What oil is in the jack?
You must never fill salad oil or pure engine oil in the hydraulic jack. Usually refers to a hydraulic jack, a hydraulic oil with the designation HLP 46 use. However, some manufacturers also prescribe other oils. The operating instructions can give you an accurate description of the oil that is suitable for your jack.
How a hydraulic jack works
Mostly jack is hydraulic. The operation of this hydraulic jack is as follows: There is a liquid inside the jack. These are often oil. With the help of a system, this oil is compressed upon actuation of the lever by a subsequent pumping action. As a result, the liquid is compressed. As a result, the rod shoots up and thus pushes the vehicle upwards. Consequently, a jack is merely a transfer of pressure. This pressure can cause the car to be pushed up.
It creates high pressure and enormous forces in the jack. A first sealing system must, therefore, be integrated. The liquid can not push through these seals to the outside, and the jack, therefore, remains in operation. However, if the seal is worn, fluid leakage or pressure drop occurs.
Tip! The jack will not work anymore. In such a case, your jack must be repaired by a specialist workshop or it will require the purchase of a new jack.
Refill oil in a hydraulic jack
If your jack no longer has enough oil, you need to top up the fluid. The perfect way to do this is as follows:
- Place the jack on a level, horizontal surface.
- Attach the pump lever to the drain valve. The open end of the pump lever is shaped so that you can put it on the square of the drain valve.
- Turn the drain valve gradually counterclockwise. Place an absorbent cloth around the drain valve, such as a rag, to prevent the floor from being contaminated by any escaping oil.
- Once you have opened the drain valve, gently pull it out. The oil filling is sufficient if now oil escapes, or this is up in the opening.
If this is not the case, the cleaning flap is placed under the drain valve and then removed by levering with a large screwdriver on the hydraulic cylinder cover plate.
| step | Hints |
|---|---|
| refill oil | Use a dabbed, large screwdriver to pry open the oil filler plug gently. Do not work with sharp or pointed objects to prevent damage to the oil filler plug. Now top up the high-quality hydraulic oil until the oil appears in the drain valve opening. Never fill in lubricating oil, engine oil or brake fluid, etc. |
| make the jack ready for use again | Turn the drain valve back in, reinsert the filler plug, and several times move the lever holder up and down along with the pump lever to lubricate the internal mechanism sufficiently. Then replace the cover plate over the hydraulic cylinder. If necessary, bleed the jack again. |
Bleed the hydraulic jack
In the hydraulic system, air bubbles can penetrate and affect its function. Either the jack can, therefore, jerky lowering or lifting or seem stiff. To prevent this, you must do the following to bleed your hydraulic jack:
- First, close the drain valve completely to bleed the hydraulic cylinder.
- Then use the pump lever to pump up the jack.
- The drain valve is now opened, and the saddle is slowly pushed down.
- Close the drain valve.
- Avoid sharp objects to open the drain valve.
The jack then has to work correctly and efficiently. Repeat the deaeration process if that is not the case.
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