Jack Ratings

mkirsch

Well-known Member
My truck has an 1800lb slide in camper in the bed, and weighs in at around 3000lbs on the rear axle empty. 5000lbs or so.

My big 3-ton floor jack (i.e. rated to lift 6000lbs) would not lift one rear wheel (i.e. about 2500lbs).

It took the 3-ton floor jack AND a 4-ton bottle jack to get the tire off the ground!

When I let pressure off the floor jack to lower it, the bottle jack came down too. It could not hold the wheel up all by itself either!

On what planet do jack manufacturers think these jacks would lift their rated capacities?
 
I sure would never trust that bottle jack again. It should have held the load even overloaded. The rating is the lift capacity. Holding, it should take much more unless the seals failed and oil came out around the ram. Once lifted the check valve should have been seated so no pressure was on the relief. Between the check and the needle valve it should have held pressure indefinitely. If so get it fixed or throw it away. Unsafe!
 
Where are these jacks made and how old are they? I'm quite surprised to hear that it wouldn't lift less than it's rated capacity. I guess there's not much liability on anything but jack stands.
 

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