PART 8: MAINTENANCE AND SERVICE YOUR VEHICLE’S AIR SYSTEM
(R10/06) Y53-6007 – 169 –
Air Supply System
WARNING! Do not operate the vehicle if leakage
in the air system is detected. Conduct the follow-
ing procedure and contact an authorized Peter-
bilt Dealer (or any other properly equipped
service center) if a leak is detected. Failure to
check the brakes or follow these procedures
could cause a system failure, increasing the risk
of an injury accident.
Contamination of the air supply system is the major cause
of problems in air-operated components such as brake
valves, wiper motors, and suspension height control
valves. To keep contaminants to the lowest possible level,
follow these maintenance procedures.
WARNING! If the supply and service tanks are
not drained at the recommended frequency,
water could be sent to all air lines and valves.
This could cause corrosion, which could com
-
promise the brake system safety and potentially
cause an accident.
Daily
• 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
• Add approximately 1/4 oz. (7.5 ml) of light viscosity
lubricant to the air line leading to the wiper motor.
Acceptable lubricants are Dow Corning 200 fluid, 200
CS viscosity, and Sprague Wiper Lube. If you have
alcohol dryers installed in the air system, the alcohol
can wash away lubricants from the wiper motors.
CAUTION: Don’t use penetrating oil, brake fluid,
or wax-based oils in the air system. These fluids
may cause severe damage to air system compo
-
nents.
• Maintain the air compressor to prevent excessive oil
by-pass. See your shop manual for maintenance
details.
• Replace worn seals in valves and air motors as they
are needed.
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