Hydraulic System
HYDRAULIC SYSTEMThe hydraulic system uses transaxle fluid to cool, lubricate, and provide hydraulic pressure to the hydraulic circuits within the transaxle.
Fluid Pump
The pump provides the volume of fluid 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
Fluid 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 fluid from the main regulator exhaust. This provides fluid under pressure to aid the pump in higher efficiency operation. A thermostatic fluid control valve prevents foaming of fluid 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 fluid. 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 fluid flow, restrict fluid flow and change fluid 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 assembly, 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 reverse gear.
2-4 Accumulator
The 2-4 accumulator cushions the shift feel during intermediate and overdrive band applications.
Forward Accumulator
The forward accumulator cushions the application of the forward clutch when the transaxle is shifted into DRIVE, 2 or 1.
Fluid Pump Assembly Components
Fluid Pump Assembly Components:
