I have been following this thread off & on. While getting the Christmas tree today at a local cut your own tree farm. The owner related a twist to this topic.
He was stringing lights on some of his 20' fir trees with 2 helpers. He was operating his JD 4510 as a lift, with a pallet as the platform on pallet forks.
The two helpers were on the platform at full height stringing lights, when the owner was called away from the tractor. Both helpers continued stringing the lights. At this point, the helpers 10 y/o son climbs on the tractor, and grabs the loader joystick. The platform dropped 4' as the hollering started. Fortunately the only injury was to the feelings of the 10 y/o son as the owner corrected his behavior.
As he told the story, I stated my reaction, which is that tractors & 10 y/o kids are not a good combination, nor are folks of any age who are unfamiliar with the equipment at hand.
In this case, no mechanical failure occurred, just the curiosity of a 10 y/o kid.
The failure was that the owner neglected to insure the safety of the helpers depending on him. I imagine that if this technique is used in the future, he will lower the work platform/loader to the ground, prior to leaving the tractor seat.
In a side note, when I arrived to cut down the Christmas tree with chain saw in hand, he stated that due to liability issues, I could only use a hand saw.
"Safety First" I guess.......
WALT