BENDIX AD-9 Dati di servizio - Pagina 14
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SYMPTOMS
1. Dryer is constantly
cycling or purging.
14
AD-9 AIR DRYER TROUBLESHOOTING CHART
CAUSE
A. Excessive system
leakage.
B. Excessive leakage in
fitting, hoses and tubing
connected to the
compressor, air dryer
and first reservoir.
C. Defective check valve
assembly in AD-9 air
dryer end cover.
D. Defective governor.
E. Leaking purge valve
housing assembly and/or
o-rings in AD-9 air dryer
end cover.
F. Compressor unloader
mechanism leaking
excessively.
G. Holset E type
compressor.
H. Rapid cycling of the
governor due to air
starvation at the RES
port of the governor.
REMEDY
A. Test for excessive system leakage.
Allowable leakage:
Pre-121 vehicles, single vehicles - 2 psi/
minute.
Tractor trailer - 3 psi/minute.
121 vehicles, single vehicle - 1 psi/minute per
service reservoir.
Tractor trailer - 3 psi/minute per service
reservoir.
B. Using soap solution, test for leakage at fittings,
drain valve (if any) and safety valve in first
reservoir. Repair or replace as necessary.
C. Remove check valve assembly from end cover.
Subject air pressure to delivery side of valve.
Apply soap solution at opposite end and check
for leakage. (Permissible leakage - 1 inch bubble
in five seconds) If excessive leakage, replace
check valve assembly.
D. Test governor for proper cut-in and cut-out
pressures and excessive leakage in both
positions.
E. 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 inch bubble
in five seconds.
F. Remove air strainer or fitting from compressor
inlet cavity. With compressor unloaded, check
for unloader piston leakage. Slight leakage
permissible.
G. Test Air Dryer system using Bendix Product
Bulletin PRO-08-19 entitled Troubleshooting The
Holset E compressor system With Bendix Air
Dryer.
H. 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.