Quote:
Originally Posted by GeorgiaHybrid
NEVER, EVER get under a truck, car, trailer or anything else supported by hydraulics only. Always use jack stands placed under the frame. The jacks are more than capable of lifting the trailer but don't bet your life on a Chinese seal.
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Could not agree more.
And for me it's not just about seals being Chinese, because I've been around heavy equipment and jacks since I started working in a shop at 12, and procedures have always been to assume a hydraulic jack can and will fail.
I have reluctantly changed tires a few times while vehicle was supported by hydraulic jack, but made sure to stay clear at all times, and always placed the extra tire/wheel under vehicle just in case the jack failed.
One thing I want to add is that I've personally witnessed a vehicle drop when a support crumbled (the guy put it on concrete blocks -- a horrible idea) and it drops so fast that there is no time to react, not to mention get out of the way. Gravity is incredibly fast. Don't ever count on being able to anticipate a failure because you won't.
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