Oil Flow - Kubota BX1860 Workshop Manual

BX1860, BX2360, BX2660, RCK48(P)-18BX, RCK54(P)-23BX, RCK60B-23BX, LA203, LA243, WSM

(2) Oil Flow

(1) Cylinder Block (Pump)
(2) Swashplate
(3) Piston
(4) Cylinder Block (Motor)
(5) Check and High Pressure
Relief Valve (Forward)
(6) Check and High Pressure
Relief Valve (Reverse)
The pump and motor are joined in a closed hydraulic loop and most of oil circulates within the main oil circuit. A
little oil lubricates and oozes out from the clearance between the moving parts of the case. Then oil in the main oil
circuit of the HST needs to be supplied a want.
The oil from the power steering circuit flows into the HST for charging.
The charge oil aids smooth operation of pistons for pump and motor. The charge oil passes through the oil filter
cartridge to charge relief valve port. The rest of oil passes through the charge relief valve into the HST housing. And
overflow oil from HST housing return to the transmission case.
(7) High Pressure Relief Port
Plug (Forward)
(8) Charge Relief Valve
(9) High Pressure Relief Port
Plug (Reverse)
(10) PTO Clutch Valve
(11) PTO Relief Valve
(12) Oil Filter Cartridge
(13) Power Steering Controller
(14) Hydraulic Pump
(15) Flow Priority Valve (Hydraulic
Control Valve)
(16) Position Control Valve
(17) Oil Strainer
(18) Transmission Case
2-M3
TRANSAXLE
A : A Port
B : B Port
C : C Port
D : D Port
KiSC issued 06, 2009 A