CAT 301.6C excavator jerky boom cylinder

[rockstar91]

I bought a used CAT 301.6C hydraulic excavator and while using it, the boom cylinder had a jerky movement. This happens when the arm is extended to its fullest and especially when the excavator is hot. I checked everything; the engine is fine, no leaks, and the filter is changed. I

Let me know what your thoughts are...

Thanks!