[AT] JD 4020 lift problems

[John Hall]

 Cecil, we've moved that lever in the past when we were having lifting 
issues. After 40 years of being here, we just might ought to read the manual 
to see what the various settings are for! Generally I don't ever remember 
having to move the draft control once it was set. We used to use this 
tractor for some mowing and may have adjusted it differently than when it 
was set-up for plowing. We had a couple more big Deere's but other than a 
scrape blade they only saw heavy 3pt duty so there was no need to ever 
adjust them.

John
----- Original Message ----- 
From: "Cecil Bearden" <crbearden at copper.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Monday, January 04, 2010 8:23 AM
Subject: Re: [AT] JD 4020 lift problems


> John:
> JD 4010 &4020 have a screwball type of depth control.  The shaft that
> connects the lower links goes through the rear end case and bends when
> it gets loaded.  The amount it bends causes the draft control to raise
> the lift. Sounds like your boom lift is causing the depth control to
> work backwards. I think a selection on the small lever under the front
> of the seat will take care of some of that.
>
> Cecil in oKla
>
> John Hall wrote:
>> When we try to lift something really heavy with the 3pt hitch with dad's
>> 4020, it has become a struggle lately. You have to rev up the engine a 
>> bit
>> and then it will start letting it back down instead of holding it. I 
>> don't
>> suspect the pump since we have no trouble lifting equipment with 
>> cylinders
>> on it. We really notice it when we have the boom on it. So you can
>> understand, this boom is made out of the tongue of a log cart, to put it 
>> in
>> size perspective. We always knew when we were lifting too much as the
>> tractor would lift it's front end off the ground.
>>
>> Anyway, does this sound like a valve with an issue or possibly bad rings 
>> on
>> the lift cylinder? Maybe something with the load and depth control?
>>
>> John Hall
>>
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