Crank kit for the wiper motor (Part 90035796) It’s the crank / linkage kit associated with the wiper motor assembly, used to convert the wiper motor’s rotational motion into the back and forth sweep that drives the windshield wiper arms. This part is essential for maintaining proper windshield wiping action on terminal tractors and yard trucks. Part of the windshield wiper assembly, typically mounted on the wiper motor’s output shaft.