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Frog Hydraulic Lift Issue: Descends Instead of Lifting - Replaced O-rings, Assembly & Oil Check

ziooober88 62148 10
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Why does my hydraulic jack descend instead of holding when raised, even after replacing the O-rings and checking the oil, and how should the ball valve in part 3 be assembled?

The most likely fault is in the check valve, not the O-rings: the ball should sit directly behind the screw in the small center dimple, and if the ball is flattened or damaged it should be replaced with a similar bearing ball [#17695716] Check the internal piston check valve as well, because it is a ball valve with a special rubber insert and it may be reached from inside the actuator piston [#17698608] A leak between the piston and the oil reservoir is also possible and would let the jack slowly drop [#17698608] The fact that the jack behaved the same after oil was poured in and the piston was cycled points to a valve/sealing fault rather than a lack of oil [#17698470]
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  • Question about missing ball in hydraulic valve assembly

    #1 17695501
    ziooober88
    Level 15  
    Posts: 1155
    Rate: 491
    Hello, colleagues, I have a hydraulic lift as in the photos. I took it apart, replaced the o-rings with new ones and the effect was the same. Those, the lift empty when raised to the very top, begins to descend despite the fact that it should not. The oil is max. There is air in it. What could this be happening? What could be wrong? I don't know how item 3 should be folded? Just like in the picture or maybe the ball should be inside? Because it fell out and I don't know how it was. But I put it together anyway and it didn't work. Oil leaks are nowhere to be found. What could be wrong?

    Frog Hydraulic Lift Issue: Descends Instead of Lifting - Replaced O-rings, Assembly & Oil Check Frog Hydraulic Lift Issue: Descends Instead of Lifting - Replaced O-rings, Assembly & Oil Check Frog Hydraulic Lift Issue: Descends Instead of Lifting - Replaced O-rings, Assembly & Oil Check
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  • #2 17695701
    Anonymous
    Level 1  
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  • #3 17695712
    ziooober88
    Level 15  
    Posts: 1155
    Rate: 491
    I do not know. I got it for repair, but if anyone lost something, I have no idea. That is why I try to understand the subject of how it should look like. The central pin of position 3 has such a recess on both sides for the shot. But there is only one shot. Maybe there should be two sharps there?
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  • #4 17695716
    zyga c
    Level 17  
    Posts: 367
    Help: 10
    Rate: 76
    The ball should be right behind the screw. There is a small dimple where the ball sits centrally. Check the ball for squashing or replace it with a similar one for a bearing.
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  • Tapping the check ball to reseat the valve

    #5 17695723
    Anonymous
    Anonymous  

  • Ball valve seating and function explained

    #6 17695751
    ziooober88
    Level 15  
    Posts: 1155
    Rate: 491
    zyga c wrote:
    The ball should be right behind the screw. There is a small dimple where the ball sits centrally. Check the ball for squashing or replace it with a similar one for a bearing.
    Buddy, what are you talking about?
    jaszto wrote:
    Look carefully at the balls and ball nests, especially item 1.
    Position 3 is tightened and should hold. Put the ball (item 1) into the socket, press it with a non-hardened steel rod and tap it lightly with a hammer. This is how I repaired the 10t lift. In my case, the extreme protection was the extension in the cylinder. In this frog, the protection is probably in pos. 2, tapping the ball will not hurt.
    Buddy, should I hit this ball from position 2 from the pump? She's stiff with this plunger. And let someone explain to me what item 1 is responsible for? What is she doing and what is this ball spring for?
  • #8 17697376
    Anonymous
    Anonymous  

  • Piston rises and slowly leaks down during oil fill

    #9 17698470
    ziooober88
    Level 15  
    Posts: 1155
    Rate: 491
    Thanks colleagues for the suggestions. But I also did such an experiment. I wrung out everything that was in position 1 and position 2. I poured oil into position 1 by lifting the piston up to suck oil. Position no. 3 was closed as it was during work. And the effect was that when I lifted the piston up and poured the oil, the effect was the same as always. That is, the piston popped up and held it gently falling. Does this tell you something?
  • #10 17698608
    saskia
    Level 39  
    Posts: 5759
    Help: 174
    Rate: 1086
    inside there is a piston check valve (a ball with a special rubber) which is also a pump check valve.
    It is most likely accessed from the inside of the actuator piston.
    There may also be a leak between the piston and the oil reservoir.
  • #11 17827792
    ziooober88
    Level 15  
    Posts: 1155
    Rate: 491
    The lift could not be repaired. I mentioned a few things in it but unfortunately it did not bring any improvement. That's why I bought a new working one.
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Topic summary

LABEL_AI_GENERATED
The discussion revolves around a hydraulic lift that descends instead of lifting after the user replaced the o-rings and checked the oil level. The user is uncertain about the assembly of a specific component (item 3) and the placement of a ball that fell out during disassembly. Responses suggest checking the positioning of the ball, ensuring it is seated correctly, and verifying the integrity of the check valves. Some participants recommend consulting hydraulic jack schematics for further guidance. Despite attempts to troubleshoot, the user ultimately decided to purchase a new lift due to the unresolved issues.
AI summary based on the discussion. May contain errors.
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