Cummins engines have many gears. These engines didn't have timing belts or chains, they had gears. A gear on the crank, camshaft diesel pump And hydraulic pump. The gears are what sets the timing for the engine. In general, they are all just press-fit, but some also have keys. Normally they all last a long time, but sometimes they do go bad.
Here are the gears:
 3900633 Gear Housing Bolt
 3901258 Crankshaft Gear
 3903794 Gear Housing Cover
 3904483 Dowel Pin
 3907431 Camshaft Gear
 3907803 Crankshaft with Gear
 3911331 Injector Pump Gear
 3914385 Timing Gear Housing Cover Gasket
 3918673 Timing Gear Housing Cover Gasket
 3918675 Gear Cover
 3918776 Crankshaft Gear
 3924962 Screw
 3931382 P-Pump Gear
 Used 3955153 HPFP Gear
 3960061 Gear Housing Gasket
 3960623 Gear Housing
 4991307 Gear Cover
 5267784 Gear Housing
 Used 5291204 HPFP Gear
 Used Ford 6.4 HPFP Sprocket
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