Expedition 4WD V8-281 4.6L SOHC (1998)
Accumulator: Description and Operation
Part 1 Of 2
Part 2 Of 2
The transmission uses two accumulators:
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1-2 Accumulator-The 1-2 accumulator 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 the pressure
is high enough to overcome line pressure. The top of the piston is exhausted to the sump.
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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 2-3 accumulator piston, holding the piston down until clutch pressure is high enough to overcome it. The middle
section of the piston is exhausted to the sump.