A ram descends due to {TAIL ~ its own weight} and {HEAD ~ pressure} of a rod side cylinder chamber of a hydraulic cylinder which vertically moves the ram is detected by an oil pressure detector 
A ram descends due to { TAIL ~ its own weight } and { HEAD ~ pressure } of a rod side cylinder chamber of a hydraulic cylinder which vertically moves the ram is detected by an oil pressure detector
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH