AIR SYSTEM PREVENTIVE MAINTENANCE
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Regional Haul (R05/10)
condensation. Under these conditions, the presence
of small amounts of moisture is normal and should not
be considered as an indication that the dryer is not
performing properly.
• An outside air source may have been used to charge
the air system, in which case this air did not pass
through the drying bed.
Air Intake System
Engine heat, vibration, and age combine to loosen air
intake connections and cause cracks in the tubing and
elbows. Leaks in the intake system allow abrasive dust to
enter the engine and quickly cause expensive damage.
During your daily walk-around inspection, carefully check
all tubing, elbows, clamps supports and fasteners for con-
dition and tightness.
• Under normal operating conditions, Peterbilt recom-
mends complete disassembly and cleaning of the air
intake system at each 25,000 mile (40,000 km).
Under severe operating conditions, the disassembly
and cleaning should be more frequent. Replace any
defective parts. With the possible exception of mount-
ing brackets, do not repair defective parts.
• Check the Charge-Air-Cooler for air leaks annually.
The air leaks can be caused by cracked tubes or
header. For service see your Peterbilt Dealer or
Authorized Service Center.
Turbocharger
When servicing the air intake and exhaust systems on a
turbocharged engine, check the items listed below.
WARNING! Do not operate engine with the tur-
bocharger intake piping disconnected. A suc-
tion is created when the engine is running.
This suction could draw your hand or any-
thing else near it into the impeller fan. You
could be killed or seriously injured. Always
keep the intake piping connected when you
will be running the engine.
Lubricating System: Check the oil lines, housing, and
connections. Look for leaks, damage, or deterioration.
Leaks could mean you have damaged oil lines or oil seals.
Manifold: With the engine operating, check for leaking
manifold or flange gaskets.
