inching valve and the operation slide valve. The oil out of the torque converter is
cooled by and oil radiator and used to lubricate the hydraulic clutches and finally
returns to the oil tank.
In the neutral, the circuit from the operation slide valve to the clutches is
intermitted, and the pressure valve is opened to let the oil only flow into the torque
converter. When the operation slide valve lies at its forward or backward position, the
circuit from the operation slide valve to either the forward clutch or the backward
clutch is closed accordingly, thus causing corresponding clutch come to work. When a
clutch is at work, another must stop working, i.e. its spacers and friction pieces must
be disengaged each other and be lubricated and cooled. When the inching valve is
operated through stressing the inching pedal, a part or most of the oil in the clutches
flows into the oil tank through the inching valve rod. The oil circulation for the torque
converter then is the same as that in the neutral.
4.8 Reduction Gear & Differential (See Fig.4-8)
To oil cooler
High temperature oil port
From oil cooler
Low temperature oil port
Lateral pressure hole of the hydraulic clutch
Oil temperature gauge hole
Oil discharging plug
Inching valve
Backward lamp switch
Neutral gear switch
Filter
Fig.4-8 Reduction gear and differential
-39-
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