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John Deere Tractors Discussion Forum
Show Parts for Model:

4020 engine surge

Author  [Modern View]
Toby B

01-19-2013 21:02:17

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Hello, I"m looking at a 4020 to buy and in speaking to the former owner he told me after it was warmed up and under load it would surge a little. The dealer changed the injector pump but no luck. Any ideas? I hate to buy into a big problem.
Thank you

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Toby B

01-20-2013 06:56:01

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 Re: 4020 engine surge in reply to Toby B, 01-19-2013 21:02:17  
Ok, thank you for your help.

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Jethro Lilley

01-20-2013 05:43:45

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 Re: 4020 engine surge in reply to Toby B, 01-19-2013 21:02:17  
try something simple first... change the fuel filters.

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David G

01-20-2013 05:10:05

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 Re: 4020 engine surge in reply to Toby B, 01-19-2013 21:02:17  
It could be the injector pump, or an air leak in the diesel lines going to the pump.

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Too Far Gone

01-19-2013 21:35:52

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 Re: 4020 engine surge in reply to Toby B, 01-19-2013 21:02:17  
We had one years ago that got to doing weird stuff like that and its cam gear was so worn you could move the flywheel like 18 degrees before the timing marks in the injection pump would move.I think its supposed to be like no more than 3 degrees.This tractor also heated after an hour of pulling.New cam gear fixed it all.

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01-20-2013 10:13:34

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 Re: 4020 engine surge in reply to Too Far Gone, 01-19-2013 21:35:52  
Was there noise coming from the front of the engine? I think this might be an issue with my 4320.

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Too Far Gone

01-20-2013 11:52:01

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 Re: 4020 engine surge in reply to 430, 01-20-2013 10:13:34  
No noise at all,pulled OK,just surged and heated

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