[AT] Three point hitches and Dean's commentary

[Dean VP]

Bob:

Interesting info on the 40. I failed to mention that there is a single
spring on the 20 and 30 series tractors to that pulls down on the rock shaft
arms but I wouldn't call it a very effective down pressure. The 800 series
hitches didn't have this spring at all to pull down on the rock shaft crank
arms. 

I'm not exactly sure how effective this spring is in providing any really
adequate down pressure on an implement such as a rear blade or something
similar. A true hydraulic down pressure would be much more useful. 

I have owned three 1948 Cubs at one time and am down to one but if there is
any tractor that needs the improved traction performance of a three point
hitch this is the tractor. The rear end of a Cub is really so light that it
is ineffective at pulling any kind of load. I got my lawn mower Garden
Tractor stuck in the mud one spring and the stinking Cub couldn't get it
out. Had to get a bigger tractor to pull it out. 

I recall that Ford sold an accessory that allowed the operator to use the
three point as a jack. That implies down pressure on the three point. Am I
dreaming that up?  

Dean A. Van Peursem
Snohomish, WA 98290

What people can dream, people can do! George W. Bush

www.deerelegacy.com

http://members.cox.net/classicweb/email.htm




-----Original Message-----
From: at-bounces at lists.antique-tractor.com
[mailto:at-bounces at lists.antique-tractor.com] On Behalf Of
SEITHR at denison.edu
Sent: Saturday, May 22, 2004 6:49 AM
To: at at lists.antique-tractor.com
Subject: Re: [AT] Three point hitches and Dean's commentary

The JD 40 had ENORMOUS springs to create down pressure on the 3-point. Also
a 
draft-sensitive feature that could be turned on or off (with a wrench). 

The down pressure was enormously useful when using something like a Planet
Jr. 
seed drill (for truck crops). It ensured positive contact between the seeder

and the ground. Using the same implement on, say, a small Ford or Ferguson
ran 
the risk of skipping.

My aftermarket 3-pt hitch on the Farmall Cub of course has pressure up and 
down, but no draft control whatsoever. I imagine trying to use it with a 
pick-up plow would be frustrating. Someday, I hope to fabricate a small 
pick-up disk for it, and I think that would probably work OK.

Note for historical record: The "regular" Cub disk was a cute little 4 1/2 
foot double-acting trailer disk, which was probably pretty good, but there's

no way I could ever find a place to store such an animal. The Fast-Hitch 
version was a 4 1/2 or 5 foot single-action pick-up unit. Nice, but I don't 
think many have survived, and I certainly don't have a fast hitch. No, my 
notion is, someday, to buy one of those bargain-type little pick up disks
you 
find at TSC and other outlets and cut it down to fit the Cub. 

That's for when I find some cheap rental land near my place and can indulge
my 
fantasy of having a small produce farm. Good luck?

Bob Seith


Grant:

Appreciate your comments and none of the two cylinder era three point
hitches of any variety had power down that I am aware of. I'm not sure of
the 40 through 430 series tractors but I doubt they had it. I know on some
tractors the operator could use the three point as a jack. In fact I think
Ford/Ferguson sold an accessory for this very function. I'm not familiar
enough with the other manufacturer's products to know which had the power
down feature. I surely can see where the power down feature would be very
helpful at times. 

The load sensing feature was more important for the smaller tractors such as
the Ford/Ferguson and the JD 40. They tended to be light in the rear end and
the increase in traction provided by the three point was mandatory. That
wasn't as critical on the larger Two Cylinder Row Crop tractors since the
typical weight distribution was 70% to the rear. The early power lifts on JD
were either all down or all up. Then the power-trol allowed control of the
in-between but no real closed loop depth control. That is why gauge wheels
were required on the implements. Then the 20 Series tractors gave full three
point closed loop control and the gauge wheels were not needed as much.
_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at



_______________________________________________
AT mailing list
http://www.antique-tractor.com/mailman/listinfo/at