[AT] tractor hydraulic pressure measuring? Dean
Steve W.
swilliams268 at frontier.com
Tue May 22 22:20:34 PDT 2012
Cecil R Bearden wrote:
> The early tractor's relief valve was replaced with the later relief
> valve with no problems. I cannot find a reference to the pressure of
> the to-35 pressure, but the MF-35 was 2800 . The valve was usually
> referred to 2750. This seems to be correct in my memory of working on
> the early Ferguson and fords. I spent a lot of hours in a tractor shop
> working on the hydraulics. I would suggest looking to see if you have
> a control valve that has another relief in it that could be allowing the
> oil to bypass the control and go back to sump when you load it above
> 1750 psi.
>
> Early loaders had about a 2 in diameter piston in the cylinder and the
> cylinder operated at a 45 deg angle usually. If you work on the 300
> psi difference, and take the area of the piston, it figures out to 1884
> lbs of thrust combined. At a 45 degree angle, this would be the cosine
> of 45 (.707) x 1884 = 1331 lbs to raise a load. This is about 1/2 yd of
> sand, and that is about what the old tractors would handle. It sounds
> ok to me...... A large round bale or hay would be nearly flatten the
> early tires. The rear tires would have to be ballasted and then put a
> box blade on the rear also.
>
> I am sure someone will try to shoot holes in my figures, but it is a
> close approximation.
> Cecil in OKla
>
>
Sounds about right. I'm just wondering if this is the tractors system.
John says his tractor has a "front mount pump" The 35 I have has an
internal pump for the hydraulics.
I've seen more than a few broken axles/spindles and front castings from
heavy loads on these tractors. They are a handy tractor but loaders are
not really fun on them. Especially the ones that don't have power steering !
--
Steve W.
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