BENDIX AD-IP INTEGRAL PURGE AIR DRYER Manual page 27

1. Discharge plugged or restricted
• Connect temporary discharge line from comp. discharge port
to supply res. & re-check build-up. If build-up OK replace
plugged discharge line. If build-up NOT OK go to next cause.
2. Air pressure trapped between governor and compressor
• Verify safety valve operation then remove or disconnect
governor from compressor & check build-up.
• If build-up OK, repair or replace governor or line between governor
and compressor.
• If build-up NOT OK repair or replace compressor.
3. Blow Leakage at Air Dryer Exhaust
• Drain all air from supply reservoir then remove control air line
from air dryer, plug line and plug control port in air dryer. Re-
check build-up.
• If build-up OK, repair or replace governor or line between
governor and air dryer.
• If build-up NOT OK, and below 32 deg. F, turn ignition ON and
allow heater to warm air dryer then check build-up. If NOT OK,
remove wire (connector or terminal) from air dryer. Using test
light, check wire end or terminal for battery voltage with vehicle
ignition ON. If voltage OK, repair or replace air dryer heater
and thermostat. If voltage NOT OK, repair or replace the
vehicle wire connected to air dryer. Retest build-up.
IMPORTANT: The Complaints, Causes and Remedies presented here should not be considered as the only situations possible.
They are only meant to represent the most commonly encountered. It may be necessary to perform additional trouble shooting using
the more detailed information presented in service manuals for the specific components.
TESTS COMMON TO MORE THAN ONE COMPLAINT
• If build-up still NOT OK or temp. above 32 deg. F, replace air
dryer purge valve assembly.
4. Air system leakage
• Build system pressure to governor cut-out, wait 2 minutes for
dryer purge completion. Note pressures on dash gauges
then watch dash gauges for 2 minutes. Leakage not to
exceed 2 psi in 2 mins. for truck, bus, tractor (no trailer).
• If leakage NOT OK on gauges, find leak(s) in service and park
system and repair. Retest and if system purge air dryer in use
and still not OK repair or replace dryer.
• If leakage OK on gauges, drain air from supply reservoir,
remove drain cock and install air gauge. Build system air in
supply reservoir and note leakage. If OK continue checking.
If NOT OK find leaks and repair.
5. Discharge line leakage
• Soap cover on flex discharge line, if leakage noted replace
line.
• Soap fittings to check leakage, tighten as needed.
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