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   3907431 Camshaft Gear   3911331 Injector Pump Gear   3918673 Timing Gear Housing Cover Gasket   3918675 Gear Cover   3931382 P-Pump Gear   Used 3955153 HPFP Gear   3960061 Gear Housing Gasket   3960623 Gear Housing   5267784 Gear Housing   Used 5291204 HPFP Gear   Used Ford 6.4 HPFP Sprocket
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