HYDRAULIC SYSTEM [LA4AX-EL (CD4E)]
BUE051700000N25
Structure
• The hydraulic system uses ATF to cool, lubricate, and provide hydraulic pressure to the hydraulic circuits within the transaxle.
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1
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Gasket
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2
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Pump drive shaft
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3
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Seal (6 required)
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4
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Pump support component
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5
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Pump body
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6
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Pump seal
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7
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Pump gear
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8
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Pump drive gear insert
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9
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Pump body separate plate
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Oil Pump
• The pump provides the volume of ATF required to charge the torque converter, main control valve body, cooling system, lubrication system, and hydraulic apply devices.
• The transaxle uses a positive displacement gear and crescent-type pump which is shaft-driven by the torque converter.
Fluid Level and Filter
• ATF from the sump area (formed by the transaxle case and converter housing) flows through a filter to the pump.
• The filter has a recirculation port connected to the main control area of the case and receives ATF from the main regulator drain port. This provides ATF under pressure to aid the pump in higher efficiency operation.
• A thermostatic fluid control valve prevents foaming of ATF by maintaining a sump level below the rotating components.
• The two-piece chain drive cover prevents foaming by not allowing the chain to rotate in the ATF.
• A magnet on the underside of the chain cover collects unwanted magnetic material.
Main Control
• The main control houses the hydraulic valves and solenoid valves. These valves direct ATF flow, restrict ATF flow and change ATF pressure.
• The main control receives signals from the solenoid valve body and changes those signals into hydraulic actions. These actions control the operation of the hydraulic clutches and intermediate and overdrive band component, and supply lubrication to the transaxle.
Low/Reverse Accumulator
• The low/reverse accumulator cushions the application of the low/reverse clutch when the transaxle is shifted to either 1st gear or reverse gears.
2-4 Accumulator
• The 2-4 accumulator cushions the shift feel during intermediate and overdrive band applications.
Forward Accumulator
• The forward accumulator cushions all forward automatic shifts.