Kubota B2650HSDC Workshop Manual page 173

B2650HSDC, B3350HSDC, WSM
(Continued)
The pump and the motor are joined in a closed hydraulic circuit. Most of oil circulates with in the main oil circuit.
A little oil lubricates and oozes out from the clearance between the moving parts in the case. Then oil in the main oil
circuit of the HST needs to be supplied a want.
So all of oil fed from hydraulic pump flow to hydraulic transmission for charging and cooling.
The charge oil aids smooth operation of pistons for pump and motor. The charge oil passed to charge relief valve
port. The rest of oil passed through the charge relief valve into the HST housing. And overflow oil from HST housing
return to the transmission case.
2-M7
TRANSMISSION
9Y1210822TRM0006US0
KiSC issued 05, 2014 A