Isuzu N-Series. Manual - part 951

7B-40 Automatic Transmission (Smoother)

Special Tools

Illustration

Tool No.

Tool Name

5-8840-0007-0

Grip

9-8522-1269-0

Oil Seal Installer

5884000070

9852212690

Automatic Transmission (Smoother) 7B-41

Rear Oil Seal (5-Speed)

Components

 

Removal

1. Remove the rear propeller shaft assembly.

• Refer to “Rear Drive Propeller Shaft”. 

2. Remove the parking brake cable.

• Refer to “Parking Brake”. 

3. Remove the parking brake drum.

• Refer to “Parking Brake”. 

4. Remove the coupling driver and O-ring.

• Carefully release the caulking (two points) of

the lock unit, and remove the lock nut by fixing
it with the flange holder (5-8840-2043-0).

5. Remove the parking brake assembly.

Legend

1. Oil Seal

4. Coupling Driver

2. Parking Brake Cable

5. Parking Brake Drum

3. Parking Brake Assembly

6. Rear Propeller Shaft Assembly

N7A0293E

N7A0294E

7B-42 Automatic Transmission (Smoother)

• Refer to “Parking Brake”. 

6. Remove the rear oil seal.

Installation

1. Apply engine oil to the outer circumference of a

new oil seal, and then use the installer (5-8840-
2750-0) to press-fit the oil seal to the rear cover. 

• Apply Besco L2 grease to the lip of the oil seal. 

Caution:
Take care to avoid damaging the oil seal lip. 

2. Install the parking brake assembly.

• Refer to “Parking Brake.” 

3. Install the coupling driver.

a. Apply engine oil to the O-ring, and then install

the coupling driver and O-ring. 

b. Using a new lock nut, use the flange holder (5-

8840-2043-0) to tighten the lock nut. 

Tighten:
289 N

⋅m (29.5 kg⋅m / 213.2 lb⋅ft)

• After tightening the nut to the specified torque,

align the nut lip with the V-groove of the shaft
tip and caulk it (2 points) securely using a chisel
(chisel tip shape: approx. 1 mm in radius 

× 60

degrees) so that the caulking is more than 5
mm in length and the lip gap is less than 2.5
mm. 

Caution:
After caulking, check the caulking of the nut. If any
cracks are discovered, replace the lock nut and re-caulk. 

N7A0295E

N7A0294E

N7A1072E

Automatic Transmission (Smoother) 7B-43

4. Install the parking brake drum.

• Refer to “Parking Brake”. 

5. Install the parking brake cable.

• Refer to “Parking Brake”. 

6. Install the rear propeller shaft assembly.

• Refer to “Rear Drive Propeller Shaft”. 

Tightening Torques

N7A0298E