This driven shaft 48 is provided with axially extending channels 50, 52 which communicate with {HEAD ~ a hydro pump} 130 that is switchable by {TAIL ~ a valve} 124 
is switchable by
This driven shaft 48 is provided with axially extending channels 50 , 52 which communicate with { HEAD ~ a hydro pump } 130 that is switchable by { TAIL ~ a valve } 124
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH