Toyota
Dodge Durango
 Service Manual
Transmission and Transfer Case » Description and operation
Accumulator

DESCRIPTION

The accumulator (Fig. 46) is a hydraulic device that has the sole purpose of cushioning the application of a band or clutch. The accumulator consists of a dual-land piston and a spring located in a bore in the transmission case. The 3-4 accumulator is located in a housing attached to the side of the valve body (Fig. 47).

OPERATION

Both the accumulator and the 3-4 accumulator function the same. Line pressure is directed between the lands of the piston (Fig. 48), bottoming it against the accumulator plate. The accumulator stays in this position after the transmission is placed into a Drive  position. When the 1-2 upshift occurs (Fig. 49), line pressure is directed to the large end of the piston and then to the kickdown servo. As the line pressure reaches the accumulator, the combination of spring pressure and line pressure forces the piston away from the accumulator plate. This causes a balanced pressure situation, which results in a cushioned band application. After the kickdown servo has become immovable, line pressure will finish pushing the accumulator up into its bore. When the large end of the accumulator piston is seated in its bore, the band or clutch is fully applied.

Fig. 44 Boost Valve Before Lock-up Fig. 44 Boost Valve Before Lock-up

Fig. 45 Boost Valve After Lock-up Fig. 45 Boost Valve After Lock-up

Fig. 46 Accumulator Fig. 46 Accumulator

1 - ACCUMULATOR PISTON

2 - PISTON SPRING

Fig. 47 3-4 Accumulator and Housing Fig. 47 3-4 Accumulator and Housing

1 - ACCUMULATOR PISTON

2 - 3-4 ACCUMULATOR HOUSING

3 - TEFLON SEALS

4 - PISTON SPRING

5 - COVER PLATE AND SCREWS

NOTE: The accumulator is shown in the inverted position for illustrative purposes.

    More about «Description and operation»:

    42/44 Re transmission

    Fluid

    Torque converter

    Oil pump

    Valve body

    Accumulator

    Pistons

    Front clutch

    Rear clutch

    Overdrive clutch

    Overrunning clutch

    Planetary gearset

    Bands

    Servos

    Gearshift mechanism

    Converter drainback valve

    Powertrain control module (pcm)

    Electronic governor

    Governor pressure curves

    Overdrive off switch

    Dodge Durango Service Manual / Transmission and Transfer Case / Description and operation / Accumulator

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