Low (L) Range - 1ST Gear

MECHANICAL OPERATION
In Low (L) range (first gear), the hydraulic system allows line pressure to apply the forward clutch. As line pressure is applied to the forward clutch, the input shaft and the front planetary ring gear become engaged. This allows the clockwise rotation of the input shaft to be transmitted to the front planetary ring gear and then through the front planetary carrier. The clockwise rotation of the front planetary carrier cause the sun gear to turn counter-clockwise. The 1st-reverse brake is applied to prevent the rear planetary carrier from rotating. Because the rear planetary carrier is held stationary, the sun gear causes the rear planetary carrier pinion gears to rotate clockwise on their axis fuming the rear planetary ring gear and output shaft clockwise.

ELECTRICAL COMPONENT FUNCTION
Shift solenoid # 1-OFF
Shift solenoid # 2-OFF

HYDRAULIC COMPONENT FUNCTIONS
Clutch/band apply circuit:
- Forward clutch
Active holding devices:
- 1st-reverse brake
- Forward clutch

With the manual selector in Low (L) range (first gear), line pressure passes through the manual valve and is applied directly to the forward clutch. Line pressure is also applied to the 1st reverse brake to prevent the rear planetary carrier from rotating, and to the forward clutch and 2nd braille accumulators to reduce shock upon clutch engagement. Because the shift solenoid # 1 is de-energized, line pressure is applied to the 1-2 shift valve. The shift solenoid # 2 is de-energized relieving line pressure to the 2-3 shift valve preventing its operation. Line pressure is directed to the following valves and devices:
- Manual valve,
- Forward clutch
- 1st-reverse brake
- 1-2 shift valve
- Primary regulator valve
- Throttle valve
- 2nd brake accumulator
- Forward clutch accumulator
- Secondary regulator valve
- Cooler bypass valve