Isuzu N-Series. Manual - part 950

7B-36 Automatic Transmission (Smoother)

5. Apply oil (Besco ATF III) to the clutch housing hole

and piston and plunger sub assembly, insert the
piston and plunger sub assembly, and position the
brake band so the plunger tip comes into contact
with the brake band support. 

 

6. Set the spring inside the piston, install a new

gasket on the cover, and temporarily tighten the
bolt so the spring is not compressed. 

7. Apply oil (Besco ATF III) to the turbine speed

sensor O-ring and clutch housing hole, and install
using the bolts. 

Tighten:
9 N

⋅m (0.9 kg⋅m / 6.6 lb⋅ft)

8. Apply Besco ATF III to the outer circumference of

the oil seal and to the lip, and then use an installer
(9-8522-1269-0) and grip (5-8840-0007-0) to
press-fit the oil seal to the oil pump assembly. 

9. Secure the solenoid and transmission fluid

temperature sensor harness with a bolt and new
band clip, and connect the solenoid connectors. 
Pass the harness grommet through the hole and
install the solenoid and transmission fluid
temperature sensor harness. 

• Make sure the solenoid and transmission fluid

temperature sensor harness wiring is not loose,
and appears as shown in the illustration below. 

10. Apply Vaseline to the outer circumference of the

shaft, open the slit in the sealing, and install the
sealing. 

• Take care you do not damage the sealing by

opening the slit too much. After assembly, push
the slit part inside. 

11. Perform the procedure in step 10 to install the oil

pump assembly sealing at the other two points. 

Legend

1. Cover

6. Piston

2. Spring

7. D-ring

3. Snap Ring

8. Gasket

4. Brake Band Support

9. Bolt

5. Plunger

N7A1052E

N7A1055E

Automatic Transmission (Smoother) 7B-37

12. Apply oil (Besco ATF III) to the thrust washer and

thrust bearing, install them in the clutch assembly. 

• Take care to orient the thrust bearing correctly

(needle down, gauge up) when assembling it,
and follow the correct sequence. 

13. Apply oil (Besco ATF III) to the outer circumference

of the oil pump assembly O-ring, and assemble. 

14. Apply oil (Besco ATF III) to the bore of the clutch

housing, insert a bolt into the work screw hole,
assemble the hydraulic control unit, and tighten
with the bolts. 

• Take care not to damage the O-ring when

aligning the clutch housing bore with the center
of the hydraulic control unit. 

• Align the phase of the oil pump assembly hole

and clutch housing screw hole when
assembling. 

• Take care that the solenoid and transmission

fluid temperature sensor harness does not
become pinched between components during
assembly. 

Tighten:
23 N

⋅m (2.3 kg⋅m / 17 lb⋅ft)

 

15. Insert the solenoid and transmission fluid

temperature sensor harness grommet into the
clutch housing hole. 

16. Check that the clutch assembly turbine shaft can

rotate. 

17. Uniformly tighten the four bolts you temporarily

tightened in step 6. 

Tighten:
23 N

⋅m (2.3 kg⋅m / 17 lb⋅ft)

18. Position the Smoother so it is level and insert the

fluid coupling tab so it engages wit the oil pump
rotor. 

• Take care to avoid damage to the oil pump oil

seal. 

N7A1053E

Legend

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

N7A1054E

7B-38 Automatic Transmission (Smoother)

• Check to make sure that the gap between the

clutch housing installation surface and the fluid
coupling installation surface is no more than 31
mm. 

19. Install the input shaft speed sensor.

Tighten:
9 N

⋅m (0.9 kg⋅m / 6.6 lb⋅ft)

20. Connect the sensor harness connector to the

transmission harness. 

• Install the band clip.

 

N7A1065E

Legend

1. Reverse Switch

6. Solenoid & Transmission Fluid Temperature Sensor

2. Gear Select Position Sensor

7. 1-3-5 Shift Solenoid

3. Input Shaft Speed Sensor

8. 2-4-6-R Shift Solenoid

4. Gear Shift Position Sensor

9. Turbine Speed Sensor 

5. Neutral Switch

10. Select Solenoid

N7A1051E

Automatic Transmission (Smoother) 7B-39

Tightening Torques

N7A1067E