22
Introduction
4. Adjust pressure regulator attached to the pressure sensor to 15 psi.
5. Adjust pressure regulator attached to the pressure switch to 90 psi.
6. Increase the air pressure to the pressure sensor to a psi level above the lift axle’s stated lowering
pressure. The lift bags should defl ate and the axle should lower.
7. Decrease the air pressure to the pressure sensor to a psi level below the lift axle’s stated raising
pressure. The lift bags should infl ate and the axle should rise.
8. Decrease the air pressure to the pressure switch to a level below 70 psi. The lift bags should defl ate and
the axle should lower.
9. Increase air pressure to the pressure switch to a level above 70 psi. The lift bags should infl ate and the
axle should rise.
10. The test has been completed. Remove the connections to the test rig, and re-attach the connections on
the trailer‘s pressure sensor and pressure switch.
4.4.3 Using the Lift Axle Test Rig — Manual Override
Prior to beginning the test, the WABCO ABS with Lift Axle Control must be installed and have
successfully completed the End of Line test. Do not proceed without accomplishing this fi rst.
1. Attach shop air to lift axle test rig “tee” fi tting.
2. Connect the test rig‘s pressure sensor to the pressure sensor cable which is plugged into port 1 of the
HUB cable plugged into GIO 1, or directly plugged into GIO 1 (if the optional lift axle indicator light is not
used).
3. Adjust pressure regulator attached to the pressure sensor to 15 psi.
4. Ensure the manual override switch is in the deactivated (OFF) position.
5. Increase the air pressure to the pressure sensor to a psi level above the lift axle’s stated lowering
pressure. The lift bags should defl ate and the axle should lower.
6. Decrease the air pressure to the pressure sensor to a psi level below the lift axle’s stated raising
pressure. The lift bags should infl ate and the axle should rise.
7. Activate the manual override switch (switch to the ON position). The lift bags should defl ate and the axle
should lower.
8. Deactivate the manual override switch (switch to the OFF position). The lift bags should infl ate and the
axle should rise.
9. The test has been completed. Remove the connections to the test rig, and re-attach the connections on
the trailer‘s pressure sensor and pressure switch.
4.4.4 Lift Axle Label
The lifting and lowering pressures will be clearly written with indelible ink on label TP09174. This label will
be affi xed near the lift axle on the trailer body by the trailer’s original equipment manufacturer. Figure 16.
To Next Page
Loading...
