Hydraulic staircase lifts can be purchased from mobility specialists or direct from the manufacturer. Some of the most popular brands include Stannah and Lift.
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First you should check with local manufacturing plant. It may be they are looking to sell one. Another good place to look is in a metal fabrication plant. There are also several magazines and websites that are involved in the metal fabrication industry. You can also order one from Harbor Freight Tools or Northern Tools.
Hydraulic motors are commonly used in military vehicle wheel motors, crane drives, high powered lawn trimmers, and winches. William Armstrong was one of the first to construct a hydraulic motor.
By "Hydrostatic" systems one tends to mean "closed loop hydraulic systems". That is hydraulic systems comprising a pump and motor hwere the pump supplies the motor whose return side supplies the pump. The speed and direction of rotation of the hydraulic motor being changed according to the displacement angle of the variable displacement axial pison pump. "Open loop hydraulic systems" on the other hand comprises various motors often one or more "linear motors" (hydraulic cylinders). When using hydraulic cylinders in hydraulic systems one needs a reservoir to be able to hold the various volume need of the cylinder. (the displacement on the piston side is usually bigger than the rodside). The reservoir needs a "breather" due to the varous displacement needs hence the "open system".
Hydraulic drive systems like gear pumps, rotary vane pumps, screw pumps, bent axis pumps etc. One real life example of hydraulic pumps is the brake master cylinder in a car. You also see hydraulic pumps in excavators.
One may look into getting the repair done by a professional for a hydraulic pallet jack. Sometimes jacks are too old to be repaired and need to be replaced. There is a great danger in using a faulty hydraulic pallet jack that could cause sever injuries.