Isuzu KB P190. Manual - part 1205

7C-42  CLUTCH 

TROUBLESHOOTING 

Refer to this Section to quickly diagnose and repair clutch problems. 
Each troubleshooting chart has three headings arranged from left to right. 

(1) Checkpoint  (2) Trouble Cause  (3) Countermeasure 

This Section is divided into five sub-sections: 

1. Clutch Slippage 

2. Clutch Does Not Release Properly 

3. Clutch Shudder 

4. Clutch Noise 

1) Clutch pedal Depressed (Clutch Disengaged) 

2) Clutch pedal Not Depressed (Clutch Engaged) 

5. Oil Leakage 

 

CLUTCH  7C-43 

1.  CLUTCH SLIPPAGE 

 

Checkpoint 

 

Problem 

 

Countermeasure 

 

 

Adjust the push rod play 

 

 

No push rod play in the master 

cylinder 

 

NG 

 

 

Clutch pedal free play 

 

Clean the related parts and/or 
replace the facing  

Replace the transmission front 
cover oil seal 

 

Clean the related parts and/or 

replace the facing 

 

 

Repair or replace the 

transmission front cover 

 

 

Defective transmission front 

cover oil seal 

 

Continued on the next page 

 

Grease or oil adhering to the 

facing 

 

 

Too much grease 

 

 

Transmission front cover 

unevenly worn 

 

 

Release bearing 

 

NG 

NG 

NG 

OK 

OK 

OK 

 

 

7C-44  CLUTCH 

Checkpoint 

 

Problem 

 

Countermeasure 

 

Replace the release bearing

Release bearing broken

Clean the related parts and/or
replace the facing
Replace the crankshaft rear oil
seal

Defective crankshaft rear oil

seal

NG

NG

OK

OK

Grease or oil adhering to the

facing

Clutch diaphragm spring

Replace the clutch pressure

plate assembly

Weak or broken clutch

diaphragm spring

Replace the driven plate

assembly

Worn facing

NG

NG

OK

Facing

Continued from the previous page

 

 

CLUTCH  7C-45 

2.  CLUTCH DOES NOT RELEASE PROPERLY 

 

Checkpoint   Problem   

Countermeasure 

 
 

 

Adjust the push rod play 

 

 

Too much push rod play in the 

master cylinder 

 

NG 

 

Clutch pedal free play 

 

Driven plate 

 

 

Replace the driven plate 

 

 

Driven plate warped or 

unevenly worn 

 

 

Hydraulic circuit 

 

 

Bleed the hydraulic circuit 

 

 

Air in the hydraulic circuit 

 

OK 

NG 

NG 

OK 

Clean or repair the top gear 

shaft spline  

Replace the top gear shaft 

 

Corrosion or step wear on the 

top gear shaft spline 

 

 

Pressure plate 

 

 

Replace the pressure plate 

assembly 

 

 

Clean and grease the splined 

contact surface 

 

 

Pressure plate unevenly worn 

 

Insufficient grease on the 

spline contact surface of the 

splined hub 

OK 

NG 

NG 

NG 

OK 

Continued on the next page