Daewoo Musso. Manual - part 255

5A-52 AUTOMATIC TRANSMISSION

POWER FLOW - DRIVE 2 AND MANUAL 2

In Drive 2 and Manual 2, transmission drive is via the input shaft and forward clutch cylinder. The elements of the
transmission function as follows :

The C2 clutch is applied to drive the forward sun gear.

The forward sun gear drives the short pinion anti-clockwise.

The short pinion drives the long pinion clockwise.

The B1 band is applied holding the reverse sun gear stationary therefore the long pinion ‘walks’ around the

reverse sun gear taking the internal ring gear and output shaft with it in a clockwise or forward direction.

The C4 clutch is applied to bypass the 3-4 OWC and provide engine braking on overrun.

Control

To maintain this arrangement in the steady state solenoids and valves are activated as follows: Solenoid S1 is
switched Off. S2 is switched On.

Solonoid S1 is switched Off. S2 is switched On.

Drive (line pressure) oil from the manual valve engages the C2 clutch.

When S1 switches off , S1 oil pressure, which is derived from line 500 pressure, moves the 3-4 shift valve to

the left. At the same time S1 oil is directed to the 1-2 shift valve which moves the valve to the second gear
position.

2nd oil (line pressure) from the 1-2 shift valve is directed to the band apply regulator valve, and to the 2-3 shift

valve.

The band apply regulator valve supplies 2nd oil (regulated to line pressure multiplied by the valve ratio) to the

band apply feed (BAF) circuit.

Band apply feed oil is directed to:

- The outer apply area of the front servo

- The 1-2 shift valve to provide an exhaust port when the transmission is shifted to first gear

- The 3-4 shift valve for use when the transmission is shifted into fourth gear

Drive (line pressure) is routed through the 3-4 shift valve to apply the C4 clutch.

Refer to figure 5.5 and table 5.6.

Table 5.6 - Engaged Elements - Drive 2 and Manual 2

Gear State

Drive 2 and Manual 2

1-2

OWC

3-4

OWC

CLUTCH

ELEMENTS ENGAGED

AUTOMATIC TRANSMISSION 5A-53

5A-54 AUTOMATIC TRANSMISSION

POWER FLOW - DRIVE 3 AND MANUAL 3

In Drive 3 and Manual 3, transmission drive is via the input shaft to the forward clutch cylinder. The elements of the
transmission function as follows :

The C2 clutch is engaged to drive the forward sun gear.

The C1 clutch is engaged to drive the planet carrier.

The forward sun gear and the planet carrier are driven clockwise at the same speed therefore there is no

relative motion between the sun gear and the pinions.

The ring gear and output shaft are driven in a clockwise or forward direction at input shaft speed.

The C4 clutch is applied to bypass the 3-4 OWC and provide engine braking on overrun.

Control

To maintain this arrangement in the steady state solenoids and valves are activated as follows:

Solenoid S1 is switched Off. S2 is switched Off.

With S1 and S2 switched Off, the 2-3 and 3-4 shift valves are held in the third gear position by line 500

pressure.

The 1-2 shift valve is held in the third gear position by S1-S2 oil pressure.

2nd oil (line pressure) from the 1-2 shift valve is directed to the band apply regulator valve. and to the 2-3 shift

valve.

The band apply regulator valve supplies 2nd oil (regulated to line pressure multiplied by the valve ratio) to the

band apply feed (BAF) circuit.

Band apply feed oil is directed to:

- The outer apply area of the front servo

- The 1-2 shift valve to provide an exhaust port when the transmission is shifted to first gear

- The 3-4 shift valve for use when the transmission is shifted into fourth gear

2nd oil at the 2-3 shift valve is directed to the 3rd oil circuit.

3rd oil from the 2-3 shift valve is directed to the clutch apply regulator valve, and to the 4-3 Sequence Valve.

The clutch apply regulator valve supplies oil (regulated to line 500 pressure multiplied by the valve ratio) to the

clutch apply feed (CAF) circuit.

The CAF oil is directed to:

- The C1 clutch

- The C1 bias valve

- The 4-3 sequence valve

At the 4-3 sequence valve the CAF oil becomes band 1 release feed (B1R-F) oil, and is directed through the

3-4 shift valve to the spring end of the 4-3 sequence valve, and to the release side of the front servo piston to
hold band 1 off.

Drive (line pressure) is routed through the 3-4 shift valve to apply the C4 clutch.

Refer to figure 5.6 and table 5.7.

Table 5.7 - Engaged Elements - Drive 3 and Manual 3

Gear State

Drive 3 and Manual 3

1-2

OWC

3-4

OWC

CLUTCH

ELEMENTS ENGAGED

AUTOMATIC TRANSMISSION 5A-55

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