Branson 4015r - Page 181

4
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9
42hW-201601
CHAPTER 4 TRANSMISSION
4
3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
HST MODEL
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TheenginetorqueistransferredtotheHSTthroughtheHSTinputshaft(pumpshaft)(1).Then,itisconverted
tohydraulicpressureintheHSTtoturntheHSTmotorshaft(2).AstheHSTmotorshaftisconnectedtothe
rangeshiftdriveshaft(6),rotationoftherangeshiftdriveshaftturnsthe26Tgear(3) whichthenturnsthe
rangeshiftdriveshaft(5)throughtheengaged29Tgear(4).
Therefore,theamountofdepressionoftheforwarddrivingpedaldeterminesthehydraulicpressurequantity
fortheHSTinputshaft(pumpshaft),andthischangeofhydraulicpressureleadstoconsequentialchangein
HSTmotorshaftspeed,enablingcontinuousshiftoperation.