20,000 Posts & Climbing
Join Date: Jun 2009
Location: Sault Ste Marie, Ontario
Re: Loader pressure vs lifting gains
It takes a specific amount of pressure to raise the empty bucket of a loader. Once that pressure is known, a ball park estimate of addition lifting force applied to the payload by the higher pressure can be calculated by using the leverage ratio based on the location of the 3 pins on the arm, or two pins on the arm and the center of the bucket.
Cylinder lifting force:
- Cylinder bore area X Pressure X The Sine of the angle between the cylinder centerline and the line between the cylinder pin on the arm and the post pin on the arm.
- The horizontal distance between the post pin and the cylinder pin on the arm / the horizontal distance between the post pin and the bucket pin, or center of the bucket.
Measure the horizontal distances using a plumb bob dropped from the center of the pins to a length of lumber.
Discount the pressure for lifting the empty bucket from the anticipated pressure available and use the result for the force calculations. Keep in mind that the force calculations are for ONE cylinder. There are two cylinders on a loader. The result after doing the leverage calculations is the estimated payload that can be lifted.
Note that the calculations change as the load is lifted. They're only good for one lift position due to the changing angle between the arm and cylinder, and the changing leverage ratios.
The math is simple. Applying it, not so much.
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