Section 554.413  Axle Suspension for Overweight Moves

a)         Truck-tractor drive tandem:  

The suspension system on the drive tandem must be designed to distribute a relatively equal amount of weight to each axle at various loadings.  A maximum differential of 2000 pounds between the heaviest and lightest axle is allowed for axles that exceed 20,000 pounds. (See Section 15-111 of the Code.)

b)         Semitrailers with three or more axles:  

The suspension system must be designed to distribute a relatively equal amount of weight to each axle at various loadings.  A maximum differential of 3000 pounds between the heaviest and lightest axles in a group is allowed.

(Source:  Amended at 36 Ill. Reg. 13254, effective August 1, 2012)