8
Introduction
Each method has its own specifi c hardware requirement and installation.
A. Automatic Lift Axle with Manual Override Switch (No spring brake delivery line pressure switch used).
Kit number 400 612 040 0.
This confi guration allows the lift axle to automatically raise and lower based upon values put into TOOLBOX
PLUS™ Software which are downloaded into the ECU when it is programmed. This confi guration has a
trailer-mounted manual override switch that allows the driver to disable the ECU controlled raise/lower
function and keep the lift axle in the down position. This allows the driver to keep the trailer in compliance
where local ordinances require all lift axles to be kept in the down position regardless of load carried. Refer
to Figure 1 for the Manual Override Switch option.
B. Automated Lift Axle with Automatic Override (Spring brake delivery line pressure switch required).
Kit number 400 612 039 0.
This confi guration allows the lift axle to automatically raise and lower based upon values put into TOOLBOX
PLUS™ Software which are downloaded into the ECU when it is programmed. This confi guration allows
the driver to lower the lifted axle when parked by pulling the red dash valve in the tractor to remove trailer
supply air. This feature is useful for slider positioning or fast loading operations to ensure that the lift axle
is in the down position. Specifi cally, when the delivery line from the trailer spring brake chamber meets
or drops below 70 psi (4.82 bar), the ECU will automatically lower the lift axle. Refer to Figure 2 for the
Automatic Override Switch option.
C. Automated Lift Axle with Both Manual and Automatic Override. Kit number 400 612 041 0.
This confi guration allows the driver to lower the lifted axle by means of a toggle switch or by pulling the red
dash valve in the tractor to remove trailer supply air when the vehicle is at rest. This requires the technician
to perform the installation instructions for both manual and automatic confi gurations outlined in Step 10.
Refer to Figure 3 for the installation diagram.
A lift axle can be lowered by removing power to the trailer.
4.2 Installation
WARNING
To prevent serious eye injury, always wear safe eye protection when you perform vehicle maintenance or
service.
WARNING
Remove all pressure from the air system before you disconnect any component. Pressurized air can
cause serious personal injury.
WARNING
Park the vehicle on a level surface. Block the wheels to prevent the vehicle from moving. Support the
vehicle with safety stands. Do not work under a vehicle supported only by jacks. Jacks can slip or fall
over. Serious personal injury and damage to components can result.
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