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John Deere Tractors Discussion Forum
:

4010 diesel not starting

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tomstractorsandtoys

07-03-2020 16:18:49




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A friend just got a 4010 that has not been used much for a few years. It started running rough and does not want to start. Drained fuel tank and changed fuel filters. Tractor will not start with the starter. No smoke when cranking and either does not help. Pull it 5 feet and it would start. Pulled the injectors and the injection pump. The pump had a bad head and rotor. Injectors not bad. Got the pump back today and still the same thing. Will not start with the starter and will not smoke any when cranking. Pull it 5 feet and runs great. Ran it for 15 minutes and went to restart and no go. Starter is spinning it over fast enough but still a no go. What are we missing? Tom

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fdt860

07-04-2020 17:36:25




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 Re: 4010 diesel not starting in reply to tomstractorsandtoys, 07-03-2020 16:18:49  
I know it is bad, but I have lowered injectors opening pressure on a 'would not start without towing' tractor. The pump was too worn to open them.

Injectors were set very slightly over new spec. Just setting back to the lowest setting of your injectors will work. Tractor still running fine 10 years after.



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Tim S

07-04-2020 13:51:48




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 Re: 4010 diesel not starting in reply to tomstractorsandtoys, 07-03-2020 16:18:49  
All very valid reasons for poor starting...



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Dieseltech

07-04-2020 03:54:55




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 Re: 4010 diesel not starting in reply to tomstractorsandtoys, 07-03-2020 16:18:49  
If cranking speed is too low, starting fuel delivery will be lower too. If cranking speed is OK, but needs pulled to start still sounds like a worn hydraulic head/rotor assembly. That's why I ask the question, how does engine start when HOT? That's where worn head/rotor really shows up..



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tomstractorsandtoys

07-05-2020 14:06:25




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 Re: 4010 diesel not starting in reply to Dieseltech, 07-04-2020 03:54:55  
We thought pump problem as well. Shop replaced the head and rotor and I think he said a new leaf spring as well and still no better. Pump shop is going to stop and look at it sometime this week. Tom



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fdt860

07-03-2020 23:18:22




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 Re: 4010 diesel not starting in reply to tomstractorsandtoys, 07-03-2020 16:18:49  
One thing that you can try is remove injectors and crank it with injectors pointing outside the engine.

Worn transfer pump, stuck pump pressure regulating valve plunger and sticky pistons in fuel pump will do same but would require high speed towing for restart.



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Cliff Nelson

07-03-2020 20:53:43




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 Re: 4010 diesel not starting in reply to tomstractorsandtoys, 07-03-2020 16:18:49  
Check the compression and cranking speed. Did this start all at once or gradually over time? I looked at a 1206 here last week that acts the same. Cranks over good but not much smoke. Won't start without ether if shut off for 15 minutes in 80 degree weather. It was here for something else so haven't addressed the starting issue yet.



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M-MAN

07-03-2020 18:07:33




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 Re: 4010 diesel not starting in reply to tomstractorsandtoys, 07-03-2020 16:18:49  
Sounds like some of the dairy tractors I used to work on. Wore slam out but the only things that mattered was a good clutch, no knocking and no overheating. Put new clutches in a bunch of them that had to be rolled off to crank.



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David G

07-03-2020 16:27:07




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 Re: 4010 diesel not starting in reply to tomstractorsandtoys, 07-03-2020 16:18:49  
Sounds like low compression or slow starter.



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