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John Deere Tractors Discussion Forum
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4020 veers off right on its own.......

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5020srock

01-19-2007 11:56:36




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hi, i have a 1968 4020 that likes to "steer itself" to the right,randomly,when traveling down the road. at first it was funny,
but it is unsafe if you are daydreaming. could
the steering system just need bled? i would like to hear from anyone who has experienced and remedied this problem. thanks




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adsma

01-20-2007 05:25:27




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 Re: 4020 veers off right on its own....... in reply to 5020srock, 01-19-2007 11:56:36  
Start with the steering valve. 9 times out of 10 the steering valve is getting worn from use and is leaking internally. Some places offer rebuilt steering valves when you send your core in for exchange. You can pull out the old valve/core and install a rebuilt valve in a afternoon. But make sure to get a service manual and properly bleed the air out after you install the rebuilt valve or after you have your valve rebuilt.

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msb

01-19-2007 12:06:10




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 Re: 4020 veers off right on its own....... in reply to 5020srock, 01-19-2007 11:56:36  
Bleeding won't help. It could be either the steering valve or it could be the steering motor up front. MY guess would be the steering motor since it only does it occasionally and if you say "drifts".If it seems to be turning under power then I would start by rebuilding the steering valve.



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5020s rock

01-19-2007 14:55:54




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 Re: 4020 veers off right on its own....... in reply to msb, 01-19-2007 12:06:10  
thanks for the reply, i should clarify,
out of the blue it jerks, it is not gradual.
glen in tx, do you want to weigh in ?



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G/MAN

01-19-2007 15:30:30




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 Re: 4020 veers off right on its own....... in reply to 5020s rock, 01-19-2007 14:55:54  
I'm guessing steering valves - by far the most common steering problem causer on New Gen tractors. I've done many steering valves and can't recall going into a steering motor - far more parts to fail and cause issues in the valve than in the motor. Unless you like tedious adjustments and want to beg, borrow, buy or rent special tools and a manual, pull the valve out yourself and take it to a Deere dealership or independent shop that's familiar with them and have them rebuild it. Also make sure they have the means to test the valve for proper operation before you reinstall it.

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Nathan (SD)

01-19-2007 19:56:32




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 Re: 4020 veers off right on its own....... in reply to G/MAN, 01-19-2007 15:30:30  
Our local dealer went to doing both at the same time. Claims it is cheaper in the long run. If one is bad the other can't be far behind. Hasn't come across too many dissenters.



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msb

01-19-2007 15:59:40




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 Re: 4020 veers off right on its own....... in reply to G/MAN, 01-19-2007 15:30:30  
Steering motor failures are much more common on tractors equipped with loaders.How have you been so lucky to not have to rebuild a steering motor?lol,bob



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G/MAN

01-22-2007 07:43:16




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 Re: 4020 veers off right on its own....... in reply to msb, 01-19-2007 15:59:40  
I've rebuilt one or two over the years. But have them fail as often as the valve? Never. We have more of them break the casting (on newer tractors like 4440s) if they hit a pivot track hard or something like that than motors that quit due to leaking seals or whatever. No, we honestly don't rebuild the motor just to do it, particularly if the tractor has a loader on it, loader frames to fight, etc. Maybe someday we'll run into a rash of trashed motors, but it hasn't happened in the 6+ years I've been here.

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donmyeil

01-20-2007 09:54:53




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 Re: 4020 veers off right on its own....... in reply to msb, 01-19-2007 15:59:40  
The steering motor seals are shot. They leak trapped oil and when the steering wheel is turned to the right it stops and opens a valve that refills the steering motor. Then the wheels turn to the right. you can prove this by removing the little hose on top of the oil cooler ,cap off the oil cooler and run the tractor and steer the tractor back and forth rapidly. should be very little oil (drops)come out of the hose.If there is a flow the seals are worn out

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