SAF-HOLLAND XL-AR363-02 EDL/ARF Feature - Manual (Page 12)

XL-AR363-02 Rev. D 12
MAINTENANCE
continued
Primary Height Control Valve Information
Height Control Valve Performance Check
IMPORTANT:
Proper inspection can eliminate unnecessary
replacement of height control valve.
NOTE:
Apply air system pressure in excess of 85 psig
(5.9 bars) before doing performance check.
1. Disconnect the link assembly from height control valve arm.
2. Move control arm up 45˚ for 10-15 seconds – air should flow to air
springs (FIGURE 25).
3. Move control arm to center (neutral) position – valve should shut
off air flow to air springs.
4. Move control arm down 45˚ for 10-15 seconds (FIGURE 25) - air
should flow from air springs into center port of height control valve
and exhaust out the top port of the auto reset (sensor) valve.
5. Move control arm to center (neutral) position – valve should shut
off air flow.
6. Valve is good if performance is as noted.
7. Reconnect upper link assembly to control arm.
Central
(Neutral)
Position
Intake
Up 45˚
Exhaust
Down 45˚
FIGURE 25
Height Control Valve Performance Check
NOTE:
If valve does not perform correctly, refer to the
adjustment procedures on page 13.
Pilot Valve Check for EDL/ARF System
Pilot Valve Performance Check
NOTE:
Apply air system pressure in excess of 85 psig (5.9 bars)
before doing performance check.
1. When air from emergency brakes is present on top port of pilot
valve air should flow from N.C. port to cylinder port (FIGURE 26).
2. When emergency spring brakes are released (no air to top port of
pilot valve, air should exhaust (quickly) from EDL actuator out of
N.O. port (FIGURE 26).
FIGURE 26
Pilot Valve Check
Pilot Port to
Emergency
Brake Line
N.C. Port
N.O. Port
Exhaust to
Atmosphere
Cylinder Port
Pilot Valve