and parts lists show some 2520 have the air heater and some have the glow plugs. They also show all 2720 have glow plugs, and none of them have air heaters. I tend to trust the parts documentation over well meaning salesmen.

Do we not have any actual JD Techs that follow this forum that could get this straighted out for us.

At this point I give up. As long as the thing starts I'm good. How or why it starts......"Frankly Scarlet......I don't give a ......"

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diesel466 · Dec 10, 2010

Well I am going to try one last time, You are right jd755 the john deere parts clearly shows GLOW PLUGS on the new 2520 engines, I owned a 3005 with same engine and it had glow plugs, and yes I do know what a glow plug looks like, Jd part # mia 880840 is the cylinder head with glow plugs, you can use the where used feature to see it fits both 2520 and 3005. Glow plugs are a pre heat device as is a grid heater. Wow I cant believe this has been this hard.

kjung17 · Dec 10, 2010

I am new to this site, today. I am also,for better or worse, an actual JD tech. I mostly work on larger ag equipment, but have some knowledge of these little tractors. I can look up what we don't know. Is the engine Yanmar or Deere? Yanmar would be glow plug. Deer would likely be intake heater. Does the mystery indicator look like a little pig tail?

revitupfaster · Dec 10, 2010

kjung17 said:
I am new to this site, today. I am also,for better or worse, an actual JD tech. I mostly work on larger ag equipment, but have some knowledge of these little tractors. I can look up what we don't know. Is the engine Yanmar or Deere? Yanmar would be glow plug. Deer would likely be intake heater. Does the mystery indicator look like a little pig tail?

As far as I know, I think to date, all the JD SCUT & CUT Diesel tractors had Yanmar Engines. To answer your question, the "Mystery" light on my 2520, which is only about 2 months old, looks like a lightbulb, with a line inside the bulb that sort of forms 2 side by side loops. The light is on the upper right side of the dash directly under the lamp that comes on when the PTO is engaged.

It lights up as soon as you turn the key to the on position, and to me looks to be a orange colour when lit. Not a bright orange, but also not the same as the red lights on the left side of the dash

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kjung17 · Dec 10, 2010

That sounds right. Does the light not shut off? I did not read the original link.

revitupfaster · Dec 10, 2010

diesel466 said:
Well I am going to try one last time, You are right jd755 the john deere parts clearly shows GLOW PLUGS on the new 2520 engines, I owned a 3005 with same engine .

I have both the 2000 series brochure, and the 3000 series. Yes, the brochure lists both the 2520 and 3005 with the same Yanmar engine, right down to the same engine type number, 3TNV82A.

Why would the engine HP be more in the 3005 (27) than the 2520 (26.4). I know HST tractors have a lower PTO HP than would a gear drive, but I'm looking at the engine HP not PTO HP.

I know, a little off the thread subject.

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revitupfaster · Dec 10, 2010

kjung17 said:
That sounds right. Does the light not shut off? I did not read the original link.

Yes, the light will shut off in 10-15 secs. I really haven't timed it. My dealer said the duration the light stays on is related to a sensor, that measures the outside air temperature, and this determines how long the air pre-heater will stay on. Others seem to think the length of time is just a preset number of 10 secs or so.

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kjung17 · Dec 10, 2010

Again, this sounds normal. I would bet on the fixed timer, activated by ambient temp. Can I assume hard starting,still?

revitupfaster · Dec 10, 2010

kjung17 said:
Again, this sounds normal. Can I assume hard starting,still?

No....... I don't have a starting problem. The confusion is all about whether the 2520's have glow plugs or air pre-heaters, and what is the proper starting procedure. Some 2520 owners don't have the "Mystery" indicator light and my JD manual for the 2520 doesn't even mention anything about the light, its function or a starting procedure.

Your best bet would be to read all of this thread, and other threads which are referred to in this thread, and you will get a better idea of the confusion which surrounds the topic. It seems to me that JD has made a running change with the 2520, and basically we are trying to sort out what, if any, the changes were, and when they were introduced.

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