TRANSAXLE
BX1870,BX2370,BX2670,LA203A,LA243A,RCK48(P),RCK54(P),RCK60B,RCK60D,RCK54D, WSM
2-M3
(2) Oil Flow
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.
9Y1210855TXM0003US0
(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)
(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
A: A Port
B: B Port
C: C Port
D: D Port
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