Crane Boom Drift

[NelsOnn]

There's been a slow, subtle drop in boom position over time and it throws off precision when doing repair lifts or holding a load in a fixed spot, checked with the hydraulics nd they don't seem to be leaking
Is this usually a seal issue, or could it be something electronic like the control valve not holding pressure properly or what?, because its really starting to cost me time and sweat

 

[FloodingLights]

It could be worn seals, but if there's no leak, it might be a control valve issue not holding pressure, electronics or internal bypass could also be causing that drift

 

[kiliman.jaro]

Start with a cylinder bleed down test if you can, just to rule that out before digging into the valve body