[AT] more HP guaranteed!/now front end on the ground.

[charlie hill]

John, that was the beauty of the old Allis Chalmers "Traction Booster"
system.  On the Snap Coupler tractors it worked from spring tension on
the drawbar and on the 3pt hitch tractors it used a rock shaft that 
connected
the front of the 3pt lift arms.  The system kept the lift system always 
tight against
the load and immediately reacted to load changes.  When the pressure went up 
in
the system from load tension the lift would quickly raise the implement 
until the load
decreased.  It was essentially a "draft system" but it worked by load not 
depth.  When they
were right they were wonderful.

Charlie

-----Original Message----- 
From: John Hall
Sent: Thursday, March 16, 2017 8:47 PM
To: Antique tractor email discussion group
Subject: Re: [AT] more HP guaranteed!/now front end on the ground.

To me its a different world when using 3 pt tillage tools, as they tend
to pull down on the tractor increasing traction and contributing to a
wheel stand. The last field I chiseled saw the front end come up so fast
I couldn't even attempt to stop it or let it down easy, it was
practically instantaneous. Several times I ran out of traction and
started spinning, but that normally happens slowly. When I start
spinning I either raise the machine slightly or let it spin through the
"tight" ground---one of those thing you decide at the moment as to how
the tractor is handling it. Eventually I want to make a weight bracket
for the 4020, if you have ever hung the factory weights on one of them
you know how bad of an idea stackable bolt on weights are. I've got
plenty of suitcase weights I can borrow off my grain drill.

John Hall

On 3/16/2017 1:42 PM, charlie hill wrote:
> Here you go, for anyone who feels like working through the math.
> http://www.agmachinery.okstate.edu/tractors/TractionTractorPerformance.pdf
>
> -----Original Message-----
> From: Stephen Offiler
> Sent: Thursday, March 16, 2017 1:10 PM
> To: Antique tractor email discussion group
> Subject: Re: [AT] more HP guaranteed!/now front end on the ground.
>
> Talking about slip... rang a bell.  Ah-ha, Nebraska tractor tests.  They
> include % slip in the drawbar test.  Without actually checking, my memory
> agrees with Charlie's stated 10-15% range.
>
> SO
>
>
> On Thu, Mar 16, 2017 at 12:52 PM, charlie hill 
> <charliehill at embarqmail.com>
> wrote:
>
>> Just my opinion but I think sometimes when your front end is coming up
>> while
>> pulling a load it is from not allowing enough wheel slip.  I read an
>> article
>> in
>> Progressive Farmer many many years ago about proper wheel slip for 
>> maximum
>> efficiency.  If I remember right it was somewhere in the neighborhood of
>> 10
>> to 15%.
>> Air pressure is the key and it varies by soil type.  I just don't 
>> remember
>> exactly what the specifics are.
>>
>> Charlie
>>
>> -----Original Message-----
>> From: John Hall
>> Sent: Tuesday, March 14, 2017 8:11 PM
>> To: Antique tractor email discussion group
>> Subject: Re: [AT] more HP guaranteed!/now front end on the ground.
>>
>> To be honest, I have no idea. Come to think of it I had one of the rears
>> repaired last year (new tube and patch the rim around valve stem), and I
>> don't remember if I checked to see if both sides are equal. Wouldn't
>> hurt to check. I'm down right now until I get the new radiator
>> installed. I will say we don't really let the sidewalls bulge out much
>> when pulling heavy loads.
>>
>> John
>>
>> On 3/14/2017 12:02 PM, charlie hill wrote:
>>> John,  how much air pressure do you run in the rear tires?
>>>
>>>
>>> Charlie
>>>
>>> -----Original Message-----
>>> From: John Hall
>>> Sent: Friday, March 10, 2017 4:19 PM
>>> To: Antique tractor email discussion group
>>> Subject: Re: [AT] more HP guaranteed!
>>>
>>> Thinking it might give the 4020 more pep than a turbocharger. Course I
>>> can't keep the front end on the ground as it is pulling the chisel plow.
>>> Gonna need more front end weights I guess.
>>>
>>> John
>>>
>>>
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