47 48 from twisting in the clockwise direction beyond the position illustrated in fig5 due to the limit stops 66 and 67 the guide wheel blades 47 and 48 are fixed in their guide position if the medium stream flows towards their front side 51 if the medium stream flows towards the rear side 52 of the guide wheel blade 47 then the latter moves out of the guide position illustrated using continuous lines into the throughflow position indicated by the dashed line in the throughfow position the guide wheel blades partially rest against one another in addition the guide wheel blades are substantially arranged in the peripheral direction in the throughflow position indicated by the dashed line during start up the oil located between the blades of the pump wheel flows outwards due to the centrifugal force is deflected and hits on the blades of the stopped turbine wheel the kinetic energy of the oil stream is converted into a rotary force the turbine wheel starts to rotate and delivers kinetic energy to the planetary gear connected downstream the oil emerging from the turbine wheel against the direction of rotation now hits on the guide wheel and is supported against the blades of the guide wheel said blades being bent opposite to the pump wheel and the turbine wheel and could turn the guide wheel against the direction of rotation of the.