[Solved] Bleeding Frog Car Lift: Resolving Oil Leakage & Actuator Issues (Main Cylinder O-Ring Replacement)

Hello to all forum members. I know that the topic has already been rolled several times, I have read all the topics, but I still can't cope with my lift.
The hoist started leaking on the main cylinder. So I drained all the oil, unscrewed the `` baniaczek '', took out the actuator and changed the o-ring, because it was a bit damaged. I washed everything nicely with gasoline, flooded with hydraulic oil and the hatch! The lift is splashing with oil through the hole in the `` baniaczku '', but it has no intention of pushing the actuator.
I tried to add oil through the piston, through the actuator dropper - it did not work. After all, I did not take apart anything else, and the lift worked, only it was leaking!
I took apart the plunger, all other moving parts; there are two balls, a spring and a mushroom. I washed it, put it back together and history repeats itself ...
maybe I am making a venting error somewhere? Or maybe somewhere else on the way ....
I feel sorry to throw him away - he used it so much, and he had nothing special to say ...
I attach photos of the lift;

Why are you checking it without the reservoir cap?
Pour it with oil, plug it with a plug, pump it in a horizontal position until the piston extends.
How a few cm will come out. then put it vertically with the actuator down and unscrew the screw to lower the jack and push the piston.
The air should go to the reservoir through the valve for lowering the jack.
To be sure, repeat the venting twice, i.e. pump in a horizontal position, and vent in a vertical position with the piston down.
If air in the lines does not allow the pump to suck oil, this can be purged by manually pulling the piston while pumping, then suction on the piston will draw oil into the pump.
Of course, you need to bleed later as above.
Well, unless our leak between the cylinder and the tank.

Thanks a lot. Only when I put the cork on, the pressure pushes it all the way up to the ceiling. But I have not tried this method yet. I will try today ...

grzegorz041 wrote:

Thanks a lot. Only when I put the cork on, the pressure pushes it all the way up to the ceiling. But I have not tried this method yet. I will try today ...

If the pressure in the tank increases significantly, the pump may suck air through the valve to lower the jack.
Tighten it a little harder before inflating.
Such a pump without oil is not very tight and can then suck air even through the o-ring, especially if you used gasoline for rinsing, so you degreased all surfaces, which makes them not very tight.

I see. Only the cork throws away with the oil. I probably poured too much ...
I have a moment only on Saturday, so I'll do it. He will apply your advice ....

One more question. There is a valve on the side with a mushroom, screw and spring in it. It says 'Do not adjust'. I tried to translate but I don't know what that means. Should I tighten or loosen it somehow?

"Do not addjust" means not to regulate, so don't mess with it.
This is what you made the knife do, and that's why the jack doesn't work.
It is possible that it is some kind of safety valve that does not allow the jack to overload.
If you damaged it, maybe it is not holding the wall and the oil from the pump comes back to the reservoir instead of pressing it on the plunger.

Yesterday I tired the jack a bit, unfortunately with poor results ...
As for this valve, everything is as it was - 100% undamaged. Of course, it was taken apart, but I put it back together exactly as it was. But should it be tightened all the way or should there be some slack?
And how much oil to pour into it. Just by eye, or the right amount?

Maybe you did something wrong or too little when folding it and the oil escapes from the cylinder into the reservoir.
Remember that oil is denser than air and even with a small leak, the pump will suck air through the leak more easily than oil.

The screw you weren't supposed to touch was adjusting the pressure valve.
When you started, unscrew it, clean it and screw it completely. See then. Then it will have to be adjusted.

Screw clean and fitted. I tightened it all the way. I tried to bleed as you advised. In fact, the horizontal piston goes about 2 cm. forward. I turn it vertically and something splashes and moves like air and oil.
When you press down on the plunger, it really bulges the rubber plug and wants to push it out. In addition, the piston that is pumped fires to the upper extreme position. Is it normal?

Without twisting the plunger. Assume what it should be like and the end is to work.

grzegorz041 wrote:

Screw clean and fitted. I tightened it all the way. I tried to bleed as you advised. In fact, the horizontal piston is about 2 cm. forward. I turn it vertically and something splashes and moves like air and oil.
When you press down on the plunger, it really bulges the rubber plug and wants to push it out. In addition, the piston that is pumped fires to the upper extreme position. Is it normal?

When pressing the plunger, keep the plunger pressed down so that the air does not accumulate in the pump, because later when you pumping again, you will push it back into the cylinder.
The air in hydraulic systems acts as a spring which causes delays in the operation of the piston and various other problems, e.g. the problem with lowering the jack to the end of the lower position.

If you vent the system properly, the plug will not be pushed out, because it is the compressed air from the cylinder entering the tank that causes the oil volume to increase.

If, when turning the jack, you had the piston pressed all the way, and the pump with the piston pressed, then there would be no air there, and now it is a path to push it out.

Thanks. You explained it to me very well, but I give up. Tried venting today for probably over 4 hours, with breaks for breakfast and lunch. Nothing of that. Normally it is a nightmare!
He slips something in him and that's it.
I called a guy from the Internet who regenerates such lifts. He said PLN 100. The new 120 ..., so it does not pay off.
An exhibition on allegrosz, maybe someone will buy for a pittance .....

The jack is sold. Case closed. Thank you for all hints and commitment ...