BENDIX AD-2 AIR DRYER Manual - Página 15
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SYMPTOM
1. Dryer is constantly
"cycling" or purging.
2. Water in vehicle
reservoirs.
3. Safety valve on air dryer
"popping off" or
exhausting air.
AD-2
™
AIR DRYER TROUBLESHOOTING CHART
CAUSE
A.
Excessive system leakage.
B.
Excessive leakage in fittings, hoses
and tubing connected to compressor,
air dryer and first reservoir.
C.
Defective check valve between air dryer
and first reservoir. (In standard AD-2
air dryer, check valve to outlet port.)
D.
Defective governor.
E.
Leaking purge valve in air dryer end
cover (control side).
F.
Compressor unloader mechanism
leaking excessively.
A.
Desiccant requires replacement.
B.
Improper discharge line length or
improper line material.
C.
Air system charged from outside air
source (outside air not passing
through air dryer).
D.
Air dryer not purging (see Symptom
#5).
E.
Purge (air exhaust) time insufficient
due to excessive system leakage
(see causes for Symptom #1).
F.
Air dryer/vehicle application requires
additional purge volume.
G.
Air dryer not compatible with vehicle
air system requirement - (Improper air
dryer/vehicle application).
A.
Desiccant cartridge plugged or
saturated.
B.
Defective check valve between air
dryer outlet port and first reservoir. (in
™
standard AD-2
air dryer, check valve
in outlet port.)
C.
Defective fittings, hose or tubing
between air dryer and first reservoir.
REMEDY
A.
Test for excessive leakage and repair.
Allowable leakage:
Pre-121 vehicles, single vehicle - 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.
Test check valve. Leakage should not exceed
™
1" soap bubble in five seconds. It may be
necessary to remove check valve to test.
Repair or replace as necessary.
D.
Test governor for proper cut-in or cut-out
pressures and excessive leakage in both
positions.
E.
Remove end cover. Apply 120 psi at control
port. Soap both sides around purge valve to test
for control piston leakage.
(Permissible leakage - 1" bubble in 5 seconds.)+`
F.
Remove air strainer or fitting from compressor
inlet cavity. With compressor unloaded, check
for unloader piston leakage.
Slight leakage permissible.
A.
Replace desiccant cartridge.
B.
Minimum of six-foot metal tubing for
two-cylinder compressor; ten-foot for
one-cylinder compressor. Flex hose
can be substituted at ratio of 1-1/2' flex hose for
each 1' of metal.
C.
If system must have outside air fill provision,
outside air should pass through air dryer.
(Unused inlet on air dryer can be used.) Use of
this should be minimized.
D.
See cause and remedy for Symptom #5.)
E.
Check causes and remedies for Symptom #1.
F.
When compressor is loaded (compressing)
longer than 90 seconds during normal
operation, additional purge volume may be
needed. (Before proceeding, contact Bendix
representation for consultation.)
G.
Air dryer requires minimum purge time of 30
seconds. If compressor stays loaded longer
than 90 seconds and additional purge volume is
added, longer purge time is required. Air dryer
efficiency will decrease as compressor
loaded time increases beyond 120 seconds,
during normal operation of the vehicle. (This
limitation assumes a compressor of
approximately 12 CFM and engine operation at
1600-1900 RPM.) The air dryer will
accommodate occasional longer loaded times,
such as initial system build-up.
A.
Check compressor for excessive oil passing
and/or correct compressor installation. Repair
or replace as necessary.
Rebuild or replace cartridge.
B.
Test to determine if air is passing through
check valve. Repair or replace.
C.
Check to determine if air is reaching first
reservoir. Inspect for kinked tubing or hose.
Check for undrilled or restricted hose or tubing
fittings.
15