by Nathan Fisher
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By synchronizing the rotational speed between the engine and transmission, a clutch works by applying pressure against the flywheel of the engine and the input shaft of the transmission. Over time, as the clutch is continually subjected to repeated engagement cycles, wear occurs on the internal surfaces, causing play or play in the mechanism. When operating heavy equipment that weighs several tons, such as the Caterpillar D4 excavator, you must keep the clutch in the proper setting to prevent premature wear.
Remove the cover from the clutch housing, located on the bottom of the excavator, with a socket wrench.
Locate the single 1/2-inch bolt that secures the center of the spider gear assembly. Loosen the nut on the bolt with a wrench.
Attach a torque wrench to break or loosen at 30 foot-pounds of torque. Place the torque wrench on the clutch lever fixing bolt, connecting the spider gear to the clutch pedal.
Tighten the spider bolt with a wrench, a quarter turn at a time. Test the pressure on the clutch lever with the torque wrench after every quarter turn of the spider bolt, until the torque wrench breaks at the 30 foot-pound setting.
Tighten the spider bolt locking nut and replace the clutch housing cover with the wrenches.
- Tractor Data: Caterpillar D4
- Repair of heavy equipment; Herbert Nichols and Helen Schwagerman
- Ih-202 International Combine Workshop Manual; Clymer Publications
Things you will need
- Pipe wrenches
- Torque wrench