The end supports of the support roller for {HEAD ~ the lower belt} rest on a hydraulically actuated piston which enables this support roller to be displaced towards {TAIL ~ the other support roller} 
The end supports of the support roller for { HEAD ~ the lower belt } rest on a hydraulically actuated piston which enables this support roller to be displaced towards { TAIL ~ the other support roller }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL