Mic Bailey
Member
Hi, the main boom cylinder on our PPM ATT400 mobile crane is groaning at two different angles as it is extended or retracted. The groaning vibration type noise can be really loud, especially when the fluid heats up. In the mornings it tends to be quieter. Also the cylinder rod has black rings on it, probably caused from from the seals rubbing as the cylinder groans. Please can anyone help us diagnose what may cause this??
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