Kubota GR1600EU Workshop Manual page 144

GR1600EU, WSM
Forward
(1) Cylinder Block (Pump)
(2) Swashplate
(3) Piston
(4) Cylinder Block (Motor)
Stepping on the speed control pedal to the forward position inclines the HST trunnion arm, causing the pump
swashplate (2) to incline as shown in the figure.
The pump pistons rotate with the pump cylinder block (1) while reciprocating.
At this time, the pump pistons generate pressure by reciprocating motion. The pressure generated is transmitted
to the motor pistons (Port B - Port D).
Pressure from the port D thrusts the motor pistons to the surface of the inclined thrust ball bearing, causing them
to slide on the inclined surface.
This causes the motor cylinder block (4) and the motor shaft engaged with it to rotate.
This causes the machine to move forward. The inclination of the pump swashplate (2) determines the motor shaft
speed.
(5) Lubricating Orifice
(6) Check Valve (Forward)
(7) By-pass Valve
(8) Transaxle Case
(9) Oil Strainer
(10) Check Valve (Reverse)
2-M5
TRANSAXLE
(11) Charge Relief Valve
(12) Filter Cartridge
(13) Charge Pump
9Y1210595TXM0006US0
KiSC issued 11, 2013 A