Navistar WorkStar Series, Operator'S Manual

Page: 154 / 258

Operation
Lift Axle Controls
The lift axle system controls consist of all the controls, regulators,
and gauges needed to raise and lower the lift axle(s) and to
monitor the load air bag pressures for each axle. These controls
are available in three possible configurations and are the same
for all configurations. The three configurations are “Instrument
Panel”, “In-cab”, and “Mixed” controls. These are the same for
both lift axle types. The system controls are as follows:
1. The one AXLE ENABLE system switch, which is used to
activate all of the controls for any lift axles that are installed
on the vehicle (NOTE: The ignition switch must be in the ON
or RUN position).
2. The UP/DOWN switch is used to raise and lower the lift axle
(one control for each lift axle installed).
3. The Air Pressure Regulator is used to control the amount
of air pressure supplied to the load air bag for the lift axle
(one regulator for each lift axle installed).
4. The Air Pressure Gauge indicates the air pressure in the
load air bags for the lift axle (one gauge per lift axle installed
for in-cab control arrangement; two gauges per lift axle
installed for mixed control arrangement).
NOTE: When lift axle switches are installed in the instrument
panel, the Air Pressure Gauge and Air Pressure Regulators are
located outside of the cab, as shown in the “Mixed Controls”
configuration.
Instrument Panel Controls
1. Optional Location For Lift Axle Switches
142
3879634R1