Navistar International Transportation Corporation

Charles D Sims

Michael J Lehman

David A Schaller

Anthony J Kraft

William R Heign

A driver-controlled differential lock control system allows vehicles with automatic, electronic and single range manual transmissions and air pressure actuated differential locking devices to have the vehicle differential thereof locked on only at low speeds. The control system includes a vehicle speed sensor, such as a speedometer transmitter, and a speed switch responsive to the vehicle speed sensor to selectively actuate a normally-closed air solenoid valve disposed in a vehicle air supply line upstream of a manually controlled air valve which supplies the differential lock actuator. The speed switch normally supplies power to the air solenoid valve until the speed of the vehicle exceeds a predefined limit whereat power is discontinued to the air solenoid valve causing disengagement of the differential lock.

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Columbia City, IN, United States of America

Charles D Sims