Hydraulic System, Brakes

FLUID PUMP
The transmission uses a gerotor design front pump support and gear. The pump is more efficient at lower engine speeds. It is made of aluminum. The pump provides the volume of fluid needed to charge the torque converter, main control assembly, cooling system and lube system. Pump pressure is regulated by the main regulator valve. The pump also has an internal boost circuit.





FILTER
All fluid drawn from the pan by the pump passes through the filter. The filter and its accompanying seal are part of the fluid path from the sump (pan) to the fluid pump.





MAIN CONTROL VALVE BODY
The main control valve body houses three electronic solenoids:
- two shift solenoids.
- Torque Converter Clutch (TCC) solenoid.





ACCUMULATORS

1-2 Accumulator
The 1-2 accumulator (in the case) is used to soften the 1-2 shift by absorbing some of the pressure directed to the intermediate clutch. Constant line pressure is applied to the middle section of the 1-2 accumulator piston, opposing the intermediate clutch pressure until this pressure is enough to overcome line pressure. The top of the piston is exhausted to the sump.

2-3 Accumulator
The 2-3 accumulator is used to soften the 2-3 shift by absorbing some of the direct clutch pressure. Forward clutch pressure is applied to the top side of the accumulator piston, holding the piston down until direct clutch pressure is enough to overcome it. The middle section of the accumulator is exhausted to the sump. The 2-3 accumulator also helps control forward engagement.