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42hW-201601
CHAPTER 6 HYDRAULIC SYSTEM
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3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
4.10 HST(HYDROSTATIC TRANSMISSION) [HST MODEL]
4.10.1 HST PASSAGE COMPOSITION
(1) PTO valve  (2)HSTlter (3) Oil cooler (4) HST
TheHST(Hydro-StaticTransmission)consistsofthevariablecapacitypump,xedcapacitymotor,checkvalve,
high-pressure relief valve, etc. and it is installed to the transmission to supply turning force to the transmission. The
inputshaftoftheHSTisconnectedtothespringdamperwhichisinstalledtotheywheeloftheenginewiththe
spline. to receive turning force from the engine. Its HST pump is driven by receiving this turning force through the
input shaft of the HST, and hydraulic oil led into the HST is sent to the hydraulic motor to supply new rotating force
tothetransmission.AstheHSTpumpcanadjusthydraulicowvariably,itcanadjustthespeedoftheHSTmotor
variably and the rotating direction of the motor through the internal swash plate for forward and reverse driving.
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