Service manual

16
solution to air dryer purge exhaust and purge
control port (where the control line was
removed). Leakage should not exceed a 1"
bubble in 5 seconds. If leakage is excessive
repair or replace purge valve assembly.
6. With gauge installed at RES port of governor,
pressure should not drop below “Cut-In” pressure
at the onset of the compressor “Unloaded”
cycle. If pressure drops, check for “kinks” or
restrictions in line connected to RES port. Line
connected to RES port on governor must be
same diameter, or preferably larger than, lines
connected to UNL port(s) on governor.
B. With the supply port open to atmosphere, apply
120 psi at the control port. Apply a soap solution
to the supply port and exhaust port (purge valve
seat area). Permissible leakage - 1" bubble in 5
seconds.
C. Test the Holset E Compressor unloader system
with feedback line and check valve for proper
operation. Make certain Holset ECON is not in
use with the drop-in version of the air dryer, if so,
remove and retest.
When installing a Bendix Drop-In air dryer in a
system equipped with a Holset E or QE
compressor, remove the Holset ECON valve along
with its feed back and governor control line.
AD-9
™
AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS CAUSE
REMEDY
B. Leaking purge valve
housing assembly and/or
o-rings in AD-9
™
air dryer
end cover.
C. Holset “E” type
compressor.
Typical Drop-In Air Dryer End Cover
Check Valve
Feed Back Line
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