Hydraulic jacks are widely used in different industries and have a variety of applications. They expedite lifting heavy objects and can raise multiple times their own weight. These devices are principally used for lifting vehicles such as cars, trucks, and buses in automotive workshops, but can also be utilised in construction and mining equipment.
What is a Hydraulic Jack and how does it work?
A hydraulic jack is a device that utilises a hydraulic cylinder to create a compressive force. The compressive force is created when a force is applied to the hydraulic liquid, which cannot be easily compressed. This force is then converted into a mechanical force to raise heavy objects.
To put it simply, the device consists of two cylinders connected with a pipe; the first cylinder is a small one and is called the master cylinder which includes the pump that dispenses the liquid into the second cylinder or the larger cylinder, called the slave cylinder. A plunger is inserted into this cylinder that drives the force in an upward motion and raising the object.
Parts of a Hydraulic Jack
Hydraulic jacks have a few components that make it work.
Oil Reservoir
The oil reservoir is the container that houses th hydraulic fluid.
Pump
The pump dispenses the hydraulic fluid from the oil reservoir to the cylinder.
Valve
The valve is what keeps the liquid flowing in one direction.
Release Valve
The release valve decreases pressure by releasing hydraulic fluid back into the oil reservoir when the object is being lowered.
Cylinder
The cylinder is the main component that transforms hydraulic fluid power into mechanical power. It consists of a plunger that reciprocates as the hydraulic fluid moves it, which increases the force on the resultant object.
How to use the Hydraulic Jack?
Using a hydraulic jack is a straightforward process.
Step 1
Place the jack on a solid surface, and ensure it is levelled appropriately.
Step 2
Insert the handle into the hole on the hydraulic jack, and pump the jack handle to raise the saddle.
Step 3
Ensure that the hydraulic jack saddle is correctly positioned under the object.
Step 4
Begin pumping the jack handle to lift the object. Pump continuously until the required height is achieved.
Step 5
Safely lower the object by opening the release valve slowly; this allows the saddle to lower gently, preventing any harm to the equipment or the operator.
Advantages and Disadvantages
Like any other device, hydraulic jacks have its advantages and disadvantages.
Advantages
- Can efficiently lift heavy objects
- Requires minimal mechanical effort because of the hydraulic system
- Quick rise and lower times
- Can be used in a wide range of applications
Disadvantages
- Leaks from hydraulic fluid are possible, which can be detrimental both to the environment and to the jack’s performance.
- The designs of each jack differ by design and application, meaning you may have to purchase a specialised jack for the desired purpose.
Overall, hydraulic jacks are a powerful tool in many industries, including construction, automotive and mining. Its immense power, relatively low weight, and small size make it a popular choice for lifting heavy equipment.
