Further, by the use of the foregoing accumulator for replenishment, when the hydraulic cylinder is withdrawn, it is extended a required length merely by detecting the lower limit value of the appropriate travelling range and the height of the boom is restored to {HEAD ~ the upper limit value} of {TAIL ~ the same range} automatically 
of
Further , by the use of the foregoing accumulator for replenishment , when the hydraulic cylinder is withdrawn , it is extended a required length merely by detecting the lower limit value of the appropriate travelling range and the height of the boom is restored to { HEAD ~ the upper limit value } of { TAIL ~ the same range } automatically
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH