Manual LO

Manual Lo:

MANUAL LO

CONVERTER CLUTCH - RELEASED
OVERRUN CLUTCH - APPLIED
FORWARD CLUTCH - APPLIED
LO ROLLER CLUTCH - APPLIED

Maximum downhill braking can be obtained at speeds below 30 mph (48 km/h) with the selector in Lo (1st) range. Lo/1st oil pressure, which is 1206 kPa (175 psi), is the same as second (2nd) oil pressure because second (D2) oil is still present.

Lo oil from the manual valve is directed to the following:
1. 1-2 Shift Valve Train
2. Lo and Reverse Clutch
3. Lo Overrun Valve

Lo oil at the 1-2 Throttle Valve (T.V.) valve combined with the 1-2 throttle valve spring force will close the 1-2 shift valve at speeds approximately 35 mph (56 km/h) or below. This allows 2nd oil to exhaust, releasing the 2-4 band, and lo oil to apply the lo and reverse clutch.

Lo/1st oil coming off the 1-2 T.V. valve is directed toward the lo overrun valve that regulates lo/reverse oil. This smooths the 2-1 manual downshift for maximum engine braking.

SUMMARY

The forward clutch is applied. The lo and reverse, and the overrun clutch are applied to allow engine braking. The 2-4 band is released, the transmission is in Lo Range - First Gear.