COMPONENT OPERATION ／ HST Motor ４．System pressure control (Automatic speed change control) The check valve selects the higher pressure from the two sides in the main circuit pressure, and is led to the end of the pin built in the spool. When high pressure acts on the pin, the spool is moved to the left. When the HST motor capacity position is smaller position and the main circuit pressure is higher, the spool moves to the left side by acting high pressure to the pin. Then the capacity of the HST motor becomes large.
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５．When the motor capacity changes from small to large the main circuit pressure is affected by the pilot pressure (ΔPc) which itself changes with the engine speed. The higher the engine speed (pilot pressure), the higher the main circuit pressure to change the capacity of the HST motor.
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６．In order to adjust the engine speed when the engine capacity is changed from large to small, the tension of the spring is set by using the adjusting screw.
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