operators_manual

WARNING
If a different air dryer brand or model is
installed on the vehicle other than
what was originally installed, it could
cause the air system to not perform
correctly unless the full air system de-
sign is reviewed and modifications
made to comply with Federal Motor
Vehicle Safety Standards (FMVSS)
121 AirBrake 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 in-
jury.
WARNING
If the supply and service air tanks are
not drained at the recommended fre-
quency, water could enter the air lines
and valves. This could cause corrosion
or blockage, which could compromise
the brake system safety and potential-
ly 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.
Air Dryer Maintenance
The function of the air dryer is to collect
and remove air system contaminants in
solid, liquid and vapor form before they
enter the brake system. It provides clean,
dry air to the components of the brake
system, which increases the life of the
system and reduces maintenance costs.
MAINTENANCE - Air Dryer Maintenance
Y53-6047-2HEN (03/18) 209
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