For 1990-2009 cars

Cause | Action
--- | ---
DEFINITION: The clutch does not engage completely after the pedal is released, after shifting gears, or the clutch slips during maximum engine loads, such as climbing hills or high vehicle speeds. Clutch slipping is identified by increase in engine RPM without increase in vehicle speed.

Review the Symptoms - Clutch and perform the necessary inspections.

Incorrect clutch pedal height |

1. Adjust the pedal stops.
2. Adjust the clutch start switch. Refer to Clutch Pedal Engine Start Switch Replacement .

Clutch cable return spring is broken or missing | Replace the spring. Refer to Clutch Lever Replacement .
Clutch pedal is binding or sticking | Clear away any items that may be contacting the pedal.
Clutch pedal bushings are seized or worn | Replace or repair the clutch pedal assembly. Refer to Clutch Pedal Replacement .
Clutch housing lever and cross shaft binding | Lubricate the cross shaft and bushings.
Clutch clevis pins or external linkage is seized or binding | Lubricate the pins and linkage.
Release bearing locknut loose | Adjust the release bearing length and tighten the locknut. Refer to Clutch Assembly Adjustment .
The clutch cable is binding or seized | Replace the clutch cable. Refer to Clutch Cable Replacement .
The clutch cable is kinked or damaged | Replace the clutch cable. Refer to Clutch Cable Replacement .
Grease or oil contamination of the clutch disc |

1. Repair the source of the oil leak.
2. Repair the source of the grease leak.
3. Clean the contamination from the clutch components.
4. If contaminates cannot be removed, replace the clutch assembly. Refer to Clutch Assembly Replacement .

Worn or damaged flywheel | Replace the engine flywheel. Refer to Engine Flywheel Replacement in Engine Mechanical - 8.1L or refer to the Caterpillar engine service manual.
Worn clutch discs facing | Replace the clutch assembly. Refer to Clutch Assembly Replacement .
Burnt or glazed clutch discs | Replace the clutch assembly. Refer to Clutch Assembly Replacement .
Input shaft splines worn | Replace the input shaft. Refer to the transmission manufacturer service manual.