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Figure 1. Typical Chassis Configuration
EXHAUST PORT
6. TROUBLE SHOOTING GUIDE
PROBLEM
Air springs flat
Air Springs raise to full height but do not exhaust
Air springs deflate when parked
Suspension will not maintain proper height
Hard ride
Cab suspension overshoots center
7. HCV TEST PROCEDURE
7.1
With a minimum of 90 psi at the supply port, rotate the
lever up (as indicated on the side of the valve) 30
°
45
. Air should begin to flow into the air springs within
seconds.
7.2
Rotate the lever to the neutral position. Air flow should
stop.
7.3
Rotate the lever down 30
exhaust from the air springs within seconds.
TO AIR SPRINGS
AIR SUPPLY
EXHAUST
°
to 45°. Air should begin to
Figure 2. Typical Cab Configuration
FILL
POSSIBLE CAUSE
Obstruction in air line
Insufficient air pressure to suspension
Defective Pressure Protection Valve
Defective HCV-see test procedure
Air leak in system
Obstructed air line
Defective HCV-see test procedure
Leak in air system-check with soapy water
Defective HCV-see test procedure
Obstructed air line
Defective HCV-see test procedure
Ride height out of adjustment-readjust per vehicle
service manual
Replace shocks
Use short delay H00450 HCV
7.4
Rotate the lever to the neutral position. Air flow should
stop.
°
to
7.5
If the valve fails to flow air or shut off as specified, re-
place with a new one.
8. REASONS TO REPLACE THE HCV
8.1
HCV did not pass the test procedure
•
Air leaks from the HCV
•
HCV is damaged
•
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