User Manual

Table Of Contents
WARNING
Use of an air dryer brand or model that
dif
fers from what was originally instal-
led could cause the air system to not
perform correctly unless the full air
system design is reviewed and modifi-
cations are made to comply with Fed-
eral Motor Vehicle Safety Standard
(FMVSS) 121 Air Brake Systems. Fail-
ure to abide by this warning and main-
tain compliance with FMVSS 121
could cause loss of vehicle control and
may lead to serious personal injury or
death.
The AD-HF Series air dryer has
incorporated into its design various
components that have typically been
installed separately on the vehicle (see
below for components/areas affected):
Pressure protection valves
Safety valve
Solenoid valves and plumbing
Plumbing of the front and rear
service air tanks
Plumbing to accessory systems
These components are required to meet
the Federal Motor Vehicle Safety
Standards (FMVSS 121 - Air Brake
Systems). As the W
arning above states,
any other type of air dryer installed in the
place of an AD-HF Series will require
changes, modifications and/or additions to
your vehicle’s air system to maintain
compliance with FMVSS 121.
Air Tanks
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 property damage, per-
sonal injury, or death.
CAUTION
DO NOT use penetrating oil, alcohol,
brake
fluid, or wax-based oils in the air
system. These fluids may cause se-
vere damage to air system compo-
nents.
To eject moisture from the air system
tanks, pull the line that is connected to the
moisture ejection valve. Continue pulling
until the air comes out free of water
.
Daily
The supply and service air tanks, must be
drained on a daily basis. Operate air
devices daily to circulate lubricants within
the unit.
Periodically
Clean filter screens ahead of the valves by
removing the screens and soaking them in
MAINTENANCE - Air Tanks
208 Y53-6113-1A1 (11/20)
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