Isuzu KB P190. Manual - part 1131

UNIT REPAIR (JR405E)  7A4-47 

Free length – 36.4 mm (1.433 in) 

Linear diameter – 1.2 mm (0.047 in)  

 

 

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Reassembly steps 

Coat the parts with ATF before installing them. 
1. Bearing 

Install the bearing into the low clutch drum. 

 

 

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2. Snap ring 

Install the snap ring to the low clutch drum. 

 

 

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3.  Low one-way clutch  

Install the low one-way clutch to the low clutch drum. 

 

 

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NOTE: 
The flanged side of the low one-way clutch must face the 
outside. 

7A4-48  UNIT REPAIR (JR405E) 

 

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4.  Side plate  

Install the side plate. 

 

 

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5.  Snap ring  

Install the snap ring to the low clutch drum. 

 

 

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•  Attach the low one-way clutch inner race to the low 

clutch drum in the opposite direction of the normal 

position. 

•  Rotate the one-way clutch inner race clockwise. It 

should turn smoothly with little resistance. 

• Rotate the low one-way clutch inner race 

counterclockwise. 

It should immediately lock (rotation is impossible). 

If it does not, check the low one-way clutch installation

direction. 

Inspect and replace the low one-way clutch if required. 

•  Remove the low one-way clutch inner race. 
•  Reverse the low clutch drum. 
 

 

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6.  Low clutch piston 

•  Install new seal rings to the low clutch piston. 

 

UNIT REPAIR (JR405E)  7A4-49 

 

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•  Install the low clutch piston to the low clutch drum. 

 

 

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7.  Return spring  

Install the return spring to the low clutch piston. 

 

 

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8.  Cancel cover  

•  Carefully center the cancel cover and install it. 

NOTE: 
If the cancel cover is not centered, the cover outside seal 
ring gum will be forced into the low clutch piston area 
where it will be damaged. 

 

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•  Install the spring compressor to the low clutch. 

Spring compressor: 5-8840-2759-0 

 

 

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9.  Snap ring  

•  Use the spring compressor to carefully force the cancel

cover down. 

NOTE: 
To avoid damage to the return spring, use only as much 
force as is required to press the cancel cover into place. 

•  Install new snap ring to the low clutch drum. 

 

7A4-50  UNIT REPAIR (JR405E) 

 

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10.Dish plate, drive plates, driven plates, and retaining

plate 

Install the low clutch dish plate (1), the 2 mm thick driven

plate (2), the 7 drive plates (3), the other 6 driven plates (4),

and the retaining plate (5). 

NOTE: 
The dish plate side with the identification mark must face 
the driven plate. 

 

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11.Snap ring 

Install the snap ring to the low clutch drum. 

 
NOTE: 
Ensure the attachment direction of dish plate is correct. 

 

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Inspection 

•  Insert the low one-way clutch inner race to the low clutch 

drum. 

•  Force compressed air (390 kPa/4.0 kgf/cm

2

/57 psi) 

through the oil passages of the low one-way clutch inner 

race to check low clutch operation. 

If the low clutch does not operate, the seal rings may be

damaged or the parts may have been installed in the

wrong order. 

•  Measure the clearance between the low clutch retaining 

plate and the snap ring. 

If the clearance is outside the specified range, replace 

the existing plate with a new plate of the proper size 

(thickness). 

Low clutch retaining plate and snap ring clearance: 

0.9~1.3 mm (0.035~0.051 in) 

Available low clutch retaining plate thicknesses 

3.8 mm (0.150 in) 

4.0 mm (0.157 in)