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John Deere Tractors Discussion Forum
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4020 hydraulics

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bah

08-03-2005 06:40:04




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I have a 1971 4020D that all of a sudden has slow hydraulics.When I first start it up they work fine (steering,brakes,3pt) but after a few seconds the 3 pt is slow and quivers as it raises.Steering and brakes work but not like they should.Any suggestions ?




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Bob

08-03-2005 07:32:59




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 Re: 4020 hydraulics in reply to bah, 08-03-2005 06:40:04  
The first thing to do is drain the rear end of oil and remove the hydraulic oil strainer and clean it. If there is a problem with one or more of the brake pads, there will be brake material and probably metal in the sump and on the screen.

If this is the case, get the brakes fixed before continuing to use it, or you will risk further ($$$) damage.

If the strainer is not full of brake pad material, clean and reinstall it, and replace the oil.

Also, change the hydraulic filter. (2, if it is a powershift).

If that doesn't help, you could have a bad transmission pump, a bad main (front) pump, or a high pressure leak-to-sump at one of the SCV's, the steering unit, or the 3-point.

Tests with a flowmeter will narrow that down to the bad component.

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msb

08-03-2005 14:30:01




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 Re: 4020 hydraulics in reply to Bob, 08-03-2005 07:32:59  
The very first thing I would do would be replace the hydraulic filter with all due respect to what Bob has posted and I do have a high regard for Bob and his wisdom.Look the filter over real good.I sometimes cut the old filters open and inspect them first before I go to the trouble of draining the transmission and pulling the suction screen.How long has it been since the hydraulic filter has been replaced? If it has been more than 500 hours of use then certainly start with a new filter.

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