2004 DAEWOO LACETTI Gear

5A1 – 28IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
Drive Range – Fourth Gear
In Drive 4, transaxle drive is via the input shaft and
clutches E and C. The elements of this transaxle function
are as follows:
S Clutch E is engaged to drive the rear planetary gear
carrier.
S The rear planetary gear carrier drives the rear ring
gear.
S The rear ring gear carrier drives the differential
gear.
Control
Clutch E Engaged
Solenoid 2 will be switched OFF. Line pressure, which is
supplied by the reduction valve, flows to the inlet port of
clutch valve E. Fluid will then pass through the clutch valve
and clutch E will engage.Clutch C Engaged
EDS 4 will be switched OFF causing the fluid level to be
high. Line pressure will be directed to the safety valve,
clutch valve D and holding valve D. Clutch valve C and
holding valve C will engage as pressure flows through the
safety valve.
Lock–up Clutch
Solenoid valve 2 is turned ON and the line pressure control
valve spool will be depressed. Fluid will now flow through
the torque converter pressure valve.
As a result, the oil pressure behind the converter lock–up
clutch piston and in the turbine zone is equal. The direction
of flow is through the turbine shaft and through the space
behind the piston, to the turbine chamber.

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 29
DAEWOO V–121 BL4
Drive Range – Fourth Gear ; Emergency/Substitute Mode

5A1 – 30IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
Drive Range – Fourth Gear ;
Emergency/Substitute Mode
In Drive 4, transaxle drive is via the input shaft and
clutches E and C. The elements of this transaxle function
are as follows:
S Clutch E is engaged to drive the rear planetary gear
carrier.
S The rear planetary gear carrier drives the rear ring
gear.
S The rear ring gear carrier drives the differential
gear.Control
Clutch E Engaged
Solenoid 2 will be switched OFF. Line pressure, which is
supplied by the reduction valve, flows to the inlet port of
clutch valve E. Fluid will then pass through the clutch valve
and clutch E will engage.
Clutch C Engaged
EDS 4 will be switched OFF causing the fluid level to be
high. Line pressure will be directed to the safety valve,
clutch valve D and holding valve D. Clutch valve C and
holding valve C will engage as pressure flows through the
safety valve.

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 31
DAEWOO V–121 BL4
Drive Range – Third Gear ; Emergency/Substitute Mode

5A1 – 32IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
Drive Range – Third Gear ;
Emergency/Substitute Mode
In Drive 3, transaxle drive is via the input shaft to clutches
B and E. The elements of this transaxle function are as fol-
lows:
S Clutches B and E are engaged to drive the rear sun
gear and rear planetary gear carrier clockwise.
S The clockwise rotation of the rear sun gear and rear
planetary gear carrier will cause the front planetary
gear to rotate in the same direction.Control
Clutch B Engaged
In Park and Neutral solenoid valves 1 and 2 are both ON.
Pressure control solenoids (EDS) 4 and 6 are also turned
ON.
When EDS 6 is ON, the fluid supplied from the reduction
valve flows to the safety valve, clutch valve B and holding
valve B. The oil that is supplied to the inlet port of the clutch
valve presses on the valve spool. Line pressure then flows
to the holding valve and check ball, engaging clutch B.

ZF 4 HP 16 AUTOMATIC TRANSAXLE 5A1 – 39
DAEWOO V–121 BL4
INPUT SHAFT & SHIFT GEAR

5A1 – 40IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
1. Inner Disc Carrier F
2. Clutch Plate F
3. Line Clutch Disc F
4. Clutch Outer Disc F
5. Spring Disc
6. Stop Ring
7. Cup Spring
8. O–ring
9. O–ring
10. Piston D
11. Slotted Nut
12. Roller Bearing
13. Adjust Ring
14. Bearing Plate
15. Roller Bearing
16. Spur Gear
17. Piston D
18. Spring Disc
19. Snap Ring
20. Clutch Plate D
21. Cup Spring
22. Line Clutch Disc D
23. Spring Disc
24. Disc Carrier C/D
25. Pitting Key
26. Line Clutch Disc C
27. Clutch Outer Disc C
28. Cup Spring
29. Line Clutch Disc C
30. Snap Ring
31. Piston C
32. Cylinder C
33. Snap Ring
34. Front Ring Gear
35. Oil Tray
36. Front Planetary Gear
37. Front Sun Gear
38. Snap Ring
39. Needle Bearing40. Rear Planetary Gear Set
41. Snap Ring
42. Rear Sun Gear
43. Needle Bearing
44. Snap Ring
45. Piston B
46. Clutch Plate B
47. Clutch Outer Disc B
48. Line Clutch Disc B
49. Spring Disc
50. Piston Ring
51. Inner Disc Carrier E
52. Needle Bearing
53. Snap Ring
54. Clutch Plate Disc E
55. Line Clutch Disc E
56. Clutch Outer Disc E
57. Spring Disc
58. Retainer Ring
59. O–ring
60. Oil Dam
61. Cup Spring
62. O–ring
63. Piston E
64. O–ring
65. Input Shaft
66. O–ring
67. O–ring
68. Piston
69. Oil Dam
70. O–ring
71. Cup Spring
72. Stop Ring
73. Shim
74. Needle Bearing
75. O–ring
76. Piston Ring
77. Rear Cover

5A1 – 42IZF 4 HP 16 AUTOMATIC TRANSAXLE
DAEWOO V–121 BL4
GEAR SHIFT CONTROL
1. Selector Control Lever
2. Gear Shift Knob
3. Cover
4. Step Gate Slider
5. BTSI Button
6. Spring7. Positioning Spring
8. Solenoid
9. Base Plate
10. T/A Lever
11. Select Cable
12. Cable Fastener