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Restoration & Repair Tips Board

JD 2040 maybe Compression issue?

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BUSHHOG

09-14-2012 12:11:40
64.202.237.105



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I have a JD 2040 that has a new electrical harness and battery. It usually starts right up but it started taking longer to start each time. It has gotten to the point that it runs the battery down before it starts (I think I have ruined the battery). I have checked the fuel lines by the cylinders and it is squirting out fuel so it looks like that is not the problem. My brother thinks it is not turning over fast enough to start it and in away I think that to but kinda different. Here is what I mean. I do not think it is the starter (seems to be turning over just as fast as when it started fine) I think it has to do with some compression issue, 'cause when we pull start it and it turns over really fast it starts, maybe that is because it doesn't have time not to compress. Maybe? and when it turns over with the starter (that is obviously slower) it wont start 'cause is has time not to compress. I don't know if this makes sense or not but it seems logical. Does anybody know how to check compression? I would greatly appreciate any help in this matter. Thanks!

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LJD

09-17-2012 14:51:53
75.194.58.188



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 Re: JD 2040 maybe Compression issue? in reply to BUSHHOG, 09-14-2012 12:11:40  
Deere tractors are known for starting problems like you describe. It's usually caused by the closed-center hydraulic system that results in slow cranking. Put on a $10 pump destroker and it will crank-start as fast as it does when you pull-start it.



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Andy C

09-15-2012 05:45:17
72.94.18.55



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 Re: JD 2040 maybe Compression issue? in reply to BUSHHOG, 09-14-2012 12:11:40  
Bushog,
To answer your question, they do make compression gauges to check diesels. In addition to the gauge you would need an adapter that fits in the Injector hole after removing the injector. Normal compression gauges will not likely go to high enough pressure as the diesel has much higher compression. Just checking fuel at the injector lines does not assure the injectors are operating properly. A diesel pump repair shop would check your injectors for a very reasonable fee. Does the tractor smoke at start up? Does the smoke clear up after the engine is warm. Does the tractor start easier/more difficult after it is warmed up. As you may see here there are lots of variables to consider. some more information (and followups for those reading the posts) would be very helpful in diagnosing your starting issue.
Good luck,
Andy

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