operators_manual

WARNING!
Completely bypassing a Bendix
®
ADIS air
dryer will bypass the system’s pressure pro-
tection valves. This could lead to loss of air
pressure or damage to the vehicle’s air sys-
tem, which could cause an accident involv-
ing death or personal injury. Always adhere
to the manufacturer’s procedure if it is nec-
essary in an emergency to temporarily by-
pass an ADIS series air dryer. Failure to
comply may result in death, personal injury,
equipment or property damage.
WARNING!
If a different air dryer brand or model is in-
stalled on the vehicle other than what was
originally installed, it could cause the air
system to not perform correctly unless the
full air system design is reviewed and modi-
fications made to comply with Federal Motor
Vehicle Safety Standards (FMVSS) 121 Air-
Brake Systems. Failure to abide by this
warning and maintain compliance to FMVSS
121 could cause loss of vehicle control and
may lead to death or serious personal injury.
WARNING!
If the supply and service air tanks are not
drained at the recommended frequency, wa-
ter could enter the air lines and valves. This
could cause corrosion or blockage, which
could compromise the brake system safety
and potentially cause an accident. Failure to
comply may result in death, personal injury,
equipment or property damage.
Your vehicle’s compressor takes outside air
and compresses it, usually to 100-120 psi
(689-827 kPa). The compressed air then
goes to the reservoirs to be stored until
needed. When you operate your air
brakes, the stored compressed air flows
into the chambers where it is used to apply
your truck and trailer brakes. That is why,
when you push down on your brake pedal,
you don’t feel the same amount of
pressure on the pedal that you do when
you apply the brakes on your car. All you
are doing on your truck is opening an air
valve to allow air to flow into the brake
chambers. Contamination of the air supply
system is the major cause of problems in
air-operated components such as brake
valves, and suspension height control
valves. To keep contaminants to the lowest
possible level, follow these maintenance
procedures.
Daily Checks
• Drain moisture from the supply and
service air tanks.
• Operate air devices to circulate
lubricants within the unit.
Periodically
• Clean filter screens ahead of the
valves by removing the screens and
soaking them in solvent. Blow them
dry with pressurized air before
reinstalling them.
Twice a Year
• Maintain the air compressor to
prevent excessive oil by-pass. See
your maintenance manual for
details.
• Replace worn seals in valves and
air motors as they are needed.
What is an Air Dryer?
The function of the air dryer is to collect
and remove air system contaminants in
solid, liquid and vapor form before they
MAINTENANCE - What is an Air Dryer?
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