PM 36 crane is acting weird!

[ShedHappens]

I've got a super strange issue with my PM 36: when it's not loaded with weight, it just goes down.
We've already tried a few things, like replacing a dripping oil pipe, swapping out the piston rod gasket, and even adjusting the valve.
What should we check next? Any advice or comments are welcome!

 

[kiliman.jaro]

I'm thinking internal bypass somewhere in the hydraulic system so take a good look at the main cylinder seals or check valves nd also you mentioned replacing a dripping pipe, so you've probably already bled the system, but one thing is that if there's still air in the lines, it could exaggerate the issue too.


.

 

[safeslinger1022]

Absolutely! It's really important to keep an eye on internal bypass issues or any trapped air. They can definitely throw a wrench in things

 

[FloodingLights]

Could the problem be caused by an internal leak in the control valve or cylinder that only shows when there's no load, and have you tested for that yet?

 

[thetowercrane5pecialist]

Hey, it sounds like you've got a leak or maybe an internal bypass happening in that cylinder. You might want to dive in and check out those piston seals and any of those internal check valves next.