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2.1 OVERVIEW
417W620A
417W621A
(1) Oil cooler
(2) Oil fi lter
(3) HST (Hydrostatic transmission)
(4) Pump shaft
(5) Shift lever assembly
(6) Motor shaft
(7) Oil fi lter
417W622A
The HST (Hydrostatic transmission) consists of the vari-
able capacity pump, fi xed capacity motor, oil fi lter, charge
pump, and check & high pressure relief valve.
2. HST (HYDROSTATIC TRANSMISSION)
However, the HST needs very clean oil. Therefore, unlike
other hydraulic systems, it has its own oil fi lter and oil fi lter
cartridge (10μ) for the inlets of the charge pump and vari-
able capacity pump. To prevent the rise of the oil tempera-
ture, the oil cooler is also installed to the drain line. The
power is transferred to the 16T gear in the transmission
case. The rotating direction and speed of the motor shaft
change according to the movement of the HST’s swash
plate through the HST rod as the main shift lever moves.
(8) Oil tank
(9) Transmission case
(10) HST pulley
(11) Check & high pressure relief valve
(for forward driving)
(12) Pump shaft (input)
(13) Motor shaft (output)
(14) Swash plate shaft
(15) Check & high pressure relief valve
(for reverse driving)
(16) Check & high pressure relief valve
(for forward driving)
(17) Charge pump
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