Automatic transmission-16
Figure 3.9 manual-operated valve 3.
1-2 shift valve (refer to Figure 3.10) has two position status. It must be in the position (2, 3, 4) for the convenience of raising
gear in 1
st
-Gear. It is using for all 1-2 and 2-1 shift.
Through the power supply of S1 and (or ) S2, the 1-2 shift valve can acquire its On/Off status.
During 1-2 shift period, drive the transmission fluid from manual-operated valve to the 2
nd
-Gear loop. During the shifting form
2 to 1, the brake belt is engaged and drain the oil through the 1-2 Gear shift valve.
When in 1
st
-gear position, the 1-2 gear shift valve operates with the 3-4gear shift valve (described as follows) combinedly to
separate the clutch C4; if in 2
nd
-Gear position, engage the clutch C4. When select the manual Gear-1, the clutch C4 engages with
the rear brake belt (B2).
3 1-2 shift valve
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