Hoping someone can help or have experience of this problem. Having been breaking out rock for two days with hydraulic hammer my JS145 had developed a creaking sound. At first thought is was creaking pin so jumped out and re-greased all pins. Noise still there, seemed to be worst when dipper moved back and forth but its not coming from dipper. Seemed to be from around cab somewhere, then tracking and other movements started making noise. Assume its hydraulic issue, perhaps pump? Switched machine off in case of more damage from pump failure/filings etc. Any ideas?