MACK issued a recall on the RD600 model

VEHICLES EQUIPPED WITH A SHEPPARD 392S MASTER STEERING GEAR AND 292 SLAVE GEAR, 20,000 POUND FRONT AXLE, AND A 34.5 INCH SPRING CENTRE CAN EXPERIENCE COMPRESSION OF THE FRONT SPRINGS TO AN EXTENT THAT WOULD CAUSE AN INTERFERENCE WITH THE 90 DEGREE CROSSOVER FITTINGS ON THE BOTTOM OF THE GEARS. IF ONE OF THE FITTINGS WERE TO BREAK, LOSS OF HYDRAULIC FLUID WOULD CAUSE LOSS OF POWER STEERING WITH POSSIBLE LOSS OF CONTROL AND A VEHICLE CRASH. CORRECTION: EXISTING CENTRE PORT STEERING GEAR CYLINDER HEADS WILL BE REPLACED WITH NEW SIDE PORT CYLINDER HEADS IN ADDITION TO THE INSTALLATION OF THICKER BUMPER STOPS TO ELIMINATE SPRING GEAR CONTACT.