JD 450 crawler won't stay running

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450user
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JD 450 crawler won't stay running

Post by 450user » Wed Aug 21, 2019 4:16 am

I have an interesting problem on my recently purchased JD450 dozer: The machine starts right up, doesn't skip a beat for about 5-10 minutes. Then for no reason at all, it just stops running. Although I have it now that it will re-start after several cranks, but after a while, I quits. I replaced the lift pump since I noticed that the 8 screws on the top of the unit were loose, by as much as a 1/4 turn giving me the impression that the diaphragm might of been shot. Also replaced both fuel filters. That greatly helped keep it running longer, but like I mentioned above, 10-15 minutes later, it quits. Originally, when I purchase the machine, it barely had any fuel in it, so added about 15 gallons. I brought an air compressor to which I blew back the fuel line from the lift pump back to the tank and heard bubbling in the tank. But the issue persists!!! Any thoughts??
Last edited by 450user on Mon Aug 26, 2019 10:56 pm, edited 1 time in total.

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Re: JD 450 crawler on't stay running

Post by B Town » Wed Aug 21, 2019 5:47 am

Try running the machine with the fuel cap loosened or off(in clean conditions). I'm not sure what series 450 you have? Loosening the cap will isolate the fuel tank vent tube and it's function.

You need to search this forum for "mouse turds". Some internal components in the injection pump(IP) can breakdown and cause a restriction. There is a check valve near the IP that can cause problems as well.

Best regards, Bruce

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Re: JD 450 crawler on't stay running

Post by DrLoch » Wed Aug 21, 2019 6:51 am

As suggested search for mouse turds. Been there, done that. Here's a post listing some of the parts needed. As

viewtopic.php?f=8&t=12738
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Re: JD 450 crawler on't stay running

Post by 450user » Thu Aug 22, 2019 5:52 am

My machine is a straight 450, no letters. I'm going to try loosening the fill cap as to let air into the tank, se if that helps. I took it for granted that it did not need any venting. being a diesel!!

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Re: JD 450 crawler on't stay running

Post by DrLoch » Thu Aug 22, 2019 6:22 am

Let us know how that works out for you.
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Stan Disbrow
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Re: JD 450 crawler on't stay running

Post by Stan Disbrow » Thu Aug 22, 2019 1:13 pm

Hi,

There is a vent line. Runs from *under* the tank up thru the fuel, to the top just under the cap. Likes to get plugged by bugs. I have some pics I took, of the whole 'what was there in the beginning'. Stuff usually Gone Over Time. I never did put those on the new pic server, so they do no one any good atall. I already know what was there to begin with! :P

Stan
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Re: JD 450 crawler on't stay running

Post by Rayman1975 » Thu Aug 22, 2019 2:10 pm

I had the same problem after a total rebuild of my 450. Run great for 15 mins then die. Long story short it was debris in tank blocking fuel line. I would blow air from fuel line at the fuel pump and hear air bubble inside tank, so i figured it was somthing else. But realized that when crawler would die that once i loosened line at fuel pump there was a vacuum there and no fuel until after a bit it would start flowing again on its own. Once i drained tank and after flushing and using magnets to get all the chunks out of tank and have never had a problem since, rob

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Re: JD 450 crawler on't stay running

Post by 450user » Mon Aug 26, 2019 4:06 pm

Didn't find anything interesting in the tank. Drained over 20 gallons, unscrewed the return line and outlet, blew air into both. Nothing. Bottom of tank clean. Both lines are installed to the outside wall of the tank, not the bottom, as you would expect. I did find a 4" length of rubber fuel line joining the supply line of the injection pump, joined together though. I replaced the rubber line, but still, ran the machine for approx. 10 minutes, and it quite once more. Crap!!! I removed the small plate that is installed on the injection pump, to the right of the ID plate, to see if it had the "mouse turd" issue, but nothing there either. Approx. a cup of fuel drained out though. Not sure if there should be any fuel on this side of the pump.. Man, just don't know where to look next!!!

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Re: JD 450 crawler on't stay running

Post by Jim B » Mon Aug 26, 2019 4:31 pm

Which way did you blow through the return line? There is (supposed to be) a check valve at the return outlet of the pump. Sometimes the mouse turds or other debris might be stuck in it. It should be a fitting (item 9 in the attached parts book page link) located between the return line fitting and the pump. Similar location if you have a vertical mounted injection pump. Check those to be sure they are clear if you haven't.

https://partscatalog.deere.com/jdrc/sid ... gId/152446

It will be a bit messy but if you just loosen the screws on the timing window plate while it is running and let a little fuel leak out, will it stay running?

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Re: JD 450 crawler on't stay running

Post by B Town » Mon Aug 26, 2019 5:28 pm

Did you run the machine without the fuel cap? What was the result? Is the air cleaner/filters unobstructed?

Correct supply and return fuel lines come from the front of the tank. There should be a sump with a drain to get rid of moisture and debris. This is a great time to service the sump if it is not functional. Were you able to see the small screen inside the tank on the supply fuel line? Best regards, Bruce

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Re: JD 450 crawler won't stay running

Post by 450user » Mon Aug 26, 2019 11:05 pm

I did indeed run the machine with the fill cap loosened, and eventually, without it completely. No luck. Thanks for the link Jim B, but no luck going to the JD site. The site won't let you look at parts and diagrams, temporarily I suppose. No screens on the fuel supply end, of the tank either. just a line slightly bent towards the bottom, from the side wall (not the bottom) of the tank.

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Re: JD 450 crawler won't stay running

Post by Jim B » Tue Aug 27, 2019 4:08 am

The link just opened ok for me, so don't know what the issue is/was. Here is a cut of the drawing showing the check valve location for you.

Image

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Re: JD 450 crawler won't stay running

Post by gregjo1948 » Tue Aug 27, 2019 4:18 am

I had a JD 300B diesel tractor that would start and run a few minutes then quit. Turn out to be a faulty check valve on the return line going into the injection pump. It's just a little fitting just before the pump that has a little ball inside. Don't know if your 450 has it but, it's worth a look. About a $10.00 part. Don't know what just happened but A pic from Jim B popped up and the check valve I was referring to is shown as #9 part #R36535.
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Re: JD 450 crawler won't stay running

Post by DrLoch » Tue Aug 27, 2019 7:05 am

If the check valve solves the short term problem, it's not the long term solution.
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Re: JD 450 crawler won't stay running

Post by 450user » Wed Aug 28, 2019 6:42 pm

I ran a supply of fuel to the main line today, hooked up by an outside source other than the machine's fuel tank; same result :evil:

I will check on the check valve tomorrow morning. Hopefully, that will be the problem.

Thanks a lot guys. You are all a great help to my plight!!! I will keep you posted as to my progress or results!

J.

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