COMPONENT OPERATION / HST Pump FORWARD / REVERSE SELECTION SOLENOID VALVE
Reverse Selection Solenoid Valve
Spool
The forward/reverse selection solenoid valve controls the pump displacement angle direction and changes the delivery direction (port A or port B) of pressure oil. Pressure oil from the DE pump solenoid valve to control the displacement angle control cylinder acts on the forward/reverse selection solenoid valve. The forward or the reverse selection solenoid valve is excited and the spool is operated according to the signal from the FNR lever. Then, the hydraulic circuit to the corresponding displacement angle control cylinder is connected. Therefore, the pump displacement angle is controlled and the delivery direction of pressure oil is changed.
Forward Selection Solenoid Valve
To Port B (Reverse) From Charging Pump
HST Pump
To Port A (Forward) T4FC-03-08-005
Displacement Angle Control Cylinder
Displacement Angle Control Cylinder
A
Forward/Reverse Selection Solenoid Valve Reverse Selection Solenoid Valve View A
Port B (Port A at Opposite Side)
Forward Selection Solenoid Valve
T4FG-03-04-001
T3-4-7
