Clutch Maintenance
Checking the Clutch Adjustment
Reporting erratic clutch operation as soon as possible gives maintenance personnel a chance to inspect, lubricate, and adjust the clutch components. The driver can be aware of clutch wear by noticing the gradual decrease in the distance the clutch pedal moves before resistance is felt. A correctly adjusted clutch must have about 3/4 inch (19 mm) of travel at the top of its stroke before a stronger resistance can be felt. See Fig.. If the free pedal travel is less than this distance, have the clutch adjusted.
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Free Pedal
Fig. 1, Clutch Free Pedal Travel
The clutch pedal free travel should be checked and commented on daily in the driver's report.
See Group 25 of the 122SD and Coronado Workshop Manual for clutch adjustment procedures and specifications.
Notice: Operating the vehicle with incorrect free pedal could result in clutch damage.
Checking the Clutch Brake Operation
Clutch brake operation can be felt as an increased resistance as the clutch pedal approaches the bottom of its stroke. If the gears grind when shifting into first or reverse gear from neutral with the clutch pedal fully depressed, the clutch pedal is out of adjustment or the clutch brake is worn and needs to be replaced.
Adjusting the Clutch
Clutches have an internal adjustment and external linkage adjustment. See Group 25 of the 122SD and Coronado Workshop Manual for clutch adjustment procedures and specifications.
Lubricating the Clutch Release Bearing
On vehicles equipped with a greaseable release bearing, the release bearing should be lubricated at frequent intervals. See Group 25 of the 122SD and Coronado 132 Maintenance Manual for intervals and procedures.