Isuzu N-Series. Manual - part 949

7B-32 Automatic Transmission (Smoother)

Disassembly

1. Remove the band clip, and disconnect the sensor

connector from the transmission harness. 

 

2. Drain the fluid coupling. 

• Any oil that is not drained can leak out later, so

drain oil carefully. 

3. To facilitate work, use a chain block, belt, or other

means to secure the transmission with the front of
the vehicle faced up. 

4. Push in the grommet of the solenoid &

transmission fluid temperature sensor harness
located in the top of the clutch housing in order to
put the both harness and connector inside the
clutch housing.

5. Remove the bolt, and then remove the gasket,

cover, spring, and piston and plunger sub
assembly. 

• Tighten the four bolts equally. 

6. Remove the snap ring of the piston and plunger

sub assembly, and remove the piston, D-ring, and
plunger. 

Legend

1. Reverse Switch

6. Solenoid & Transmission Fluid Temperature Sensor

2. Gear Shift Select Sensor

7. 2-4-6-R Shift Solenoid

3. Input Shaft Speed Sensor

8. 1-3-5 Shift Solenoid

4. Gear Shift Select Sensor

9. Turbine Speed Sensor 

5. Neutral Switch

10. Select Solenoid

N7A1051E

Automatic Transmission (Smoother) 7B-33

 

7. Screw an M8 bolt onto the oil pump assembly work

screw, and pull out the unit uniformly at three
points. 

• When positioning the oil pump assembly, have

the part that is towards the front of the vehicle
facing downwards. 

8. Remove the sealing at two points and the O-ring

from the oil pump assembly. 

Legend

1. Cover

6. Piston

2. Spring

7. D-ring

3. Snap Ring

8. Gasket

4. Brake Band Support

9. Bolt

5. Plunger

N7A1052E

N7A1053E

N7A1054E

7B-34 Automatic Transmission (Smoother)

 

9. Remove the thrust washer and thrust bearing.

Check the thrust bearing for the following. 

• Smoothness of rotation 
• Noise
• Damage, visible abnormality of rubber, etc. 
• Discoloration of rolling element 

10. Disconnect the sealing from the clutch assembly

turbine shaft 

11. Remove the bolt, band clip, connector, and

grommet indicated by the arrows from the oil pump
assembly, and remove the solenoid and
transmission fluid temperature sensor harness. 

12. Taking care not to damage the press-fit portion of

the oil seal, remove the oil pump oil seal. 

13. Remove the turbine speed sensor.
14. Remove the clutch assembly.

• Holding the clutch hub so it is not pulled out,

remove the assembly. 

 

15. Remove the bolt that holds the pin and remove the

brake band. 

• If the brake band wear surface is cracked,

burned, or otherwise abnormal, replace the
brake band. 

Legend

1. Bolt
2. Seal Ring
3. Seal Ring
4. Thrust Washer
5. Thrust Bearing
6. Oil Pump Assembly
7. O-ring
8. Oil Pump Oil Seal 

N7A1055E

Legend

1. Clutch Assembly
2. Thrust Bearing

N7A1056E

N7A1057E

Automatic Transmission (Smoother) 7B-35

16. Remove the input shaft speed sensor.

Assembly

1. Set the brake band inside of the four clutch housing

pins, insert the pins into the brake band, and install
the bolts. 

Tighten:
23 N

⋅m (2.3 kg⋅m / 17 lb⋅ft)

2. Taking care of the assembly orientation, place the

thrust bearing on the clutch housing. 

• At this time, apply oil (Besco ATF III) to the

clutch housing contact surface and to the thrust
bearing. 

3. Apply oil (Besco ATF III) to the inner circumference

of the brake band and the outer circumference of
the clutch hub, and then insert the clutch assembly
into the shaft so that it fits inside the brake band.

• The drum part and the hub part of the clutch

assembly can be separated, so take care that

they are not separated when you assemble the
clutch assembly. 

• Put the transmission in neutral, and confirm

that the hub can be rotated by hand. 

 

4. Insert the plunger into the piston and secure it with

the snap ring, install the D-ring, and install the
piston and plunger sub assembly. 

N7A1058E

N7A1058E

Legend

1. Clutch Assembly
2. Thrust Bearing

N7A1057E