Häst - XXL Pulley

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When we wanted to test our tripod to 12,000 pounds, we simply could not find a suitable pulley on the market to help us with this test. The solution, make our own! That effort resulted in our pulley 1.0, which worked, but needed some improvements. To the left you will see our version 2.0. The biggest change is the continuous becket at the bottom. This allows for termination of the rope at any location, thus improving the balance of the load on the pulley. Other features include double sealed roller bearings. This decision was a result of the fact that when we used a commercial pulley with sleeve bearings on a change of direction and only a 1400 pound load, we ruined it! We did not want to spare any expense in making a piece of equipment of which we could be proud to produce. In addition, when the pulley is being assembled, each unit is individually shimmed so that the sides of each pulley will not rub the frame. If any maintenance is required, the shaft can be removed by pulling the cotter pin at one end. However, please consult with us before this attempt is made!

The hook has a working load rating of 10,000 pounds with a 4:1 safety ratio. Rope that is either 1/2 inch or 5/8 inch can be used, although 1/2 inch is preferred. The pulley set can be rigged for ratios from 2:1 up to 10:1.

To access a PDF with suggested configurations for each ratio, click: Pulley Rigging Suggestions

Order a Pulley Set (pair) on either our Accessories or XXL and Zoo Equipment ORDER page.

On 29 November 2017, our version 1.0 pulley was subjected to a destructive load test at Mazzella Lifting Technologies. You can see the results to the right. While there were no visible cracks or other damage noted to the aluminum parts that we produce, the point of failure was obvious, with the very heavy steel hook opening up. This was quite the surprise. Even the 1/2 inch nylon rope did not appear damaged.

The amount of load that resulted in this failure was measured at 48,391 pounds. Even though the hook to the right was the point of failure, the hook at the far end also underwent a certain amount of plastic deformation that resulted in permanent damage.

Bottom line: We feel confident in putting a 10,000 WLL rating on this pulley with a 4:1 safety ration. To view the test report, simply click on: Pulley Load Test

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