Accumulator

What happens if the hydraulic accumulator of the AMT transmission breaks down

As pressure increases in the circuit, the accumulator piston is allowed to stroke downward in its bore. . If you are seeing sluggish shifting, shift hunting between lower gears and a very loud shudder noise during gear changes, you might want to consider a 1-2 accumulator upgrade and fluid change. The old piston has very small o-rings. An OEM piston can rock in the bore and damage the accumulator. . Accumulators are shift modifiers that affect transmission shift timing and quality. They absorb the initial shock of high pressure in the apply circuit. [PDF Version]