[AT] tractor hydraulic pressure measuring? Dean

[Len Rugen]

On 5/22/2012 9:44 PM, Steve W. wrote:
> John Wilkens wrote:
>> Dean, i installed a good gauge in the pressure line and set the
>> bucket under a heavy (too heavy) load and got a reading of 1800
>> psi.  The empty bucket alone takes 1500 psi to lift.  This is a
>> smallish tractor (TO 35) but doesn't 1800 lbs lift maximum seem a
>> little woosey?    John W.
>>
> 1800 psi seems low for a relief pressure.
>
> That number is NOT the same as maximum lift though. The only real way to
> get that number would be to measure it directly with a scale.
>
> That is because although you could set down and calculate out the load
> using the psi number you also need to add in the piston diameter,
> cylinder angle, amount of leverage that the loader has based on the
> pivot angles of the cylinder against the pivot of the loader boom,
> friction losses, plus a few more things.

Well, when I saw 1800 I thought that was the working pressure for that 
age of equipment, now you have confused me :-)  My  Bush Hog M246 loader 
is only rated to lift about 1700 lbs.

I would guess that this tractor would be limited by the front spindles 
and axle capacity, lots of that age stuff was broken up with heavy 
loader use.