This door latch secures the cab door in the closed position by engaging the striker plate mounted on the door frame. It is part of the door-locking system and is operated by the interior or exterior handle mechanism. When the latch wears or the internal spring loses tension, the door may not close fully or may rattle during operation. As an original-manufacturer component, it is built to the same engagement geometry and spring rate as the assembly it replaces, so no adjustment of the striker position is needed on installation.