Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
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Air System<br />
pressors. After completing any repairs to the air system,<br />
always test for air leaks, and check the brakes for safe operation<br />
before putting the vehicle in service.<br />
According to Table 5, “Air System Scheduled Maintenance,”<br />
Page 196:<br />
• Inspect compressor air filter element, if so equipped, and<br />
replace element if clogged. Check compressor mounting<br />
and drive for alignment and belt tension. Adjust if necessary.<br />
• Remove compressor discharge valve cap nuts and<br />
check for presence of excessive carbon. If excessive carbon<br />
is found, clean or replace the compressor cylinder<br />
head. Also, check compressor discharge line for carbon,<br />
and clean or replace the discharge line if necessary.<br />
• Disassemble compressor and thoroughly clean and<br />
inspect all parts. Repair or replace all worn or damaged<br />
parts, or replace compressor with a factory exchange<br />
unit.<br />
Preventive Maintenance<br />
CAUTION: When draining the engine cooling<br />
system is required, to prevent damage from<br />
freezing, the compressor must also be drained<br />
at the cylinder head and block. Engine damage<br />
could occur if the cooling system is not periodically<br />
drained and maintained. See “Engine Cooling<br />
System,” Page 178, and the <strong>Medium</strong> <strong>Duty</strong><br />
Maintenance <strong>Manual</strong> for further information.<br />
Air Dryer<br />
WARNING! Use of incorrect air dryer could<br />
cause air system failure, leading to loss of vehicle<br />
control and serious personal injury or death.<br />
If your vehicle is equipped with a Bendix AD-IS<br />
air dryer, it is important that future replacements<br />
be identical or similar in design.<br />
Any deviation from the Bendix AD-IS type air dryer would<br />
require changes to the vehicle air system. Some vehicles<br />
use a dual air system consisting of a wet tank, forward dry<br />
tank, and rear dry tank. The dry tanks have a single-check<br />
valve in the tank inlet. The check valves prevent a complete<br />
loss of air in the event of an air system failure (tank<br />
or hose failure). This ensures a controlled stop (with<br />
– 200 – Y53-6027 <strong>Medium</strong> <strong>Duty</strong> (R05/09)