The piston rod stops moving when the wheels are positioned under one of the horizontal propped surfaces, therefore the cylinder dont have to bear {HEAD ~ the weight} of {TAIL ~ the head member} all the time 
of
The piston rod stops moving when the wheels are positioned under one of the horizontal propped surfaces , therefore the cylinder do nt have to bear { HEAD ~ the weight } of { TAIL ~ the head member } all the time
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH