Manual LO

Manual Lo:

MANUAL LO

CONVERTER CLUTCH - RELEASED
OVERRUN CLUTCH - APPLIED
FORWARD CLUTCH - APPLIED
LO AND REVERSE 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 965 kPa (140 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. Lo and Detent Checkball (9)
2. 1-2 Shift Valve Train (Lo 1st/Detent Valve)
3. Lo and Reverse Checkball (10)
4. Lo and Reverse Overrun Clutch

Lo oil at the lo 1st/detent valve combined with Modulated Throttle Valve (M.T.V.) down and 1.2 throttle valve spring force will close the 1-2 shift valve at speeds below approximately 30 mph (48 km/h). This allows 2nd oil to exhaust, releasing the intermediate band, and lo oil to travel to the lo overrun clutch valve. The lo overrun clutch valve regulates lo oil pressure down to approximately 205 kPa (30 psi) and then directs this regulated oil to the lo/reverse overrun clutch and applies it.

SUMMARY

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