First check the bleed off valve, the thing you turn to let the jack down. If it is not tight , the oil will by pass under pressure and the jack will not lift. If that is not the problem then check toe oil in the jack. if the oil is low it may not lift a load, Could be an air bubble also. if you can't find anything else wrong try turning the jack upside down.
To lift heavy objects with ease.
You would have to lift the load by hand!
it is the creation of an idea to analyze forces,torque's and synthesis of a screw jack to perform work or lift load with maximum efficiency.the optimum and short procedure to design the screw jack includes only two steps are as follows:- 1.determine the diameter of core of a screw. 2.determine the torque required to lift the load.
What is the weight and dimensions of the intended load? What is the heighth of lift?
If become easier to lift a load in a wheelbarrow when the load is towards wheel why
The way they lift the load.
The number of pulleys needed to lift a load varies based on the size of the load. A very small load can be lifted with just one pulley while large loads may require many pulleys to adequately lift the load.
Load Capacity
The maximum load that the crane can lift is 18 metric tons (39,690 pounds), but the crane cannot lift that much weight if the load is positioned at the end of the jib. The closer the load is positioned to the mast (center of rotation), the more weight the crane can lift safely.
No
Inspirations
As close to the load as possible. Note that the closer to the load the fulcrum is placed, the shorter the lift that can be effectuated by the use of the lever.