Tilt Circuit; Mast Backward Tilting (Solenoid Valve: Off) - Toyota 7FBEF 15 Service Manual

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Tilt circuit

1. Mast backward tilting (Solenoid valve: OFF)

(1) When the key switch is turned ON and the tilt lever is operated to the backward tilting direction, the
tilt spool is pulled and moves to the left side in the figure.
(2) Then the hydraulic oil in the pump port flows through the spool and compresses the tilt logic valve
spring to open the valve.
(3) As the result of (2), the circuit connecting the pump port and the C3 port is opened. Since the C3
port is connected to the RH chamber of the tilt cylinder, the pump pressure is applied to contract the
tilt cylinder.
(4) On the other hand, when the tilt spool moves to the left side in the figure, the circuit connecting the
C2 port and the tank port opens. C2 port is jointed to the LH chamber of the tilt cylinder.
(5) The action in step (3) applies the pump pressure to the RH chamber of the tilt cylinder.
Consequently, the hydraulic oil in the LH chamber of the tilt cylinder is led from the C2 port to the
tank port through the control valve spool as if pushed by the piston inside the tilt cylinder.
Tilt spool
Tilt cylinder
C2
Tank port
Pump port
C3
Check valve
Solenoid valve
Tilt logic valve