2-M8
ZD18(F) · ZD21(F) · ZD28(F), WSM
TRANSAXLE
(C) ZD28(F)
[Serial No. Affected: above 20001]
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 charge oil sent from the hydraulic pump passes oil cooler and after that, the cooled oil is sent to the control
valve. The oil is sent to the HST housing by passing the oil filter after pressure is controlled with the regulator valve.
The charge oil aids smooth operation of pistons for pump and motor. And overflow oil from HST housing return to
the transmission case.
(1) Oil Strainer
(2) Transmission Case
(3) Hydraulic Pump
(4) Oil Cooler
(5) Control Valve
(6) Regulator Valve
(7) PTO Clutch
(8) Oil Filter Cartridge
(9) Check and High Pressure
Relief Valve
(10) Lubricating Orifice
(11) Cylinder Block (Pump)
(12) Swashplate
(13) Piston
(14) Cylinder Block (Motor)
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