I have an older Cat 304.5 mini-ex that has a serious vibration issue. I had a hydraulic cylinder start leaking, removed it and had the seals replaced. Reinstalled and finished the job, hauled it back to the yard. Sat for a few weeks, started it up, immediate super loud and strong vibration that shakes the whole cab. Checked hydraulic fluid level, was a bit low, topped it off. Everything functions fine, but this vibration can't be good. It was previously so quiet you could converse with someone in a normal voice standing next to the machine. Any ideas?
Good day Could be your pump coupling, can you listen & trace the source with a stethoscope or long screwdriver. Kind regards Uffex
Thank you for your suggestion Uffex, I have not yet been able to try, but I will! Ron