I don't like the way the sling is wrapped around the truss. It looks like it's just passed through some of the cross-braces rather than attached to the main tubes. This definitely isn't 'by the book', but I also think that loader is more than capable of handling that weight. Wouldn't let my mom stand under it though.
In the cab, there appears to be the shadow of an operator.
Another concern is if a hose ruptures -- the whole system can come crashing to the ground without warning. You shouldn't depend solely on the hydraulics to support an overhead load; there should be a secondary means of support or a way to mechanically lock the booms in position. Industrial safety rules generally include very strict requirements for personnel present under machinery.
We can all agree that this "speaker lift" is no where near it's load limit with this pissy little load, it is just the wrong tool for the job.
As a certified operator of many construction machines and have thousands of hours in the seat of various size Sky Traks the statement made that they are not designed to hold any weight at height for any period of time is ludicriss. They are in fact made to lift weight to height and hold at that height untill unloaded, removed or brought back down no matter how long it takes. If the cylinder,valve leaks it needs to be fixed or someone could get hurt or damage to property could happen. I had one fully extended with a load break down. The drive shaft for the main pump came apart It was two days before it was replaced and it did not move a inch. Same with a excavator, I was running one and the valve leaked causing it to bleed down, called the rental place and had another one brought out. When holding pipe in a trench for the workers and it bleeds down thats a no no. get it fixed or get another one. So would I have a problem with a skytrak holding speakers up for a event, as long as the weight limits are ok, no problem.
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