Do you know where to get help w/lift axles? Try eLearning and Guru.
- Gary Hey
- 5 days ago
- 2 min read
Did you know mounting TRACTOR pusher/tags are only allowed at factories, given RSD (Reduced Stopping Distance)? This is because the ABS - ESP/ESC is designed in conjunction with the lift axle. The system can’t be reprogramed once it's built.
Straight trucks don’t have this requirement, thus lift axles can be added anytime with any quantity.
The 1st axle (located next to the drive axle) must be >96” from the rear rear drive axle, or it carries 0 lbs. Tandem definition (40" - 96") and are rated 34K federal and most state bridge formulas. With 3 axles at 96”, 34K remains the requirement.
With 56" axle suspensions spacing (1" increment) must locate the lift at 41" min. 55" is 42". 54" is 43". 52" is 45". All equal 97" measured from the rear rear axle.
Given most all <13K pushers are lightly loaded, the others can be located as close as possible. Rule of thumb is 3” between tires. Seems some DOT inspectors require 40” for these axles, but that’s not the regulation. Some officers assumes the tandem definition is part of the equation, which it’s not. We recommend Vocational experts copy a bridge calculation document for each chassis and put it in the glove box. You have a calculator?
Adding the LQ-5 Bendix valve reduces brake pressure to the pusher/tag (<40 PSI). With the light ground load, they tend to flat spot tires.
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