Mazda Automatic Transaxle JA5A-EL. Manual — part 15

AUTOMATIC TRANSAXLE

K–41

K

Manual Valve

Outline

• The manual valve and selector lever operate simultaneously. It is a valve that distributes optimum line pressure

to the control valve according to the drive ranges.

Operation

• The manual valve is connected to the selector lever mechanically through linkage and switches the oil passage

according to the selector lever movement from the P position to the L range. Line pressure (5) from the oil

pump is always applied to the manual valve.

P position

• Line pressure (5) is not distributed to any of the control valves.

R position

• Line pressure (5) is distributed to oil passage (4) passing the manual valve and is applied to the reverse clutch,

low and reverse brake, and the reduction brake operation pressure.

N position

• Line pressure (5) is not distributed to any of the control valves.

D, S, L range

• Line pressure (5) is distributed to oil passage (1) passing the manual valve and is applied to each clutch and

brake operation pressure according to the gear range.

AME5614A002

K–42

AUTOMATIC TRANSAXLE

Reduction Timing Valve

Outline

• The reduction timing valve switches the oil passage according to the operation of the reduction timing solenoid.

By this valve, the reduction reducing valve pressure adjustment point changes.

Operation

• Spring force is applied to the bottom end of the valve and pushes the valve upward. Conversely, reduction

timing solenoid pressure (15) is applied to the top end of the valve and pushes the valve downward.

• When the reduction timing solenoid is in the OFF condition, the reduction timing valve is positioned on the

upper side by spring force, and back pressure of accumulator control pressure B (22) is applied to oil passage

(39) of the reduction reducing valve.

• When the reduction timing solenoid is in the ON condition, the reduction timing valve is positioned on the lower

side below and oil pressure is not applied to the reduction reducing valve.

AME5714A007

AUTOMATIC TRANSAXLE

K–43

K

Low Clutch Accumulator

Outline

• The low clutch accumulator locks the low clutch smoothly.

Operation

• The low clutch accumulator piston is pushed upward by spring force.

Selecting N position to D range

• While in the N position, accumulator control pressure (42) is applied to the bottom end of the accumulator

control piston and pushes the piston upward.

• When D range is selected from the N position, line pressure (43) is applied to the low clutch and low clutch

accumulator. When line pressure (43) is applied to the upper part of the accumulator piston, the piston begins

to move downward. While the piston is moving, line pressure (43) is pressurized gradually and the shock from

the low clutch locking will decrease.

AMU0517A552

K–44

AUTOMATIC TRANSAXLE

High Clutch Accumulator

Outline

• The high clutch accumulator locks the high clutch smoothly. Also, when shifting up to third gear and shifting

down from third gear, the high clutch accumulator controls the locking and releasing timing of the high clutch.

Moreover, the high clutch accumulator plays the role of locking the low and reverse brake smoothly when

selecting R position.

Operation

• The high clutch accumulator piston is pushed upward by spring force.

Forward drive ranges

• While in the forward drive range, accumulator control pressure (21) is applied to the bottom part of the

accumulator control piston and pushes the piston upward. When shifting up to third gear, line pressure (44) is

applied to the high clutch and the high clutch accumulator. When line pressure (44) is applied to the upper part

of the accumulator piston, the piston begins to move downward. While the piston is moving, line pressure (44)

is pressurized gradually and the shock from the high clutch locking will decrease.

R position

• While in the R position, the accumulator switch valve switches the line pressure passage, and low and reverse

brake operation pressure instead of high clutch operation pressure is applied to the high clutch accumulator. As

a result, when locking the low and reverse brakes, the operation pressure (line pressure) gradually pressurizes

and decreases the select shock.

Modifier Accumulator

Outline

• The modifier accumulator has the role of absorbing the pulsation from the pressure modifier pressure.

Operation

• The accumulator piston is pushed to the right by spring force. Conversely, pressure modifier pressure is

applied to the right side of the piston and pushes the piston to the left side. The accumulator piston is

maintained by the balance of pressure modifier pressure and spring force. The piston moves to the left when

the pressure modifier pressure becomes high and absorbs the pressure. Conversely, when the pressure

becomes low, the piston moves to the right and compensates for the pressure insufficiency.

AMU0517A553