SAF-HOLLAND XL-AR363-02 EDL/ARF Feature - Manual (Page 8)

Disengaged Application
EDL Flipper plates up (disengaged) and vehicle is in
motion
(FIGURE 14) .
When the parking brakes are disengaged, the flipper plates will be up
and the primary height control valve (HCV) has full function. The
primary HCV fills the air springs through its center port and exhausts
the air springs through the top port of the auto reset (sensor) valve
(FIGURE 15).
XL-AR363-02 Rev. D 8
OPERATION
continued
FIGURE 14
EDL
Disengaged
Flipper Plate
Disengaged
(Up Position)
N.C. Port
Cylinder
Port
N.O.
Port
Exhaust To
Atmosphere
Pilot (Top)
Port to
Emergency
Brake Line
Exhaust
Air Spring
Air
Reservoir
Air Spring
Pressure Protection Valve
Minimum of 75 psig (5.2 bars) to allow
Air to Flow through Valve
Primary
Height
Control
Valve
Auto
Reset
(Sensor)
Valve
Air Spring
Air Spring
One-Way
Check
Valve
EDL Flipper Plate
Disengaged (Up) Position
Pilot
Valve
EDL
Actuator
FIGURE 15
EDL/ARF Piping Diagram with Flipper Plates Disengaged (up position)
Engaged Application
EDL Flipper plates down (engaged) and vehicle is
parked
1. Releasing air pressure from the trailer brake system or
disconnecting the glad hand engages the parking brakes.
2. System pressure to the “pilot port” of the pilot valve is cut off.
3. The normally closed (N.C.) port of the pilot valve closes, cutting off
system pressure.
4. The normally open (N.O.) port of the pilot valve opens, providing
an exhaust port for the air between the pilot valve and the EDL
actuator and sensor valve to escape.
5. The HCV maintains the ride height.
6. The EDL actuator push rod retracts, rotating the EDL rod assembly
so the flipper plates are down—in the engaged position.
7. If the suspension is at the correct ride height, the bottom edge of the
flipper plates must be 5/8˝ above the beam load pads.
Do not operate vehicle (put in motion)
if flipper plates are trapped in the
down position and the ARF does not function. Trailer and
suspension component damage could result. Refer to
EDL/ARF System Troubleshooting on page 14.
FIGURE 16
EDL Engaged
Flipper Plate
Engaged
(Down
Position)