A cam device moves each piston reciprocally and includes a rotating member having a first camming surface which is cylically rotated adjacent {HEAD ~ an end} of {TAIL ~ each piston} 
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A cam device moves each piston reciprocally and includes a rotating member having a first camming surface which is cylically rotated adjacent { HEAD ~ an end } of { TAIL ~ each piston }
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